system/database/drivers/mssql/mssql_driver.php - code-igniter-v3-giggi - Gitiles

 <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
  * An open source application development framework for PHP 5.2.4 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 1.0
  * @filesource
  */

 /**
  * MS SQL Database Adapter Class
  *
  * Note: _DB is an extender class that the app controller
  * creates dynamically based on whether the query builder
  * 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_mssql_driver extends CI_DB {

 	public $dbdriver = 'mssql';

 	// The character used for escaping
 	protected $_escape_char = '"';

 	protected $_random_keyword = ' NEWID()';

 	// MSSQL-specific properties
 	protected $_quoted_identifier = TRUE;

 	/*
 	 * Constructor
 	 *
 	 * Appends the port number to the hostname, if needed.
 	 *
 	 * @param	array
 	 * @return	void
 	 */
 	public function __construct($params)
 	{
 		parent::__construct($params);

 		if ( ! empty($this->port))
 		{
 			$this->hostname .= (DIRECTORY_SEPARATOR === '\\' ? ',' : ':').$this->port;
 		}
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Non-persistent database connection
 	 *
 	 * @param	bool
 	 * @return	resource
 	 */
 	public function db_connect($persistent = FALSE)
 	{
 		$this->conn_id = ($persistent)
 				? @mssql_pconnect($this->hostname, $this->username, $this->password)
 				: @mssql_connect($this->hostname, $this->username, $this->password);

 		if ( ! $this->conn_id)
 		{
 			return FALSE;
 		}

 		// Determine how identifiers are escaped
 		$query = $this->query('SELECT CASE WHEN (@@OPTIONS | 256) = @@OPTIONS THEN 1 ELSE 0 END AS qi');
 		$query = $query->row_array();
 		$this->_quoted_identifier = empty($query) ? FALSE : (bool) $query['qi'];
 		$this->_escape_char = ($this->_quoted_identifier) ? '"' : array('[', ']');

 		return $this->conn_id;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Persistent database connection
 	 *
 	 * @return	resource
 	 */
 	public function db_pconnect()
 	{
 		return $this->db_connect(TRUE);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Select the database
 	 *
 	 * @param	string	database name
 	 * @return	bool
 	 */
 	public function db_select($database = '')
 	{
 		if ($database === '')
 		{
 			$database = $this->database;
 		}

 		// Note: The brackets are required in the event that the DB name
 		// contains reserved characters
 		if (@mssql_select_db($this->escape_identifiers($database), $this->conn_id))
 		{
 			$this->database = $database;
 			return TRUE;
 		}

 		return FALSE;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Execute the query
 	 *
 	 * @param	string	an SQL query
 	 * @return	mixed	resource if rows are returned, bool otherwise
 	 */
 	protected function _execute($sql)
 	{
 		return @mssql_query($sql, $this->conn_id);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Begin Transaction
 	 *
 	 * @return	bool
 	 */
 	public function trans_begin($test_mode = FALSE)
 	{
 		// When transactions are nested we only begin/commit/rollback the outermost ones
 		if ( ! $this->trans_enabled OR $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);

 		return $this->simple_query('BEGIN TRAN');
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Commit Transaction
 	 *
 	 * @return	bool
 	 */
 	public function trans_commit()
 	{
 		// When transactions are nested we only begin/commit/rollback the outermost ones
 		if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
 		{
 			return TRUE;
 		}

 		return $this->simple_query('COMMIT TRAN');
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Rollback Transaction
 	 *
 	 * @return	bool
 	 */
 	public function trans_rollback()
 	{
 		// When transactions are nested we only begin/commit/rollback the outermost ones
 		if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
 		{
 			return TRUE;
 		}

 		return $this->simple_query('ROLLBACK TRAN');
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * 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 single quotes
 		$str = str_replace("'", "''", remove_invisible_characters($str));

