X-Git-Url: http://git.onelab.eu/?p=www-register-wizard.git;a=blobdiff_plain;f=database%2Fdrivers%2Fmssql%2Fmssql_driver.php;h=a3adabcf45af365553a605294448ffd373ea497c;hp=72dc263f3229b59dff24bff3eb586a965a3cd120;hb=4afb2fe256f094a1caf6bff14f51c6a88938cc9f;hpb=6907967d36358724c676a7998f55fc34e40c3b21

diff --git a/database/drivers/mssql/mssql_driver.php b/database/drivers/mssql/mssql_driver.php
index 72dc263..a3adabc 100644
--- a/database/drivers/mssql/mssql_driver.php
+++ b/database/drivers/mssql/mssql_driver.php
@@ -1,611 +1,611 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
-/**
- * CodeIgniter
- *
- * An open source application development framework for PHP 4.3.2 or newer
- *
- * @package		CodeIgniter
- * @author		ExpressionEngine Dev Team
- * @copyright	Copyright (c) 2008, EllisLab, Inc.
- * @license		http://codeigniter.com/user_guide/license.html
- * @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 active record
- * class is being used or not.
- *
- * @package		CodeIgniter
- * @subpackage	Drivers
- * @category	Database
- * @author		ExpressionEngine Dev Team
- * @link		http://codeigniter.com/user_guide/database/
- */
-class CI_DB_mssql_driver extends CI_DB {
-
-	var $dbdriver = 'mssql';
-	
-	// The character used for escaping
-	var $_escape_char = '';
-	/**
-	 * 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.
-	 */
-	var $_count_string = "SELECT COUNT(*) AS ";
-	var $_random_keyword = ' ASC'; // not currently supported
-
-	/**
-	 * Non-persistent database connection
-	 *
-	 * @access	private called by the base class
-	 * @return	resource
-	 */	
-	function db_connect()
-	{
-		if ($this->port != '')
-		{
-			$this->hostname .= ','.$this->port;
-		}
-
-		return @mssql_connect($this->hostname, $this->username, $this->password);
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Persistent database connection
-	 *
-	 * @access	private called by the base class
-	 * @return	resource
-	 */	
-	function db_pconnect()
-	{
-		if ($this->port != '')
-		{
-			$this->hostname .= ','.$this->port;
-		}
-
-		return @mssql_pconnect($this->hostname, $this->username, $this->password);
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Select the database
-	 *
-	 * @access	private called by the base class
-	 * @return	resource
-	 */	
-	function db_select()
-	{
-		// Note: The brackets are required in the event that the DB name
-		// contains reserved characters
-		return @mssql_select_db('['.$this->database.']', $this->conn_id);
-	}
-
-	// --------------------------------------------------------------------
-	
-	/**
-	 * Set client character set
-	 *
-	 * @access	public
-	 * @param	string
-	 * @param	string
-	 * @return	resource
-	 */
-	function db_set_charset($charset, $collation)
-	{
-		// @todo - add support if needed
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-	
-	/**
-	 * Execute the query
-	 *
-	 * @access	private called by the base class
-	 * @param	string	an SQL query
-	 * @return	resource
-	 */	
-	function _execute($sql)
-	{
-		$sql = $this->_prep_query($sql);
-		return @mssql_query($sql, $this->conn_id);
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Prep the query
-	 *
-	 * If needed, each database adapter can prep the query string
-	 *
-	 * @access	private called by execute()
-	 * @param	string	an SQL query
-	 * @return	string
-	 */	
-	function _prep_query($sql)
-	{
-		return $sql;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Begin Transaction
-	 *
-	 * @access	public
-	 * @return	bool		
-	 */	
-	function trans_begin($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->simple_query('BEGIN TRAN');
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Commit Transaction
-	 *
-	 * @access	public
-	 * @return	bool		
-	 */	
-	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;
-		}
-
-		$this->simple_query('COMMIT TRAN');
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Rollback Transaction
-	 *
-	 * @access	public
-	 * @return	bool		
-	 */	
-	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;
-		}
-
-		$this->simple_query('ROLLBACK TRAN');
-		return TRUE;
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Escape String
-	 *
-	 * @access	public
-	 * @param	string
-	 * @return	string
-	 */
-	function escape_str($str)	
-	{
-		// Access the CI object
-		$CI =& get_instance();
-		
-		// Escape single quotes
-		return str_replace("'", "''", $CI->input->_remove_invisible_characters($str));
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Affected Rows
-	 *
-	 * @access	public
-	 * @return	integer
-	 */
-	function affected_rows()
-	{
-		return @mssql_rows_affected($this->conn_id);
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	* Insert ID
-	*
-	* Returns the last id created in the Identity column.
