Merge branch 'develop' of github.com:EllisLab/CodeIgniter into develop

38 files changed, 1976 insertions, 913 deletions

diff --git a/application/config/mimes.php b/application/config/mimes.php
index 2a68ce9e1..d69497a30 100644
--- a/application/config/mimes.php
+++ b/application/config/mimes.php
@@ -120,7 +120,7 @@ $mimes = array('hqx'	=>	array('application/mac-binhex40', 'application/mac-binhe
 				'mov'	=>	'video/quicktime',
 				'avi'	=>	array('video/x-msvideo', 'video/msvideo', 'video/avi', 'application/x-troff-msvideo'),
 				'movie'	=>	'video/x-sgi-movie',
-				'doc'	=>	'application/msword',
+				'doc'	=>	array('application/msword', 'application/vnd.ms-office'),
 				'docx'	=>	array('application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'application/zip'),
 				'xlsx'	=>	array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/zip'),
 				'word'	=>	array('application/msword', 'application/octet-stream'),
diff --git a/system/database/DB_active_rec.php b/system/database/DB_active_rec.php
index 424735157..eaae23f30 100644
--- a/system/database/DB_active_rec.php
+++ b/system/database/DB_active_rec.php
@@ -236,7 +236,8 @@ class CI_DB_active_record extends CI_DB_driver {
 	{
 		if (strpos($item, '.') !== FALSE)
 		{
-			return end(explode('.', $item));
+			$item = explode('.', $item);
+			return end($item);
 		}
 
 		return $item;
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index dca8e4733..e403efb9f 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -185,20 +185,19 @@ class CI_DB_driver {
 	/**
 	 * Set client character set
 	 *
-	 * @access	public
 	 * @param	string
 	 * @param	string
-	 * @return	resource
+	 * @return	bool
 	 */
-	function db_set_charset($charset, $collation)
+	public function db_set_charset($charset, $collation = '')
 	{
-		if ( ! $this->_db_set_charset($this->char_set, $this->dbcollat))
+		if (method_exists($this, '_db_set_charset') && ! $this->_db_set_charset($charset, $collation))
 		{
-			log_message('error', 'Unable to set database connection charset: '.$this->char_set);
+			log_message('error', 'Unable to set database connection charset: '.$charset);
 
 			if ($this->db_debug)
 			{
-				$this->display_error('db_unable_to_set_charset', $this->char_set);
+				$this->display_error('db_unable_to_set_charset', $charset);
 			}
 
 			return FALSE;
@@ -223,36 +222,40 @@ class CI_DB_driver {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Database Version Number.  Returns a string containing the
-	 * version of the database being used
+	 * Database version number
+	 *
+	 * Returns a string containing the version of the database being used.
+	 * Most drivers will override this method.
 	 *
-	 * @access	public
 	 * @return	string
 	 */
-	function version()
+	public function version()
 	{
-		if (FALSE === ($sql = $this->_version()))
+		if (isset($this->data_cache['version']))
 		{
-			if ($this->db_debug)
-			{
-				return $this->display_error('db_unsupported_function');
-			}
-			return FALSE;
+			return $this->data_cache['version'];
 		}
 
-		// Some DBs have functions that return the version, and don't run special
-		// SQL queries per se. In these instances, just return the result.
-		$driver_version_exceptions = array('oci8', 'sqlite', 'cubrid', 'pdo', 'mysqli');
-
-		if (in_array($this->dbdriver, $driver_version_exceptions))
-		{
-			return $sql;
-		}
-		else
+		if (FALSE === ($sql = $this->_version()))
 		{
-			$query = $this->query($sql);
-			return $query->row('ver');
+			return ($this->db_debug) ? $this->display_error('db_unsupported_function') : FALSE;
 		}
+
+		$query = $this->query($sql);
+		$query = $query->row();
+		return $this->data_cache['version'] = $query->ver;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Version number query string
+	 *
+	 * @return	string
+	 */
+	protected function _version()
+	{
+		return 'SELECT VERSION() AS ver';
 	}
 
 	// --------------------------------------------------------------------
@@ -331,30 +334,28 @@ class CI_DB_driver {
 			// This will trigger a rollback if transactions are being used
 			$this->_trans_status = FALSE;
 
-			// Grab the error number and message now, as we might run some
-			// additional queries before displaying the error
-			$error_no = $this->_error_number();
-			$error_msg = $this->_error_message();
+			// Grab the error now, as we might run some additional queries before displaying the error
+			$error = $this->error();
 
 			// Log errors
-			log_message('error', 'Query error: '.$error_msg);
+			log_message('error', 'Query error: '.$error['message']);
 
 			if ($this->db_debug)
 			{
 				// We call this function in order to roll-back queries
-				// if transactions are enabled.  If we don't call this here
+				// if transactions are enabled. If we don't call this here
 				// the error message will trigger an exit, causing the
 				// transactions to remain in limbo.
 				$this->trans_complete();
 
 				// Display errors
 				return $this->display_error(
-										array(
-												'Error Number: '.$error_no,
-												$error_msg,
-												$sql
-											)
-										);
+								array(
+									'Error Number: '.$error['code'],
+									$error['message'],
+									$sql
+								)
+							);
 			}
 
 			return FALSE;
@@ -645,17 +646,12 @@ class CI_DB_driver {
 	/**
 	 * Determines if a query is a "write" type.
 	 *
-	 * @access	public
 	 * @param	string	An SQL query string
-	 * @return	boolean
+	 * @return	bool
 	 */
-	function is_write_type($sql)
+	public function is_write_type($sql)
 	{
-		if ( ! preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD DATA|COPY|ALTER|GRANT|REVOKE|LOCK|UNLOCK)\s+/i', $sql))
-		{
-			return FALSE;
-		}
-		return TRUE;
+		return (bool) preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD DATA|COPY|ALTER|RENAME|GRANT|REVOKE|LOCK|UNLOCK|OPTIMIZE|REINDEX)\s+/i', $sql);
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/database/drivers/cubrid/cubrid_driver.php b/system/database/drivers/cubrid/cubrid_driver.php
index cde719eae..afdaef351 100644
--- a/system/database/drivers/cubrid/cubrid_driver.php
+++ b/system/database/drivers/cubrid/cubrid_driver.php
@@ -156,37 +156,15 @@ class CI_DB_cubrid_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Set client character set
+	 * Database version number
 	 *
-	 * @access	public
-	 * @param	string
-	 * @param	string
-	 * @return	resource
-	 */
-	function db_set_charset($charset, $collation)
-	{
-		// In CUBRID, there is no need to set charset or collation.
-		// This is why returning true will allow the application continue
-		// its normal process.
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Version number query string
-	 *
-	 * @access	public
 	 * @return	string
 	 */
-	function _version()
+	public function version()
 	{
-		// To obtain the CUBRID Server version, no need to run the SQL query.
-		// CUBRID PHP API provides a function to determin this value.
-		// This is why we also need to add 'cubrid' value to the list of
-		// $driver_version_exceptions array in DB_driver class in
-		// version() function.
-		return cubrid_get_server_info($this->conn_id);
+		return isset($this->data_cache['version'])
+			? $this->data_cache['version']
+			: $this->data_cache['version'] = cubrid_get_server_info($this->conn_id);
 	}
 
 	// --------------------------------------------------------------------
@@ -362,12 +340,11 @@ class CI_DB_cubrid_driver extends CI_DB {
 	/**
 	 * Affected Rows
 	 *
-	 * @access	public
-	 * @return	integer
+	 * @return	int
 	 */
-	function affected_rows()
+	public function affected_rows()
 	{
-		return @cubrid_affected_rows($this->conn_id);
+		return @cubrid_affected_rows();
 	}
 
 	// --------------------------------------------------------------------
@@ -472,31 +449,18 @@ class CI_DB_cubrid_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message string
+	 * Error
 	 *
-	 * @access	private
-	 * @return	string
-	 */
-	function _error_message()
-	{
-		return cubrid_error($this->conn_id);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * The error message number
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
 	 *
-	 * @access	private
-	 * @return	integer
+	 * @return	array
 	 */
-	function _error_number()
+	public function error()
 	{
-		return cubrid_errno($this->conn_id);
+		return array('code' => cubrid_errno($this->conn_id), 'message' => cubrid_error($this->conn_id));
 	}
 
-	// --------------------------------------------------------------------
-
 	/**
 	 * Escape the SQL Identifiers
 	 *
@@ -801,4 +765,4 @@ class CI_DB_cubrid_driver extends CI_DB {
 
