DB Utility improvements

 - Replaced driver methods _list_databases(), _optimize_table() and _repair_table() with properties
 - Added defaults for optimize_table() and repair_table() SQL strings (FALSE, as those are mostly MySQL-specific)
 - Added MSSQL/SQLSRV support for optimize_table() (actually rebuilds table indexes)
 - Switched public driver methods to protected
 - Improved CUBRID support for list_databases() as it used to only return the currently used database
 - Minor speed improvements

14 files changed, 101 insertions, 631 deletions

diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index 8b030af77..61b05d52b 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -637,7 +637,7 @@ abstract class CI_DB_driver {
 	 */
 	public function is_write_type($sql)
 	{
-		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);
+		return (bool) preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD DATA|COPY|ALTER|RENAME|GRANT|REVOKE|LOCK|UNLOCK|REINDEX)\s+/i', $sql);
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/database/DB_utility.php b/system/database/DB_utility.php
index 642a004bd..587dfdc01 100644
--- a/system/database/DB_utility.php
+++ b/system/database/DB_utility.php
@@ -37,6 +37,11 @@ abstract class CI_DB_utility extends CI_DB_forge {
 	public $db;
 	public $data_cache		= array();
 
+	// Platform specific SQL strings
+	// Just setting those defaults to FALSE as they are mostly MySQL-specific
+	protected $_optimize_table	= FALSE;
+	protected $_repair_table	= FALSE;
+
 	public function __construct()
 	{
 		// Assign the main database object to $this->db
@@ -50,7 +55,7 @@ abstract class CI_DB_utility extends CI_DB_forge {
 	/**
 	 * List databases
 	 *
-	 * @return	bool
+	 * @return	array
 	 */
 	public function list_databases()
 	{
@@ -59,18 +64,25 @@ abstract class CI_DB_utility extends CI_DB_forge {
 		{
 			return $this->data_cache['db_names'];
 		}
+		elseif ($this->_list_databases === FALSE)
+		{
+			return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
+		}
+
+		$this->data_cache['db_names'] = array();
 
-		$query = $this->db->query($this->_list_databases());
-		$dbs = array();
-		if ($query->num_rows() > 0)
+		$query = $this->db->query($this->_list_databases);
+		if ($query === FALSE)
 		{
-			foreach ($query->result_array() as $row)
-			{
-				$dbs[] = current($row);
-			}
+			return $this->data_cache['db_names'];
+		}
+
+		for ($i = 0, $c = count($query); $i < $c; $i++)
+		{
+			$this->data_cache['db_names'] = current($query[$i]);
 		}
 
-		return $this->data_cache['db_names'] = $dbs;
+		return $this->data_cache['db_names'];
 	}
 
 	// --------------------------------------------------------------------
@@ -79,48 +91,36 @@ abstract class CI_DB_utility extends CI_DB_forge {
 	 * Determine if a particular database exists
 	 *
 	 * @param	string
-	 * @return	boolean
+	 * @return	bool
 	 */
 	public function database_exists($database_name)
 	{
-		// Some databases won't have access to the list_databases() function, so
-		// this is intended to allow them to override with their own functions as
-		// defined in $driver_utility.php
-		if (method_exists($this, '_database_exists'))
-		{
-			return $this->_database_exists($database_name);
-		}
-		else
-		{
-			return ( ! in_array($database_name, $this->list_databases())) ? FALSE : TRUE;
-		}
+		return in_array($database_name, $this->list_databases());
 	}
 
-
 	// --------------------------------------------------------------------
 
 	/**
 	 * Optimize Table
 	 *
 	 * @param	string	the table name
-	 * @return	bool
+	 * @return	mixed
 	 */
 	public function optimize_table($table_name)
 	{
-		$sql = $this->_optimize_table($table_name);
-
-		if (is_bool($sql))
+		if ($this->_optimize_table === FALSE)
 		{
-			show_error('db_must_use_set');
-			return FALSE;
+			return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
 		}
 
-		$query = $this->db->query($sql);
-		$res = $query->result_array();
+		$query = $this->db->query(sprintf($this->_optimize_table, $this->db->escape_identifiers($table_name)));
+		if ($query !== FALSE)
+		{
+			$query = $query->result_array();
+			return current($res);
+		}
 
