<?php /** * CodeIgniter * * An open source application development framework for PHP 5.2.4 or newer * * NOTICE OF LICENSE * * Licensed under the Open Software License version 3.0 * * This source file is subject to the Open Software License (OSL 3.0) that is * bundled with this package in the files license.txt / license.rst. It is * also available through the world wide web at this URL: * http://opensource.org/licenses/OSL-3.0 * If you did not receive a copy of the license and are unable to obtain it * through the world wide web, please send an email to * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @link http://codeigniter.com * @since Version 1.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * MySQL Database Adapter Class * * Note: _DB is an extender class that the app controller * creates dynamically based on whether the query builder * class is being used or not. * * @package CodeIgniter * @subpackage Drivers * @category Database * @author EllisLab Dev Team * @link http://codeigniter.com/user_guide/database/ */ class CI_DB_mysql_driver extends CI_DB { /** * Database driver * * @var string */ public $dbdriver = 'mysql'; /** * Compression flag * * @var bool */ public $compress = FALSE; /** * DELETE hack flag * * Whether to use the MySQL "delete hack" which allows the number * of affected rows to be shown. Uses a preg_replace when enabled, * adding a bit more processing to all queries. * * @var bool */ public $delete_hack = TRUE; // -------------------------------------------------------------------- /** * Identifier escape character * * @var string */ protected $_escape_char = '`'; // -------------------------------------------------------------------- /** * Class constructor * * @param array $params * @return void */ public function __construct($params) { parent::__construct($params); if ( ! empty($this->port)) { $this->hostname .= ':'.$this->port; } } // -------------------------------------------------------------------- /** * Non-persistent database connection * * @param bool $persistent * @return resource */ public function db_connect($persistent = FALSE) { $client_flags = ($this->compress === FALSE) ? 0 : MYSQL_CLIENT_COMPRESS; if ($this->encrypt === TRUE) { $client_flags = $client_flags | MYSQL_CLIENT_SSL; } return ($persistent === TRUE) ? @mysql_pconnect($this->hostname, $this->username, $this->password, $client_flags) : @mysql_connect($this->hostname, $this->username, $this->password, TRUE, $client_flags); } // -------------------------------------------------------------------- /** * Persistent database connection * * @return resource */ public function db_pconnect() { return $this->db_connect(TRUE); } // -------------------------------------------------------------------- /** * Reconnect * * Keep / reestablish the db connection if no queries have been * sent for a length of time exceeding the server's idle timeout * * @return void */ public function reconnect() { if (mysql_ping($this->conn_id) === FALSE) { $this->conn_id = FALSE; } } // -------------------------------------------------------------------- /** * Select the database * * @param string $database * @return bool */ public function db_select($database = '') { if ($database === '') { $database = $this->database; } if (@mysql_select_db($database, $this->conn_id)) { $this->database = $database; return TRUE; } return FALSE; } // -------------------------------------------------------------------- /** * Set client character set * * @param string $charset * @return bool */ protected function _db_set_charset($charset) { return @mysql_set_charset($charset, $this->conn_id); } // -------------------------------------------------------------------- /** * Database version number * * @return string */ public function version() { if (isset($this->data_cache['version'])) { return $this->data_cache['version']; } elseif ( ! $this->conn_id) { $this->initialize(); } if ( ! $this->conn_id OR ($version = @mysql_get_server_info($this->conn_id)) === FALSE) { return FALSE; } return $this->data_cache['version'] = $version; } // -------------------------------------------------------------------- /** * Execute the query * * @param string $sql an SQL query * @return mixed */ protected function _execute($sql) { return @mysql_query($this->_prep_query($sql), $this->conn_id); } // -------------------------------------------------------------------- /** * Prep the query * * If needed, each database adapter can prep the query string * * @param string $sql an SQL query * @return string */ protected function _prep_query($sql) { // mysql_affected_rows() returns 0 for "DELETE FROM TABLE" queries. This hack // modifies the query so that it a proper number of affected rows is returned. if ($this->delete_hack === TRUE && preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $sql)) { return preg_replace('/^\s*DELETE\s+FROM\s+(\S+)\s*$/', 'DELETE FROM \\1 WHERE 1=1', $sql); } return $sql; } // -------------------------------------------------------------------- /** * Begin Transaction * * @param bool $test_mode * @return bool */ public function trans_begin($test_mode = FALSE) { // When transactions are nested we only begin/commit/rollback the outermost ones if ( ! $this->trans_enabled OR $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); $this->simple_query('SET AUTOCOMMIT=0'); $this->simple_query('START