 
 /* End of file cubrid_driver.php */
-/* Location: ./system/database/drivers/cubrid/cubrid_driver.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/cubrid/cubrid_driver.php */
diff --git a/system/database/drivers/interbase/index.html b/system/database/drivers/interbase/index.html
new file mode 100644
index 000000000..c942a79ce
--- /dev/null
+++ b/system/database/drivers/interbase/index.html
@@ -0,0 +1,10 @@
+<html>
+<head>
+	<title>403 Forbidden</title>
+</head>
+<body>
+
+<p>Directory access is forbidden.</p>
+
+</body>
+</html>
\ No newline at end of file
diff --git a/system/database/drivers/interbase/interbase_driver.php b/system/database/drivers/interbase/interbase_driver.php
new file mode 100644
index 000000000..f4bd9e271
--- /dev/null
+++ b/system/database/drivers/interbase/interbase_driver.php
@@ -0,0 +1,627 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 5.1.6 or newer
+ *
+ * NOTICE OF LICENSE
+ *
+ * Licensed under the Open Software License version 3.0
+ *
+ * This source file is subject to the Open Software License (OSL 3.0) that is
+ * bundled with this package in the files license.txt / license.rst.  It is
+ * also available through the world wide web at this URL:
+ * http://opensource.org/licenses/OSL-3.0
+ * If you did not receive a copy of the license and are unable to obtain it
+ * through the world wide web, please send an email to
+ * licensing@ellislab.com so we can send you a copy immediately.
+ *
+ * @package		CodeIgniter
+ * @author		EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
+ * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
+ * @link		http://codeigniter.com
+ * @since		Version 3.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Firebird/Interbase Database Adapter Class
+ *
+ * Note: _DB is an extender class that the app controller
+ * creates dynamically based on whether the active record
+ * class is being used or not.
+ *
+ * @package		CodeIgniter
+ * @subpackage	Drivers
+ * @category	Database
+ * @author		EllisLab Dev Team
+ * @link		http://codeigniter.com/user_guide/database/
+ */
+class CI_DB_interbase_driver extends CI_DB {
+
+	public $dbdriver = 'interbase';
+
+	// The character used to escape with
+	protected $_escape_char = '"';
+
+	// clause and character used for LIKE escape sequences
+	protected $_like_escape_str = " ESCAPE '%s' ";
+	protected $_like_escape_chr = '!';
+
+	/**
+	 * The syntax to count rows is slightly different across different
+	 * database engines, so this string appears in each driver and is
+	 * used for the count_all() and count_all_results() functions.
+	 */
+	protected $_count_string = "SELECT COUNT(*) AS ";
+	protected $_random_keyword = ' Random()'; // database specific random keyword
+
+	// Keeps track of the resource for the current transaction
+	protected $trans;
+
+	/**
+	 * Non-persistent database connection
+	 *
+	 * @return	resource
+	 */
+	public function db_connect()
+	{
+		return @ibase_connect($this->hostname.':'.$this->database, $this->username, $this->password, $this->char_set);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Persistent database connection
+	 *
+	 * @return	resource
+	 */
+	public function db_pconnect()
+	{
+		return @ibase_pconnect($this->hostname.':'.$this->database, $this->username, $this->password, $this->char_set);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Reconnect
+	 *
+	 * Keep / reestablish the db connection if no queries have been
+	 * sent for a length of time exceeding the server's idle timeout
+	 *
+	 * @return	void
+	 */
+	public function reconnect()
+	{
+		// not implemented in Interbase/Firebird
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Select the database
+	 *
+	 * @return	bool
+	 */
+	public function db_select()
+	{
+		// Connection selects the database
+		return TRUE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Database version number
+	 *
+	 * @return	string
+	 */
+	public function version()
+	{
+		if (isset($this->data_cache['version']))
+		{
+			return $this->data_cache['version'];
+		}
+
+		if (($service = ibase_service_attach($this->hostname, $this->username, $this->password)))
+		{
+			$this->data_cache['version'] = ibase_server_info($service, IBASE_SVC_SERVER_VERSION);
+
+			// Don't keep the service open
+			ibase_service_detach($service);
+			return $this->data_cache['version'];
+		}
+
+		return FALSE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Execute the query
+	 *
+	 * @param	string	an SQL query
+	 * @return	resource
+	 */
+	protected function _execute($sql)
+	{
+		$sql = $this->_prep_query($sql);
+		return @ibase_query($this->conn_id, $sql);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Prep the query
+	 *
+	 * If needed, each database adapter can prep the query string
+	 *
+	 * @param	string	an SQL query
+	 * @return	string
+	 */
+	protected function _prep_query($sql)
+	{
+		return $sql;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Begin Transaction
+	 *
+	 * @return	bool
+	 */
+	public function trans_begin($test_mode = FALSE)
+	{
+		if ( ! $this->trans_enabled)
+		{
+			return TRUE;
+		}
+
+		// When transactions are nested we only begin/commit/rollback the outermost ones
+		if ($this->_trans_depth > 0)
+		{
+			return TRUE;
+		}
+
+		// Reset the transaction failure flag.
+		// If the $test_mode flag is set to TRUE transactions will be rolled back
+		// even if the queries produce a successful result.
+		$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;
+
+		$this->trans = @ibase_trans($this->conn_id);
+
+		return TRUE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Commit Transaction
+	 *
+	 * @return	bool
+	 */
+	public function trans_commit()
+	{
+		if ( ! $this->trans_enabled)
+		{
+			return TRUE;
+		}
+
+		// When transactions are nested we only begin/commit/rollback the outermost ones
+		if ($this->_trans_depth > 0)
+		{
+			return TRUE;
+		}
+
+		return @ibase_commit($this->trans);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Rollback Transaction
+	 *
+	 * @return	bool
+	 */
+	public function trans_rollback()
+	{
+		if ( ! $this->trans_enabled)
+		{
+			return TRUE;
+		}
+
+		// When transactions are nested we only begin/commit/rollback the outermost ones
+		if ($this->_trans_depth > 0)
+		{
+			return TRUE;
+		}
+
+		return @ibase_rollback($this->trans);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Escape String
+	 *
+	 * @param	string
+	 * @param	bool	whether or not the string will be used in a LIKE condition
+	 * @return	string
+	 */
+	public function escape_str($str, $like = FALSE)
+	{
+		if (is_array($str))
+		{
+			foreach ($str as $key => $val)
+			{
+				$str[$key] = $this->escape_str($val, $like);
+			}
+
+			return $str;
+		}
+
+		// escape LIKE condition wildcards
+		if ($like === TRUE)
+		{
+			$str = str_replace(	array('%', '_', $this->_like_escape_chr),
+								array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
+								$str);
+		}
+
+		return $str;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Affected Rows
+	 *
+	 * @return	integer
+	 */
+	public function affected_rows()
+	{
+		return @ibase_affected_rows($this->conn_id);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Insert ID
+	 *
+	 * @param	string $generator_name
+	 * @param	integer $inc_by
+	 * @return	integer
+	 */
+	public function insert_id($generator_name, $inc_by=0)
+	{
+		//If a generator hasn't been used before it will return 0
+		return ibase_gen_id('"'.$generator_name.'"', $inc_by);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * "Count All" query
+	 *
+	 * Generates a platform-specific query string that counts all records in
+	 * the specified database
+	 *
+	 * @param	string
+	 * @return	string
+	 */
+	public function count_all($table = '')
+	{
+		if ($table == '')
+		{
+			return 0;
+		}
+
+		$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows') . ' FROM ' . $this->_protect_identifiers($table, TRUE, NULL, FALSE));
+
+		if ($query->num_rows() == 0)
+		{
+			return 0;
+		}
+
+		$row = $query->row();
+		$this->_reset_select();
+		return (int) $row->numrows;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * List table query
+	 *
+	 * Generates a platform-specific query string so that the table names can be fetched
+	 *
+	 * @param	boolean
+	 * @return	string
+	 */
+	protected function _list_tables($prefix_limit = FALSE)
+	{
+		$sql = <<<SQL
+			SELECT "RDB\$RELATION_NAME" FROM "RDB\$RELATIONS" 
+			WHERE "RDB\$RELATION_NAME" NOT LIKE 'RDB$%'
+			AND "RDB\$RELATION_NAME" NOT LIKE 'MON$%'
+SQL;
+
+		if ($prefix_limit !== FALSE AND $this->dbprefix != '')
+		{
+			$sql .= ' AND "RDB$RELATION_NAME" LIKE \''.$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
+		}
+		return $sql;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Show column query
+	 *
+	 * Generates a platform-specific query string so that the column names can be fetched
+	 *
+	 * @param	string	the table name
+	 * @return	string
+	 */
+	protected function _list_columns($table = '')
+	{
+		return <<<SQL
+			SELECT "RDB\$FIELD_NAME" FROM "RDB\$RELATION_FIELDS" 
+			WHERE "RDB\$RELATION_NAME"='{$table}';
+SQL;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Field data query
+	 *
+	 * Generates a platform-specific query so that the column data can be retrieved
+	 *
+	 * @param	string	the table name
+	 * @return	object
+	 */
+	protected function _field_data($table)
+	{
+		// Need to find a more efficient way to do this
+		// but Interbase/Firebird seems to lack the
+		// limit clause
+		return "SELECT * FROM {$table}";
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Error
+	 *
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
+	 *
+	 * @return	array
+	 */
+	public function error()
+	{
+		return array('code' => ibase_errcode(), 'message' => ibase_errmsg());
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Escape the SQL Identifiers
+	 *
+	 * This public function escapes column and table names
+	 *
+	 * @param	string
+	 * @return	string
+	 */
+	protected function _escape_identifiers($item)
+	{
+		foreach ($this->_reserved_identifiers as $id)
+		{
+			if (strpos($item, '.'.$id) !== FALSE)
+			{
+				$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);
+
+				// remove duplicates if the user already included the escape
+				return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
+			}
+		}
+
+		if (strpos($item, '.') !== FALSE)
+		{
+			$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;
+		}
+		else
+		{
+			$str = $this->_escape_char.$item.$this->_escape_char;
+		}
+
+		// remove duplicates if the user already included the escape
+		return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * From Tables
+	 *
+	 * This public function implicitly groups FROM tables so there is no confusion
+	 * about operator precedence in harmony with SQL standards
+	 *
+	 * @param	type
+	 * @return	type
+	 */
+	protected function _from_tables($tables)
+	{
+		if ( ! is_array($tables))
+		{
+			$tables = array($tables);
+		}
+
+		//Interbase/Firebird doesn't like grouped tables
+		return implode(', ', $tables);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Insert statement
+	 *
+	 * Generates a platform-specific insert string from the supplied data
+	 *
+	 * @param	string	the table name
+	 * @param	array	the insert keys
+	 * @param	array	the insert values
+	 * @return	string
+	 */
+	protected function _insert($table, $keys, $values)
+	{
+		return "INSERT INTO {$table} (".implode(', ', $keys).') VALUES ('.implode(', ', $values).')';
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Update statement
+	 *
+	 * Generates a platform-specific update string from the supplied data
+	 *
+	 * @param	string	the table name
+	 * @param	array	the update data
+	 * @param	array	the where clause
+	 * @param	array	the orderby clause
+	 * @param	array	the limit clause
+	 * @return	string
+	 */
+	protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
+	{
+		foreach ($values as $key => $val)
+		{
+			$valstr[] = $key." = ".$val;
+		}
+
+		//$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
+
+		$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';
+
+		$sql = "UPDATE {$table} SET ".implode(', ', $valstr);
+
+		$sql .= ($where != '' AND count($where) >=1) ? ' WHERE '.implode(' ', $where) : '';
+
+		$sql .= $orderby;
+
+		return $sql;
+	}
+
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Truncate statement
+	 *
+	 * Generates a platform-specific truncate string from the supplied data
+	 * If the database does not support the truncate() command
+	 * This public function maps to "DELETE FROM table"
+	 *
+	 * @param	string	the table name
+	 * @return	string
+	 */
+	protected function _truncate($table)
+	{
+		return $this->_delete($table);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Delete statement
+	 *
+	 * Generates a platform-specific delete string from the supplied data
+	 *
+	 * @param	string	the table name
+	 * @param	array	the where clause
+	 * @param	string	the limit clause
+	 * @return	string
+	 */
+	protected function _delete($table, $where = array(), $like = array(), $limit = FALSE)
+	{
+		$conditions = '';
+
+		if (count($where) > 0 OR count($like) > 0)
+		{
+			$conditions = "\nWHERE ";
+			$conditions .= implode("\n", $this->ar_where);
+
+			if (count($where) > 0 && count($like) > 0)
+			{
+				$conditions .= ' AND ';
+			}
+			$conditions .= implode("\n", $like);
+		}
+
+		//$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
+
+		return "DELETE FROM {$table}{$conditions}";
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Limit string
+	 *
+	 * Generates a platform-specific LIMIT clause
+	 *
+	 * @param	string	the sql query string
+	 * @param	integer	the number of rows to limit the query to
+	 * @param	integer	the offset value
+	 * @return	string
+	 */
+	protected function _limit($sql, $limit, $offset)
+	{
+		// Keep the current sql string safe for a moment
+		$orig_sql = $sql;
+
+		// Limit clause depends on if Interbase or Firebird
+		if (stripos($this->version(), 'firebird') !== FALSE)
+		{
+			$sql = 'FIRST '. (int) $limit;
+
+			if ($offset > 0)
+			{
+				$sql .= ' SKIP '. (int) $offset;
+			}
+		}
+		else
+		{
+			$sql = 'ROWS ' . (int) $limit;
+
+			if ($offset > 0)
+			{
+				$sql = 'ROWS '. (int) $offset . ' TO ' . ($limit + $offset);
+			}
+		}
+
+		return preg_replace('`SELECT`i', "SELECT {$sql}", $orig_sql);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Close DB Connection
+	 *
+	 * @param	resource
+	 * @return	void
+	 */
+	protected function _close($conn_id)
+	{
+		@ibase_close($conn_id);
+	}
+
+}
+
+/* End of file interbase_driver.php */
+/* Location: ./system/database/drivers/interbase/interbase_driver.php */
diff --git a/system/database/drivers/interbase/interbase_forge.php b/system/database/drivers/interbase/interbase_forge.php
new file mode 100644
index 000000000..023d278ce
--- /dev/null
+++ b/system/database/drivers/interbase/interbase_forge.php
@@ -0,0 +1,243 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 5.1.6 or newer
+ *
+ * NOTICE OF LICENSE
+ *
+ * Licensed under the Open Software License version 3.0
+ *
+ * This source file is subject to the Open Software License (OSL 3.0) that is
+ * bundled with this package in the files license.txt / license.rst.  It is
+ * also available through the world wide web at this URL:
+ * http://opensource.org/licenses/OSL-3.0
+ * If you did not receive a copy of the license and are unable to obtain it
+ * through the world wide web, please send an email to
+ * licensing@ellislab.com so we can send you a copy immediately.
+ *
+ * @package		CodeIgniter
+ * @author		EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
+ * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
+ * @link		http://codeigniter.com
+ * @since		Version 3.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Interbase/Firebird Forge Class
+ *
+ * @category	Database
+ * @author		EllisLab Dev Team
+ * @link		http://codeigniter.com/user_guide/database/
+ */
+class CI_DB_interbase_forge extends CI_DB_forge {
+
+	/**
+	 * Create database
+	 *
+	 * @param	string	the database name
+	 * @return	string
+	 */
+	protected function _create_database($filename='')
+	{
+		// Firebird databases are flat files, so a path is required 
+		// Hostname is needed for remote access
+		return 'CREATE DATABASE "'.$this->hostname.':'.$filename.'"';
+		
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Drop database
+	 *
+	 * @param	string	the database name - not used in this driver 
+	 *	- the current db is dropped
+	 * @return	bool
+	 */
+	protected function _drop_database($name='')
+	{
+		return ibase_drop_db($this->conn_id);
+	}
+	// --------------------------------------------------------------------
+
+	/**
+	 * Create Table
+	 *
+	 * @param	string	the table name
+	 * @param	array	the fields
+	 * @param	mixed	primary key(s)
+	 * @param	mixed	key(s)
+	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL
+	 * @return	string
+	 */
+	protected function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
+	{
+		$sql = 'CREATE TABLE ';
+
+		$sql .= $this->db->protect_identifiers($table)."(";
+		$current_field_count = 0;
+
+		foreach ($fields as $field => $attributes)
+		{
+			// Numeric field names aren't allowed in databases, so if the key is
+			// numeric, we know it was assigned by PHP and the developer manually
+			// entered the field information, so we'll simply add it to the list
+			if (is_numeric($field))
+			{
+				$sql .= "\n\t$attributes";
+			}
+			else
+			{
+				$attributes = array_change_key_case($attributes, CASE_UPPER);
+
+				$sql .= "\n\t".$this->db->protect_identifiers($field);
+
+				$sql .=  ' '.$attributes['TYPE'];
+
+				if (array_key_exists('CONSTRAINT', $attributes))
+				{
+					$sql .= '('.$attributes['CONSTRAINT'].')';
+				}
+
+				if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
+				{
+					$sql .= ' UNSIGNED';
+				}
+
+				if (array_key_exists('DEFAULT', $attributes))
+				{
+					$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
+				}
+
+				if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
+				{
+					$sql .= ' NULL';
+				}
+				else
+				{
+					$sql .= ' NOT NULL';
+				}
+
+				if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
+				{
+					$sql .= ' AUTO_INCREMENT';
+				}
+			}
+
+			// don't add a comma on the end of the last field
+			if (++$current_field_count < count($fields))
+			{
+				$sql .= ',';
+			}
+		}
+
+		if (count($primary_keys) > 0)
+		{
+			$primary_keys = $this->db->protect_identifiers($primary_keys);
+			$sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")";
+		}
+
+		if (is_array($keys) && count($keys) > 0)
+		{
+			foreach ($keys as $key)
+			{
+				if (is_array($key))
+				{
+					$key = $this->db->protect_identifiers($key);
+				}
+				else
+				{
+					$key = array($this->db->protect_identifiers($key));
+				}
+
+				$sql .= ",\n\tUNIQUE (" . implode(', ', $key) . ")";
+			}
+		}
+
+		$sql .= "\n)";
+
+		return $sql;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Drop Table
+	 *
+	 * @return	string
+	 */
+	protected function _drop_table($table)
+	{
+		return 'DROP TABLE '.$name;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Alter table query
+	 *
+	 * Generates a platform-specific query so that a table can be altered
+	 * Called by add_column(), drop_column(), and column_alter(),
+	 *
+	 * @param	string	the ALTER type (ADD, DROP, CHANGE)
+	 * @param	string	the column name
+	 * @param	string	the table name
+	 * @param	string	the column definition
+	 * @param	string	the default value
+	 * @param	boolean	should 'NOT NULL' be added
+	 * @param	string	the field after which we should add the new field
+	 * @return	string
+	 */
+	protected function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')
+	{
+		$sql = 'ALTER TABLE '.$this->db->protect_identifiers($table)." $alter_type ".$this->db->protect_identifiers($column_name);
+
+		$sql .= " {$column_definition}";
+
+		if ($default_value != '')
+		{
+			$sql .= " DEFAULT \"{$default_value}\"";
+		}
+
+		if ($null === NULL)
+		{
+			$sql .= ' NULL';
+		}
+		else
+		{
+			$sql .= ' NOT NULL';
+		}
+
+		if ($after_field != '')
+		{
+			$sql .= ' AFTER ' . $this->db->protect_identifiers($after_field);
+		}
+
+		return $sql;
+
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Rename a table
+	 *
+	 * Generates a platform-specific query so that a table can be renamed
+	 *
+	 * @param	string	the old table name
+	 * @param	string	the new table name
+	 * @return	string
+	 */
+	protected function _rename_table($table_name, $new_table_name)
+	{
+		return 'ALTER TABLE '.$this->db->protect_identifiers($table_name).' RENAME TO '.$this->db->protect_identifiers($new_table_name);
+	}
+}
+
+/* End of file interbase_forge.php */
+/* Location: ./system/database/drivers/interbase/interbase_forge.php */
\ No newline at end of file
diff --git a/system/database/drivers/interbase/interbase_result.php b/system/database/drivers/interbase/interbase_result.php
new file mode 100644
index 000000000..4b15eee20
--- /dev/null
+++ b/system/database/drivers/interbase/interbase_result.php
@@ -0,0 +1,294 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 5.1.6 or newer
+ *
+ * NOTICE OF LICENSE
+ *
+ * Licensed under the Open Software License version 3.0
+ *
+ * This source file is subject to the Open Software License (OSL 3.0) that is
+ * bundled with this package in the files license.txt / license.rst.  It is
+ * also available through the world wide web at this URL:
+ * http://opensource.org/licenses/OSL-3.0
+ * If you did not receive a copy of the license and are unable to obtain it
+ * through the world wide web, please send an email to
+ * licensing@ellislab.com so we can send you a copy immediately.
+ *
+ * @package		CodeIgniter
+ * @author		EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
+ * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
+ * @link		http://codeigniter.com
+ * @since		Version 3.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Interbase/Firebird Result Class
+ *
+ * This class extends the parent result class: CI_DB_result
+ *
+ * @category	Database
+ * @author		EllisLab Dev Team
+ * @link		http://codeigniter.com/user_guide/database/
+ */
+class CI_DB_interbase_result extends CI_DB_result {
+
+	public $num_rows;
+
+	/**
+	 * Number of rows in the result set
+	 *
+	 * @return	integer
+	 */
+	public function num_rows()
+	{
+		if( ! is_null($this->num_rows))
+		{
+			return $this->num_rows;
+		}
+		
+		//Get the results so that you can get an accurate rowcount
+		$this->result();
+		
+		return $this->num_rows;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Number of fields in the result set
+	 *
+	 * @return	integer
+	 */
+	public function num_fields()
+	{
+		return @ibase_num_fields($this->result_id);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Fetch Field Names
+	 *
+	 * Generates an array of column names
+	 *
+	 * @return	array
+	 */
+	public function list_fields()
+	{
+		$field_names = array();
+		for ($i = 0, $num_fields = $this->num_fields(); $i < $num_fields; $i++)
+		{
+			$info = ibase_field_info($this->result_id, $i);
+			$field_names[] = $info['name'];
+		}
+
+		return $field_names;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Field data
+	 *
+	 * Generates an array of objects containing field meta-data
+	 *
+	 * @return	array
+	 */
+	public function field_data()
+	{
+		
+		$retval = array();
+		for ($i = 0, $num_fields = $this->num_fields(); $i < $num_fields; $i++)
+		{
+			$info = ibase_field_info($this->result_id, $i);
+		
+			$F				= new stdClass();
+			$F->name		= $info['name'];
+			$F->type		= $info['type'];
+			$F->max_length	= $info['length'];
+			$F->primary_key = 0;
+			$F->default		= '';
+
+			$retval[] = $F;
+		}
+
+		return $retval;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Free the result
+	 *
+	 * @return	null
+	 */
+	public function free_result()
+	{
+		@ibase_free_result($this->result_id);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Data Seek
+	 *
+	 * Moves the internal pointer to the desired offset.  We call
+	 * this internally before fetching results to make sure the
+	 * result set starts at zero
+	 *
+	 * @return	array
+	 */
+	protected function _data_seek($n = 0)
+	{
+		//Set the row count to 0
+		$this->num_rows = 0;
+	
+		//Interbase driver doesn't implement a suitable function
+		return FALSE;	
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Result - associative array
+	 *
+	 * Returns the result set as an array
+	 *
+	 * @return	array
+	 */
+	protected function _fetch_assoc()
+	{
+		if (($row = @ibase_fetch_assoc($this->result_id, IBASE_FETCH_BLOBS)) !== FALSE)
+		{
+			//Increment row count
+			$this->num_rows++;
+		}
+	
+		return $row;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Result - object
+	 *
+	 * Returns the result set as an object
+	 *
+	 * @return	object
+	 */
+	protected function _fetch_object()
+	{
+		if (($row = @ibase_fetch_object($this->result_id, IBASE_FETCH_BLOBS)) !== FALSE)
+		{
+			//Increment row count
+			$this->num_rows++;
+		}
+		
+		return $row;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Query result.  "object" version.
+	 *
+	 * @return	object
+	 */
+	public function result_object()
+	{
+		if (count($this->result_object) > 0)
+		{
+			return $this->result_object;
+		}
+		
+		// Convert result array to object so that 
+		// We don't have to get the result again
+		if (count($this->result_array) > 0)
+		{
+			$i = 0;
+		
+			foreach ($this->result_array as $array)
+			{
+				$this->result_object[$i] = new StdClass();
+			
+				foreach ($array as $key => $val)
+				{
+					$this->result_object[$i]->{$key} = $val;
+				}
+				
+				++$i;
+			}
+			
+			return $this->result_object;
+		}
+
+		// In the event that query caching is on the result_id variable
+		// will return FALSE since there isn't a valid SQL resource so
+		// we'll simply return an empty array.
+		if ($this->result_id === FALSE)
+		{
+			return array();
+		}
+
+		$this->num_rows = 0;
+		while ($row = $this->_fetch_object())
+		{
+			$this->result_object[] = $row;
+		}
+
+		return $this->result_object;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Query result.  "array" version.
+	 *
+	 * @return	array
+	 */
+	public function result_array()
+	{
+		if (count($this->result_array) > 0)
+		{
+			return $this->result_array;
+		}
+		
+		// Since the object and array are really similar, just case
+		// the result object to an array  if need be
+		if (count($this->result_object) > 0)
+		{
+			foreach ($this->result_object as $obj)
+			{
+				$this->result_array[] = (array) $obj;
+			}
+		
+			return $this->result_array;
+		}
+
+		// In the event that query caching is on the result_id variable
+		// will return FALSE since there isn't a valid SQL resource so
+		// we'll simply return an empty array.
+		if ($this->result_id === FALSE)
+		{
+			return array();
+		}
+
+		$this->num_rows = 0;
+		while ($row = $this->_fetch_assoc())
+		{
+			$this->result_array[] = $row;
+		}
+
+		return $this->result_array;
+	}
+
+}
+
+/* End of file interbase_result.php */
+/* Location: ./system/database/drivers/interbase/interbase_result.php */
\ No newline at end of file
diff --git a/system/database/drivers/interbase/interbase_utility.php b/system/database/drivers/interbase/interbase_utility.php
new file mode 100644
index 000000000..76a0497c1
--- /dev/null
+++ b/system/database/drivers/interbase/interbase_utility.php
@@ -0,0 +1,115 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 5.1.6 or newer
+ *
+ * NOTICE OF LICENSE
+ *
+ * Licensed under the Open Software License version 3.0
+ *
+ * This source file is subject to the Open Software License (OSL 3.0) that is
+ * bundled with this package in the files license.txt / license.rst.  It is
+ * also available through the world wide web at this URL:
+ * http://opensource.org/licenses/OSL-3.0
+ * If you did not receive a copy of the license and are unable to obtain it
+ * through the world wide web, please send an email to
+ * licensing@ellislab.com so we can send you a copy immediately.
+ *
+ * @package		CodeIgniter
+ * @author		EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
+ * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
+ * @link		http://codeigniter.com
+ * @since		Version 3.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Interbase/Firebird Utility Class
+ *
+ * @category	Database
+ * @author		EllisLab Dev Team
+ * @link		http://codeigniter.com/user_guide/database/
+ */
+class CI_DB_interbase_utility extends CI_DB_utility {
+
+	/**
+	 * List databases
+	 *
+	 * I don't believe you can do a database listing with Firebird
+	 * since each database is its own file.  I suppose we could
+	 * try reading a directory looking for Firebird files, but
+	 * that doesn't seem like a terribly good idea
+	 *
+	 * @return	bool
+	 */
+	public function _list_databases()
+	{
+		if ($this->db_debug)
+		{
+			return $this->db->display_error('db_unsuported_feature');
+		}
+		return FALSE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Optimize table query
+	 *
+	 * Is optimization even supported in Interbase/Firebird?
+	 *
+	 * @param	string	the table name
+	 * @return	object
+	 */
+	public function _optimize_table($table)
+	{
+		return FALSE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Repair table query
+	 *
+	 * Table repairs are not supported in Interbase/Firebird
+	 *
+	 * @param	string	the table name
+	 * @return	object
+	 */
+	public function _repair_table($table)
+	{
+		return FALSE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Interbase/Firebird Export
+	 *
+	 * @param	string	$filename
+	 * @return	mixed
+	 */
+	public function backup($filename)
+	{
+		if ($service = ibase_service_attach($this->db->hostname, $this->db->username, $this->db->password))
+		{
+			$res = ibase_backup($service, $this->db->database, $filename.'.fbk');
+			
+			//Close the service connection	
+			ibase_service_detach($service);
+			
+			return $res;
+		}
+		else
+		{
+			return FALSE;
+		}
+	}
+}
+
+/* End of file interbase_utility.php */
+/* Location: ./system/database/drivers/interbase/interbase_utility.php */
\ No newline at end of file
diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php
index 25a32f364..147c63483 100644
--- a/system/database/drivers/mssql/mssql_driver.php
+++ b/system/database/drivers/mssql/mssql_driver.php
@@ -138,22 +138,6 @@ class CI_DB_mssql_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Set client character set
-	 *
-	 * @access	public
-	 * @param	string
-	 * @param	string
-	 * @return	resource
-	 */
-	function db_set_charset($charset, $collation)
-	{
-		// @todo - add support if needed
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Execute the query
 	 *
 	 * @access	private called by the base class
@@ -355,12 +339,11 @@ class CI_DB_mssql_driver extends CI_DB {
 	/**
 	* Version number query string
 	*
-	* @access public
-	* @return string
+	* @return	string
 	*/
-	function _version()
+	protected function _version()
 	{
-		return "SELECT @@VERSION AS ver";
+		return 'SELECT @@VERSION AS ver';
 	}
 