-		// Note: Due to a bug in current() that affects some versions
-		// of PHP we can not pass function call directly into it
-		return current($res);
+		return FALSE;
 	}
 
 	// --------------------------------------------------------------------
@@ -128,26 +128,26 @@ abstract class CI_DB_utility extends CI_DB_forge {
 	/**
 	 * Optimize Database
 	 *
-	 * @return	array
+	 * @return	mixed
 	 */
 	public function optimize_database()
 	{
+		if ($this->_optimize_table === FALSE)
+		{
+			return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
+		}
+
 		$result = array();
 		foreach ($this->db->list_tables() as $table_name)
 		{
-			$sql = $this->_optimize_table($table_name);
-
-			if (is_bool($sql))
+			$res = $this->db->query(sprintf($this->_optimize_table, $this->db->escape_identifiers($table_name)));
+			if (is_bool($res))
 			{
-				return $sql;
+				return $res;
 			}
 
-			$query = $this->db->query($sql);
-
 			// Build the result array...
-			// Note: Due to a bug in current() that affects some versions
-			// of PHP we can not pass function call directly into it
-			$res = $query->result_array();
+			$res = $res->result_array();
 			$res = current($res);
 			$key = str_replace($this->db->database.'.', '', current($res));
 			$keys = array_keys($res);
@@ -165,23 +165,23 @@ abstract class CI_DB_utility extends CI_DB_forge {
 	 * Repair Table
 	 *
 	 * @param	string	the table name
-	 * @return	bool
+	 * @return	mixed
 	 */
 	public function repair_table($table_name)
 	{
-		$sql = $this->_repair_table($table_name);
-
-		if (is_bool($sql))
+		if ($this->_repair_table === FALSE)
 		{
-			return $sql;
+			return ($this->db->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
 		}
 
-		$query = $this->db->query($sql);
+		$query = $this->db->query(sprintf($this->_repair_table, $this->db->escape_identifiers($table_name)));
+		if (is_bool($query))
+		{
+			return $query;
+		}
 
-		// Note: Due to a bug in current() that affects some versions
-		// of PHP we can not pass function call directly into it
-		$res = $query->result_array();
-		return current($res);
+		$query = $query->result_array();
+		return current($query);
 	}
 
 	// --------------------------------------------------------------------
@@ -257,18 +257,18 @@ abstract class CI_DB_utility extends CI_DB_forge {
 		$CI->load->helper('xml');
 
 		// Generate the result
-		$xml = "<{$root}>".$newline;
+		$xml = '<'.$root.'>'.$newline;
 		foreach ($query->result_array() as $row)
 		{
-			$xml .= $tab."<{$element}>".$newline;
+			$xml .= $tab.'<'.$element.'>'.$newline;
 			foreach ($row as $key => $val)
 			{
-				$xml .= $tab.$tab."<{$key}>".xml_convert($val)."</{$key}>".$newline;
+				$xml .= $tab.$tab.'<'.$key.'>'.xml_convert($val).'</'.$key.'>'.$newline;
 			}
-			$xml .= $tab."</{$element}>".$newline;
+			$xml .= $tab.'</'.$element.'>'.$newline;
 		}
 
-		return $xml .= "</$root>".$newline;
+		return $xml.'</'.$root.'>'.$newline;
 	}
 
 	// --------------------------------------------------------------------
@@ -328,8 +328,8 @@ abstract class CI_DB_utility extends CI_DB_forge {
 