TRANSACTION'); // can also be BEGIN or BEGIN WORK return TRUE; } // -------------------------------------------------------------------- /** * Commit Transaction * * @return bool */ public function trans_commit() { // When transactions are nested we only begin/commit/rollback the outermost ones if ( ! $this->trans_enabled OR $this->_trans_depth > 0) { return TRUE; } $this->simple_query('COMMIT'); $this->simple_query('SET AUTOCOMMIT=1'); return TRUE; } // -------------------------------------------------------------------- /** * Rollback Transaction * * @return bool */ public function trans_rollback() { // When transactions are nested we only begin/commit/rollback the outermost ones if ( ! $this->trans_enabled OR $this->_trans_depth > 0) { return TRUE; } $this->simple_query('ROLLBACK'); $this->simple_query('SET AUTOCOMMIT=1'); return TRUE; } // -------------------------------------------------------------------- /** * Escape String * * @param string $str * @param bool $like Whether or not the string will be used in a LIKE condition * @return string */ public function escape_str($str, $like = FALSE) { if (is_array($str)) { foreach ($str as $key => $val) { $str[$key] = $this->escape_str($val, $like); } return $str; } $str = is_resource($this->conn_id) ? mysql_real_escape_string($str, $this->conn_id) : addslashes($str); // escape LIKE condition wildcards if ($like === TRUE) { return str_replace(array($this->_like_escape_chr, '%', '_'), array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'), $str); } return $str; } // -------------------------------------------------------------------- /** * Affected Rows * * @return int */ public function affected_rows() { return @mysql_affected_rows($this->conn_id); } // -------------------------------------------------------------------- /** * Insert ID * * @return int */ public function insert_id() { return @mysql_insert_id($this->conn_id); } // -------------------------------------------------------------------- /** * List table query * * Generates a platform-specific query string so that the table names can be fetched * * @param bool $prefix_limit * @return string */ protected function _list_tables($prefix_limit = FALSE) { $sql = 'SHOW TABLES FROM '.$this->escape_identifiers($this->database); if ($prefix_limit !== FALSE && $this->dbprefix !== '') { return $sql." LIKE '".$this->escape_like_str($this->dbprefix)."%'"; } return $sql; } // -------------------------------------------------------------------- /** * Show column query * * Generates a platform-specific query string so that the column names can be fetched * * @param string $table * @return string */ protected function _list_columns($table = '') { return 'SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE); } // -------------------------------------------------------------------- /** * Returns an object with field data * * @param string $table * @return array */ public function field_data($table = '') { if ($table === '') { return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE; } if (($query = $this->query('SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE))) === FALSE) { return FALSE; } $query = $query->result_object(); $retval = array(); for ($i = 0, $c = count($query); $i < $c; $i++) { $retval[$i] = new stdClass(); $retval[$i]->name = $query[$i]->Field; sscanf($query[$i]->Type, '%[a-z](%d)', $retval[$i]->type, $retval[$i]->max_length ); $retval[$i]->default = $query[$i]->Default; $retval[$i]->primary_key = (int) ($query[$i]->Key === 'PRI'); } return $retval; } // -------------------------------------------------------------------- /** * Error * * Returns an array containing code and message of the last * database error that has occured. * * @return array */ public function error() { return array('code' => mysql_errno($this->conn_id), 'message' => mysql_error($this->conn_id)); } // -------------------------------------------------------------------- /** * Update_Batch statement * * Generates a platform-specific batch update string from the supplied data * * @param string $table Table name * @param array $values Update data * @param string $index WHERE key * @return string */ protected function _update_batch($table, $values, $index) { $ids = array(); foreach ($values as $key => $val) { $ids[] = $val[$index]; foreach (array_keys($val) as $field) { if ($field !== $index) { $final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field]; } } } $cases = ''; foreach ($final as $k => $v) { $cases .= $k." = CASE \n" .implode("\n", $v)."\n" .'ELSE '.$k.' END, '; } $this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE); return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where'); } // -------------------------------------------------------------------- /** * FROM tables * * Groups tables in FROM clauses if needed, so there is no confusion * about operator precedence. * * @return string */ protected function _from_tables() { if ( ! empty($this->qb_join) && count($this->qb_from) > 1) { return '('.implode(', ', $this->qb_from).')'; } return implode(', ', $this->qb_from); } // -------------------------------------------------------------------- /** * Close DB Connection * * @return void */ protected function _close() { @mysql_close($this->conn_id); } } /* End of file mysql_driver.php */ /* Location: ./system/database/drivers/mysql/mysql_driver.php */