 		// escape LIKE condition wildcards
 		if ($like === TRUE)
 		{
 			return str_replace(
 				array($this->_like_escape_chr, '%', '_'),
 				array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'),
 				$str
 			);
 		}

 		return $str;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Affected Rows
 	 *
 	 * @return	int
 	 */
 	public function affected_rows()
 	{
 		return @mssql_rows_affected($this->conn_id);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Insert ID
 	 *
 	 * Returns the last id created in the Identity column.
 	 *
 	 * @return	string
 	 */
 	public function insert_id()
 	{
 		$query = version_compare($this->version(), '8', '>=')
 			? 'SELECT SCOPE_IDENTITY() AS last_id'
 			: 'SELECT @@IDENTITY AS last_id';

 		$query = $this->query($query);
 		$query = $query->row();
 		return $query->last_id;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Version number query string
 	 *
 	 * @return	string
 	 */
 	protected function _version()
 	{
 		return 'SELECT @@VERSION AS ver';
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * List table query
 	 *
 	 * Generates a platform-specific query string so that the table names can be fetched
 	 *
 	 * @param	bool
 	 * @return	string
 	 */
 	protected function _list_tables($prefix_limit = FALSE)
 	{
 		$sql = 'SELECT '.$this->escape_identifiers('name')
 			.' FROM '.$this->escape_identifiers('sysobjects')
 			.' WHERE '.$this->escape_identifiers('type')." = 'U'";

 		if ($prefix_limit !== FALSE AND $this->dbprefix !== '')
 		{
 			$sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$this->escape_like_str($this->dbprefix)."%' "
 				.sprintf($this->_like_escape_str, $this->_like_escape_chr);
 		}

 		return $sql.' ORDER BY '.$this->escape_identifiers('name');
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * List 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($table = '')
 	{
 		return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$table."'";
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Field data query
 	 *
 	 * Generates a platform-specific query so that the column data can be retrieved
 	 *
 	 * @param	string	the table name
 	 * @return	string
 	 */
 	protected function _field_data($table)
 	{
 		return 'SELECT TOP 1 * FROM '.$this->protect_identifiers($table);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Error
 	 *
 	 * Returns an array containing code and message of the last
 	 * database error that has occured.
 	 *
 	 * @return	array
 	 */
 	public function error()
 	{
 		$query = $this->query('SELECT @@ERROR AS code');
 		$query = $query->row();
 		return array('code' => $query->code, 'message' => mssql_get_last_message());
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * From Tables
 	 *
 	 * This function implicitly groups FROM tables so there is no confusion
 	 * about operator precedence in harmony with SQL standards
 	 *
 	 * @param	array
 	 * @return	string
 	 */
 	protected function _from_tables($tables)
 	{
 		return is_array($tables) ? implode(', ', $tables) : $tables;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * 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 (ignored)
 	 * @param	array	the limit clause (ignored)
 	 * @param	array	the like clause
 	 * @return	string
 	 */
 	protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE, $like = array())
 	{
 		foreach($values as $key => $val)
 		{
 			$valstr[] = $key.' = '.$val;
 		}

 		$where = empty($where) ? '' : ' WHERE '.implode(' ', $where);

 		if ( ! empty($like))
 		{
 			$where .= ($where === '' ? ' WHERE ' : ' AND ').implode(' ', $like);
 		}

 		return 'UPDATE '.$table.' SET '.implode(', ', $valstr).' WHERE '.$where;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Truncate statement
 	 *
 	 * Generates a platform-specific truncate string from the supplied data
 	 *
 	 * If the database does not support the truncate() command,
 	 * then this method maps to 'DELETE FROM table'
 	 *
 	 * @param	string	the table name
 	 * @return	string
 	 */
 	protected function _truncate($table)
 	{
 		return 'TRUNCATE TABLE '.$table;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Delete statement
 	 *
 	 * Generates a platform-specific delete string from the supplied data
 	 *
 	 * @param	string	the table name
 	 * @param	array	the where clause
 	 * @param	array	the like clause
 	 * @param	string	the limit clause
 	 * @return	string
 	 */
 	protected function _delete($table, $where = array(), $like = array(), $limit = FALSE)
 	{
 		$conditions = array();

 		empty($where) OR $conditions[] = implode(' ', $where);
 		empty($like) OR $conditions[] = implode(' ', $like);