 		// Is the encoder supported? If not, we'll either issue an
 		// error or use plain text depending on the debug settings
-		if (($prefs['format'] === 'gzip' AND ! @function_exists('gzencode'))
-			OR ($prefs['format'] === 'zip'  AND ! @function_exists('gzcompress')))
+		if (($prefs['format'] === 'gzip' && ! @function_exists('gzencode'))
+			OR ($prefs['format'] === 'zip' && ! @function_exists('gzcompress')))
 		{
 			if ($this->db->db_debug)
 			{
diff --git a/system/database/drivers/cubrid/cubrid_utility.php b/system/database/drivers/cubrid/cubrid_utility.php
index dafd66146..274ff6a48 100644
--- a/system/database/drivers/cubrid/cubrid_utility.php
+++ b/system/database/drivers/cubrid/cubrid_utility.php
@@ -39,69 +39,25 @@ class CI_DB_cubrid_utility extends CI_DB_utility {
 	 *
 	 * @return	array
 	 */
-	public function _list_databases()
+	public function list_databases()
 	{
-		// CUBRID does not allow to see the list of all databases on the
-		// server. It is the way its architecture is designed. Every
-		// database is independent and isolated.
-		// For this reason we can return only the name of the currect
-		// connected database.
-		if ($this->conn_id)
+		if (isset($this->data_cache['db_names']))
 		{
-			return "SELECT '" . $this->database . "'";
+			return $this->data_cache['db_names'];
 		}
-		else
-		{
-			return FALSE;
-		}
-	}
-
-	// --------------------------------------------------------------------
 
-	/**
-	 * Optimize table query
-	 *
-	 * Generates a platform-specific query so that a table can be optimized
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 * @link 	http://www.cubrid.org/manual/840/en/Optimize%20Database
-	 */
-	public function _optimize_table($table)
-	{
-		// No SQL based support in CUBRID as of version 8.4.0. Database or
-		// table optimization can be performed using CUBRID Manager
-		// database administration tool. See the link above for more info.
-		return FALSE;
+		return $this->data_cache['db_names'] = cubrid_list_dbs($this->db->conn_id);
 	}
 
 	// --------------------------------------------------------------------
 
 	/**
-	 * Repair table query
-	 *
-	 * Generates a platform-specific query so that a table can be repaired
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 * @link 	http://www.cubrid.org/manual/840/en/Checking%20Database%20Consistency
-	 */
-	public function _repair_table($table)
-	{
-		// Not supported in CUBRID as of version 8.4.0. Database or
-		// table consistency can be checked using CUBRID Manager
-		// database administration tool. See the link above for more info.
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
-	/**
 	 * CUBRID Export
 	 *
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// No SQL based support in CUBRID as of version 8.4.0. Database or
 		// table backup can be performed using CUBRID Manager
diff --git a/system/database/drivers/interbase/interbase_utility.php b/system/database/drivers/interbase/interbase_utility.php
index a88055ee0..1b92af9b6 100644
--- a/system/database/drivers/interbase/interbase_utility.php
+++ b/system/database/drivers/interbase/interbase_utility.php
@@ -25,8 +25,6 @@
  * @filesource
  */
 
-// ------------------------------------------------------------------------
-
 /**
  * Interbase/Firebird Utility Class
  *
@@ -36,56 +34,7 @@
  */
 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;
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases	= FALSE;
 
 	/**
 	 * Interbase/Firebird Export
@@ -93,22 +42,20 @@ class CI_DB_interbase_utility extends CI_DB_utility {
 	 * @param	string	$filename
 	 * @return	mixed
 	 */
-	public function backup($filename)
+	protected function backup($filename)
 	{
 		if ($service = ibase_service_attach($this->db->hostname, $this->db->username, $this->db->password))
 		{
 			$res = ibase_backup($service, $this->db->database, $filename.'.fbk');
-			
-			//Close the service connection	
+
+			// Close the service connection
 			ibase_service_detach($service);
-			
 			return $res;
 		}
-		else
-		{
-			return FALSE;
-		}
+
+		return FALSE;
 	}
+
 }
 
 /* End of file interbase_utility.php */
diff --git a/system/database/drivers/mssql/mssql_utility.php b/system/database/drivers/mssql/mssql_utility.php
index 5c144330d..6d47618ce 100644
--- a/system/database/drivers/mssql/mssql_utility.php
+++ b/system/database/drivers/mssql/mssql_utility.php
@@ -34,47 +34,8 @@
  */
 class CI_DB_mssql_utility extends CI_DB_utility {
 