 	// --------------------------------------------------------------------
@@ -454,28 +437,18 @@ class CI_DB_mssql_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message string
+	 * Error
 	 *
-	 * @access	private
-	 * @return	string
-	 */
-	function _error_message()
-	{
-		return mssql_get_last_message();
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * The error message number
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
 	 *
-	 * @access	private
-	 * @return	integer
+	 * @return	array
 	 */
-	function _error_number()
+	public function error()
 	{
-		// Are error numbers supported?
-		return '';
+		$query = $this->query('SELECT @@ERROR AS code');
+		$query = $query->row();
+		return array('code' => $query->code, 'message' => mssql_get_last_message());
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/database/drivers/mysql/mysql_driver.php b/system/database/drivers/mysql/mysql_driver.php
index c88a8a766..7fd08a6ed 100644
--- a/system/database/drivers/mysql/mysql_driver.php
+++ b/system/database/drivers/mysql/mysql_driver.php
@@ -147,7 +147,7 @@ class CI_DB_mysql_driver extends CI_DB {
 	 * @param	string
 	 * @return	bool
 	 */
-	public function db_set_charset($charset, $collation)
+	protected function _db_set_charset($charset, $collation)
 	{
 		return function_exists('mysql_set_charset')
 			? @mysql_set_charset($charset, $this->conn_id)
@@ -157,13 +157,15 @@ class CI_DB_mysql_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Version number query string
+	 * Database version number
 	 *
 	 * @return	string
 	 */
-	protected function _version()
+	public function version()
 	{
-		return 'SELECT version() AS ver';
+		return isset($this->data_cache['version'])
+			? $this->data_cache['version']
+			: $this->data_cache['version'] = @mysql_get_server_info($this->conn_id);
 	}
 
 	// --------------------------------------------------------------------
@@ -402,40 +404,50 @@ class CI_DB_mysql_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Field data query
-	 *
-	 * Generates a platform-specific query so that the column data can be retrieved
+	 * Returns an object with field data
 	 *
 	 * @param	string	the table name
-	 * @return	string
+	 * @return	object
 	 */
-	public function _field_data($table)
+	public function field_data($table = '')
 	{
-		return 'DESCRIBE '.$table;
-	}
+		if ($table == '')
+		{
+			return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE;
+		}
 
-	// --------------------------------------------------------------------
+		$query = $this->query('DESCRIBE '.$this->_protect_identifiers($table, TRUE, NULL, FALSE));
+		$query = $query->result_object();
 
-	/**
-	 * The error message string
-	 *
-	 * @return	string
-	 */
-	protected function _error_message()
-	{
-		return mysql_error($this->conn_id);
+		$retval = array();
+		for ($i = 0, $c = count($query); $i < $c; $i++)
+		{
+			preg_match('/([a-z]+)(\(\d+\))?/', $query[$i]->Type, $matches);
+
+			$retval[$i]			= new stdClass();
+			$retval[$i]->name		= $query[$i]->Field;
+			$retval[$i]->type		= empty($matches[1]) ? NULL : $matches[1];
+			$retval[$i]->default		= $query[$i]->Default;
+			$retval[$i]->max_length		= empty($matches[2]) ? NULL : preg_replace('/[^\d]/', '', $matches[2]);
+			$retval[$i]->primary_key	= (int) ($query[$i]->Key === 'PRI');
+		}
+
+		return $retval;
 	}
 
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message number
+	 * Error
 	 *
-	 * @return	int
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
+	 *
+	 * @return	array
 	 */
-	protected function _error_number()
+	public function error()
 	{
-		return mysql_errno($this->conn_id);
+		return array('code' => mysql_errno($this->conn_id), 'message' => mysql_error($this->conn_id));
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/database/drivers/mysql/mysql_result.php b/system/database/drivers/mysql/mysql_result.php
index 8f04a936d..5a65d9c72 100644
--- a/system/database/drivers/mysql/mysql_result.php
+++ b/system/database/drivers/mysql/mysql_result.php
@@ -90,18 +90,14 @@ class CI_DB_mysql_result extends CI_DB_result {
 	public function field_data()
 	{
 		$retval = array();
-		while ($field = mysql_fetch_object($this->result_id))
+		for ($i = 0, $c = $this->num_fields(); $i < $c; $i++)
 		{
-			preg_match('/([a-zA-Z]+)(\(\d+\))?/', $field->Type, $matches);
-
-			$F		= new stdClass();
-			$F->name	= $field->Field;
-			$F->type	= ( ! empty($matches[1])) ? $matches[1] : NULL;
-			$F->default	= $field->Default;
-			$F->max_length	= ( ! empty($matches[2])) ? preg_replace('/[^\d]/', '', $matches[2]) : NULL;
-			$F->primary_key = (int) ($field->Key === 'PRI');
-
-			$retval[] = $F;
+			$retval[$i]			= new stdClass();
+			$retval[$i]->name		= mysql_field_name($this->result_id, $i);
+			$retval[$i]->type		= mysql_field_type($this->result_id, $i);
+			$retval[$i]->max_length		= mysql_field_len($this->result_id, $i);
+			$retval[$i]->primary_key	= (strpos(mysql_field_flags($this->result_id, $i), 'primary_key') === FALSE) ? 0 : 1;
+			$retval[$i]->default		= '';
 		}
 
 		return $retval;
diff --git a/system/database/drivers/mysqli/mysqli_driver.php b/system/database/drivers/mysqli/mysqli_driver.php
index dbba12e15..25b6ceca1 100644
--- a/system/database/drivers/mysqli/mysqli_driver.php
+++ b/system/database/drivers/mysqli/mysqli_driver.php
@@ -157,13 +157,15 @@ class CI_DB_mysqli_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Version number query string
+	 * Database version number
 	 *
 	 * @return	string
 	 */
-	protected function _version()
+	public function version()
 	{
-		return @mysqli_get_server_info($this->conn_id);
+		return isset($this->data_cache['version'])
+			? $this->data_cache['version']
+			: $this->data_cache['version'] = @mysqli_get_server_info($this->conn_id);
 	}
 
 	// --------------------------------------------------------------------
@@ -403,40 +405,50 @@ class CI_DB_mysqli_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Field data query
-	 *
-	 * Generates a platform-specific query so that the column data can be retrieved
+	 * Returns an object with field data
 	 *
 	 * @param	string	the table name
-	 * @return	string
+	 * @return	object
 	 */
-	protected function _field_data($table)
+	public function field_data($table = '')
 	{
-		return 'DESCRIBE '.$table;
-	}
+		if ($table == '')
+		{
+			return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE;
+		}
 
-	// --------------------------------------------------------------------
+		$query = $this->query('DESCRIBE '.$this->_protect_identifiers($table, TRUE, NULL, FALSE));
+		$query = $query->result_object();
 
-	/**
-	 * The error message string
-	 *
-	 * @return	string
-	 */
-	protected function _error_message()
-	{
-		return mysqli_error($this->conn_id);
+		$retval = array();
+		for ($i = 0, $c = count($query); $i < $c; $i++)
+		{
+			preg_match('/([a-z]+)(\(\d+\))?/', $query[$i]->Type, $matches);
+
+			$retval[$i]			= new stdClass();
+			$retval[$i]->name		= $query[$i]->Field;
+			$retval[$i]->type		= empty($matches[1]) ? NULL : $matches[1];
+			$retval[$i]->default		= $query[$i]->Default;
+			$retval[$i]->max_length		= empty($matches[2]) ? NULL : preg_replace('/[^\d]/', '', $matches[2]);
+			$retval[$i]->primary_key	= (int) ($query[$i]->Key === 'PRI');
+		}
+
+		return $retval;
 	}
 
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message number
+	 * Error
 	 *
-	 * @return	int
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
+	 *
+	 * @return	array
 	 */
-	protected function _error_number()
+	public function error()
 	{
-		return mysqli_errno($this->conn_id);
+		return array('code' => mysqli_errno($this->conn_id), 'message' => mysqli_error($this->conn_id));
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/database/drivers/mysqli/mysqli_result.php b/system/database/drivers/mysqli/mysqli_result.php
index 0a50cccac..8b909cc56 100644
--- a/system/database/drivers/mysqli/mysqli_result.php
+++ b/system/database/drivers/mysqli/mysqli_result.php
@@ -90,18 +90,15 @@ class CI_DB_mysqli_result extends CI_DB_result {
 	public function field_data()
 	{
 		$retval = array();
-		while ($field = mysqli_fetch_object($this->result_id))
+		$field_data = mysqli_fetch_fields($this->result_id);
+		for ($i = 0, $c = count($field_data); $i < $c; $i++)
 		{
-			preg_match('/([a-zA-Z]+)(\(\d+\))?/', $field->Type, $matches);
-
-			$F		= new stdClass();
-			$F->name	= $field->Field;
-			$F->type	= ( ! empty($matches[1])) ? $matches[1] : NULL;
-			$F->default	= $field->Default;
-			$F->max_length	= ( ! empty($matches[2])) ? preg_replace('/[^\d]/', '', $matches[2]) : NULL;
-			$F->primary_key = (int) ($field->Key === 'PRI');
-
-			$retval[] = $F;
+			$retval[$i]			= new stdClass();
+			$retval[$i]->name		= $field_data[$i]->name;
+			$retval[$i]->type		= $field_data[$i]->type;
+			$retval[$i]->max_length		= $field_data[$i]->max_length;
+			$retval[$i]->primary_key	= (int) ($field_data[$i]->flags & 2);
+			$retval[$i]->default		= '';
 		}
 
 		return $retval;
diff --git a/system/database/drivers/oci8/oci8_driver.php b/system/database/drivers/oci8/oci8_driver.php
index c6621901b..35cafff6c 100644
--- a/system/database/drivers/oci8/oci8_driver.php
+++ b/system/database/drivers/oci8/oci8_driver.php
@@ -139,30 +139,15 @@ class CI_DB_oci8_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Set client character set
+	 * Database version number
 	 *
-	 * @access	public
-	 * @param	string
-	 * @param	string
-	 * @return	resource
-	 */
-	public function db_set_charset($charset, $collation)
-	{
-		// this is done upon connect
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Version number query string
-	 *
-	 * @access  protected
-	 * @return  string
+	 * @return	string
 	 */
-	protected function _version()
+	public function version()
 	{
-		return oci_server_version($this->conn_id);
+		return isset($this->data_cache['version'])
+			? $this->data_cache['version']
+			: $this->data_cache['version'] = oci_server_version($this->conn_id);
 	}
 
 	// --------------------------------------------------------------------
@@ -398,10 +383,9 @@ class CI_DB_oci8_driver extends CI_DB {
 	/**
 	 * Escape String
 	 *
-	 * @access  public
-	 * @param   string
+	 * @param	string
 	 * @param	bool	whether or not the string will be used in a LIKE condition
-	 * @return  string
+	 * @return	string
 	 */
 	public function escape_str($str, $like = FALSE)
 	{
@@ -415,15 +399,14 @@ class CI_DB_oci8_driver extends CI_DB {
 			return $str;
 		}
 
-		$str = remove_invisible_characters($str);
-		$str = str_replace("'", "''", $str);
+		$str = str_replace("'", "''", remove_invisible_characters($str));
 
 		// escape LIKE condition wildcards
 		if ($like === TRUE)
 		{
-			$str = str_replace(	array('%', '_', $this->_like_escape_chr),
-								array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
-								$str);
+			return str_replace(array($this->_like_escape_chr, '%', '_'),
+						array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'),
+						$str);
 		}
 
 		return $str;
@@ -545,31 +528,32 @@ class CI_DB_oci8_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message string
+	 * Error
 	 *
-	 * @access  protected
-	 * @return  string
-	 */
-	protected function _error_message()
-	{
-		// If the error was during connection, no conn_id should be passed
-		$error = is_resource($this->conn_id) ? oci_error($this->conn_id) : oci_error();
-		return $error['message'];
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * The error message number
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
 	 *
-	 * @access  protected
-	 * @return  integer
+	 * @return	array
 	 */
-	protected function _error_number()
+	public function error()
 	{
-		// Same as _error_message()
-		$error = is_resource($this->conn_id) ? oci_error($this->conn_id) : oci_error();
-		return $error['code'];
+		/* oci_error() returns an array that already contains the
+		 * 'code' and 'message' keys, so we can just return it.
+		 */
+		if (is_resource($this->curs_id))
+		{
+			return oci_error($this->curs_id);
+		}
+		elseif (is_resource($this->stmt_id))
+		{
+			return oci_error($this->stmt_id);
+		}
+		elseif (is_resource($this->conn_id))
+		{
+			return oci_error($this->conn_id);
+		}
+
+		return oci_error();
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/database/drivers/oci8/oci8_forge.php b/system/database/drivers/oci8/oci8_forge.php
index b4a24cdca..0aa119907 100644
--- a/system/database/drivers/oci8/oci8_forge.php
+++ b/system/database/drivers/oci8/oci8_forge.php
@@ -67,15 +67,14 @@ class CI_DB_oci8_forge extends CI_DB_forge {
 	/**
 	 * Create Table
 	 *
-	 * @access	private
 	 * @param	string	the table name
 	 * @param	array	the fields
 	 * @param	mixed	primary key(s)
 	 * @param	mixed	key(s)
-	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL
+	 * @param	bool	should 'IF NOT EXISTS' be added to the SQL
 	 * @return	bool
 	 */
-	function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
+	public function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
 	{
 		$sql = 'CREATE TABLE ';
 
