/Modifications Since 08/www/events/system/database/drivers/mssql/mssql_driver.php
PHP | 481 lines | 276 code | 43 blank | 162 comment | 7 complexity | 34cd0ae9c054f994124ddc41f88e6dfa MD5 | raw file
- <?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 Rick Ellis
- * @copyright Copyright (c) 2006, EllisLab, Inc.
- * @license http://www.codeignitor.com/user_guide/license.html
- * @link http://www.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 Rick Ellis
- * @link http://www.codeigniter.com/user_guide/database/
- */
- class CI_DB_mssql_driver extends CI_DB {
- /**
- * Non-persistent database connection
- *
- * @access private called by the base class
- * @return resource
- */
- function db_connect()
- {
- return @mssql_connect($this->hostname, $this->username, $this->password);
- }
-
- // --------------------------------------------------------------------
- /**
- * Persistent database connection
- *
- * @access private called by the base class
- * @return resource
- */
- function db_pconnect()
- {
- return @mssql_pconnect($this->hostname, $this->username, $this->password);
- }
-
- // --------------------------------------------------------------------
- /**
- * Select the database
- *
- * @access private called by the base class
- * @return resource
- */
- function db_select()
- {
- return @mssql_select_db($this->database, $this->conn_id);
- }
- // --------------------------------------------------------------------
-
- /**
- * Execute the query
- *
- * @access private called by the base class
- * @param string an SQL query
- * @return resource
- */
- function _execute($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)
- {
- // Escape single quotes
- return str_replace("'", "''", $str);
- }
-
- // --------------------------------------------------------------------
- /**
- * Affected Rows
- *
- * @access public
- * @return integer
- */
- function affected_rows()
- {
- return @mssql_rows_affected($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 = $this->query("SELECT COUNT(*) AS numrows FROM ".$this->dbprefix.$table);
-
- if ($query->num_rows() == 0)
- return '0';
- $row = $query->row();
- return $row->numrows;
- }
- // --------------------------------------------------------------------
- /**
- * List table query
- *
- * Generates a platform-specific query string so that the table names can be fetched
- *
- * @access private
- * @return string
- */
- function _list_tables()
- {
- return "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
- }
- // --------------------------------------------------------------------
- /**
- * List column query
- *
- * Generates a platform-specific query string so that the column names can be fetched
- *
- * @access private
- * @param string the table name
- * @return string
- */
- function _list_columns($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($table);
- }
- // --------------------------------------------------------------------
- /**
- * The error message string
- *
- * @access private
- * @return string
- */
- function _error_message()
- {
- // Are errros even supported in MS SQL?
- return '';
- }
-
- // --------------------------------------------------------------------
- /**
- * The error message number
- *
- * @access private
- * @return integer
- */
- function _error_number()
- {
- // Are error numbers supported?
- return '';
- }
-
- // --------------------------------------------------------------------
- /**
- * Escape Table Name
- *
- * This function adds backticks if the table name has a period
- * in it. Some DBs will get cranky unless periods are escaped
- *
- * @access private
- * @param string the table name
- * @return string
- */
- function _escape_table($table)
- {
- // I don't believe this is necessary with MS SQL. Not sure, though. - Rick
-
- /*
- if (stristr($table, '.'))
- {
- $table = preg_replace("/\./", "`.`", $table);
- }
- */
-
- return $table;
- }
-
- // --------------------------------------------------------------------
- /**
- * Insert statement
- *
- * Generates a platform-specific insert string from the supplied data
- *
- * @access public
- * @param string the table name
- * @param array the insert keys
- * @param array the insert values
- * @return string
- */
- function _insert($table, $keys, $values)
- {
- return "INSERT INTO ".$this->_escape_table($table)." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
- }
-
- // --------------------------------------------------------------------
- /**
- * Update statement
- *
- * Generates a platform-specific update string from the supplied data
- *
- * @access public
- * @param string the table name
- * @param array the update data
- * @param array the where clause
- * @return string
- */
- function _update($table, $values, $where)
- {
- foreach($values as $key => $val)
- {
- $valstr[] = $key." = ".$val;
- }
-
- return "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr)." WHERE ".implode(" ", $where);
- }
-
- // --------------------------------------------------------------------
- /**
- * Delete statement
- *
- * Generates a platform-specific delete string from the supplied data
- *
- * @access public
- * @param string the table name
- * @param array the where clause
- * @return string
- */
- function _delete($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)
- {
- @mssql_close($conn_id);
- }
- }
- ?>