<?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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* MySQLi Database Adapter Class - MySQLi only works with PHP 5
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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_mysqli_driver extends CI_DB {
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var $dbdriver = 'mysqli';
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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 - not used in MySQL
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var $_like_escape_str = '';
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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 = ' RAND()'; // database specific random keyword
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/**
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* Whether to use the MySQL "delete hack" which allows the number
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* of affected rows to be shown. Uses a preg_replace when enabled,
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* adding a bit more processing to all queries.
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*/
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var $delete_hack = TRUE;
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// whether SET NAMES must be used to set the character set
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var $use_set_names;
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// --------------------------------------------------------------------
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/**
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* Non-persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_connect()
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{
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if ($this->port != '')
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{
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return @mysqli_connect($this->hostname, $this->username, $this->password, $this->database, $this->port);
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}
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else
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{
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return @mysqli_connect($this->hostname, $this->username, $this->password, $this->database);
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}
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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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return $this->db_connect();
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}
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// --------------------------------------------------------------------
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/**
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* Reconnect
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*
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* Keep / reestablish the db connection if no queries have been
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* sent for a length of time exceeding the server's idle timeout
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*
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* @access public
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* @return void
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*/
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function reconnect()
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{
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if (mysqli_ping($this->conn_id) === FALSE)
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{
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$this->conn_id = FALSE;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Select the database
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_select()
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{
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return @mysqli_select_db($this->conn_id, $this->database);
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}
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// --------------------------------------------------------------------
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/**
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* Set client character set
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*
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* @access private
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* @param string
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* @param string
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* @return resource
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*/
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function _db_set_charset($charset, $collation)
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{
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if ( ! isset($this->use_set_names))
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{
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// mysqli_set_charset() requires MySQL >= 5.0.7, use SET NAMES as fallback
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$this->use_set_names = (version_compare(mysqli_get_server_info($this->conn_id), '5.0.7', '>=')) ? FALSE : TRUE;
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}
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if ($this->use_set_names === TRUE)
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{
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return @mysqli_query($this->conn_id, "SET NAMES '".$this->escape_str($charset)."' COLLATE '".$this->escape_str($collation)."'");
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}
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else
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{
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return @mysqli_set_charset($this->conn_id, $charset);
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}
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}
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// --------------------------------------------------------------------
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/**
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* Version number query string
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*
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* @access public
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* @return string
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*/
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function _version()
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{
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return "SELECT version() AS ver";
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}
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// --------------------------------------------------------------------
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/**
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* Execute the query
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*
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* @access private called by the base class
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* @param string an SQL query
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* @return resource
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*/
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function _execute($sql)
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{
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$sql = $this->_prep_query($sql);
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$result = @mysqli_query($this->conn_id, $sql);
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return $result;
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}
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// --------------------------------------------------------------------
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/**
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* Prep the query
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*
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* If needed, each database adapter can prep the query string
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*
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* @access private called by execute()
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* @param string an SQL query
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* @return string
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*/
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function _prep_query($sql)
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{
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// "DELETE FROM TABLE" returns 0 affected rows This hack modifies
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// the query so that it returns the number of affected rows
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if ($this->delete_hack === TRUE)
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{
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if (preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $sql))
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{
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$sql = preg_replace("/^\s*DELETE\s+FROM\s+(\S+)\s*$/", "DELETE FROM \\1 WHERE 1=1", $sql);
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}
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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('SET AUTOCOMMIT=0');
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$this->simple_query('START TRANSACTION'); // can also be BEGIN or BEGIN WORK
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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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$this->simple_query('COMMIT');
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$this->simple_query('SET AUTOCOMMIT=1');
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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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$this->simple_query('ROLLBACK');
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$this->simple_query('SET AUTOCOMMIT=1');
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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 $str;
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}
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if (function_exists('mysqli_real_escape_string') AND is_object($this->conn_id))
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{
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$str = mysqli_real_escape_string($this->conn_id, $str);
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}
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elseif (function_exists('mysql_escape_string'))
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{
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$str = mysql_escape_string($str);
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}
