system/database/drivers/sqlsrv/sqlsrv_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
  */

 /**
  * SQLSRV 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_sqlsrv_driver extends CI_DB {

 	public $dbdriver = 'sqlsrv';

 	// The character used for escaping
 	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 = ' NEWID()'; // not currently supported

 	/**
 	 * Non-persistent database connection
 	 *
 	 * @return	resource
 	 */
 	public function db_connect($pooling = FALSE)
 	{
 		// Check for a UTF-8 charset being passed as CI's default 'utf8'.
 		$character_set = (0 === strcasecmp('utf8', $this->char_set)) ? 'UTF-8' : $this->char_set;

 		$connection = array(
 			'UID'			=> empty($this->username) ? '' : $this->username,
 			'PWD'			=> empty($this->password) ? '' : $this->password,
 			'Database'		=> $this->database,
 			'ConnectionPooling'	=> $pooling ? 1 : 0,
 			'CharacterSet'		=> $character_set,
 			'ReturnDatesAsStrings'	=> 1
 		);

 		// If the username and password are both empty, assume this is a
 		// 'Windows Authentication Mode' connection.
 		if (empty($connection['UID']) && empty($connection['PWD']))
 		{
 			unset($connection['UID'], $connection['PWD']);
 		}

 		return sqlsrv_connect($this->hostname, $connection);
 	}

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

 	/**
 	 * 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;
 		}

 		if ($this->_execute('USE '.$database))
 		{
 			$this->database = $database;
 			return TRUE;
 		}

 		return FALSE;
 	}

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

 	/**
 	 * Execute the query
 	 *
 	 * @param	string	an SQL query
 	 * @return	resource
 	 */
 	protected function _execute($sql)
 	{
 		return sqlsrv_query($this->conn_id,
 					$sql,
 					NULL,
 					array('Scrollable'=> SQLSRV_CURSOR_STATIC, 'SendStreamParamsAtExec' => TRUE)
 			);
 	}

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

 	/**
 	 * 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;

 		return sqlsrv_begin_transaction($this->conn_id);
 	}

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

 	/**
 	 * 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 sqlsrv_commit($this->conn_id);
 	}

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

 	/**
 	 * 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 sqlsrv_rollback($this->conn_id);
 	}

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

 	/**
 	 * 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)
 	{
 		// Escape single quotes
 		return str_replace("'", "''", $str);
 	}

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

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

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

 	/**
 	 * Insert ID
 	 *
 	 * Returns the last id created in the Identity column.
 	 *
 	 * @return	string
 	 */
 	public function insert_id()
 	{
 		$query = $this->query('SELECT @@IDENTITY AS insert_id');
 		$query = $query->row();
 		return $query->insert_id;
 	}

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

 	/**
 	 * Database version number
 	 *
 	 * @return	string
 	 */
 	public function version()
 	{
 		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'];
 	}

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

 	/**
 	 * "Count All" query
 	 *
 	 * Generates a platform-specific query string that counts all records in
 	 * the specified database
 	 *
 	 * @param	string
 	 * @return	int
 	 */
 	public function count_all($table = '')
 	{
 		if ($table == '')
 		{
 			return 0;
 		}

 		$query = $this->query("SELECT COUNT(*) AS numrows FROM " . $this->dbprefix . $table);
 		if ($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	bool
 	 * @return	string
 	 */
 	protected function _list_tables($prefix_limit = FALSE)
 	{
 		return "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY 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($table)
 	{
 		return 'SELECT TOP 1 * FROM '.$table;
 	}

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

 	/**
 	 * Error
 	 *
 	 * Returns an array containing code and message of the last
 	 * database error that has occured.
 	 *
 	 * @return	array
 	 */
 	public function error()
 	{
 		$error = array('code' => '00000', 'message' => '');
 		$sqlsrv_errors = sqlsrv_errors(SQLSRV_ERR_ERRORS);

 		if ( ! is_array($sqlsrv_errors))
 		{
 			return $error;
 		}

 		$sqlsrv_error = array_shift($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;
 	}

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

 	/**
 	 * Escape the SQL Identifiers
 	 *
 	 * This function escapes column and table names
 	 *
 	 * @param	string
 	 * @return	string
 	 */
 	public function _escape_identifiers($item)
 	{
 		return $item;
 	}

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

 	/**
 	 * 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($tables)
 	{
 		if ( ! is_array($tables))
 		{
 			$tables = array($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, $where)
 	{
 		foreach($values as $key => $val)
 		{
 			$valstr[] = $key." = ".$val;
 		}