-	/**
-	 * List databases
-	 *
-	 * @return	string
-	 */
-	public function _list_databases()
-	{
-		return "EXEC sp_helpdb"; // Can also be: EXEC sp_databases
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * Generates a platform-specific query so that a table can be optimized
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _optimize_table($table)
-	{
-		return FALSE; // Is this supported in MS SQL?
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * Generates a platform-specific query so that a table can be repaired
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _repair_table($table)
-	{
-		return FALSE; // Is this supported in MS SQL?
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases	= 'EXEC sp_helpdb'; // Can also be: EXEC sp_databases
+	protected $_optimize_table	= 'ALTER INDEX all ON %s REORGANIZE';
 
 	/**
 	 * MSSQL Export
@@ -82,7 +43,7 @@ class CI_DB_mssql_utility extends CI_DB_utility {
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');
diff --git a/system/database/drivers/mysql/mysql_utility.php b/system/database/drivers/mysql/mysql_utility.php
index 2d89cb9cb..642323dbd 100644
--- a/system/database/drivers/mysql/mysql_utility.php
+++ b/system/database/drivers/mysql/mysql_utility.php
@@ -34,54 +34,17 @@
  */
 class CI_DB_mysql_utility extends CI_DB_utility {
 
-	/**
-	 * List databases
-	 *
-	 * @return	string
-	 */
-	public function _list_databases()
-	{
-		return 'SHOW DATABASES';
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * Generates a platform-specific query so that a table can be optimized
-	 *
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	public function _optimize_table($table)
-	{
-		return 'OPTIMIZE TABLE '.$this->db->protect_identifiers($table);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * Generates a platform-specific query so that a table can be repaired
-	 *
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	public function _repair_table($table)
-	{
-		return 'REPAIR TABLE '.$this->db->protect_identifiers($table);
-	}
+	protected $_list_databases	= 'SHOW DATABASES';
+	protected $_optimize_table	= 'OPTIMIZE TABLE %s';
+	protected $_repair_table	= 'REPAIR TABLE %s';
 
-	// --------------------------------------------------------------------
 	/**
 	 * MySQL Export
 	 *
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		if (count($params) === 0)
 		{
diff --git a/system/database/drivers/mysqli/mysqli_utility.php b/system/database/drivers/mysqli/mysqli_utility.php
index cb3f86b8b..27d4ef817 100644
--- a/system/database/drivers/mysqli/mysqli_utility.php
+++ b/system/database/drivers/mysqli/mysqli_utility.php
@@ -34,47 +34,9 @@
  */
 class CI_DB_mysqli_utility extends CI_DB_utility {
 
-	/**
-	 * List databases
-	 *
-	 * @return	string
-	 */
-	public function _list_databases()
-	{
-		return 'SHOW DATABASES';
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * Generates a platform-specific query so that a table can be optimized
-	 *
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	public function _optimize_table($table)
-	{
-		return 'OPTIMIZE TABLE '.$this->db->escape_identifiers($table);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * Generates a platform-specific query so that a table can be repaired
-	 *
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	public function _repair_table($table)
-	{
-		return 'REPAIR TABLE '.$this->db->escape_identifiers($table);
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases	= 'SHOW DATABASES';
+	protected $_optimize_table	= 'OPTIMIZE TABLE %s';
+	protected $_repair_table	= 'REPAIR TABLE %s';
 
 	/**
 	 * MySQLi Export
@@ -82,7 +44,7 @@ class CI_DB_mysqli_utility extends CI_DB_utility {
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');
diff --git a/system/database/drivers/oci8/oci8_utility.php b/system/database/drivers/oci8/oci8_utility.php
index efb4bca02..0183eda26 100644
--- a/system/database/drivers/oci8/oci8_utility.php
+++ b/system/database/drivers/oci8/oci8_utility.php
@@ -34,50 +34,7 @@
  */
 class CI_DB_oci8_utility extends CI_DB_utility {
 
-	/**
-	 * List databases
-	 *
-	 * Generates a platform-specific query so that we get a list of schemas
-	 * Those are actually usernames in Oracle.
-	 *
-	 * @return	string
-	 */
-	public function _list_databases()
-	{
-		return 'SELECT username FROM dba_users';
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * Generates a platform-specific query so that a table can be optimized
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _optimize_table($table)
-	{
-		return FALSE; // Not supported in Oracle
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * Generates a platform-specific query so that a table can be repaired
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _repair_table($table)
-	{
-		return FALSE; // Not supported in Oracle
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases	= 'SELECT username FROM dba_users'; // Schemas are actual usernames
 