-	*
-	* @access public
-	* @return integer
-	*/
-	function insert_id()
-	{
-		$ver = self::_parse_major_version($this->version());
-		$sql = ($ver >= 8 ? "SELECT SCOPE_IDENTITY() AS last_id" : "SELECT @@IDENTITY AS last_id");
-		$query = $this->query($sql);
-		$row = $query->row();
-		return $row->last_id;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Parse major version
-	*
-	* Grabs the major version number from the 
-	* database server version string passed in.
-	*
-	* @access private
-	* @param string $version
-	* @return int16 major version number
-	*/
-	function _parse_major_version($version)
-	{
-		preg_match('/([0-9]+)\.([0-9]+)\.([0-9]+)/', $version, $ver_info);
-		return $ver_info[1]; // return the major version b/c that's all we're interested in.
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Version number query string
-	*
-	* @access public
-	* @return string
-	*/
-	function _version()
-	{
-		return "SELECT @@VERSION AS ver";
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * "Count All" query
-	 *
-	 * Generates a platform-specific query string that counts all records in
-	 * the specified database
-	 *
-	 * @access	public
-	 * @param	string
-	 * @return	string
-	 */
-	function count_all($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();
-		return $row->numrows;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * List table query
-	 *
-	 * Generates a platform-specific query string so that the table names can be fetched
-	 *
-	 * @access	private
-	 * @param	boolean
-	 * @return	string
-	 */
-	function _list_tables($prefix_limit = FALSE)
-	{
-		$sql = "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
-		
-		// for future compatibility
-		if ($prefix_limit !== FALSE AND $this->dbprefix != '')
-		{
-			//$sql .= " LIKE '".$this->dbprefix."%'";
-			return FALSE; // not currently supported
-		}
-		
-		return $sql;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * List column query
-	 *
-	 * Generates a platform-specific query string so that the column names can be fetched
-	 *
-	 * @access	private
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	function _list_columns($table = '')
-	{
-		return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$table."'";	
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Field data query
-	 *
-	 * Generates a platform-specific query so that the column data can be retrieved
-	 *
-	 * @access	public
-	 * @param	string	the table name
-	 * @return	object
-	 */
-	function _field_data($table)
-	{
-		return "SELECT TOP 1 * FROM ".$table;	
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * The error message string
-	 *
-	 * @access	private
-	 * @return	string
-	 */
-	function _error_message()
-	{
-		// Are errros even supported in MS SQL?
-		return '';
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * The error message number
-	 *
-	 * @access	private
-	 * @return	integer
-	 */
-	function _error_number()
-	{
-		// Are error numbers supported?
