599 lines
13 KiB
PHP
599 lines
13 KiB
PHP
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<?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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* SQLSRV 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_sqlsrv_driver extends CI_DB {
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var $dbdriver = 'sqlsrv';
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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 $_random_keyword = ' ASC'; // not currently supported
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/**
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* Non-persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_connect($pooling = false)
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{
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// Check for a UTF-8 charset being passed as CI's default 'utf8'.
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$character_set = (0 === strcasecmp('utf8', $this->char_set)) ? 'UTF-8' : $this->char_set;
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$connection = array(
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'UID' => empty($this->username) ? '' : $this->username,
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'PWD' => empty($this->password) ? '' : $this->password,
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'Database' => $this->database,
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'ConnectionPooling' => $pooling ? 1 : 0,
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'CharacterSet' => $character_set,
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'ReturnDatesAsStrings' => 1
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);
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// If the username and password are both empty, assume this is a
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// 'Windows Authentication Mode' connection.
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if(empty($connection['UID']) && empty($connection['PWD'])) {
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unset($connection['UID'], $connection['PWD']);
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}
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return sqlsrv_connect($this->hostname, $connection);
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}
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// --------------------------------------------------------------------
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/**
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* Persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_pconnect()
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{
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$this->db_connect(TRUE);
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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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return $this->_execute('USE ' . $this->database);
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}
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// --------------------------------------------------------------------
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/**
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* Set client character set
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*
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* @access public
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* @param string
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* @param string
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* @return resource
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*/
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function db_set_charset($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 sqlsrv_query($this->conn_id, $sql, null, array(
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'Scrollable' => SQLSRV_CURSOR_STATIC,
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'SendStreamParamsAtExec' => true
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));
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}
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// --------------------------------------------------------------------
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/**
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* Prep the query
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*
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* If needed, each database adapter can prep the query string
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*
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* @access private called by execute()
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* @param string an SQL query
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* @return string
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*/
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function _prep_query($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 = ($test_mode === TRUE) ? TRUE : FALSE;
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return sqlsrv_begin_transaction($this->conn_id);
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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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return sqlsrv_commit($this->conn_id);
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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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return sqlsrv_rollback($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Escape String
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*
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* @access public
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* @param string
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* @param bool whether or not the string will be used in a LIKE condition
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* @return string
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*/
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function escape_str($str, $like = FALSE)
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{
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// Escape single quotes
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return str_replace("'", "''", $str);
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @access public
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* @return integer
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*/
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function affected_rows()
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{
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return @sqlrv_rows_affected($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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return $this->query('select @@IDENTITY as insert_id')->row('insert_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 $ver_info[1]; // return the major version b/c that's all we're interested in.
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}
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// --------------------------------------------------------------------
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/**
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* Version number query string
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*
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* @access public
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* @return string
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*/
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function _version()
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{
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$info = sqlsrv_server_info($this->conn_id);
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return sprintf("select '%s' as ver", $info['SQLServerVersion']);
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}
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// --------------------------------------------------------------------
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/**
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* "Count All" query
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*
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* Generates a platform-specific query string that counts all records in
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* the specified database
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*
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* @access public
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* @param string
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* @return string
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*/
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function count_all($table = '')
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{
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if ($table == '')
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return '0';
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$query = $this->query("SELECT COUNT(*) AS numrows FROM " . $this->dbprefix . $table);
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if ($query->num_rows() == 0)
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return '0';
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$row = $query->row();
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$this->_reset_select();
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return $row->numrows;
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}
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// --------------------------------------------------------------------
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/**
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* List table query
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*
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* Generates a platform-specific query string so that the table names can be fetched
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*
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* @access private
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* @param boolean
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* @return string
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*/
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function _list_tables($prefix_limit = FALSE)
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{
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return "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
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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($table = '')
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{
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return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$this->_escape_table($table)."'";
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}
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// --------------------------------------------------------------------
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/**
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* Field data query
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*
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* Generates a platform-specific query so that the column data can be retrieved
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*
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* @access public
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* @param string the table name
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* @return object
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*/
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function _field_data($table)
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{
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return "SELECT TOP 1 * FROM " . $this->_escape_table($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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$error = array_shift(sqlsrv_errors());
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return !empty($error['message']) ? $error['message'] : null;
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}
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// --------------------------------------------------------------------
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/**
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* The error message number
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*
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* @access private
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* @return integer
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*/
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function _error_number()
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{
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$error = array_shift(sqlsrv_errors());
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return isset($error['SQLSTATE']) ? $error['SQLSTATE'] : null;
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}
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// --------------------------------------------------------------------
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/**
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* Escape Table Name
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*
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* This function adds backticks if the table name has a period
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* in it. Some DBs will get cranky unless periods are escaped
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*
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* @access private
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||
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* @param string the table name
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* @return string
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*/
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function _escape_table($table)
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{
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|
|
return $table;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Escape the SQL Identifiers
|
||
|
|
*
|
||
|
|
* This function escapes column and table names
|
||
|
|
*
|
||
|
|
* @access private
|
||
|
|
* @param string
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
function _escape_identifiers($item)
|
||
|
|
{
|
||
|
|
return $item;
|
||
|
|
}
|
||
|
|
|
||
|
|
// --------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* From Tables
|
||
|
|
*
|
||
|
|
* This function implicitly groups FROM tables so there is no confusion
|
||
|
|
* about operator precedence in harmony with SQL standards
|
||
|
|
*
|
||
|
|
* @access public
|
||
|
|
* @param type
|
||
|
|
* @return type
|
||
|
|
*/
|
||
|
|
function _from_tables($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, $values)
|
||
|
|
{
|
||
|
|
return "INSERT INTO ".$this->_escape_table($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, $where)
|
||
|
|
{
|
||
|
|
foreach($values as $key => $val)
|
||
|
|
{
|
||
|
|
$valstr[] = $key." = ".$val;
|
||
|
|
}
|
||
|
|
|
||
|
|
return "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr)." WHERE ".implode(" ", $where);
|
||
|
|
}
|
||
|
|
|
||
|
|
// --------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Truncate statement
|
||
|
|
*
|
||
|
|
* Generates a platform-specific truncate string from the supplied data
|
||
|
|
* If the database does not support the truncate() command
|
||
|
|
* This function maps to "DELETE FROM table"
|
||
|
|
*
|
||
|
|
* @access public
|
||
|
|
* @param string the table name
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
function _truncate($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, $where)
|
||
|
|
{
|
||
|
|
return "DELETE FROM ".$this->_escape_table($table)." WHERE ".implode(" ", $where);
|
||
|
|
}
|
||
|
|
|
||
|
|
// --------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Limit string
|
||
|
|
*
|
||
|
|
* Generates a platform-specific LIMIT clause
|
||
|
|
*
|
||
|
|
* @access public
|
||
|
|
* @param string the sql query string
|
||
|
|
* @param integer the number of rows to limit the query to
|
||
|
|
* @param integer the offset value
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
function _limit($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)
|
||
|
|
{
|
||
|
|
@sqlsrv_close($conn_id);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/* End of file mssql_driver.php */
|
||
|
|
/* Location: ./system/database/drivers/mssql/mssql_driver.php */
|