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else
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{
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$str = addslashes($str);
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}
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// escape LIKE condition wildcards
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if ($like === TRUE)
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{
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$str = str_replace(array('%', '_'), array('\\%', '\\_'), $str);
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}
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return $str;
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @access public
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* @return integer
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*/
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function affected_rows()
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{
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return @mysqli_affected_rows($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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* @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 @mysqli_insert_id($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* "Count All" query
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*
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* Generates a platform-specific query string that counts all records in
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* the specified database
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*
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* @access public
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* @param string
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* @return string
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*/
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function count_all($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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$sql = "SHOW TABLES FROM ".$this->_escape_char.$this->database.$this->_escape_char;
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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)."%'";
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Show column query
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*
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* Generates a platform-specific query string so that the column names can be fetched
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*
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* @access public
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* @param string the table name
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* @return string
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*/
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function _list_columns($table = '')
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{
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return "SHOW COLUMNS FROM ".$this->_protect_identifiers($table, TRUE, NULL, FALSE);
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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($table)
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{
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return "DESCRIBE ".$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 mysqli_error($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* The error message number
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*
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* @access private
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* @return integer
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*/
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function _error_number()
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{
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return mysqli_errno($this->conn_id);
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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(', ', $values).")";
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}
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// --------------------------------------------------------------------
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/**
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* Insert_batch statement
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*
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* Generates a platform-specific insert string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the insert keys
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* @param array the insert values
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* @return string
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*/
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function _insert_batch($table, $keys, $values)
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{
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return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES ".implode(', ', $values);
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}
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// --------------------------------------------------------------------
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/**
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* Replace statement
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*
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* Generates a platform-specific replace string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the insert keys
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* @param array the insert values
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* @return string
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*/
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function _replace($table, $keys, $values)
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{
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return "REPLACE INTO ".$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 $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Update_Batch statement
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*
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* Generates a platform-specific batch update string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the update data
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* @param array the where clause
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* @return string
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*/
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function _update_batch($table, $values, $index, $where = NULL)
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{
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$ids = array();
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$where = ($where != '' AND count($where) >=1) ? implode(" ", $where).' AND ' : '';
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foreach ($values as $key => $val)
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{
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$ids[] = $val[$index];
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foreach (array_keys($val) as $field)
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{
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if ($field != $index)
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{
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$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
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}
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}
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}
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$sql = "UPDATE ".$table." SET ";
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$cases = '';
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foreach ($final as $k => $v)
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{
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$cases .= $k.' = CASE '."\n";
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foreach ($v as $row)
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{
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$cases .= $row."\n";
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}
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$cases .= 'ELSE '.$k.' END, ';
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}
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$sql .= substr($cases, 0, -2);
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$sql .= ' WHERE '.$where.$index.' IN ('.implode(',', $ids).')';
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return $sql;
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}
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|
// --------------------------------------------------------------------
|
|
/**
|
* Truncate statement
|
*
|
* Generates a platform-specific truncate string from the supplied data
|
* If the database does not support the truncate() command
|
* This function maps to "DELETE FROM table"
|
*
|
* @access public
|
* @param string the table name
|
* @return string
|
*/
|
function _truncate($table)
|
{
|
return "TRUNCATE ".$table;
|
}
|
|
// --------------------------------------------------------------------
|
|
/**
|
* Delete statement
|
*
|
* Generates a platform-specific delete string from the supplied data
|
*
|
* @access public
|
* @param string the table name
|
* @param array the where clause
|
* @param string the limit clause
|
* @return string
|
*/
|
function _delete($table, $where = array(), $like = array(), $limit = FALSE)
|
{
|
$conditions = '';
|
|
if (count($where) > 0 OR count($like) > 0)
|
{
|
$conditions = "\nWHERE ";
|
$conditions .= implode("\n", $this->ar_where);
|
|
if (count($where) > 0 && count($like) > 0)
|
{
|
$conditions .= " AND ";
|
}
|
$conditions .= implode("\n", $like);
|
}
|
|
$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
|
|
return "DELETE FROM ".$table.$conditions.$limit;
|
}
|
|
// --------------------------------------------------------------------
|
|
/**
|
* Limit string
|
*
|
* Generates a platform-specific LIMIT clause
|
*
|
* @access public
|
* @param string the sql query string
|
* @param integer the number of rows to limit the query to
|
* @param integer the offset value
|
* @return string
|
*/
|
function _limit($sql, $limit, $offset)
|
{
|
$sql .= "LIMIT ".$limit;
|
|
if ($offset > 0)
|
{
|
$sql .= " OFFSET ".$offset;
|
}
|
|
return $sql;
|
}
|
|
// --------------------------------------------------------------------
|
|
/**
|
* Close DB Connection
|
*
|
* @access public
|
* @param resource
|
* @return void
|
*/
|
function _close($conn_id)
|
{
|
@mysqli_close($conn_id);
|
}
|
|
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}
|
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/* End of file mysqli_driver.php */
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/* Location: ./system/database/drivers/mysqli/mysqli_driver.php */
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