 	/**
 	 * Oracle Export
@@ -85,7 +42,7 @@ class CI_DB_oci8_utility extends CI_DB_utility {
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');
diff --git a/system/database/drivers/odbc/odbc_utility.php b/system/database/drivers/odbc/odbc_utility.php
index 65445e96c..224d48d2b 100644
--- a/system/database/drivers/odbc/odbc_utility.php
+++ b/system/database/drivers/odbc/odbc_utility.php
@@ -34,62 +34,7 @@
  */
 class CI_DB_odbc_utility extends CI_DB_utility {
 
-	/**
-	 * List databases
-	 *
-	 * @return	bool
-	 */
-	public function _list_databases()
-	{
-		// Not sure if ODBC lets you list all databases...
-		if ($this->db->db_debug)
-		{
-			return $this->db->display_error('db_unsuported_feature');
-		}
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * Generates a platform-specific query so that a table can be optimized
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _optimize_table($table)
-	{
-		// Not a supported ODBC feature
-		if ($this->db->db_debug)
-		{
-			return $this->db->display_error('db_unsuported_feature');
-		}
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * Generates a platform-specific query so that a table can be repaired
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _repair_table($table)
-	{
-		// Not a supported ODBC feature
-		if ($this->db->db_debug)
-		{
-			return $this->db->display_error('db_unsuported_feature');
-		}
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases	= FALSE;
 
 	/**
 	 * ODBC Export
@@ -97,7 +42,7 @@ class CI_DB_odbc_utility extends CI_DB_utility {
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');
diff --git a/system/database/drivers/pdo/pdo_utility.php b/system/database/drivers/pdo/pdo_utility.php
index 86c798397..930842118 100644
--- a/system/database/drivers/pdo/pdo_utility.php
+++ b/system/database/drivers/pdo/pdo_utility.php
@@ -34,62 +34,7 @@
  */
 class CI_DB_pdo_utility extends CI_DB_utility {
 
-	/**
-	 * List databases
-	 *
-	 * @return	bool
-	 */
-	public function _list_databases()
-	{
-		// Not sure if PDO lets you list all databases...
-		if ($this->db->db_debug)
-		{
-			return $this->db->display_error('db_unsuported_feature');
-		}
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * Generates a platform-specific query so that a table can be optimized
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _optimize_table($table)
-	{
-		// Not a supported PDO feature
-		if ($this->db->db_debug)
-		{
-			return $this->db->display_error('db_unsuported_feature');
-		}
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * Generates a platform-specific query so that a table can be repaired
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _repair_table($table)
-	{
-		// Not a supported PDO feature
-		if ($this->db->db_debug)
-		{
-			return $this->db->display_error('db_unsuported_feature');
-		}
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases = FALSE;
 
 	/**
 	 * PDO Export
@@ -97,7 +42,7 @@ class CI_DB_pdo_utility extends CI_DB_utility {
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');
diff --git a/system/database/drivers/postgre/postgre_utility.php b/system/database/drivers/postgre/postgre_utility.php
index cf29201ff..c95e6df0c 100644
--- a/system/database/drivers/postgre/postgre_utility.php
+++ b/system/database/drivers/postgre/postgre_utility.php
@@ -34,43 +34,8 @@
  */
 class CI_DB_postgre_utility extends CI_DB_utility {
 
-	/**
-	 * List databases
-	 *
-	 * @return	string
-	 */
-	public function _list_databases()
-	{
-		return 'SELECT datname FROM pg_database';
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	public function _optimize_table($table)
-	{
-		return 'REINDEX TABLE '.$this->db->protect_identifiers($table);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _repair_table($table)
-	{
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases	= 'SELECT datname FROM pg_database';
+	protected $_optimize_table	= 'REINDEX TABLE %s';
 
