667 lines
14 KiB
PHP
667 lines
14 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* MS SQL Database Adapter Class
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*
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* Note: _DB is an extender class that the app controller
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* creates dynamically based on whether the active record
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* class is being used or not.
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*
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* @package CodeIgniter
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* @subpackage Drivers
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* @category Database
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/database/
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*/
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class CI_DB_mssql_driver extends CI_DB {
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var $dbdriver = 'mssql';
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// The character used for escaping
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var $_escape_char = '';
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// clause and character used for LIKE escape sequences
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var $_like_escape_str = " ESCAPE '%s' ";
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var $_like_escape_chr = '!';
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/**
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* The syntax to count rows is slightly different across different
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* database engines, so this string appears in each driver and is
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* used for the count_all() and count_all_results() functions.
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*/
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var $_count_string = "SELECT COUNT(*) AS ";
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var $_random_keyword = ' ASC'; // not currently supported
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/**
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* Non-persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_connect()
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{
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if ($this->port != '')
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{
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$this->hostname .= ','.$this->port;
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}
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return @mssql_connect($this->hostname, $this->username, $this->password);
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}
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// --------------------------------------------------------------------
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/**
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* Persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_pconnect()
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{
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if ($this->port != '')
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{
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$this->hostname .= ','.$this->port;
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}
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return @mssql_pconnect($this->hostname, $this->username, $this->password);
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}
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// --------------------------------------------------------------------
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/**
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* Reconnect
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*
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* Keep / reestablish the db connection if no queries have been
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* sent for a length of time exceeding the server's idle timeout
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*
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* @access public
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* @return void
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*/
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function reconnect()
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{
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// not implemented in MSSQL
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}
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// --------------------------------------------------------------------
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/**
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* Select the database
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_select()
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{
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// Note: The brackets are required in the event that the DB name
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// contains reserved characters
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return @mssql_select_db('['.$this->database.']', $this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Set client character set
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*
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* @access public
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* @param string
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* @param string
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* @return resource
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*/
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function db_set_charset($charset, $collation)
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{
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// @todo - add support if needed
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Execute the query
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*
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* @access private called by the base class
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* @param string an SQL query
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* @return resource
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*/
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function _execute($sql)
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{
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$sql = $this->_prep_query($sql);
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return @mssql_query($sql, $this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Prep the query
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*
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* If needed, each database adapter can prep the query string
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*
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* @access private called by execute()
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* @param string an SQL query
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* @return string
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*/
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function _prep_query($sql)
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{
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Begin Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_begin($test_mode = FALSE)
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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// Reset the transaction failure flag.
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// If the $test_mode flag is set to TRUE transactions will be rolled back
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// even if the queries produce a successful result.
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$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;
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$this->simple_query('BEGIN TRAN');
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Commit Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_commit()
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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$this->simple_query('COMMIT TRAN');
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Rollback Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_rollback()
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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$this->simple_query('ROLLBACK TRAN');
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Escape String
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*
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* @access public
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* @param string
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* @param bool whether or not the string will be used in a LIKE condition
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* @return string
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*/
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function escape_str($str, $like = FALSE)
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{
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if (is_array($str))
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{
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foreach ($str as $key => $val)
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{
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$str[$key] = $this->escape_str($val, $like);
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}
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return $str;
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}
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// Escape single quotes
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$str = str_replace("'", "''", remove_invisible_characters($str));
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// escape LIKE condition wildcards
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if ($like === TRUE)
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{
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$str = str_replace(
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array($this->_like_escape_chr, '%', '_'),
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array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'),
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$str
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);
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}
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return $str;
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @access public
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* @return integer
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*/
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function affected_rows()
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{
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return @mssql_rows_affected($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Insert ID
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*
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* Returns the last id created in the Identity column.
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*
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* @access public
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* @return integer
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*/
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function insert_id()
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{
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$ver = self::_parse_major_version($this->version());
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$sql = ($ver >= 8 ? "SELECT SCOPE_IDENTITY() AS last_id" : "SELECT @@IDENTITY AS last_id");
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$query = $this->query($sql);
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$row = $query->row();
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return $row->last_id;
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}
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// --------------------------------------------------------------------
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/**
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* Parse major version
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*
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* Grabs the major version number from the
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* database server version string passed in.
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*
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* @access private
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* @param string $version
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* @return int16 major version number
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*/
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function _parse_major_version($version)
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{
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preg_match('/([0-9]+)\.([0-9]+)\.([0-9]+)/', $version, $ver_info);
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return $ver_info[1]; // return the major version b/c that's all we're interested in.