-		return '';
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Escape the SQL Identifiers
-	 *
-	 * This function escapes column and table names
-	 *
-	 * @access	private
-	 * @param	string
-	 * @return	string
-	 */
-	function _escape_identifiers($item)
-	{
-		if ($this->_escape_char == '')
-		{
-			return $item;
-		}
-	
-		if (strpos($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, $str);
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * From Tables
-	 *
-	 * This function implicitly groups FROM tables so there is no confusion
-	 * about operator precedence in harmony with SQL standards
-	 *
-	 * @access	public
-	 * @param	type
-	 * @return	type
-	 */
-	function _from_tables($tables)
-	{
-		if ( ! is_array($tables))
-		{
-			$tables = array($tables);
-		}
-		
-		return implode(', ', $tables);
-	}
-
-	// --------------------------------------------------------------------
-	
-	/**
-	 * Insert statement
-	 *
-	 * Generates a platform-specific insert string from the supplied data
-	 *
-	 * @access	public
-	 * @param	string	the table name
-	 * @param	array	the insert keys
-	 * @param	array	the insert values
-	 * @return	string
-	 */
-	function _insert($table, $keys, $values)
-	{	
-		return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Update statement
-	 *
-	 * Generates a platform-specific update string from the supplied data
-	 *
-	 * @access	public
-	 * @param	string	the table name
-	 * @param	array	the update data
-	 * @param	array	the where clause
-	 * @param	array	the orderby clause
-	 * @param	array	the limit clause
-	 * @return	string
-	 */
-	function _update($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 .= $orderby.$limit;
-		
-		return $sql;
-	}
-
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Truncate statement
-	 *
-	 * Generates a platform-specific truncate string from the supplied data
-	 * If the database does not support the truncate() command
-	 * This function maps to "DELETE FROM table"
-	 *
-	 * @access	public
-	 * @param	string	the table name
-	 * @return	string
-	 */	
-	function _truncate($table)
-	{
-		return "TRUNCATE ".$table;
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Delete statement
-	 *
-	 * Generates a platform-specific delete string from the supplied data
-	 *
-	 * @access	public
-	 * @param	string	the table name
-	 * @param	array	the where clause
-	 * @param	string	the limit clause
-	 * @return	string
-	 */	
-	function _delete($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.$limit;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Limit string
-	 *
-	 * Generates a platform-specific LIMIT clause
-	 *
-	 * @access	public
-	 * @param	string	the sql query string
-	 * @param	integer	the number of rows to limit the query to
-	 * @param	integer	the offset value
-	 * @return	string
-	 */
-	function _limit($sql, $limit, $offset)
-	{
-		$i = $limit + $offset;
-	
-		return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$i.' ', $sql);		
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Close DB Connection
-	 *
-	 * @access	public
-	 * @param	resource
-	 * @return	void
-	 */
-	function _close($conn_id)
-	{
-		@mssql_close($conn_id);
-	}	
-
-}
-
-
-
-/* End of file mssql_driver.php */
+<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package		CodeIgniter
+ * @author		ExpressionEngine Dev Team
+ * @copyright	Copyright (c) 2008, EllisLab, Inc.
+ * @license		http://codeigniter.com/user_guide/license.html
+ * @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 active record
+ * class is being used or not.
+ *
+ * @package		CodeIgniter
+ * @subpackage	Drivers
+ * @category	Database
+ * @author		ExpressionEngine Dev Team
+ * @link		http://codeigniter.com/user_guide/database/
+ */
+class CI_DB_mssql_driver extends CI_DB {
+
+	var $dbdriver = 'mssql';
+	
+	// The character used for escaping
+	var $_escape_char = '';
+	/**
+	 * 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.
