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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');/*** CodeIgniter** An open source application development framework for PHP 5.1.6 or newer** @package CodeIgniter* @author ExpressionEngine Dev Team* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.* @license http://codeigniter.com/user_guide/license.html* @link http://codeigniter.com* @since Version 1.0* @filesource*/// ------------------------------------------------------------------------/*** SQLSRV Database Adapter Class** Note: _DB is an extender class that the app controller* creates dynamically based on whether the active record* class is being used or not.** @package CodeIgniter* @subpackage Drivers* @category Database* @author ExpressionEngine Dev Team* @link http://codeigniter.com/user_guide/database/*/class CI_DB_sqlsrv_driver extends CI_DB {var $dbdriver = 'sqlsrv';// The character used for escapingvar $_escape_char = '';// clause and character used for LIKE escape sequencesvar $_like_escape_str = " ESCAPE '%s' ";var $_like_escape_chr = '!';/*** The syntax to count rows is slightly different across different* database engines, so this string appears in each driver and is* used for the count_all() and count_all_results() functions.*/var $_count_string = "SELECT COUNT(*) AS ";var $_random_keyword = ' ASC'; // not currently supported/*** Non-persistent database connection** @access private called by the base class* @return resource*/function db_connect($pooling = false){// Check for a UTF-8 charset being passed as CI's default 'utf8'.$character_set = (0 === strcasecmp('utf8', $this->char_set)) ? 'UTF-8' : $this->char_set;$connection = array('UID' => empty($this->username) ? '' : $this->username,'PWD' => empty($this->password) ? '' : $this->password,'Database' => $this->database,'ConnectionPooling' => $pooling ? 1 : 0,'CharacterSet' => $character_set,'ReturnDatesAsStrings' => 1);// If the username and password are both empty, assume this is a// 'Windows Authentication Mode' connection.if(empty($connection['UID']) && empty($connection['PWD'])) {unset($connection['UID'], $connection['PWD']);}return sqlsrv_connect($this->hostname, $connection);}// --------------------------------------------------------------------/*** Persistent database connection** @access private called by the base class* @return resource*/function db_pconnect(){$this->db_connect(TRUE);}// --------------------------------------------------------------------/*** Reconnect** Keep / reestablish the db connection if no queries have been* sent for a length of time exceeding the server's idle timeout** @access public* @return void*/function reconnect(){// not implemented in MSSQL}// --------------------------------------------------------------------/*** Select the database** @access private called by the base class* @return resource*/function db_select(){return $this->_execute('USE ' . $this->database);}// --------------------------------------------------------------------/*** Set client character set** @access public* @param string* @param string* @return resource*/function db_set_charset($charset, $collation){// @todo - add support if neededreturn TRUE;}// --------------------------------------------------------------------/*** Execute the query** @access private called by the base class* @param string an SQL query* @return resource*/function _execute($sql){$sql = $this->_prep_query($sql);return sqlsrv_query($this->conn_id, $sql, null, array('Scrollable' => SQLSRV_CURSOR_STATIC,'SendStreamParamsAtExec' => true));}// --------------------------------------------------------------------/*** Prep the query** If needed, each database adapter can prep the query string** @access private called by execute()* @param string an SQL query* @return string*/function _prep_query($sql){return $sql;}// --------------------------------------------------------------------/*** Begin Transaction** @access public* @return bool*/function trans_begin($test_mode = FALSE){if ( ! $this->trans_enabled){return TRUE;}// When transactions are nested we only begin/commit/rollback the outermost onesif ($this->_trans_depth > 0){return TRUE;}// Reset the transaction failure flag.// If the $test_mode flag is set to TRUE transactions will be rolled back// even if the queries produce a successful result.$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;return sqlsrv_begin_transaction($this->conn_id);}// --------------------------------------------------------------------/*** Commit Transaction** @access public* @return bool*/function trans_commit(){if ( ! $this->trans_enabled){return TRUE;}// When transactions are nested we only begin/commit/rollback the outermost onesif ($this->_trans_depth > 0){return TRUE;}return sqlsrv_commit($this->conn_id);}// --------------------------------------------------------------------/*** Rollback Transaction** @access public* @return bool*/function trans_rollback(){if ( ! $this->trans_enabled){return TRUE;}// When transactions are nested we only begin/commit/rollback the outermost onesif ($this->_trans_depth > 0){return TRUE;}return sqlsrv_rollback($this->conn_id);}// --------------------------------------------------------------------/*** Escape String** @access public* @param string* @param bool whether or not the string will be used in a LIKE condition* @return string*/function escape_str($str, $like = FALSE){// Escape single quotesreturn str_replace("'", "''", $str);}// --------------------------------------------------------------------/*** Affected Rows** @access public* @return integer*/function affected_rows(){return @sqlrv_rows_affected($this->conn_id);}// --------------------------------------------------------------------/*** Insert ID** Returns the last id created in the Identity column.** @access public* @return integer*/function insert_id(){return $this->query('select @@IDENTITY as insert_id')->row('insert_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 $ver_info[1]; // return the major version b/c that's all we're interested in.}// --------------------------------------------------------------------/*** Version number query string** @access public* @return string*/function _version(){$info = sqlsrv_server_info($this->conn_id);return sprintf("select '%s' as ver", $info['SQLServerVersion']);}// --------------------------------------------------------------------/*** "Count All" query** Generates a platform-specific query string that counts all records in* the specified database** @access public* @param string* @return string*/function count_all($table = ''){if ($table == '')return '0';$query = $this->query("SELECT COUNT(*) AS numrows FROM " . $this->dbprefix . $table);if ($query->num_rows() == 0)return '0';$row = $query->row();$this->_reset_select();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){return "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";}// --------------------------------------------------------------------/*** List column query** Generates a platform-specific query string so that the column names can be fetched** @access private* @param string the table name* @return string*/function _list_columns($table = ''){return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$this->_escape_table($table)."'";}// --------------------------------------------------------------------/*** Field data query** Generates a platform-specific query so that the column data can be retrieved** @access public* @param string the table name* @return object*/function _field_data($table){return "SELECT TOP 1 * FROM " . $this->_escape_table($table);}// --------------------------------------------------------------------/*** The error message string** @access private* @return string*/function _error_message(){$error = array_shift(sqlsrv_errors());return !empty($error['message']) ? $error['message'] : null;}// --------------------------------------------------------------------/*** The error message number** @access private* @return integer*/function _error_number(){$error = array_shift(sqlsrv_errors());return isset($error['SQLSTATE']) ? $error['SQLSTATE'] : null;}// --------------------------------------------------------------------/*** Escape Table Name** This function adds backticks if the table name has a period* in it. Some DBs will get cranky unless periods are escaped** @access private* @param string the table name* @return string*/function _escape_table($table){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 */