 		$conditions = (count($conditions) > 0) ? ' WHERE '.implode(' AND ', $conditions) : '';

 		return ($limit)
 			? 'WITH ci_delete AS (SELECT TOP '.$limit.' * FROM '.$table.$conditions.') DELETE FROM ci_delete'
 			: 'DELETE FROM '.$table.$conditions;
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Limit string
 	 *
 	 * Generates a platform-specific LIMIT clause
 	 *
 	 * @param	string	the sql query string
 	 * @param	int	the number of rows to limit the query to
 	 * @param	int	the offset value
 	 * @return	string
 	 */
 	protected function _limit($sql, $limit, $offset)
 	{
 		// As of SQL Server 2012 (11.0.*) OFFSET is supported
 		if (version_compare($this->version(), '11', '>='))
 		{
 			return $sql.' OFFSET '.(int) $offset.' ROWS FETCH NEXT '.(int) $limit.' ROWS ONLY';
 		}

 		$limit = $offset + $limit;

 		// As of SQL Server 2005 (9.0.*) ROW_NUMBER() is supported,
 		// however an ORDER BY clause is required for it to work
 		if (version_compare($this->version(), '9', '>=') && $offset && ! empty($this->qb_orderby))
 		{
 			$orderby = 'ORDER BY '.implode(', ', $this->qb_orderby);

 			// We have to strip the ORDER BY clause
 			$sql = trim(substr($sql, 0, strrpos($sql, 'ORDER BY '.$orderby)));

 			return 'SELECT '.(count($this->qb_select) === 0 ? '*' : implode(', ', $this->qb_select))." FROM (\n"
 				.preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.$orderby.') AS '.$this->escape_identifiers('CI_rownum').', ', $sql)
 				."\n) ".$this->escape_identifiers('CI_subquery')
 				."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.((int) $offset + 1).' AND '.$limit;
 		}

 		return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql);
 	}

 	// --------------------------------------------------------------------

 	/**
 	 * Close DB Connection
 	 *
 	 * @return	void
 	 */
 	protected function _close()
 	{
 		@mssql_close($this->conn_id);
 	}

 }

 /* End of file mssql_driver.php */
 /* Location: ./system/database/drivers/mssql/mssql_driver.php */
	<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
	/**
	* CodeIgniter
	*
	* An open source application development framework for PHP 5.2.4 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 1.0
	* @filesource
	*/

	/**
	* MS SQL Database Adapter Class
	*
	* Note: _DB is an extender class that the app controller
	* creates dynamically based on whether the query builder
	* 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_mssql_driver extends CI_DB {

	public $dbdriver = 'mssql';

	// The character used for escaping
	protected $_escape_char = '"';

	protected $_random_keyword = ' NEWID()';

	// MSSQL-specific properties
	protected $_quoted_identifier = TRUE;

	/*
	* Constructor
	*
	* Appends the port number to the hostname, if needed.
	*
	* @param array
	* @return void
	*/
	public function __construct($params)
	{
	parent::__construct($params);

	if ( ! empty($this->port))
	{
	$this->hostname .= (DIRECTORY_SEPARATOR === '\\' ? ',' : ':').$this->port;
	}
	}

	// --------------------------------------------------------------------

	/**
	* Non-persistent database connection
	*
	* @param bool
	* @return resource
	*/
	public function db_connect($persistent = FALSE)
	{
	$this->conn_id = ($persistent)
	? @mssql_pconnect($this->hostname, $this->username, $this->password)
	: @mssql_connect($this->hostname, $this->username, $this->password);

	if ( ! $this->conn_id)
	{
	return FALSE;
	}

	// Determine how identifiers are escaped
	$query = $this->query('SELECT CASE WHEN (@@OPTIONS \| 256) = @@OPTIONS THEN 1 ELSE 0 END AS qi');
	$query = $query->row_array();
	$this->_quoted_identifier = empty($query) ? FALSE : (bool) $query['qi'];
	$this->_escape_char = ($this->_quoted_identifier) ? '"' : array('[', ']');

	return $this->conn_id;
	}

	// --------------------------------------------------------------------

	/**
	* Persistent database connection
	*
	* @return resource
	*/
	public function db_pconnect()
	{
	return $this->db_connect(TRUE);
	}