+	 */
+	var $_count_string = "SELECT COUNT(*) AS ";
+	var $_random_keyword = ' ASC'; // not currently supported
+
+	/**
+	 * Non-persistent database connection
+	 *
+	 * @access	private called by the base class
+	 * @return	resource
+	 */	
+	function db_connect()
+	{
+		if ($this->port != '')
+		{
+			$this->hostname .= ','.$this->port;
+		}
+
+		return @mssql_connect($this->hostname, $this->username, $this->password);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Persistent database connection
+	 *
+	 * @access	private called by the base class
+	 * @return	resource
+	 */	
+	function db_pconnect()
+	{
+		if ($this->port != '')
+		{
+			$this->hostname .= ','.$this->port;
+		}
+
+		return @mssql_pconnect($this->hostname, $this->username, $this->password);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Select the database
+	 *
+	 * @access	private called by the base class
+	 * @return	resource
+	 */	
+	function db_select()
+	{
+		// Note: The brackets are required in the event that the DB name
+		// contains reserved characters
+		return @mssql_select_db('['.$this->database.']', $this->conn_id);
+	}
+
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Set client character set
+	 *
+	 * @access	public
+	 * @param	string
+	 * @param	string
+	 * @return	resource
+	 */
+	function db_set_charset($charset, $collation)
+	{
+		// @todo - add support if needed
+		return TRUE;
+	}
+
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Execute the query
+	 *
+	 * @access	private called by the base class
+	 * @param	string	an SQL query
+	 * @return	resource
+	 */	
+	function _execute($sql)
+	{
+		$sql = $this->_prep_query($sql);
+		return @mssql_query($sql, $this->conn_id);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Prep the query
+	 *
+	 * If needed, each database adapter can prep the query string
+	 *
+	 * @access	private called by execute()
+	 * @param	string	an SQL query
+	 * @return	string
+	 */	
+	function _prep_query($sql)
+	{
+		return $sql;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Begin Transaction
+	 *
+	 * @access	public
+	 * @return	bool		
+	 */	
+	function trans_begin($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->simple_query('BEGIN TRAN');
+		return TRUE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Commit Transaction
+	 *
+	 * @access	public
+	 * @return	bool		
+	 */	
+	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;
+		}
+
+		$this->simple_query('COMMIT TRAN');
+		return TRUE;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Rollback Transaction
+	 *
+	 * @access	public
+	 * @return	bool		
+	 */	
+	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;
+		}
+
+		$this->simple_query('ROLLBACK TRAN');
+		return TRUE;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Escape String
+	 *
+	 * @access	public
+	 * @param	string
+	 * @return	string
+	 */
+	function escape_str($str)	
+	{
+		// Access the CI object
+		$CI =& get_instance();
+		
+		// Escape single quotes
+		return str_replace("'", "''", $CI->input->_remove_invisible_characters($str));
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Affected Rows
+	 *
+	 * @access	public
+	 * @return	integer
+	 */
+	function affected_rows()
+	{
+		return @mssql_rows_affected($this->conn_id);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	* Insert ID
+	*
+	* Returns the last id created in the Identity column.
+	*
+	* @access public
+	* @return integer
+	*/
+	function insert_id()
+	{
+		$ver = self::_parse_major_version($this->version());
+		$sql = ($ver >= 8 ? "SELECT SCOPE_IDENTITY() AS last_id" : "SELECT @@IDENTITY AS last_id");
+		$query = $this->query($sql);
+		$row = $query->row();
+		return $row->last_id;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	* Parse major version
+	*
+	* Grabs the major version number from the 
+	* database server version string passed in.
+	*
+	* @access private
+	* @param string $version
+	* @return int16 major version number
+	*/
+	function _parse_major_version($version)
+	{
+		preg_match('/([0-9]+)\.([0-9]+)\.([0-9]+)/', $version, $ver_info);
+		return $ver_info[1]; // return the major version b/c that's all we're interested in.
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	* Version number query string
+	*
+	* @access public
+	* @return string
+	*/
+	function _version()
+	{
+		return "SELECT @@VERSION AS ver";
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * "Count All" query
+	 *
+	 * Generates a platform-specific query string that counts all records in
+	 * the specified database
+	 *
+	 * @access	public
+	 * @param	string
+	 * @return	string
+	 */
+	function count_all($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();
+		return $row->numrows;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * List table query
+	 *
+	 * Generates a platform-specific query string so that the table names can be fetched
+	 *
+	 * @access	private
+	 * @param	boolean
+	 * @return	string
+	 */
+	function _list_tables($prefix_limit = FALSE)
+	{
+		$sql = "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
+		
+		// for future compatibility
+		if ($prefix_limit !== FALSE AND $this->dbprefix != '')
+		{
+			//$sql .= " LIKE '".$this->dbprefix."%'";
+			return FALSE; // not currently supported
+		}
+		
+		return $sql;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * List column query
+	 *
+	 * Generates a platform-specific query string so that the column names can be fetched
+	 *
+	 * @access	private
+	 * @param	string	the table name
+	 * @return	string
+	 */
+	function _list_columns($table = '')
+	{
+		return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$table."'";	
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Field data query
+	 *
+	 * Generates a platform-specific query so that the column data can be retrieved
+	 *
+	 * @access	public
+	 * @param	string	the table name
+	 * @return	object
+	 */
+	function _field_data($table)
+	{
+		return "SELECT TOP 1 * FROM ".$table;	
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * The error message string
+	 *
+	 * @access	private
+	 * @return	string
+	 */
+	function _error_message()
+	{
+		// Are errros even supported in MS SQL?