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}
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// --------------------------------------------------------------------
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/**
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* Version number query string
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*
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* @access public
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* @return string
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*/
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function _version()
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{
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return "SELECT @@VERSION AS ver";
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}
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// --------------------------------------------------------------------
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/**
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* "Count All" query
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*
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* Generates a platform-specific query string that counts all records in
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* the specified database
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*
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* @access public
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* @param string
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* @return string
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*/
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function count_all($table = '')
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{
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if ($table == '')
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{
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return 0;
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}
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$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows') . " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));
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if ($query->num_rows() == 0)
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{
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return 0;
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}
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$row = $query->row();
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$this->_reset_select();
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return (int) $row->numrows;
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}
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// --------------------------------------------------------------------
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/**
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* List table query
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*
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* Generates a platform-specific query string so that the table names can be fetched
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*
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* @access private
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* @param boolean
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* @return string
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*/
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function _list_tables($prefix_limit = FALSE)
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{
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$sql = "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
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// for future compatibility
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if ($prefix_limit !== FALSE AND $this->dbprefix != '')
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{
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//$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
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return FALSE; // not currently supported
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* List column query
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*
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* Generates a platform-specific query string so that the column names can be fetched
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*
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* @access private
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* @param string the table name
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* @return string
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*/
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function _list_columns($table = '')
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{
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return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$table."'";
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}
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// --------------------------------------------------------------------
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/**
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* Field data query
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*
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* Generates a platform-specific query so that the column data can be retrieved
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*
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* @access public
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* @param string the table name
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* @return object
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*/
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function _field_data($table)
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{
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return "SELECT TOP 1 * FROM ".$table;
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}
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// --------------------------------------------------------------------
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/**
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* The error message string
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*
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* @access private
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* @return string
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*/
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function _error_message()
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{
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return mssql_get_last_message();
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}
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// --------------------------------------------------------------------
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/**
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* The error message number
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*
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* @access private
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* @return integer
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*/
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function _error_number()
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{
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// Are error numbers supported?
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return '';
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}
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// --------------------------------------------------------------------
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/**
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* Escape the SQL Identifiers
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*
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* This function escapes column and table names
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*
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* @access private
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* @param string
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* @return string
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*/
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function _escape_identifiers($item)
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{
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if ($this->_escape_char == '')
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{
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return $item;
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}
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foreach ($this->_reserved_identifiers as $id)
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{
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if (strpos($item, '.'.$id) !== FALSE)
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{
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$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);
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// remove duplicates if the user already included the escape
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return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
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}
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}
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if (strpos($item, '.') !== FALSE)
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{
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$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;
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}
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else
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{
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$str = $this->_escape_char.$item.$this->_escape_char;
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}
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// remove duplicates if the user already included the escape
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return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
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}
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// --------------------------------------------------------------------
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/**
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* From Tables
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*
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* This function implicitly groups FROM tables so there is no confusion
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* about operator precedence in harmony with SQL standards
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*
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* @access public
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* @param type
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* @return type
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*/
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function _from_tables($tables)
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{
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if ( ! is_array($tables))
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{
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$tables = array($tables);
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}
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return implode(', ', $tables);
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}
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// --------------------------------------------------------------------
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/**
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* Insert statement
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*
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* Generates a platform-specific insert string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the insert keys
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* @param array the insert values
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* @return string
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*/
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function _insert($table, $keys, $values)
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{
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return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
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}
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// --------------------------------------------------------------------
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/**
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* Update statement
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*
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* Generates a platform-specific update string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the update data
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* @param array the where clause
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* @param array the orderby clause
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* @param array the limit clause
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* @return string
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*/
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function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
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{
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foreach ($values as $key => $val)
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{
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$valstr[] = $key." = ".$val;
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}
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$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
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$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';
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$sql = "UPDATE ".$table." SET ".implode(', ', $valstr);
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$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';
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$sql .= $orderby.$limit;
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Truncate statement
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*
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* Generates a platform-specific truncate string from the supplied data
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* If the database does not support the truncate() command
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* This function maps to "DELETE FROM table"
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*
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* @access public
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* @param string the table name
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* @return string
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*/
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function _truncate($table)
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{
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return "TRUNCATE ".$table;
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}
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// --------------------------------------------------------------------
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/**
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* Delete statement
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*
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* Generates a platform-specific delete string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the where clause
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* @param string the limit clause
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* @return string
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*/
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function _delete($table, $where = array(), $like = array(), $limit = FALSE)
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{
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$conditions = '';
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if (count($where) > 0 OR count($like) > 0)
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{
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$conditions = "\nWHERE ";
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$conditions .= implode("\n", $this->ar_where);
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if (count($where) > 0 && count($like) > 0)
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{
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$conditions .= " AND ";
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}
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$conditions .= implode("\n", $like);
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}
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$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
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return "DELETE FROM ".$table.$conditions.$limit;
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}
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// --------------------------------------------------------------------
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/**
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* Limit string
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*
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* Generates a platform-specific LIMIT clause
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*
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* @access public
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* @param string the sql query string
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* @param integer the number of rows to limit the query to
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* @param integer the offset value
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* @return string
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*/
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function _limit($sql, $limit, $offset)
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{
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$i = $limit + $offset;
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return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$i.' ', $sql);
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}
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// --------------------------------------------------------------------
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/**
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* Close DB Connection
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*
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* @access public
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* @param resource
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* @return void
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*/
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function _close($conn_id)
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{
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@mssql_close($conn_id);
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}
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}
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/* End of file mssql_driver.php */
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/* Location: ./system/database/drivers/mssql/mssql_driver.php */ |