	// --------------------------------------------------------------------

	/**
	* Select the database
	*
	* @param string database name
	* @return bool
	*/
	public function db_select($database = '')
	{
	if ($database === '')
	{
	$database = $this->database;
	}

	// Note: The brackets are required in the event that the DB name
	// contains reserved characters
	if (@mssql_select_db($this->escape_identifiers($database), $this->conn_id))
	{
	$this->database = $database;
	return TRUE;
	}

	return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	* Execute the query
	*
	* @param string an SQL query
	* @return mixed resource if rows are returned, bool otherwise
	*/
	protected function _execute($sql)
	{
	return @mssql_query($sql, $this->conn_id);
	}

	// --------------------------------------------------------------------

	/**
	* Begin Transaction
	*
	* @return bool
	*/
	public function trans_begin($test_mode = FALSE)
	{
	// When transactions are nested we only begin/commit/rollback the outermost ones
	if ( ! $this->trans_enabled OR $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);

	return $this->simple_query('BEGIN TRAN');
	}

	// --------------------------------------------------------------------

	/**
	* Commit Transaction
	*
	* @return bool
	*/
	public function trans_commit()
	{
	// When transactions are nested we only begin/commit/rollback the outermost ones
	if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
	{
	return TRUE;
	}

	return $this->simple_query('COMMIT TRAN');
	}

	// --------------------------------------------------------------------

	/**
	* Rollback Transaction
	*
	* @return bool
	*/
	public function trans_rollback()
	{
	// When transactions are nested we only begin/commit/rollback the outermost ones
	if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
	{
	return TRUE;
	}

	return $this->simple_query('ROLLBACK TRAN');
	}

	// --------------------------------------------------------------------

	/**
	* 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 single quotes
	$str = str_replace("'", "''", remove_invisible_characters($str));

	// escape LIKE condition wildcards
	if ($like === TRUE)
	{
	return str_replace(
	array($this->_like_escape_chr, '%', '_'),
	array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'),
	$str
	);
	}

	return $str;
	}

	// --------------------------------------------------------------------

	/**
	* Affected Rows
	*
	* @return int
	*/
	public function affected_rows()
	{
	return @mssql_rows_affected($this->conn_id);
	}

	// --------------------------------------------------------------------

	/**
	* Insert ID
	*
	* Returns the last id created in the Identity column.
	*
	* @return string
	*/
	public function insert_id()
	{
	$query = version_compare($this->version(), '8', '>=')
	? 'SELECT SCOPE_IDENTITY() AS last_id'
	: 'SELECT @@IDENTITY AS last_id';

	$query = $this->query($query);
	$query = $query->row();
	return $query->last_id;
	}

	// --------------------------------------------------------------------

	/**
	* Version number query string
	*
	* @return string
	*/
	protected function _version()
	{
	return 'SELECT @@VERSION AS ver';
	}

	// --------------------------------------------------------------------

	/**
	* List table query
	*
	* Generates a platform-specific query string so that the table names can be fetched
	*
	* @param bool
	* @return string
	*/
	protected function _list_tables($prefix_limit = FALSE)
	{
	$sql = 'SELECT '.$this->escape_identifiers('name')
	.' FROM '.$this->escape_identifiers('sysobjects')
	.' WHERE '.$this->escape_identifiers('type')." = 'U'";

	if ($prefix_limit !== FALSE AND $this->dbprefix !== '')
	{
	$sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$this->escape_like_str($this->dbprefix)."%' "
	.sprintf($this->_like_escape_str, $this->_like_escape_chr);
	}

	return $sql.' ORDER BY '.$this->escape_identifiers('name');
	}

	// --------------------------------------------------------------------

	/**
	* List 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($table = '')
	{
	return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$table."'";
	}

	// --------------------------------------------------------------------

	/**
	* Field data query
	*
	* Generates a platform-specific query so that the column data can be retrieved
	*
	* @param string the table name
	* @return string
	*/
	protected function _field_data($table)
	{
	return 'SELECT TOP 1 * FROM '.$this->protect_identifiers($table);
	}

	// --------------------------------------------------------------------

	/**
	* Error
	*
	* Returns an array containing code and message of the last
	* database error that has occured.
	*
	* @return array
	*/
	public function error()
	{
	$query = $this->query('SELECT @@ERROR AS code');
	$query = $query->row();
	return array('code' => $query->code, 'message' => mssql_get_last_message());
	}