+		return '';
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * The error message number
+	 *
+	 * @access	private
+	 * @return	integer
+	 */
+	function _error_number()
+	{
+		// Are error numbers supported?
+		return '';
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Escape the SQL Identifiers
+	 *
+	 * This function escapes column and table names
+	 *
+	 * @access	private
+	 * @param	string
+	 * @return	string
+	 */
+	function _escape_identifiers($item)
+	{
+		if ($this->_escape_char == '')
+		{
+			return $item;
+		}
+	
+		if (strpos($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, $str);
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * From Tables
+	 *
+	 * This function implicitly groups FROM tables so there is no confusion
+	 * about operator precedence in harmony with SQL standards
+	 *
+	 * @access	public
+	 * @param	type
+	 * @return	type
+	 */
+	function _from_tables($tables)
+	{
+		if ( ! is_array($tables))
+		{
+			$tables = array($tables);
+		}
+		
+		return implode(', ', $tables);
+	}
+
+	// --------------------------------------------------------------------
+	
+	/**
+	 * Insert statement
+	 *
+	 * Generates a platform-specific insert string from the supplied data
+	 *
+	 * @access	public
+	 * @param	string	the table name
+	 * @param	array	the insert keys
+	 * @param	array	the insert values
+	 * @return	string
+	 */
+	function _insert($table, $keys, $values)
+	{	
+		return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Update statement
+	 *
+	 * Generates a platform-specific update string from the supplied data
+	 *
+	 * @access	public
+	 * @param	string	the table name
+	 * @param	array	the update data
+	 * @param	array	the where clause
+	 * @param	array	the orderby clause
+	 * @param	array	the limit clause
+	 * @return	string
+	 */
+	function _update($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 .= $orderby.$limit;
+		
+		return $sql;
+	}
+
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Truncate statement
+	 *
+	 * Generates a platform-specific truncate string from the supplied data
+	 * If the database does not support the truncate() command
+	 * This function maps to "DELETE FROM table"
+	 *
+	 * @access	public
+	 * @param	string	the table name
+	 * @return	string
+	 */	
+	function _truncate($table)
+	{
+		return "TRUNCATE ".$table;
+	}
+	
+	// --------------------------------------------------------------------
+
+	/**
+	 * Delete statement
+	 *
+	 * Generates a platform-specific delete string from the supplied data
+	 *
+	 * @access	public
+	 * @param	string	the table name
+	 * @param	array	the where clause
+	 * @param	string	the limit clause
+	 * @return	string
+	 */	
+	function _delete($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.$limit;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Limit string
+	 *
+	 * Generates a platform-specific LIMIT clause
+	 *
+	 * @access	public
+	 * @param	string	the sql query string
+	 * @param	integer	the number of rows to limit the query to
+	 * @param	integer	the offset value
+	 * @return	string
+	 */
+	function _limit($sql, $limit, $offset)
+	{
+		$i = $limit + $offset;
+	
+		return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$i.' ', $sql);		
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Close DB Connection
+	 *
+	 * @access	public
+	 * @param	resource
+	 * @return	void
+	 */
+	function _close($conn_id)
+	{
+		@mssql_close($conn_id);
+	}	
+
+}
+
+
+
+/* End of file mssql_driver.php */
 /* Location: ./system/database/drivers/mssql/mssql_driver.php */
\ No newline at end of file