@@ -84,54 +83,27 @@ class CI_DB_oci8_forge extends CI_DB_forge {
 			$sql .= 'IF NOT EXISTS ';
 		}
 
-		$sql .= $this->db->_escape_identifiers($table)." (";
+		$sql .= $this->db->_escape_identifiers($table).' (';
 		$current_field_count = 0;
 
-		foreach ($fields as $field=>$attributes)
+		foreach ($fields as $field => $attributes)
 		{
 			// Numeric field names aren't allowed in databases, so if the key is
 			// numeric, we know it was assigned by PHP and the developer manually
 			// entered the field information, so we'll simply add it to the list
 			if (is_numeric($field))
 			{
-				$sql .= "\n\t$attributes";
+				$sql .= "\n\t".$attributes;
 			}
 			else
 			{
 				$attributes = array_change_key_case($attributes, CASE_UPPER);
 
-				$sql .= "\n\t".$this->db->_protect_identifiers($field);
-
-				$sql .=  ' '.$attributes['TYPE'];
-
-				if (array_key_exists('CONSTRAINT', $attributes))
-				{
-					$sql .= '('.$attributes['CONSTRAINT'].')';
-				}
-
-				if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
-				{
-					$sql .= ' UNSIGNED';
-				}
-
-				if (array_key_exists('DEFAULT', $attributes))
-				{
-					$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
-				}
-
-				if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
-				{
-					$sql .= ' NULL';
-				}
-				else
-				{
-					$sql .= ' NOT NULL';
-				}
-
-				if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
-				{
-					$sql .= ' AUTO_INCREMENT';
-				}
+				$sql .= "\n\t".$this->db->protect_identifiers($field).' '.$attributes['TYPE']
+					.((isset($attributes['UNSINGED']) && $attributes['UNSIGNED'] === TRUE) ? ' UNSIGNED' : '')
+					.(isset($attributes['DEFAULT']) ? " DEFAULT '".$attributes['DEFAULT']."'" : '')
+					.((isset($attributes['NULL']) && $attributes['NULL'] === TRUE) ? '' : ' NOT NULL')
+					.(isset($attributes['CONSTRAINT']) ? ' CONSTRAINT '.$attributes['CONSTRAINT'] : '');
 			}
 
 			// don't add a comma on the end of the last field
@@ -143,8 +115,8 @@ class CI_DB_oci8_forge extends CI_DB_forge {
 
 		if (count($primary_keys) > 0)
 		{
-			$primary_keys = $this->db->_protect_identifiers($primary_keys);
-			$sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")";
+			$primary_keys = $this->db->protect_identifiers($primary_keys);
+			$sql .= ",\n\tCONSTRAINT ".$table.' PRIMARY KEY ('.implode(', ', $primary_keys).')';
 		}
 
 		if (is_array($keys) && count($keys) > 0)
@@ -153,20 +125,18 @@ class CI_DB_oci8_forge extends CI_DB_forge {
 			{
 				if (is_array($key))
 				{
-					$key = $this->db->_protect_identifiers($key);
+					$key = $this->db->protect_identifiers($key);
 				}
 				else
 				{
-					$key = array($this->db->_protect_identifiers($key));
+					$key = array($this->db->protect_identifiers($key));
 				}
 
-				$sql .= ",\n\tUNIQUE COLUMNS (" . implode(', ', $key) . ")";
+				$sql .= ",\n\tUNIQUE COLUMNS (".implode(', ', $key).")";
 			}
 		}
 
-		$sql .= "\n)";
-
-		return $sql;
+		return $sql."\n)";
 	}
 
 	// --------------------------------------------------------------------
@@ -257,4 +227,4 @@ class CI_DB_oci8_forge extends CI_DB_forge {
 }
 
 /* End of file oci8_forge.php */
-/* Location: ./system/database/drivers/oci8/oci8_forge.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/oci8/oci8_forge.php */
diff --git a/system/database/drivers/odbc/odbc_driver.php b/system/database/drivers/odbc/odbc_driver.php
index 6ba39f0cd..779b0c62f 100644
--- a/system/database/drivers/odbc/odbc_driver.php
+++ b/system/database/drivers/odbc/odbc_driver.php
@@ -124,35 +124,6 @@ class CI_DB_odbc_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Set client character set
-	 *
-	 * @access	public
-	 * @param	string
-	 * @param	string
-	 * @return	resource
-	 */
-	function db_set_charset($charset, $collation)
-	{
-		// @todo - add support if needed
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Version number query string
-	 *
-	 * @access	public
-	 * @return	string
-	 */
-	function _version()
-	{
-		return "SELECT version() AS ver";
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Execute the query
 	 *
 	 * @access	private called by the base class
@@ -414,27 +385,16 @@ class CI_DB_odbc_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message string
+	 * Error
 	 *
-	 * @access	private
-	 * @return	string
-	 */
-	function _error_message()
-	{
-		return odbc_errormsg($this->conn_id);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * The error message number
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
 	 *
-	 * @access	private
-	 * @return	integer
+	 * @return	array
 	 */
-	function _error_number()
+	public function error()
 	{
-		return odbc_error($this->conn_id);
+		return array('code' => odbc_error($this->conn_id), 'message' => odbc_errormsg($this->conn_id));
 	}
 
 	// --------------------------------------------------------------------
@@ -646,4 +606,4 @@ class CI_DB_odbc_driver extends CI_DB {
 
 
 /* End of file odbc_driver.php */
-/* Location: ./system/database/drivers/odbc/odbc_driver.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/odbc/odbc_driver.php */
diff --git a/system/database/drivers/odbc/odbc_result.php b/system/database/drivers/odbc/odbc_result.php
index ba660856e..572e110ca 100644
--- a/system/database/drivers/odbc/odbc_result.php
+++ b/system/database/drivers/odbc/odbc_result.php
@@ -38,15 +38,27 @@
  */
 class CI_DB_odbc_result extends CI_DB_result {
 
+	public $num_rows;
+
 	/**
 	 * Number of rows in the result set
 	 *
-	 * @access	public
-	 * @return	integer
+	 * @return	int
 	 */
-	function num_rows()
+	public function num_rows()
 	{
-		return @odbc_num_rows($this->result_id);
+		if (is_int($this->num_rows))
+		{
+			return $this->num_rows;
+		}
+
+		// Work-around for ODBC subdrivers that don't support num_rows()
+		if (($this->num_rows = @odbc_num_rows($this->result_id)) === -1)
+		{
+			$this->num_rows = count($this->result_array());
+		}
+
+		return $this->num_rows;
 	}
 
 	// --------------------------------------------------------------------
@@ -54,10 +66,9 @@ class CI_DB_odbc_result extends CI_DB_result {
 	/**
 	 * Number of fields in the result set
 	 *
-	 * @access	public
-	 * @return	integer
+	 * @return	int
 	 */
-	function num_fields()
+	public function num_fields()
 	{
 		return @odbc_num_fields($this->result_id);
 	}
@@ -69,15 +80,19 @@ class CI_DB_odbc_result extends CI_DB_result {
 	 *
 	 * Generates an array of column names
 	 *
-	 * @access	public
 	 * @return	array
 	 */
-	function list_fields()
+	public function list_fields()
 	{
 		$field_names = array();
-		for ($i = 0; $i < $this->num_fields(); $i++)
+		$num_fields = $this->num_fields();
+
+		if ($num_fields > 0)
 		{
-			$field_names[]	= odbc_field_name($this->result_id, $i);
+			for ($i = 1; $i <= $num_fields; $i++)
+			{
+				$field_names[] = odbc_field_name($this->result_id, $i);
+			}
 		}
 
 		return $field_names;
@@ -90,22 +105,19 @@ class CI_DB_odbc_result extends CI_DB_result {
 	 *
 	 * Generates an array of objects containing field meta-data
 	 *
-	 * @access	public
 	 * @return	array
 	 */
-	function field_data()
+	public function field_data()
 	{
 		$retval = array();
-		for ($i = 0; $i < $this->num_fields(); $i++)
+		for ($i = 0, $odbc_index = 1, $c = $this->num_fields(); $i < $c; $i++, $odbc_index++)
 		{
-			$F				= new stdClass();
-			$F->name		= odbc_field_name($this->result_id, $i);
-			$F->type		= odbc_field_type($this->result_id, $i);
-			$F->max_length	= odbc_field_len($this->result_id, $i);
-			$F->primary_key = 0;
-			$F->default		= '';
-
-			$retval[] = $F;
+			$retval[$i]			= new stdClass();
+			$retval[$i]->name		= odbc_field_name($this->result_id, $odbc_index);
+			$retval[$i]->type		= odbc_field_type($this->result_id, $odbc_index);
+			$retval[$i]->max_length		= odbc_field_len($this->result_id, $odbc_index);
+			$retval[$i]->primary_key	= 0;
+			$retval[$i]->default		= '';
 		}
 
 		return $retval;
@@ -237,4 +249,4 @@ class CI_DB_odbc_result extends CI_DB_result {
 
 
 /* End of file odbc_result.php */
-/* Location: ./system/database/drivers/odbc/odbc_result.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/odbc/odbc_result.php */
diff --git a/system/database/drivers/pdo/pdo_driver.php b/system/database/drivers/pdo/pdo_driver.php
index de2b0abeb..8fdfd58fb 100644
--- a/system/database/drivers/pdo/pdo_driver.php
+++ b/system/database/drivers/pdo/pdo_driver.php
@@ -289,29 +289,15 @@ class CI_DB_pdo_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Set client character set
+	 * Database version number
 	 *
-	 * @access	public
-	 * @param	string
-	 * @param	string
-	 * @return	resource
-	 */
-	function db_set_charset($charset, $collation)
-	{
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Version number query string
-	 *
-	 * @access	public
 	 * @return	string
 	 */
-	function _version()
+	public function version()
 	{
-		return $this->conn_id->getAttribute(PDO::ATTR_CLIENT_VERSION);
+		return isset($this->data_cache['version'])
+			? $this->data_cache['version']
+			: $this->data_cache['version'] = $this->conn_id->getAttribute(PDO::ATTR_SERVER_VERSION);
 	}
 
 	// --------------------------------------------------------------------
@@ -510,33 +496,19 @@ class CI_DB_pdo_driver extends CI_DB {
 
 	/**
 	 * Insert ID
-	 * 
-	 * @access	public
-	 * @return	integer
+	 *
+	 * @return	int
 	 */
-	function insert_id($name=NULL)
+	public function insert_id($name = NULL)
 	{
-		if ($this->pdodriver == 'pgsql')
+		if ($this->pdodriver === 'pgsql' && $name === NULL && $this->version() >= '8.1')
 		{
-			//Convenience method for postgres insertid
-			$v = $this->_version();
-
-			$table	= func_num_args() > 0 ? func_get_arg(0) : NULL;
-
-			if ($table == NULL && $v >= '8.1')
-			{
-				$sql='SELECT LASTVAL() as ins_id';
-			}
-
-			$query = $this->query($sql);
-			$row   = $query->row();
-
-			return $row->ins_id;
-		}
-		else
-		{
-			return $this->conn_id->lastInsertId($name);
+			$query = $this->query('SELECT LASTVAL() AS ins_id');
+			$query = $query->row();
+			return $query->ins_id;
 		}
+
+		return $this->conn_id->lastInsertId($name);
 	}
 
 	// --------------------------------------------------------------------
@@ -639,29 +611,30 @@ class CI_DB_pdo_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message string
+	 * Error
 	 *
-	 * @access	private
-	 * @return	string
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
+	 *
+	 * @return	array
 	 */
-	function _error_message()
+	public function error()
 	{
-		$error_array = $this->conn_id->errorInfo();
+		$error = array('code' => '00000', 'message' => '');
+		$pdo_error = $this->conn_id->errorInfo();
 
-		return $error_array[2];
-	}
+		if (empty($pdo_error[0]))
+		{
+			return $error;
+		}
 
-	// --------------------------------------------------------------------
+		$error['code'] = isset($pdo_error[1]) ? $pdo_error[0].'/'.$pdo_error[1] : $pdo_error[0];
+		if (isset($pdo_error[2]))
+		{
+			 $error['message'] = $pdo_error[2];
+		}
 
-	/**
-	 * The error message number
-	 *
-	 * @access	private
-	 * @return	integer
-	 */
-	function _error_number()
-	{
-		return $this->conn_id->errorCode();
+		return $error;
 	}
 
 	// --------------------------------------------------------------------
@@ -950,4 +923,4 @@ class CI_DB_pdo_driver extends CI_DB {
 }
 
 /* End of file pdo_driver.php */
-/* Location: ./system/database/drivers/pdo/pdo_driver.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/pdo/pdo_driver.php */
diff --git a/system/database/drivers/postgre/postgre_driver.php b/system/database/drivers/postgre/postgre_driver.php
index 42329bded..df0f50da5 100644
--- a/system/database/drivers/postgre/postgre_driver.php
+++ b/system/database/drivers/postgre/postgre_driver.php
@@ -149,28 +149,41 @@ class CI_DB_postgre_driver extends CI_DB {
 	/**
 	 * Set client character set
 	 *
-	 * @access	public
-	 * @param	string
-	 * @param	string
-	 * @return	resource
+	 * @param       string
+	 * @return      bool
 	 */
-	function db_set_charset($charset, $collation)
+	protected function _db_set_charset($charset)
 	{
-		// @todo - add support if needed
-		return TRUE;
+		return (pg_set_client_encoding($this->conn_id, $charset) === 0);
 	}
 
 	// --------------------------------------------------------------------
 
 	/**
-	 * Version number query string
+	 * Database version number
 	 *
-	 * @access	public
 	 * @return	string
 	 */
-	function _version()
+	public function version()
 	{
-		return "SELECT version() AS ver";
+		if (isset($this->data_cache['version']))
+		{
+			return $this->data_cache['version'];
+		}
+
+		if (($pg_version = pg_version($this->conn_id)) === FALSE)
+		{
+			return FALSE;
+		}
+
+		/* If PHP was compiled with PostgreSQL lib versions earlier
+		 * than 7.4, pg_version() won't return the server version
+		 * and so we'll have to fall back to running a query in
+		 * order to get it.
+		 */
+		return isset($pg_version['server'])
+			? $this->data_cache['version'] = $pg_version['server']
+			: parent::version();
 	}
 
 	// --------------------------------------------------------------------
@@ -209,18 +222,12 @@ class CI_DB_postgre_driver extends CI_DB {
 	/**
 	 * Begin Transaction
 	 *
-	 * @access	public
 	 * @return	bool
 	 */
-	function trans_begin($test_mode = FALSE)
+	public function trans_begin($test_mode = FALSE)
 	{
-		if ( ! $this->trans_enabled)
-		{
-			return TRUE;
-		}
-
 		// When transactions are nested we only begin/commit/rollback the outermost ones
-		if ($this->_trans_depth > 0)
+		if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
 		{
 			return TRUE;
 		}
@@ -228,9 +235,9 @@ class CI_DB_postgre_driver extends CI_DB {
 		// Reset the transaction failure flag.
 		// If the $test_mode flag is set to TRUE transactions will be rolled back
 		// even if the queries produce a successful result.
-		$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;
+		$this->_trans_failure = ($test_mode === TRUE);
 
-		return @pg_exec($this->conn_id, "begin");
+		return @pg_query($this->conn_id, 'BEGIN');
 	}
 
 	// --------------------------------------------------------------------
@@ -238,23 +245,17 @@ class CI_DB_postgre_driver extends CI_DB {
 	/**
 	 * Commit Transaction
 	 *
-	 * @access	public
 	 * @return	bool
 	 */
-	function trans_commit()
+	public function trans_commit()
 	{
-		if ( ! $this->trans_enabled)
-		{
-			return TRUE;
-		}
-
 		// When transactions are nested we only begin/commit/rollback the outermost ones
-		if ($this->_trans_depth > 0)
+		if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
 		{
 			return TRUE;
 		}
 
-		return @pg_exec($this->conn_id, "commit");
+		return @pg_query($this->conn_id, 'COMMIT');
 	}
 
 	// --------------------------------------------------------------------
@@ -262,23 +263,17 @@ class CI_DB_postgre_driver extends CI_DB {
 	/**
 	 * Rollback Transaction
 	 *
-	 * @access	public
 	 * @return	bool
 	 */
-	function trans_rollback()
+	public function trans_rollback()
 	{
-		if ( ! $this->trans_enabled)
-		{
-			return TRUE;
-		}
-
 		// When transactions are nested we only begin/commit/rollback the outermost ones
-		if ($this->_trans_depth > 0)
+		if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
 		{
 			return TRUE;
 		}
 
-		return @pg_exec($this->conn_id, "rollback");
+		return @pg_query($this->conn_id, 'ROLLBACK');
 	}
 
 	// --------------------------------------------------------------------
@@ -339,8 +334,7 @@ class CI_DB_postgre_driver extends CI_DB {
 	 */
 	function insert_id()
 	{
-		$v = $this->_version();
-		$v = $v['server'];
+		$v = $this->version();
 