 	/**
 	 * Postgre Export
@@ -78,7 +43,7 @@ class CI_DB_postgre_utility extends CI_DB_utility {
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');
diff --git a/system/database/drivers/sqlite/sqlite_utility.php b/system/database/drivers/sqlite/sqlite_utility.php
index c07004c54..1bcb42d9f 100644
--- a/system/database/drivers/sqlite/sqlite_utility.php
+++ b/system/database/drivers/sqlite/sqlite_utility.php
@@ -34,50 +34,7 @@
  */
 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
-	 * try reading a directory looking for SQLite files, but
-	 * that doesn't seem like a terribly good idea
-	 *
-	 * @return	bool
-	 */
-	public function _list_databases()
-	{
-		return ($this->db_debug) ? $this->db->display_error('db_unsuported_feature') : FALSE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _optimize_table($table)
-	{
-		// Not supported
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _repair_table($table)
-	{
-		// Not supported
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases	= FALSE;
 
 	/**
 	 * SQLite Export
@@ -85,7 +42,7 @@ class CI_DB_sqlite_utility extends CI_DB_utility {
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');
diff --git a/system/database/drivers/sqlite3/sqlite3_utility.php b/system/database/drivers/sqlite3/sqlite3_utility.php
index ffb5bac0b..965c838e5 100644
--- a/system/database/drivers/sqlite3/sqlite3_utility.php
+++ b/system/database/drivers/sqlite3/sqlite3_utility.php
@@ -34,56 +34,7 @@
  */
 class CI_DB_sqlite3_utility extends CI_DB_utility {
 
-	/**
-	 * List databases
-	 *
-	 * @return	bool
-	 */
-	public function _list_databases()
-	{
-		// Not supported
-		return FALSE;
-
-		// Do we use this?
-		if ($this->db_debug)
-		{
-			return $this->db->display_error('db_unsuported_feature');
-		}
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * Is optimization even supported in SQLite?
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _optimize_table($table)
-	{
-		// Not supported
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * Are table repairs even supported in SQLite?
-	 *
-	 * @param	string	the table name
-	 * @return	object
-	 */
-	public function _repair_table($table)
-	{
-		// Not supported
-		return FALSE;
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases	= FALSE;
 
 	/**
 	 * SQLite Export
@@ -91,7 +42,7 @@ class CI_DB_sqlite3_utility extends CI_DB_utility {
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Not supported
 		return $this->db->display_error('db_unsuported_feature');
diff --git a/system/database/drivers/sqlsrv/sqlsrv_utility.php b/system/database/drivers/sqlsrv/sqlsrv_utility.php
index 5830c62de..394964b6a 100644
--- a/system/database/drivers/sqlsrv/sqlsrv_utility.php
+++ b/system/database/drivers/sqlsrv/sqlsrv_utility.php
@@ -34,55 +34,16 @@
  */
 class CI_DB_sqlsrv_utility extends CI_DB_utility {
 
-	/**
-	 * List databases
-	 *
-	 * @return	string
-	 */
-	public function _list_databases()
-	{
-		return "EXEC sp_helpdb"; // Can also be: EXEC sp_databases
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Optimize table query
-	 *
-	 * Generates a platform-specific query so that a table can be optimized
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _optimize_table($table)
-	{
-		return FALSE; // Is this supported in MS SQL?
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Repair table query
-	 *
-	 * Generates a platform-specific query so that a table can be repaired
-	 *
-	 * @param	string	the table name
-	 * @return	bool
-	 */
-	public function _repair_table($table)
-	{
-		return FALSE; // Is this supported in MS SQL?
-	}
-
-	// --------------------------------------------------------------------
+	protected $_list_databases	= 'EXEC sp_helpdb'; // Can also be: EXEC sp_databases
+	protected $_optimize_table	= 'ALTER INDEX all ON %s REORGANIZE';
 
 	/**
-	 * MSSQL Export
+	 * SQLSRV Export
 	 *
 	 * @param	array	Preferences
 	 * @return	mixed
 	 */
-	public function _backup($params = array())
+	protected function _backup($params = array())
 	{
 		// Currently unsupported
 		return $this->db->display_error('db_unsuported_feature');