	// --------------------------------------------------------------------

	/**
	* From Tables
	*
	* This function implicitly groups FROM tables so there is no confusion
	* about operator precedence in harmony with SQL standards
	*
	* @param array
	* @return string
	*/
	protected function _from_tables($tables)
	{
	return is_array($tables) ? implode(', ', $tables) : $tables;
	}

	// --------------------------------------------------------------------

	/**
	* 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 (ignored)
	* @param array the limit clause (ignored)
	* @param array the like clause
	* @return string
	*/
	protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE, $like = array())
	{
	foreach($values as $key => $val)
	{
	$valstr[] = $key.' = '.$val;
	}

	$where = empty($where) ? '' : ' WHERE '.implode(' ', $where);

	if ( ! empty($like))
	{
	$where .= ($where === '' ? ' WHERE ' : ' AND ').implode(' ', $like);
	}

	return 'UPDATE '.$table.' SET '.implode(', ', $valstr).' WHERE '.$where;
	}

	// --------------------------------------------------------------------

	/**
	* Truncate statement
	*
	* Generates a platform-specific truncate string from the supplied data
	*
	* If the database does not support the truncate() command,
	* then this method maps to 'DELETE FROM table'
	*
	* @param string the table name
	* @return string
	*/
	protected function _truncate($table)
	{
	return 'TRUNCATE TABLE '.$table;
	}

	// --------------------------------------------------------------------

	/**
	* Delete statement
	*
	* Generates a platform-specific delete string from the supplied data
	*
	* @param string the table name
	* @param array the where clause
	* @param array the like clause
	* @param string the limit clause
	* @return string
	*/
	protected function _delete($table, $where = array(), $like = array(), $limit = FALSE)
	{
	$conditions = array();

	empty($where) OR $conditions[] = implode(' ', $where);
	empty($like) OR $conditions[] = implode(' ', $like);

	$conditions = (count($conditions) > 0) ? ' WHERE '.implode(' AND ', $conditions) : '';

	return ($limit)
	? 'WITH ci_delete AS (SELECT TOP '.$limit.' * FROM '.$table.$conditions.') DELETE FROM ci_delete'
	: 'DELETE FROM '.$table.$conditions;
	}

	// --------------------------------------------------------------------

	/**
	* Limit string
	*
	* Generates a platform-specific LIMIT clause
	*
	* @param string the sql query string
	* @param int the number of rows to limit the query to
	* @param int the offset value
	* @return string
	*/
	protected function _limit($sql, $limit, $offset)
	{
	// As of SQL Server 2012 (11.0.*) OFFSET is supported
	if (version_compare($this->version(), '11', '>='))
	{
	return $sql.' OFFSET '.(int) $offset.' ROWS FETCH NEXT '.(int) $limit.' ROWS ONLY';
	}

	$limit = $offset + $limit;

	// As of SQL Server 2005 (9.0.*) ROW_NUMBER() is supported,
	// however an ORDER BY clause is required for it to work
	if (version_compare($this->version(), '9', '>=') && $offset && ! empty($this->qb_orderby))
	{
	$orderby = 'ORDER BY '.implode(', ', $this->qb_orderby);

	// We have to strip the ORDER BY clause
	$sql = trim(substr($sql, 0, strrpos($sql, 'ORDER BY '.$orderby)));

	return 'SELECT '.(count($this->qb_select) === 0 ? '*' : implode(', ', $this->qb_select))." FROM (\n"
	.preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.$orderby.') AS '.$this->escape_identifiers('CI_rownum').', ', $sql)
	."\n) ".$this->escape_identifiers('CI_subquery')
	."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.((int) $offset + 1).' AND '.$limit;
	}

	return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql);
	}

	// --------------------------------------------------------------------

	/**
	* Close DB Connection
	*
	* @return void
	*/
	protected function _close()
	{
	@mssql_close($this->conn_id);
	}

	}

	/* End of file mssql_driver.php */
	/* Location: ./system/database/drivers/mssql/mssql_driver.php */