 		$table	= func_num_args() > 0 ? func_get_arg(0) : NULL;
 		$column	= func_num_args() > 1 ? func_get_arg(1) : NULL;
@@ -459,27 +453,16 @@ class CI_DB_postgre_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message string
+	 * Error
 	 *
-	 * @access	private
-	 * @return	string
-	 */
-	function _error_message()
-	{
-		return pg_last_error($this->conn_id);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * The error message number
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
 	 *
-	 * @access	private
-	 * @return	integer
+	 * @return	array
 	 */
-	function _error_number()
+	public function error()
 	{
-		return '';
+		return array('code' => '', 'message' => pg_last_error($this->conn_id));
 	}
 
 	// --------------------------------------------------------------------
@@ -712,4 +695,4 @@ class CI_DB_postgre_driver extends CI_DB {
 
 
 /* End of file postgre_driver.php */
-/* Location: ./system/database/drivers/postgre/postgre_driver.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/postgre/postgre_driver.php */
diff --git a/system/database/drivers/postgre/postgre_utility.php b/system/database/drivers/postgre/postgre_utility.php
index dffd8c549..c426b363b 100644
--- a/system/database/drivers/postgre/postgre_utility.php
+++ b/system/database/drivers/postgre/postgre_utility.php
@@ -1,13 +1,13 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
  * An open source application development framework for PHP 5.1.6 or newer
  *
  * NOTICE OF LICENSE
- * 
+ *
  * Licensed under the Open Software License version 3.0
- * 
+ *
  * This source file is subject to the Open Software License (OSL 3.0) that is
  * bundled with this package in the files license.txt / license.rst.  It is
  * also available through the world wide web at this URL:
@@ -25,8 +25,6 @@
  * @filesource
  */
 
-// ------------------------------------------------------------------------
-
 /**
  * Postgre Utility Class
  *
@@ -39,12 +37,11 @@ class CI_DB_postgre_utility extends CI_DB_utility {
 	/**
 	 * List databases
 	 *
-	 * @access	private
-	 * @return	bool
+	 * @return	string
 	 */
-	function _list_databases()
+	public function _list_databases()
 	{
-		return "SELECT datname FROM pg_database";
+		return 'SELECT datname FROM pg_database';
 	}
 
 	// --------------------------------------------------------------------
@@ -52,15 +49,12 @@ class CI_DB_postgre_utility extends CI_DB_utility {
 	/**
 	 * Optimize table query
 	 *
-	 * Is table optimization supported in Postgre?
-	 *
-	 * @access	private
 	 * @param	string	the table name
-	 * @return	object
+	 * @return	string
 	 */
-	function _optimize_table($table)
+	public function _optimize_table($table)
 	{
-		return FALSE;
+		return 'REINDEX TABLE '.$this->db->protect_identifiers($table);
 	}
 
 	// --------------------------------------------------------------------
@@ -68,13 +62,10 @@ class CI_DB_postgre_utility extends CI_DB_utility {
 	/**
 	 * Repair table query
 	 *
-	 * Are table repairs supported in Postgre?
-	 *
-	 * @access	private
 	 * @param	string	the table name
-	 * @return	object
+	 * @return	bool
 	 */
-	function _repair_table($table)
+	public function _repair_table($table)
 	{
 		return FALSE;
 	}
@@ -84,7 +75,6 @@ class CI_DB_postgre_utility extends CI_DB_utility {
 	/**
 	 * Postgre Export
 	 *
-	 * @access	private
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
@@ -95,6 +85,5 @@ class CI_DB_postgre_utility extends CI_DB_utility {
 	}
 }
 
-
 /* End of file postgre_utility.php */
-/* Location: ./system/database/drivers/postgre/postgre_utility.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/postgre/postgre_utility.php */
diff --git a/system/database/drivers/sqlite/sqlite_driver.php b/system/database/drivers/sqlite/sqlite_driver.php
index 28c3caecd..3eaec949c 100644
--- a/system/database/drivers/sqlite/sqlite_driver.php
+++ b/system/database/drivers/sqlite/sqlite_driver.php
@@ -141,30 +141,15 @@ class CI_DB_sqlite_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Set client character set
+	 * Database version number
 	 *
-	 * @access	public
-	 * @param	string
-	 * @param	string
-	 * @return	resource
-	 */
-	function db_set_charset($charset, $collation)
-	{
-		// @todo - add support if needed
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Version number query string
-	 *
-	 * @access	public
 	 * @return	string
 	 */
-	function _version()
+	public function version()
 	{
-		return sqlite_libversion();
+		return isset($this->data_cache['version'])
+			? $this->data_cache['version']
+			: $this->data_cache['version'] = sqlite_libversion();
 	}
 
 	// --------------------------------------------------------------------
@@ -428,27 +413,18 @@ class CI_DB_sqlite_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message string
+	 * Error
 	 *
-	 * @access	private
-	 * @return	string
-	 */
-	function _error_message()
-	{
-		return sqlite_error_string(sqlite_last_error($this->conn_id));
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * The error message number
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
 	 *
-	 * @access	private
-	 * @return	integer
+	 * @return	array
 	 */
-	function _error_number()
+	public function error()
 	{
-		return sqlite_last_error($this->conn_id);
+		$error = array('code' => sqlite_last_error($this->conn_id));
+		$error['message'] = sqlite_error_string($error['code']);
+		return $error;
 	}
 
 	// --------------------------------------------------------------------
@@ -667,4 +643,4 @@ class CI_DB_sqlite_driver extends CI_DB {
 
 
 /* End of file sqlite_driver.php */
-/* Location: ./system/database/drivers/sqlite/sqlite_driver.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/sqlite/sqlite_driver.php */
diff --git a/system/database/drivers/sqlite/sqlite_forge.php b/system/database/drivers/sqlite/sqlite_forge.php
index 2b723be0b..fd0f3eb98 100644
--- a/system/database/drivers/sqlite/sqlite_forge.php
+++ b/system/database/drivers/sqlite/sqlite_forge.php
@@ -89,7 +89,7 @@ class CI_DB_sqlite_forge extends CI_DB_forge {
 		$sql = 'CREATE TABLE ';
 
 		// IF NOT EXISTS added to SQLite in 3.3.0
-		if ($if_not_exists === TRUE && version_compare($this->db->_version(), '3.3.0', '>=') === TRUE)
+		if ($if_not_exists === TRUE && version_compare($this->db->version(), '3.3.0', '>=') === TRUE)
 		{
 			$sql .= 'IF NOT EXISTS ';
 		}
@@ -274,4 +274,4 @@ class CI_DB_sqlite_forge extends CI_DB_forge {
 }
 
 /* End of file sqlite_forge.php */
-/* Location: ./system/database/drivers/sqlite/sqlite_forge.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/sqlite/sqlite_forge.php */
diff --git a/system/database/drivers/sqlite/sqlite_utility.php b/system/database/drivers/sqlite/sqlite_utility.php
index f00687e38..8fefcd9e2 100644
--- a/system/database/drivers/sqlite/sqlite_utility.php
+++ b/system/database/drivers/sqlite/sqlite_utility.php
@@ -1,13 +1,13 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
  * An open source application development framework for PHP 5.1.6 or newer
  *
  * NOTICE OF LICENSE
- * 
+ *
  * Licensed under the Open Software License version 3.0
- * 
+ *
  * This source file is subject to the Open Software License (OSL 3.0) that is
  * bundled with this package in the files license.txt / license.rst.  It is
  * also available through the world wide web at this URL:
@@ -25,8 +25,6 @@
  * @filesource
  */
 
-// ------------------------------------------------------------------------
-
 /**
  * SQLite Utility Class
  *
@@ -40,20 +38,15 @@ class CI_DB_sqlite_utility extends CI_DB_utility {
 	 * List databases
 	 *
 	 * I don't believe you can do a database listing with SQLite
-	 * since each database is its own file.  I suppose we could
+	 * since each database is its own file. I suppose we could
 	 * try reading a directory looking for SQLite files, but
 	 * that doesn't seem like a terribly good idea
 	 *
-	 * @access	private
 	 * @return	bool
 	 */
-	function _list_databases()
+	public function _list_databases()
 	{
-		if ($this->db_debug)
-		{
-			return $this->db->display_error('db_unsuported_feature');
-		}
-		return array();
+		return ($this->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
 	}
 
 	// --------------------------------------------------------------------
@@ -61,14 +54,12 @@ class CI_DB_sqlite_utility extends CI_DB_utility {
 	/**
 	 * Optimize table query
 	 *
-	 * Is optimization even supported in SQLite?
-	 *
-	 * @access	private
 	 * @param	string	the table name
-	 * @return	object
+	 * @return	bool
 	 */
-	function _optimize_table($table)
+	public function _optimize_table($table)
 	{
+		// Not supported
 		return FALSE;
 	}
 
@@ -77,14 +68,12 @@ class CI_DB_sqlite_utility extends CI_DB_utility {
 	/**
 	 * Repair table query
 	 *
-	 * Are table repairs even supported in SQLite?
-	 *
-	 * @access	private
 	 * @param	string	the table name
-	 * @return	object
+	 * @return	bool
 	 */
-	function _repair_table($table)
+	public function _repair_table($table)
 	{
+		// Not supported
 		return FALSE;
 	}
 
@@ -93,16 +82,16 @@ class CI_DB_sqlite_utility extends CI_DB_utility {
 	/**
 	 * SQLite Export
 	 *
-	 * @access	private
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	function _backup($params = array())
+	public function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');
 	}
+
 }
 
 /* End of file sqlite_utility.php */
-/* Location: ./system/database/drivers/sqlite/sqlite_utility.php */
\ No newline at end of file
+/* Location: ./system/database/drivers/sqlite/sqlite_utility.php */
diff --git a/system/database/drivers/sqlsrv/sqlsrv_driver.php b/system/database/drivers/sqlsrv/sqlsrv_driver.php
index 9c50209ec..5c90cb4f2 100644
--- a/system/database/drivers/sqlsrv/sqlsrv_driver.php
+++ b/system/database/drivers/sqlsrv/sqlsrv_driver.php
@@ -144,22 +144,6 @@ class CI_DB_sqlsrv_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * Set client character set
-	 *
-	 * @access	public
-	 * @param	string
-	 * @param	string
-	 * @return	resource
-	 */
-	function db_set_charset($charset, $collation)
-	{
-		// @todo - add support if needed
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Execute the query
 	 *
 	 * @access	private called by the base class
@@ -333,15 +317,23 @@ class CI_DB_sqlsrv_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	* Version number query string
-	*
-	* @access public
-	* @return string
-	*/
-	function _version()
+	 * Database version number
+	 *
+	 * @return	string
+	 */
+	public function version()
 	{
-		$info = sqlsrv_server_info($this->conn_id);
-		return sprintf("select '%s' as ver", $info['SQLServerVersion']);
+		if (isset($this->data_cache['version']))
+		{
+			return $this->data_cache['version'];
+		}
+
+		if (($info = sqlsrv_server_info($this->conn_id)) === FALSE)
+		{
+			return FALSE;
+		}
+
+		return $this->data_cache['version'] = $info['SQLServerVersion'];
 	}
 
 	// --------------------------------------------------------------------
@@ -422,29 +414,39 @@ class CI_DB_sqlsrv_driver extends CI_DB {
 	// --------------------------------------------------------------------
 
 	/**
-	 * The error message string
+	 * Error
 	 *
-	 * @access	private
-	 * @return	string
+	 * Returns an array containing code and message of the last
+	 * database error that has occured.
+	 *
+	 * @return	array
 	 */
-	function _error_message()
+	public function error()
 	{
-		$error = array_shift(sqlsrv_errors());
-		return !empty($error['message']) ? $error['message'] : null;
-	}
+		$error = array('code' => '00000', 'message' => '');
+		$sqlsrv_errors = sqlsrv_errors(SQLSRV_ERR_ERRORS);
 
-	// --------------------------------------------------------------------
+		if ( ! is_array($sqlsrv_errors))
+		{
+			return $error;
+		}
 
-	/**
-	 * The error message number
-	 *
-	 * @access	private
-	 * @return	integer
-	 */
-	function _error_number()
-	{
-		$error = array_shift(sqlsrv_errors());
-		return isset($error['SQLSTATE']) ? $error['SQLSTATE'] : null;
+		$sqlsrv_error = array_shift($sqlsrv_errors);
+		if (isset($sqlsrv_error['SQLSTATE']))
+		{
+			$error['code'] = isset($sqlsrv_error['code']) ? $sqlsrv_error['SQLSTATE'].'/'.$sqlsrv_error['code'] : $sqlsrv_error['SQLSTATE'];
+		}
+		elseif (isset($sqlsrv_error['code']))
+		{
+			$error['code'] = $sqlsrv_error['code'];
+		}
+
+		if (isset($sqlsrv_error['message']))
+		{
+			$error['message'] = $sqlsrv_error['message'];
+		}
+
+		return $error;
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/helpers/download_helper.php b/system/helpers/download_helper.php
index aea948d81..a8c59c2c0 100644
--- a/system/helpers/download_helper.php
+++ b/system/helpers/download_helper.php
@@ -1,13 +1,13 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
  * An open source application development framework for PHP 5.1.6 or newer
  *
  * NOTICE OF LICENSE
- * 
+ *
  * Licensed under the Open Software License version 3.0
- * 
+ *
  * This source file is subject to the Open Software License (OSL 3.0) that is
  * bundled with this package in the files license.txt / license.rst.  It is
  * also available through the world wide web at this URL:
@@ -25,8 +25,6 @@
  * @filesource
  */
 
-// ------------------------------------------------------------------------
-
 /**
  * CodeIgniter Download Helpers
  *
@@ -47,67 +45,72 @@
  * @access	public
  * @param	string	filename
  * @param	mixed	the data to be downloaded
+ * @param	bool	wether to try and send the actual file MIME type
  * @return	void
  */
 if ( ! function_exists('force_download'))
 {
-	function force_download($filename = '', $data = '')
+	function force_download($filename = '', $data = '', $set_mime = FALSE)
 	{
 		if ($filename == '' OR $data == '')
 		{
 			return FALSE;
 		}
 
-		// Try to determine if the filename includes a file extension.
-		// We need it in order to set the MIME type
-		if (FALSE === strpos($filename, '.'))
+		// Set the default MIME type to send
+		$mime = 'application/octet-stream';
+
+		if ($set_mime === TRUE)
 		{
-			return FALSE;
-		}
+			/* If we're going to detect the MIME type,
+			 * we'll need a file extension.
+			 */
+			if (FALSE === strpos($filename, '.'))
+			{
+				return FALSE;
+			}
 
-		// Grab the file extension
-		$x = explode('.', $filename);
-		$extension = end($x);
+			$extension = explode('.', $filename);
+			$extension = end($extension);
 
-		// Load the mime types
-		if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
-		{
-			include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php');
-		}
-		elseif (is_file(APPPATH.'config/mimes.php'))
-		{
-			include(APPPATH.'config/mimes.php');
-		}
+			// Load the mime types
+			if (defined('ENVIRONMENT') && is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
+			{
+				include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php');
+			}
+			elseif (is_file(APPPATH.'config/mimes.php'))
+			{
+				include(APPPATH.'config/mimes.php');
+			}
 
-		// Set a default mime if we can't find it
-		if ( ! isset($mimes[$extension]))
-		{
-			$mime = 'application/octet-stream';
-		}
-		else
-		{
-			$mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];
+			// Only change the default MIME if we can find one
+			if (isset($mimes[$extension]))
+			{
+				$mime = is_array($mimes[$extension]) ? $mimes[$extension][0] : $mimes[$extension];
+			}
 		}
-		
+
 		// Generate the server headers
 		header('Content-Type: "'.$mime.'"');
 		header('Content-Disposition: attachment; filename="'.$filename.'"');
 		header('Expires: 0');
-		header("Content-Transfer-Encoding: binary");
-		header("Content-Length: ".strlen($data));
-		header('Pragma: no-cache');
+		header('Content-Transfer-Encoding: binary');
+		header('Content-Length: '.strlen($data));
 
-		// Internet Explorer-specific headers.
-		if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], "MSIE") !== FALSE)
+		// Internet Explorer-specific headers
+		if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== FALSE)
 		{
 			header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
 			header('Pragma: public');
 		}
+		else
+		{
+			header('Pragma: no-cache');
+		}
 
 		exit($data);
 	}
 }
 
-
 /* End of file download_helper.php */
-/* Location: ./system/helpers/download_helper.php */
\ No newline at end of file
+/* Location: ./system/helpers/download_helper.php */
diff --git a/system/helpers/text_helper.php b/system/helpers/text_helper.php
index 842a31d75..6e9ea570f 100644
--- a/system/helpers/text_helper.php
+++ b/system/helpers/text_helper.php
@@ -300,9 +300,9 @@ if ( ! function_exists('highlight_code'))
 
 		// Replace any existing PHP tags to temporary markers so they don't accidentally
 		// break the string out of PHP, and thus, thwart the highlighting.
-
 		$str = str_replace(array('<?', '?>', '<%', '%>', '\\', '</script>'),
-							array('phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'), $str);
+					array('phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'),
+					$str);
 