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

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

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

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

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

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

 	/**
 	 * Close DB Connection
 	 *
 	 * @param	resource
 	 * @return	void
 	 */
 	protected function _close($conn_id)
 	{
 		@sqlsrv_close($conn_id);
 	}

 }

 /* End of file sqlsrv_driver.php */
 /* Location: ./system/database/drivers/sqlsrv/sqlsrv_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
	*/

	/**
	* SQLSRV 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_sqlsrv_driver extends CI_DB {

	public $dbdriver = 'sqlsrv';

	// The character used for escaping
	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 = ' NEWID()'; // not currently supported

	/**
	* Non-persistent database connection
	*
	* @return resource
	*/
	public function db_connect($pooling = FALSE)
	{
	// Check for a UTF-8 charset being passed as CI's default 'utf8'.
	$character_set = (0 === strcasecmp('utf8', $this->char_set)) ? 'UTF-8' : $this->char_set;

	$connection = array(
	'UID' => empty($this->username) ? '' : $this->username,
	'PWD' => empty($this->password) ? '' : $this->password,
	'Database' => $this->database,
	'ConnectionPooling' => $pooling ? 1 : 0,
	'CharacterSet' => $character_set,
	'ReturnDatesAsStrings' => 1
	);

	// If the username and password are both empty, assume this is a
	// 'Windows Authentication Mode' connection.
	if (empty($connection['UID']) && empty($connection['PWD']))
	{
	unset($connection['UID'], $connection['PWD']);
	}

	return sqlsrv_connect($this->hostname, $connection);
	}

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

	/**
	* 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;
	}

	if ($this->_execute('USE '.$database))
	{
	$this->database = $database;
	return TRUE;
	}

	return FALSE;
	}

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

	/**
	* Execute the query
	*
	* @param string an SQL query
	* @return resource
	*/
	protected function _execute($sql)
	{
	return sqlsrv_query($this->conn_id,
	$sql,
	NULL,
	array('Scrollable'=> SQLSRV_CURSOR_STATIC, 'SendStreamParamsAtExec' => TRUE)
	);
	}

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

	/**
	* 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;

	return sqlsrv_begin_transaction($this->conn_id);
	}

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

	/**
	* 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 sqlsrv_commit($this->conn_id);
	}

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

	/**
	* 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 sqlsrv_rollback($this->conn_id);
	}

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

	/**
	* 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)
	{
	// Escape single quotes
	return str_replace("'", "''", $str);
	}

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

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

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

	/**
	* Insert ID
	*
	* Returns the last id created in the Identity column.
	*
	* @return string
	*/
	public function insert_id()
	{
	$query = $this->query('SELECT @@IDENTITY AS insert_id');
	$query = $query->row();
	return $query->insert_id;
	}

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

	/**
	* Database version number
	*
	* @return string
	*/
	public function version()
	{
	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'];
	}

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

	/**
	* "Count All" query
	*
	* Generates a platform-specific query string that counts all records in
	* the specified database
	*
	* @param string
	* @return int
	*/
	public function count_all($table = '')
	{
	if ($table == '')
	{
	return 0;
	}

	$query = $this->query("SELECT COUNT(*) AS numrows FROM " . $this->dbprefix . $table);
	if ($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 bool
	* @return string
	*/
	protected function _list_tables($prefix_limit = FALSE)
	{
	return "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY 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($table)
	{
	return 'SELECT TOP 1 * FROM '.$table;
	}

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

	/**
	* Error
	*
	* Returns an array containing code and message of the last
	* database error that has occured.
	*
	* @return array
	*/
	public function error()
	{
	$error = array('code' => '00000', 'message' => '');
	$sqlsrv_errors = sqlsrv_errors(SQLSRV_ERR_ERRORS);

	if ( ! is_array($sqlsrv_errors))
	{
	return $error;
	}

	$sqlsrv_error = array_shift($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;
	}

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

	/**
	* Escape the SQL Identifiers
	*
	* This function escapes column and table names
	*
	* @param string
	* @return string
	*/
	public function _escape_identifiers($item)
	{
	return $item;
	}

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

	/**
	* 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($tables)
	{
	if ( ! is_array($tables))
	{
	$tables = array($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, $where)
	{
	foreach($values as $key => $val)
	{
	$valstr[] = $key." = ".$val;
	}

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

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

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

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

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

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

	/**
	* Close DB Connection
	*
	* @param resource
	* @return void
	*/
	protected function _close($conn_id)
	{
	@sqlsrv_close($conn_id);
	}

	}

	/* End of file sqlsrv_driver.php */
	/* Location: ./system/database/drivers/sqlsrv/sqlsrv_driver.php */