Merge upstream changes

7 files changed, 102 insertions, 79 deletions

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 $item;
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index f1e9e7239..5f435e363 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -644,17 +644,12 @@ class CI_DB_driver {
 	/**
 	 * Determines if a query is a "write" type.
 	 *
-	 * @access	public
 	 * @param	string	An SQL query string
-	 * @return	boolean
+	 * @return	bool
 	 */
-	function is_write_type($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)\s+/i', $sql);
 	}
 
 	// --------------------------------------------------------------------
@@ -1423,6 +1418,22 @@ class CI_DB_driver {
 
 		return $item.$alias;
 	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Dummy method that allows Active Record class to be disabled
+	 *
+	 * This function is used extensively by every db driver.
+	 *
+	 * @access	private
+	 * @return	void
+	 */
+	protected function _reset_select()
+	{
+	
+	}
+
 }
 
 /* End of file DB_driver.php */
diff --git a/system/database/drivers/cubrid/cubrid_driver.php b/system/database/drivers/cubrid/cubrid_driver.php
index a589ded0c..42f08fbf6 100644
--- a/system/database/drivers/cubrid/cubrid_driver.php
+++ b/system/database/drivers/cubrid/cubrid_driver.php
@@ -344,12 +344,11 @@ 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();
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/database/drivers/oci8/oci8_driver.php b/system/database/drivers/oci8/oci8_driver.php
index 292ccd0fd..d9acaaea6 100644
--- a/system/database/drivers/oci8/oci8_driver.php
+++ b/system/database/drivers/oci8/oci8_driver.php
@@ -382,10 +382,9 @@ 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)
 	{
@@ -399,15 +398,14 @@ 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;
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 fea54e502..90f0fd791 100644
--- a/system/database/drivers/pdo/pdo_driver.php
+++ b/system/database/drivers/pdo/pdo_driver.php
@@ -291,12 +291,11 @@ class CI_DB_pdo_driver extends CI_DB {
 	/**
 	 * Version number query string
 	 *
-	 * @access	public
 	 * @return	string
 	 */
-	function _version()
+	protected function _version()
 	{
-		return $this->conn_id->getAttribute(PDO::ATTR_CLIENT_VERSION);
+		return $this->conn_id->getAttribute(PDO::ATTR_SERVER_VERSION);
 	}
 
 	// --------------------------------------------------------------------
@@ -495,33 +494,19 @@ 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);
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/database/drivers/sqlsrv/sqlsrv_driver.php b/system/database/drivers/sqlsrv/sqlsrv_driver.php
index ba886f1fe..9b9038189 100644
--- a/system/database/drivers/sqlsrv/sqlsrv_driver.php
+++ b/system/database/drivers/sqlsrv/sqlsrv_driver.php
@@ -408,13 +408,18 @@ class CI_DB_sqlsrv_driver extends CI_DB {
 	/**
 	 * The error message string
 	 *
-	 * @access	private
 	 * @return	string
 	 */
-	function _error_message()
+	protected function _error_message()
 	{
-		$error = array_shift(sqlsrv_errors());
-		return !empty($error['message']) ? $error['message'] : null;
+		$error = sqlsrv_errors();
+		if ( ! is_array($error))
+		{
+			return '';
+		}
+
+		$error = array_shift($error);
+		return isset($error['message']) ? $error['message'] : '';
 	}
 
 	// --------------------------------------------------------------------
@@ -422,13 +427,25 @@ class CI_DB_sqlsrv_driver extends CI_DB {
 	/**
 	 * The error message number
 	 *
-	 * @access	private
-	 * @return	integer
+	 * @return	string
 	 */
-	function _error_number()
+	protected function _error_number()
 	{
-		$error = array_shift(sqlsrv_errors());
-		return isset($error['SQLSTATE']) ? $error['SQLSTATE'] : null;
+		$error = sqlsrv_errors();
+		if ( ! is_array($error))
+		{
+			return '';
+		}
+		elseif (isset($error['SQLSTATE']))
+		{
+			return isset($error['code']) ? $error['SQLSTATE'].'/'.$error['code'] : $error['SQLSTATE'];
+		}
+		elseif (isset($error['code']))
+		{
+			return $error['code'];
+		}
+
+		return '';
 	}
 
 	// --------------------------------------------------------------------