 		// The highlight_string function requires that the text be surrounded
 		// by PHP tags, which we will remove later
@@ -311,25 +311,15 @@ if ( ! function_exists('highlight_code'))
 		// All the magic happens here, baby!
 		$str = highlight_string($str, TRUE);
 
-		// Prior to PHP 5, the highligh function used icky <font> tags
-		// so we'll replace them with <span> tags.
-
-		if (abs(PHP_VERSION) < 5)
-		{
-			$str = str_replace(array('<font ', '</font>'), array('<span ', '</span>'), $str);
-			$str = preg_replace('#color="(.*?)"#', 'style="color: \\1"', $str);
-		}
-
 		// Remove our artificially added PHP, and the syntax highlighting that came with it
 		$str = preg_replace('/<span style="color: #([A-Z0-9]+)">&lt;\?php(&nbsp;| )/i', '<span style="color: #$1">', $str);
 		$str = preg_replace('/(<span style="color: #[A-Z0-9]+">.*?)\?&gt;<\/span>\n<\/span>\n<\/code>/is', "$1</span>\n</span>\n</code>", $str);
 		$str = preg_replace('/<span style="color: #[A-Z0-9]+"\><\/span>/i', '', $str);
 
 		// Replace our markers back to PHP tags.
-		$str = str_replace(array('phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'),
-							array('&lt;?', '?&gt;', '&lt;%', '%&gt;', '\\', '&lt;/script&gt;'), $str);
-
-		return $str;
+		return str_replace(array('phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'),
+					array('&lt;?', '?&gt;', '&lt;%', '%&gt;', '\\', '&lt;/script&gt;'),
+					$str);
 	}
 }
 
@@ -544,4 +534,4 @@ if ( ! function_exists('ellipsize'))
 }
 
 /* End of file text_helper.php */
-/* Location: ./system/helpers/text_helper.php */
\ No newline at end of file
+/* Location: ./system/helpers/text_helper.php */
diff --git a/system/libraries/Email.php b/system/libraries/Email.php
index 922107e9f..8d839d0c9 100644
--- a/system/libraries/Email.php
+++ b/system/libraries/Email.php
@@ -25,8 +25,6 @@
  * @filesource
  */
 
-// ------------------------------------------------------------------------
-
 /**
  * CodeIgniter Email Class
  *
@@ -40,55 +38,55 @@
  */
 class CI_Email {
 
-	public $useragent		= "CodeIgniter";
-	public $mailpath		= "/usr/sbin/sendmail";	// Sendmail path
-	public $protocol		= "mail";	// mail/sendmail/smtp
-	public $smtp_host		= "";		// SMTP Server.  Example: mail.earthlink.net
-	public $smtp_user		= "";		// SMTP Username
-	public $smtp_pass		= "";		// SMTP Password
-	public $smtp_port		= "25";		// SMTP Port
-	public $smtp_timeout	= 5;		// SMTP Timeout in seconds
-	public $smtp_crypto	= "";		// SMTP Encryption. Can be null, tls or ssl.
-	public $wordwrap		= TRUE;		// TRUE/FALSE  Turns word-wrap on/off
-	public $wrapchars		= "76";		// Number of characters to wrap at.
-	public $mailtype		= "text";	// text/html  Defines email formatting
-	public $charset		= "utf-8";	// Default char set: iso-8859-1 or us-ascii
-	public $multipart		= "mixed";	// "mixed" (in the body) or "related" (separate)
-	public $alt_message	= '';		// Alternative message for HTML emails
-	public $validate		= FALSE;	// TRUE/FALSE.  Enables email validation
-	public $priority		= "3";		// Default priority (1 - 5)
-	public $newline		= "\n";		// Default newline. "\r\n" or "\n" (Use "\r\n" to comply with RFC 822)
-	public $crlf			= "\n";		// The RFC 2045 compliant CRLF for quoted-printable is "\r\n".  Apparently some servers,
+	public $useragent	= 'CodeIgniter';
+	public $mailpath	= '/usr/sbin/sendmail';	// Sendmail path
+	public $protocol	= 'mail';		// mail/sendmail/smtp
+	public $smtp_host	= '';			// SMTP Server. Example: mail.earthlink.net
+	public $smtp_user	= '';			// SMTP Username
+	public $smtp_pass	= '';			// SMTP Password
+	public $smtp_port	= 25;			// SMTP Port
+	public $smtp_timeout	= 5;			// SMTP Timeout in seconds
+	public $smtp_crypto	= '';			// SMTP Encryption. Can be null, tls or ssl.
+	public $wordwrap	= TRUE;			// TRUE/FALSE  Turns word-wrap on/off
+	public $wrapchars	= 76;			// Number of characters to wrap at.
+	public $mailtype	= 'text';		// text/html  Defines email formatting
+	public $charset		= 'utf-8';		// Default char set: iso-8859-1 or us-ascii
+	public $multipart	= 'mixed';		// "mixed" (in the body) or "related" (separate)
+	public $alt_message	= '';			// Alternative message for HTML emails
+	public $validate	= FALSE;		// TRUE/FALSE.  Enables email validation
+	public $priority	= 3;			// Default priority (1 - 5)
+	public $newline		= "\n";			// Default newline. "\r\n" or "\n" (Use "\r\n" to comply with RFC 822)
+	public $crlf		= "\n";			// The RFC 2045 compliant CRLF for quoted-printable is "\r\n".  Apparently some servers,
 									// even on the receiving end think they need to muck with CRLFs, so using "\n", while
 									// distasteful, is the only thing that seems to work for all environments.
 	public $send_multipart	= TRUE;		// TRUE/FALSE - Yahoo does not like multipart alternative, so this is an override.  Set to FALSE for Yahoo.
-	public $bcc_batch_mode	= FALSE;	// TRUE/FALSE  Turns on/off Bcc batch feature
+	public $bcc_batch_mode	= FALSE;	// TRUE/FALSE - Turns on/off Bcc batch feature
 	public $bcc_batch_size	= 200;		// If bcc_batch_mode = TRUE, sets max number of Bccs in each batch
-	private $_safe_mode		= FALSE;
-	private $_subject		= "";
-	private $_body			= "";
-	private $_finalbody		= "";
-	private $_alt_boundary	= "";
-	private $_atc_boundary	= "";
-	private $_header_str	= "";
-	private $_smtp_connect	= "";
-	private $_encoding		= "8bit";
-	private $_IP			= FALSE;
-	private $_smtp_auth		= FALSE;
-	private $_replyto_flag	= FALSE;
-	private $_debug_msg		= array();
-	private $_recipients	= array();
-	private $_cc_array		= array();
-	private $_bcc_array		= array();
-	private $_headers		= array();
-	private $_attach_name	= array();
-	private $_attach_type	= array();
-	private $_attach_disp	= array();
-	private $_protocols		= array('mail', 'sendmail', 'smtp');
-	private $_base_charsets	= array('us-ascii', 'iso-2022-');	// 7-bit charsets (excluding language suffix)
-	private $_bit_depths	= array('7bit', '8bit');
-	private $_priorities	= array('1 (Highest)', '2 (High)', '3 (Normal)', '4 (Low)', '5 (Lowest)');
 
+	protected $_safe_mode		= FALSE;
+	protected $_subject		= '';
+	protected $_body		= '';
+	protected $_finalbody		= '';
+	protected $_alt_boundary	= '';
+	protected $_atc_boundary	= '';
+	protected $_header_str		= '';
+	protected $_smtp_connect	= '';
+	protected $_encoding		= '8bit';
+	protected $_IP			= FALSE;
+	protected $_smtp_auth		= FALSE;
+	protected $_replyto_flag	= FALSE;
+	protected $_debug_msg		= array();
+	protected $_recipients		= array();
+	protected $_cc_array		= array();
+	protected $_bcc_array		= array();
+	protected $_headers		= array();
+	protected $_attach_name		= array();
+	protected $_attach_type		= array();
+	protected $_attach_disp		= array();
+	protected $_protocols		= array('mail', 'sendmail', 'smtp');
+	protected $_base_charsets	= array('us-ascii', 'iso-2022-');	// 7-bit charsets (excluding language suffix)
+	protected $_bit_depths		= array('7bit', '8bit');
+	protected $_priorities		= array('1 (Highest)', '2 (High)', '3 (Normal)', '4 (Low)', '5 (Lowest)');
 
 	/**
 	 * Constructor - Sets Email Preferences
@@ -103,11 +101,11 @@ class CI_Email {
 		}
 		else
 		{
-			$this->_smtp_auth = ($this->smtp_user == '' AND $this->smtp_pass == '') ? FALSE : TRUE;
-			$this->_safe_mode = (bool) @ini_get("safe_mode");
+			$this->_smtp_auth = ! ($this->smtp_user == '' && $this->smtp_pass == '');
+			$this->_safe_mode = (bool) @ini_get('safe_mode');
 		}
 
-		log_message('debug', "Email Class Initialized");
+		log_message('debug', 'Email Class Initialized');
 	}
 
 	// --------------------------------------------------------------------
@@ -115,7 +113,6 @@ class CI_Email {
 	/**
 	 * Initialize preferences
 	 *
-	 * @access	public
 	 * @param	array
 	 * @return	void
 	 */
@@ -139,8 +136,8 @@ class CI_Email {
 		}
 		$this->clear();
 
-		$this->_smtp_auth = ($this->smtp_user == '' AND $this->smtp_pass == '') ? FALSE : TRUE;
-		$this->_safe_mode = (bool) @ini_get("safe_mode");
+		$this->_smtp_auth = ! ($this->smtp_user == '' && $this->smtp_pass == '');
+		$this->_safe_mode = (bool) @ini_get('safe_mode');
 
 		return $this;
 	}
@@ -150,17 +147,16 @@ class CI_Email {
 	/**
 	 * Initialize the Email Data
 	 *
-	 * @access	public
 	 * @param	bool
-	 * @return	void
+	 * @return	object
 	 */
 	public function clear($clear_attachments = FALSE)
 	{
-		$this->_subject		= "";
-		$this->_body		= "";
-		$this->_finalbody	= "";
-		$this->_header_str	= "";
-		$this->_replyto_flag = FALSE;
+		$this->_subject		= '';
+		$this->_body		= '';
+		$this->_finalbody	= '';
+		$this->_header_str	= '';
+		$this->_replyto_flag	= FALSE;
 		$this->_recipients	= array();
 		$this->_cc_array	= array();
 		$this->_bcc_array	= array();
@@ -185,14 +181,13 @@ class CI_Email {
 	/**
 	 * Set FROM
 	 *
-	 * @access	public
 	 * @param	string
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function from($from, $name = '')
 	{
-		if (preg_match( '/\<(.*)\>/', $from, $match))
+		if (preg_match('/\<(.*)\>/', $from, $match))
 		{
 			$from = $match[1];
 		}
@@ -228,14 +223,13 @@ class CI_Email {
 	/**
 	 * Set Reply-to
 	 *
-	 * @access	public
 	 * @param	string
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function reply_to($replyto, $name = '')
 	{
-		if (preg_match( '/\<(.*)\>/', $replyto, $match))
+		if (preg_match('/\<(.*)\>/', $replyto, $match))
 		{
 			$replyto = $match[1];
 		}
@@ -266,9 +260,8 @@ class CI_Email {
 	/**
 	 * Set Recipients
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function to($to)
 	{
@@ -282,17 +275,17 @@ class CI_Email {
 
 		if ($this->_get_protocol() !== 'mail')
 		{
-			$this->_set_header('To', implode(", ", $to));
+			$this->_set_header('To', implode(', ', $to));
 		}
 
 		switch ($this->_get_protocol())
 		{
-			case 'smtp'		:
+			case 'smtp':
 				$this->_recipients = $to;
 			break;
-			case 'sendmail'	:
-			case 'mail'		:
-				$this->_recipients = implode(", ", $to);
+			case 'sendmail':
+			case 'mail':
+				$this->_recipients = implode(', ', $to);
 			break;
 		}
 
@@ -304,9 +297,8 @@ class CI_Email {
 	/**
 	 * Set CC
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function cc($cc)
 	{
@@ -318,7 +310,7 @@ class CI_Email {
 			$this->validate_email($cc);
 		}
 
-		$this->_set_header('Cc', implode(", ", $cc));
+		$this->_set_header('Cc', implode(', ', $cc));
 
 		if ($this->_get_protocol() === 'smtp')
 		{
@@ -333,10 +325,9 @@ class CI_Email {
 	/**
 	 * Set BCC
 	 *
-	 * @access	public
 	 * @param	string
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function bcc($bcc, $limit = '')
 	{
@@ -360,7 +351,7 @@ class CI_Email {
 		}
 		else
 		{
-			$this->_set_header('Bcc', implode(", ", $bcc));
+			$this->_set_header('Bcc', implode(', ', $bcc));
 		}
 
 		return $this;
@@ -371,9 +362,8 @@ class CI_Email {
 	/**
 	 * Set Email Subject
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function subject($subject)
 	{
@@ -387,13 +377,12 @@ class CI_Email {
 	/**
 	 * Set Body
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function message($body)
 	{
-		$this->_body = rtrim(str_replace("\r", "", $body));
+		$this->_body = rtrim(str_replace("\r", '', $body));
 
 		/* strip slashes only if magic quotes is ON
 		   if we do it with magic quotes OFF, it strips real, user-inputted chars.
@@ -414,9 +403,8 @@ class CI_Email {
 	/**
 	 * Assign file attachments
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function attach($filename, $disposition = '', $newname = NULL)
 	{
@@ -431,7 +419,6 @@ class CI_Email {
 	/**
 	 * Add a Header Item
 	 *
-	 * @access	protected
 	 * @param	string
 	 * @param	string
 	 * @return	void
@@ -446,7 +433,6 @@ class CI_Email {
 	/**
 	 * Convert a String to an Array
 	 *
-	 * @access	protected
 	 * @param	string
 	 * @return	array
 	 */
@@ -460,8 +446,7 @@ class CI_Email {
 			}
 			else
 			{
-				$email = trim($email);
-				settype($email, "array");
+				$email = (array) trim($email);
 			}
 		}
 		return $email;
@@ -472,9 +457,8 @@ class CI_Email {
 	/**
 	 * Set Multipart Value
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function set_alt_message($str = '')
 	{
@@ -487,9 +471,8 @@ class CI_Email {
 	/**
 	 * Set Mailtype
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function set_mailtype($type = 'text')
 	{
@@ -502,9 +485,8 @@ class CI_Email {
 	/**
 	 * Set Wordwrap
 	 *
-	 * @access	public
 	 * @param	bool
-	 * @return	void
+	 * @return	object
 	 */
 	public function set_wordwrap($wordwrap = TRUE)
 	{
@@ -517,13 +499,12 @@ class CI_Email {
 	/**
 	 * Set Protocol
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function set_protocol($protocol = 'mail')
 	{
-		$this->protocol = ( ! in_array($protocol, $this->_protocols, TRUE)) ? 'mail' : strtolower($protocol);
+		$this->protocol = in_array($protocol, $this->_protocols, TRUE) ? strtolower($protocol) : 'mail';
 		return $this;
 	}
 
@@ -532,19 +513,12 @@ class CI_Email {
 	/**
 	 * Set Priority
 	 *
-	 * @access	public
-	 * @param	integer
-	 * @return	void
+	 * @param	int
+	 * @return	object
 	 */
 	public function set_priority($n = 3)
 	{
-		if ( ! is_numeric($n) OR $n < 1 OR $n > 5)
-		{
-			$this->priority = 3;
-			return;
-		}
-
-		$this->priority = (int) $n;
+		$this->priority = preg_match('/^[1-5]$/', $n) ? (int) $n : 3;
 		return $this;
 	}
 
@@ -553,9 +527,8 @@ class CI_Email {
 	/**
 	 * Set Newline Character
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function set_newline($newline = "\n")
 	{
@@ -568,13 +541,12 @@ class CI_Email {
 	/**
 	 * Set CRLF
 	 *
-	 * @access	public
 	 * @param	string
-	 * @return	void
+	 * @return	object
 	 */
 	public function set_crlf($crlf = "\n")
 	{
-		$this->crlf = ($crlf !== "\n" AND $crlf !== "\r\n" AND $crlf !== "\r") ? "\n" : $crlf;
+		$this->crlf = ($crlf !== "\n" && $crlf !== "\r\n" && $crlf !== "\r") ? "\n" : $crlf;
 		return $this;
 	}
 
@@ -583,13 +555,12 @@ class CI_Email {
 	/**
 	 * Set Message Boundary
 	 *
-	 * @access	protected
 	 * @return	void
 	 */
 	protected function _set_boundaries()
 	{
-		$this->_alt_boundary = "B_ALT_".uniqid(''); // multipart/alternative
-		$this->_atc_boundary = "B_ATC_".uniqid(''); // attachment boundary
+		$this->_alt_boundary = 'B_ALT_'.uniqid(''); // multipart/alternative
+		$this->_atc_boundary = 'B_ATC_'.uniqid(''); // attachment boundary
 	}
 
 	// --------------------------------------------------------------------
@@ -597,14 +568,12 @@ class CI_Email {
 	/**
 	 * Get the Message ID
 	 *
-	 * @access	protected
 	 * @return	string
 	 */
 	protected function _get_message_id()
 	{
 		$from = str_replace(array('>', '<'), '', $this->_headers['Return-Path']);
-
-		return  "<".uniqid('').strstr($from, '@').">";
+		return  '<'.uniqid('').strstr($from, '@').'>';
 	}
 
 	// --------------------------------------------------------------------
@@ -612,14 +581,13 @@ class CI_Email {
 	/**
 	 * Get Mail Protocol
 	 *
-	 * @access	protected
 	 * @param	bool
-	 * @return	string
+	 * @return	mixed
 	 */
 	protected function _get_protocol($return = TRUE)
 	{
 		$this->protocol = strtolower($this->protocol);
-		$this->protocol = ( ! in_array($this->protocol, $this->_protocols, TRUE)) ? 'mail' : $this->protocol;
+		in_array($this->protocol, $this->_protocols, TRUE) OR $this->protocol = 'mail';
 
 		if ($return == TRUE)
 		{
@@ -632,13 +600,12 @@ class CI_Email {
 	/**
 	 * Get Mail Encoding
 	 *
-	 * @access	protected
 	 * @param	bool
 	 * @return	string
 	 */
 	protected function _get_encoding($return = TRUE)
 	{
-		$this->_encoding = ( ! in_array($this->_encoding, $this->_bit_depths)) ? '8bit' : $this->_encoding;
+		in_array($this->_encoding, $this->_bit_depths) OR $this->_encoding = '8bit';
 
 		foreach ($this->_base_charsets as $charset)
 		{
@@ -659,7 +626,6 @@ class CI_Email {
 	/**
 	 * Get content type (text/html/attachment)
 	 *
-	 * @access	protected
 	 * @return	string
 	 */
 	protected function _get_content_type()
@@ -687,17 +653,16 @@ class CI_Email {
 	/**
 	 * Set RFC 822 Date
 	 *
-	 * @access	protected
 	 * @return	string
 	 */
 	protected function _set_date()
 	{
-		$timezone = date("Z");
+		$timezone = date('Z');
 		$operator = (strncmp($timezone, '-', 1) === 0) ? '-' : '+';
 		$timezone = abs($timezone);
 		$timezone = floor($timezone/3600) * 100 + ($timezone % 3600) / 60;
 
-		return sprintf("%s %s%04d", date("D, j M Y H:i:s"), $operator, $timezone);
+		return sprintf('%s %s%04d', date('D, j M Y H:i:s'), $operator, $timezone);
 	}
 
 	// --------------------------------------------------------------------
@@ -705,12 +670,11 @@ class CI_Email {
 	/**
 	 * Mime message
 	 *
-	 * @access	protected
 	 * @return	string
 	 */
 	protected function _get_mime_message()
 	{
-		return "This is a multi-part message in MIME format.".$this->newline."Your email application may not support this format.";
+		return 'This is a multi-part message in MIME format.'.$this->newline.'Your email application may not support this format.';
 	}
 
 	// --------------------------------------------------------------------
@@ -718,7 +682,6 @@ class CI_Email {
 	/**
 	 * Validate Email Address
 	 *
-	 * @access	public
 	 * @param	string
 	 * @return	bool
 	 */
@@ -747,13 +710,12 @@ class CI_Email {
 	/**
 	 * Email Validation
 	 *
-	 * @access	public
 	 * @param	string
 	 * @return	bool
 	 */
 	public function valid_email($address)
 	{
-		return (bool) preg_match("/^([a-z0-9\+_\-]+)(\.[a-z0-9\+_\-]+)*@([a-z0-9\-]+\.)+[a-z]{2,6}$/ix", $address);
+		return (bool) preg_match('/^([a-z0-9\+_\-]+)(\.[a-z0-9\+_\-]+)*@([a-z0-9\-]+\.)+[a-z]{2,6}$/ix', $address);
 	}
 
 	// --------------------------------------------------------------------
@@ -761,7 +723,6 @@ class CI_Email {
 	/**
 	 * Clean Extended Email Address: Joe Smith <joe@smith.com>
 	 *
-	 * @access	public
 	 * @param	string
 	 * @return	string
 	 */
@@ -776,7 +737,7 @@ class CI_Email {
 
 		foreach ($email as $addy)
 		{
-			$clean_email[] = (preg_match( '/\<(.*)\>/', $addy, $match)) ? $match[1] : $addy;
+			$clean_email[] = preg_match('/\<(.*)\>/', $addy, $match) ? $match[1] : $addy;
 		}
 
 		return $clean_email;
@@ -792,12 +753,11 @@ class CI_Email {
 	 * If the user hasn't specified his own alternative message
 	 * it creates one by stripping the HTML
 	 *
-	 * @access	protected
 	 * @return	string
 	 */
 	protected function _get_alt_message()
 	{
-		if ($this->alt_message != "")
+		if ($this->alt_message != '')
 		{
 			return $this->word_wrap($this->alt_message, '76');
 		}
@@ -818,9 +778,8 @@ class CI_Email {
 	/**
 	 * Word Wrap
 	 *
-	 * @access	public
 	 * @param	string
-	 * @param	integer
+	 * @param	int
 	 * @return	string
 	 */
 	public function word_wrap($str, $charlim = '')
@@ -911,8 +870,6 @@ class CI_Email {
 	/**
 	 * Build final headers
 	 *
-	 * @access	protected
-	 * @param	string
 	 * @return	string
 	 */
 	protected function _build_headers()
@@ -929,7 +886,6 @@ class CI_Email {
 	/**
 	 * Write Headers as a string
 	 *
-	 * @access	protected
 	 * @return	void
 	 */
 	protected function _write_headers()
@@ -964,12 +920,11 @@ class CI_Email {
 	/**
 	 * Build Final Body and attachments
 	 *
-	 * @access	protected
 	 * @return	void
 	 */
 	protected function _build_message()
 	{
-		if ($this->wordwrap === TRUE AND $this->mailtype !== 'html')
+		if ($this->wordwrap === TRUE && $this->mailtype !== 'html')
 		{
 			$this->_body = $this->word_wrap($this->_body);
 		}
@@ -1131,9 +1086,8 @@ class CI_Email {
 	 * Prepares string for Quoted-Printable Content-Transfer-Encoding
 	 * Refer to RFC 2045 http://www.ietf.org/rfc/rfc2045.txt
 	 *
-	 * @access	protected
 	 * @param	string
-	 * @param	integer
+	 * @param	int
 	 * @return	string
 	 */
 	protected function _prep_quoted_printable($str, $charlim = '')
@@ -1203,9 +1157,7 @@ class CI_Email {
 		}
 
 		// get rid of extra CRLF tacked onto the end
-		$output = substr($output, 0, strlen($this->crlf) * -1);
-
-		return $output;
+		return substr($output, 0, strlen($this->crlf) * -1);
 	}
 
 	// --------------------------------------------------------------------
@@ -1216,10 +1168,9 @@ class CI_Email {
 	 * Performs "Q Encoding" on a string for use in email headers.  It's related
 	 * but not identical to quoted-printable, so it has its own method
 	 *
-	 * @access	public
-	 * @param	str
-	 * @param	bool	// set to TRUE for processing From: headers
-	 * @return	str
+	 * @param	string
+	 * @param	bool	set to TRUE for processing From: headers
+	 * @return	string
 	 */
 	protected function _prep_q_encoding($str, $from = FALSE)
 	{
@@ -1275,9 +1226,7 @@ class CI_Email {
 
 		// wrap each line with the shebang, charset, and transfer encoding
 		// the preceding space on successive lines is required for header "folding"
-		$str = trim(preg_replace('/^(.*)$/m', ' =?'.$this->charset.'?Q?$1?=', $str));
-
-		return $str;
+		return trim(preg_replace('/^(.*)$/m', ' =?'.$this->charset.'?Q?$1?=', $str));
 	}
 
 	// --------------------------------------------------------------------
@@ -1285,7 +1234,6 @@ class CI_Email {
 	/**
 	 * Send Email
 	 *
-	 * @access	public
 	 * @return	bool
 	 */
 	public function send()
@@ -1295,9 +1243,9 @@ class CI_Email {
 			$this->reply_to($this->_headers['From']);
 		}
 
-		if (( ! isset($this->_recipients) AND ! isset($this->_headers['To']))  AND
-			( ! isset($this->_bcc_array) AND ! isset($this->_headers['Bcc'])) AND
-			( ! isset($this->_headers['Cc'])))
+		if ( ! isset($this->_recipients) && ! isset($this->_headers['To'])
+			&& ! isset($this->_bcc_array) && ! isset($this->_headers['Bcc'])
+			&& ! isset($this->_headers['Cc']))
 		{
 			$this->_set_error_message('lang:email_no_recipients');
 			return FALSE;
@@ -1305,44 +1253,40 @@ class CI_Email {
 
 		$this->_build_headers();
 
-		if ($this->bcc_batch_mode AND count($this->_bcc_array) > $this->bcc_batch_size)
+		if ($this->bcc_batch_mode && count($this->_bcc_array) > $this->bcc_batch_size)
 		{
 			return $this->batch_bcc_send();
 		}
 
 		$this->_build_message();
-
 		return $this->_spool_email();
 	}
 
 	// --------------------------------------------------------------------
 
 	/**
-	 * Batch Bcc Send.  Sends groups of BCCs in batches
+	 * Batch Bcc Send. Sends groups of BCCs in batches
 	 *
-	 * @access	public
-	 * @return	bool
+	 * @return	void
 	 */
 	public function batch_bcc_send()
 	{
-		$float = $this->bcc_batch_size -1;
-
-		$set = "";
-
+		$float = $this->bcc_batch_size - 1;
+		$set = '';
 		$chunk = array();
 
 		for ($i = 0, $c = count($this->_bcc_array); $i < $c; $i++)
 		{
 			if (isset($this->_bcc_array[$i]))
 			{
-				$set .= ", ".$this->_bcc_array[$i];
+				$set .= ', '.$this->_bcc_array[$i];
 			}
 
 			if ($i == $float)
 			{
 				$chunk[] = substr($set, 1);
 				$float += $this->bcc_batch_size;
-				$set = "";
+				$set = '';
 			}
 
 			if ($i === $c-1)
@@ -1359,7 +1303,7 @@ class CI_Email {
 
 			if ($this->protocol !== 'smtp')
 			{
-				$this->_set_header('Bcc', implode(", ", $bcc));
+				$this->_set_header('Bcc', implode(', ', $bcc));
 			}
 			else
 			{
@@ -1376,7 +1320,6 @@ class CI_Email {
 	/**
 	 * Unwrap special elements
 	 *
-	 * @access	protected
 	 * @return	void
 	 */
 	protected function _unwrap_specials()
@@ -1389,7 +1332,6 @@ class CI_Email {
 	/**
 	 * Strip line-breaks via callback
 	 *
-	 * @access	protected
 	 * @return	string
 	 */
 	protected function _remove_nl_callback($matches)
@@ -1407,7 +1349,6 @@ class CI_Email {
 	/**
 	 * Spool mail to the mail server
 	 *
-	 * @access	protected
 	 * @return	bool
 	 */
 	protected function _spool_email()
@@ -1418,6 +1359,7 @@ class CI_Email {
 		if ( ! $this->$method())
 		{
 			$this->_set_error_message('lang:email_send_failure_' . ($this->_get_protocol() === 'mail' ? 'phpmail' : $this->_get_protocol()));
+			return FALSE;
 		}
 
 		$this->_set_error_message('lang:email_sent', $this->_get_protocol());
@@ -1429,7 +1371,6 @@ class CI_Email {
 	/**
 	 * Send using mail()
 	 *
-	 * @access	protected
 	 * @return	bool
 	 */
 	protected function _send_with_mail()
@@ -1451,7 +1392,6 @@ class CI_Email {
 	/**
 	 * Send using Sendmail
 	 *
-	 * @access	protected
 	 * @return	bool
 	 */
 	protected function _send_with_sendmail()
@@ -1484,7 +1424,6 @@ class CI_Email {
 	/**
 	 * Send using SMTP
 	 *
-	 * @access	protected
 	 * @return	bool
 	 */
 	protected function _send_with_smtp()
@@ -1495,8 +1434,10 @@ class CI_Email {
 			return FALSE;
 		}
 
-		$this->_smtp_connect();
-		$this->_smtp_authenticate();
+		if ( ! $this->_smtp_connect() OR ! $this->_smtp_authenticate())
+		{
+			return FALSE;
+		}
 
 		$this->_send_command('from', $this->clean_email($this->_headers['From']));
 
@@ -1553,7 +1494,6 @@ class CI_Email {
 	/**
 	 * SMTP Connect
 	 *
-	 * @access	protected
 	 * @param	string
 	 * @return	string
 	 */
@@ -1597,7 +1537,6 @@ class CI_Email {
 	/**
 	 * Send SMTP command
 	 *
-	 * @access	protected
 	 * @param	string
 	 * @param	string
 	 * @return	string
@@ -1670,7 +1609,6 @@ class CI_Email {
 	/**
 	 *  SMTP Authenticate
 	 *
-	 * @access	protected
 	 * @return	bool
 	 */
 	protected function _smtp_authenticate()
@@ -1680,7 +1618,7 @@ class CI_Email {
 			return TRUE;
 		}
 
-		if ($this->smtp_user == ""  AND  $this->smtp_pass == "")
+		if ($this->smtp_user == '' && $this->smtp_pass == '')
 		{
 			$this->_set_error_message('lang:email_no_smtp_unpw');
 			return FALSE;
@@ -1724,7 +1662,6 @@ class CI_Email {
 	/**
 	 * Send SMTP data
 	 *
-	 * @access	protected
 	 * @return	bool
 	 */
 	protected function _send_data($data)
@@ -1743,7 +1680,6 @@ class CI_Email {
 	/**
 	 * Get SMTP data
 	 *
-	 * @access	protected
 	 * @return	string
 	 */
 	protected function _get_smtp_data()
@@ -1768,12 +1704,11 @@ class CI_Email {
 	/**
 	 * Get Hostname
 	 *
-	 * @access	protected
 	 * @return	string
 	 */
 	protected function _get_hostname()
 	{
-		return (isset($_SERVER['SERVER_NAME'])) ? $_SERVER['SERVER_NAME'] : 'localhost.localdomain';
+		return isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : 'localhost.localdomain';
 	}
 
 	// --------------------------------------------------------------------
@@ -1781,7 +1716,6 @@ class CI_Email {
 	/**
 	 * Get IP
 	 *
-	 * @access	protected
 	 * @return	string
 	 */
 	protected function _get_ip()
@@ -1791,13 +1725,13 @@ class CI_Email {
 			return $this->_IP;
 		}
 
-		$cip = (isset($_SERVER['HTTP_CLIENT_IP']) AND $_SERVER['HTTP_CLIENT_IP'] != "") ? $_SERVER['HTTP_CLIENT_IP'] : FALSE;
-		$rip = (isset($_SERVER['REMOTE_ADDR']) AND $_SERVER['REMOTE_ADDR'] != "") ? $_SERVER['REMOTE_ADDR'] : FALSE;
+		$cip = ( ! empty($_SERVER['HTTP_CLIENT_IP'])) ? $_SERVER['HTTP_CLIENT_IP'] : FALSE;
+		$rip = ( ! empty($_SERVER['REMOTE_ADDR'])) ? $_SERVER['REMOTE_ADDR'] : FALSE;
 		if ($cip) $this->_IP = $cip;
 		elseif ($rip) $this->_IP = $rip;
 		else
 		{
-			$fip = (isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND $_SERVER['HTTP_X_FORWARDED_FOR'] != "") ? $_SERVER['HTTP_X_FORWARDED_FOR'] : FALSE;
+			$fip = ( ! empty($_SERVER['HTTP_X_FORWARDED_FOR'])) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : FALSE;
 			if ($fip)
 			{
 				$this->_IP = $fip;
@@ -1810,7 +1744,7 @@ class CI_Email {
 			$this->_IP = end($x);
 		}
 
-		if ( ! preg_match( "/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/", $this->_IP))
+		if ( ! preg_match('/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/', $this->_IP))
 		{
 			$this->_IP = '0.0.0.0';
 		}
@@ -1823,7 +1757,6 @@ class CI_Email {
 	/**
 	 * Get Debug Message
 	 *
-	 * @access	public
 	 * @return	string
 	 */
 	public function print_debugger()
@@ -1838,8 +1771,7 @@ class CI_Email {
 			}
 		}
 
-		$msg .= "<pre>".$this->_header_str."\n".htmlspecialchars($this->_subject)."\n".htmlspecialchars($this->_finalbody).'</pre>';
-		return $msg;
+		return $msg.'<pre>'.$this->_header_str."\n".htmlspecialchars($this->_subject)."\n".htmlspecialchars($this->_finalbody).'</pre>';
 	}
 
 	// --------------------------------------------------------------------
@@ -1847,16 +1779,15 @@ class CI_Email {
 	/**
 	 * Set Message
 	 *
-	 * @access	protected
 	 * @param	string
-	 * @return	string
+	 * @return	void
 	 */
 	protected function _set_error_message($msg, $val = '')
 	{
 		$CI =& get_instance();
 		$CI->lang->load('email');
 
-		if (substr($msg, 0, 5) !== 'lang:' || FALSE === ($line = $CI->lang->line(substr($msg, 5))))
+		if (substr($msg, 0, 5) !== 'lang:' OR FALSE === ($line = $CI->lang->line(substr($msg, 5))))
 		{
 			$this->_debug_msg[] = str_replace('%s', $val, $msg)."<br />";
 		}
@@ -1871,13 +1802,13 @@ class CI_Email {
 	/**
 	 * Mime Types
 	 *
-	 * @access	protected
 	 * @param	string
 	 * @return	string
 	 */
-	protected function _mime_types($ext = "")
+	protected function _mime_types($ext = '')
 	{
-		$mimes = array(	'hqx'	=>	'application/mac-binhex40',
+		$mimes = array(
+						'hqx'	=>	'application/mac-binhex40',
 						'cpt'	=>	'application/mac-compactpro',
 						'doc'	=>	'application/msword',
 						'bin'	=>	'application/macbinary',
@@ -1966,11 +1897,10 @@ class CI_Email {
 						'eml'	=>	'message/rfc822'
 					);
 
-		return ( ! isset($mimes[strtolower($ext)])) ? "application/x-unknown-content-type" : $mimes[strtolower($ext)];
+		return isset($mimes[strtolower($ext)]) ? $mimes[strtolower($ext)] : 'application/x-unknown-content-type';
 	}
 
 }
-// END CI_Email class
 
 /* End of file Email.php */
 /* Location: ./system/libraries/Email.php */
diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index 2ee734ae6..5069a44c1 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -235,6 +235,20 @@ class CI_Form_validation {
 	// --------------------------------------------------------------------
 
 	/**
+	 * Get Array of Error Messages
+	 *
+	 * Returns the error messages as an array
+	 *
+	 * @return	array
+	 */
+	public function error_array()
+	{
+		return $this->_error_array;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
 	 * Error String
 	 *
 	 * Returns the error messages as a string, wrapped in the error delimiters
diff --git a/system/libraries/Profiler.php b/system/libraries/Profiler.php
index 89c616543..04216be5d 100644
--- a/system/libraries/Profiler.php
+++ b/system/libraries/Profiler.php
@@ -270,7 +270,7 @@ class CI_Profiler {
 				}
 
 				$output .= "<tr><td style='width:50%;color:#000;background-color:#ddd;padding:5px'>&#36;_GET[".$key."]&nbsp;&nbsp; </td><td style='width:50%;padding:5px;color:#cd6e00;font-weight:normal;background-color:#ddd;'>"
-					. (is_array($val) ? "<pre>" . htmlspecialchars(stripslashes(print_r($val, true))) . "</pre>" : htmlspecialchars(stripslashes($val)))
+					. ((is_array($val) OR is_object($val)) ? "<pre>" . htmlspecialchars(stripslashes(print_r($val, true))) . "</pre>" : htmlspecialchars(stripslashes($val)))
 					. "</td></tr>\n";
 			}
 
@@ -311,7 +311,7 @@ class CI_Profiler {
 				}
 
 				$output .= "<tr><td style='width:50%;padding:5px;color:#000;background-color:#ddd;'>&#36;_POST[".$key."]&nbsp;&nbsp; </td><td style='width:50%;padding:5px;color:#009900;font-weight:normal;background-color:#ddd;'>";
-				if (is_array($val))
+				if (is_array($val) OR is_object($val))
 				{
 					$output .= "<pre>" . htmlspecialchars(stripslashes(print_r($val, TRUE))) . "</pre>";
 				}
@@ -426,9 +426,9 @@ class CI_Profiler {
 			. '<legend style="color:#000;">&nbsp;&nbsp;'.$this->CI->lang->line('profiler_config').'&nbsp;&nbsp;(<span style="cursor: pointer;" onclick="var s=document.getElementById(\'ci_profiler_config_table\').style;s.display=s.display==\'none\'?\'\':\'none\';this.innerHTML=this.innerHTML==\''.$this->CI->lang->line('profiler_section_show').'\'?\''.$this->CI->lang->line('profiler_section_hide').'\':\''.$this->CI->lang->line('profiler_section_show').'\';">'.$this->CI->lang->line('profiler_section_show').'</span>)</legend>'
 			. "\n\n\n<table style='width:100%; display:none' id='ci_profiler_config_table'>\n";
 
-		foreach ($this->CI->config->config as $config=>$val)
+		foreach ($this->CI->config->config as $config => $val)
 		{
-			if (is_array($val))
+			if (is_array($val) OR is_object($val))
 			{
 				$val = print_r($val, TRUE);
 			}
@@ -459,7 +459,7 @@ class CI_Profiler {
 
 		foreach ($this->CI->session->all_userdata() as $key => $val)
 		{
-			if (is_array($val) || is_object($val))
+			if (is_array($val) OR is_object($val))
 			{
 				$val = print_r($val, TRUE);
 			}
@@ -501,7 +501,5 @@ class CI_Profiler {
 	}
 }
 
-// END CI_Profiler class
-
 /* End of file Profiler.php */
 /* Location: ./system/libraries/Profiler.php */
diff --git a/system/libraries/Session.php b/system/libraries/Session.php
index 66b39a6a2..dd50a91e1 100644
--- a/system/libraries/Session.php
+++ b/system/libraries/Session.php
@@ -219,7 +219,7 @@ class CI_Session {
 				$this->CI->db->where('user_agent', $session['user_agent']);
 			}
 
-			$query = $this->CI->db->get($this->sess_table_name);
+			$query = $this->CI->db->limit(1)->get($this->sess_table_name);
 
 			// No result? Kill it!
 			if ($query->num_rows() === 0)
diff --git a/system/libraries/Upload.php b/system/libraries/Upload.php
index 545c92ff3..89575c849 100644
--- a/system/libraries/Upload.php
+++ b/system/libraries/Upload.php
@@ -1,4 +1,4 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
@@ -593,16 +593,17 @@ class CI_Upload {
 	/**
 	 * Verify that the filetype is allowed
 	 *
+	 * @param	bool
 	 * @return	bool
 	 */
 	public function is_allowed_filetype($ignore_mime = FALSE)
 	{
-		if ($this->allowed_types == '*')
+		if ($this->allowed_types === '*')
 		{
 			return TRUE;
 		}
 
-		if (count($this->allowed_types) == 0 OR ! is_array($this->allowed_types))
+		if ( ! is_array($this->allowed_types) OR count($this->allowed_types) === 0)
 		{
 			$this->set_error('upload_no_file_types');
 			return FALSE;
@@ -618,12 +619,9 @@ class CI_Upload {
 		// Images get some additional checks
 		$image_types = array('gif', 'jpg', 'jpeg', 'png', 'jpe');
 
-		if (in_array($ext, $image_types))
+		if (in_array($ext, $image_types) && @getimagesize($this->file_temp) === FALSE)
 		{
-			if (getimagesize($this->file_temp) === FALSE)
-			{
-				return FALSE;
-			}
+			return FALSE;
 		}
 
 		if ($ignore_mime === TRUE)
@@ -640,7 +638,7 @@ class CI_Upload {
 				return TRUE;
 			}
 		}
-		elseif ($mime == $this->file_type)
+		elseif ($mime === $this->file_type)
 		{
 				return TRUE;
 		}
@@ -960,7 +958,7 @@ class CI_Upload {
 			}
 			elseif (is_file(APPPATH.'config/mimes.php'))
 			{
-				include(APPPATH.'config//mimes.php');
+				include(APPPATH.'config/mimes.php');
 			}
 			else
 			{
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 0f400d9a0..2ada9ee67 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -28,6 +28,7 @@ Release Date: Not Released
    -  Added support for 3gp, 3g2, mp4, wmv, f4v, vlc Video files to mimes.php.
    -  Added support for m4a, aac, m4u, xspf, au, ac3, flac, ogg Audio files to mimes.php.
    -  Added support for kmz and kml (Google Earth) files to mimes.php.
+   -  Updated support for doc files in mimes.php.
    -  Added application/xml for xml and application/xml, text/xsl for xsl in mimes.php.
    -  Changed logger to only chmod when file is first created.
    -  Removed previously deprecated SHA1 Library.
@@ -39,8 +40,8 @@ Release Date: Not Released
    -  url_title() will now trim extra dashes from beginning and end.
    -  Added XHTML Basic 1.1 doctype to :doc:`HTML Helper <helpers/html_helper>`.
    -  Changed humanize to include a second param for the separator.
-   -  Refactored ``plural()`` and ``singular()`` to avoid double pluralization and 
-support more words.
+   -  Refactored ``plural()`` and ``singular()`` to avoid double pluralization and support more words.
+   -  Added an optional third parameter to ``force_download()`` that enables/disables sending the actual file MIME type in the Content-Type header (disabled by default).
 
 -  Database
 
@@ -53,7 +54,14 @@ support more words.
    -  MySQLi driver now supports persistent connections when running on PHP >= 5.3.
    -  Added dsn if the group connections in the config use PDO or any driver which need DSN.
    -  Improved PDO database support.
-   -  An optional database name parameter was added db_select().
+   -  Added Interbase/Firebird database support via the "interbase" driver
+   -  Added an optional database name parameter to db_select().
+   -  Replaced the _error_message() and _error_number() methods with error(), that returns an array containing the last database error code and message.
+   -  Improved version() implementation so that drivers that have a native function to get the version number don't have to be defined in the core DB_driver class.
+   -  Improved support of the PostgreSQL driver, including:
+	 -  pg_version() is now used to get the database version number, when possible.
+	 -  Added db_set_charset() support.
+	 -  Added _optimize_table() support for the :doc:`Database Utility Class <database/utilities>` (rebuilds table indexes).
 
 -  Libraries
 
@@ -74,6 +82,8 @@ support more words.
    -  Minor speed optimizations and method & property visibility declarations in the Calendar Library.
    -  Removed SHA1 function in the :doc:`Encryption Library <libraries/encryption>`.
    -  Added $config['csrf_regeneration'] to the CSRF protection in the :doc:`Security library <libraries/security>`, which makes token regeneration optional.
+   -  Added function error_array() to return all error messages as an array in the Form_validation class.
+   -  Changed the Session library to select only one row when using database sessions.
 
 -  Core
 
@@ -86,8 +96,7 @@ Bug fixes for 3.0
 ------------------
 
 -  Unlink raised an error if cache file did not exist when you try to delete it.
--  Fixed a bug (#181) where a mis-spelling was in the form validation
-   language file.
+-  Fixed a bug (#181) where a mis-spelling was in the form validation language file.
 -  Fixed a bug (#159, #163) that mishandled Active Record nested transactions because _trans_depth was not getting incremented.
 -  Fixed a bug (#737, #75) where pagination anchor class was not set properly when using initialize method.
 -  Fixed a bug (#419) - auto_link() now recognizes URLs that come after a word boundary.
@@ -111,7 +120,21 @@ Bug fixes for 3.0
 -  Fixed a bug (#1039) - MySQL's _backup() method failed due to a table name not being escaped.
 -  Fixed a bug (#1070) - CI_DB_driver::initialize() didn't set a character set if a database is not selected.
 -  Fixed a bug (#177) - CI_Form_validation::set_value() didn't set the default value if POST data is NULL.
-
+-  Fixed a bug (#68, #414) - Oracle's escape_str() didn't properly escape LIKE wild characters.
+-  Fixed a bug (#81) - ODBC's list_fields() and field_data() methods skipped the first column due to odbc_field_*() functions' index starting at 1 instead of 0.
+-  Fixed a bug (#129) - ODBC's num_rows() returned -1 in some cases, due to not all subdrivers supporting the odbc_num_rows() function.
+-  Fixed a bug (#153) - E_NOTICE being generated by getimagesize() in the :doc:`File Uploading Library <libraries/file_uploading>`.
+-  Fixed a bug (#611) - SQLSRV's error handling methods used to issue warnings when there's no actual error.
+-  Fixed a bug (#1036) - is_write_type() method in the :doc:`Database Library <database/index>` didn't return TRUE for RENAME and OPTIMIZE queries.
+-  Fixed a bug in PDO's _version() method where it used to return the client version as opposed to the server one.
+-  Fixed a bug in PDO's insert_id() method where it could've failed if it's used with Postgre versions prior to 8.1.
+-  Fixed a bug in CUBRID's affected_rows() method where a connection resource was passed to cubrid_affected_rows() instead of a result.
+-  Fixed a bug (#638) - db_set_charset() ignored its arguments and always used the configured charset and collation instead.
+-  Fixed a bug (#413) - Oracle's error handling methods used to only return connection-related errors.
+-  Fixed a bug (#804) - Profiler library was trying to handle objects as strings in some cases, resulting in warnings being issued by htmlspecialchars().
+-  Fixed a bug (#1101) - MySQL/MySQLi result method field_data() was implemented as if it was handling a DESCRIBE result instead of the actual result set.
+-  Fixed a bug in Oracle's :doc:`Database Forge Class <database/forge>` method _create_table() where it failed with AUTO_INCREMENT as it's not supported.
+-  Fixed a bug (#1080) - When using the SMTP protocol, the :doc:`Email Library <libraries/email>` send() method was returning TRUE even if the connection/authentication against the server failed.
 
 Version 2.1.1
 =============
@@ -134,7 +157,6 @@ Bug fixes for 2.1.1
 -  Fixed a bug (#538) - Windows paths were ignored when using the :doc:`Image Manipulation Library <libraries/image_lib>` to create a new file.
 -  Fixed a bug - When database caching was enabled, $this->db->query() checked the cache before binding variables which resulted in cached queries never being found
 
-
 Version 2.1.0
 =============
 
diff --git a/user_guide_src/source/database/helpers.rst b/user_guide_src/source/database/helpers.rst
index 7ea19e9f6..e8a5ac801 100644
--- a/user_guide_src/source/database/helpers.rst
+++ b/user_guide_src/source/database/helpers.rst
@@ -7,9 +7,9 @@ $this->db->insert_id()
 
 The insert ID number when performing database inserts.
 
-.. note:: If using the PDO driver with PostgreSQL, this function requires
-	a $name parameter, which specifies the appropriate sequence to check
-	for the insert id.
+.. note:: If using the PDO driver with PostgreSQL, or using the Interbase
+	driver, this function requires a $name parameter, which specifies the 
+	appropriate sequence to check for the insert id.
 
 $this->db->affected_rows()
 ===========================
diff --git a/user_guide_src/source/database/queries.rst b/user_guide_src/source/database/queries.rst
index 971d5d61d..15a73614a 100644
--- a/user_guide_src/source/database/queries.rst
+++ b/user_guide_src/source/database/queries.rst
@@ -112,3 +112,20 @@ The secondary benefit of using binds is that the values are
 automatically escaped, producing safer queries. You don't have to
 remember to manually escape data; the engine does it automatically for
 you.
+
+***************
+Handling Errors
+***************
+
+$this->db->error();
+===================
+
+If you need to get the last error that has occured, the error() method
+will return an array containing its code and message. Here's a quick
+example::
+
+	if ( ! $this->db->simple_query('SELECT `example_field` FROM `example_table`'))
+	{
+		$error = $this->db->error(); // Has keys 'code' and 'message'
+	}
+
diff --git a/user_guide_src/source/database/utilities.rst b/user_guide_src/source/database/utilities.rst
index b0920109f..3805ffb87 100644
--- a/user_guide_src/source/database/utilities.rst
+++ b/user_guide_src/source/database/utilities.rst
@@ -161,7 +161,11 @@ $this->dbutil->backup()
 Permits you to backup your full database or individual tables. The
 backup data can be compressed in either Zip or Gzip format.
 
-.. note:: This features is only available for MySQL databases.
+.. note:: This features is only available for MySQL and Interbase/Firebird databases.
+
+.. note:: For Interbase/Firebird databases, the backup file name is the only parameter.
+	
+		Eg. $this->dbutil->backup('db_backup_filename');
 
 .. note:: Due to the limited execution time and memory available to PHP,
 	backing up very large databases may not be possible. If your database is
diff --git a/user_guide_src/source/libraries/form_validation.rst b/user_guide_src/source/libraries/form_validation.rst
index e7875bc22..09a192bb0 100644
--- a/user_guide_src/source/libraries/form_validation.rst
+++ b/user_guide_src/source/libraries/form_validation.rst
@@ -930,6 +930,15 @@ $this->form_validation->set_message();
 
 		Permits you to set custom error messages. See :ref:`setting-error-messages`
 
+$this->form_validation->error_array();
+========================================
+	
+	.. php:method:: error_array ()
+
+		:rtype: Array
+
+		Returns the error messages as an array.
+
 .. _helper-functions:
 
 ****************
diff --git a/user_guide_src/source/overview/at_a_glance.rst b/user_guide_src/source/overview/at_a_glance.rst
index 31f0b4dd9..6dcfdbb14 100644
--- a/user_guide_src/source/overview/at_a_glance.rst
+++ b/user_guide_src/source/overview/at_a_glance.rst
@@ -41,7 +41,7 @@ CodeIgniter Uses M-V-C
 CodeIgniter uses the Model-View-Controller approach, which allows great
 separation between logic and presentation. This is particularly good for
 projects in which designers are working with your template files, as the
-code these file contain will be minimized. We describe MVC in more
+code these files contain will be minimized. We describe MVC in more
 detail on its own page.
 
 CodeIgniter Generates Clean URLs