<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * 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 */ /** * MySQLi 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_mysqli_driver extends CI_DB { public $dbdriver = 'mysqli'; // The character used for escaping protected $_escape_char = '`'; // clause and character used for LIKE escape sequences - not used in MySQL protected $_like_escape_str = ''; protected $_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. */ protected $_count_string = 'SELECT COUNT(*) AS '; protected $_random_keyword = ' RAND()'; // database specific random keyword /** * 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. */ public $delete_hack = TRUE; /** * Non-persistent database connection * * @return object */ public function db_connect() { return empty($this->port) ? @new mysqli($this->hostname, $this->username, $this->password, $this->database) : @new mysqli($this->hostname, $this->username, $this->password, $this->database, $this->port); } // -------------------------------------------------------------------- /** * Persistent database connection * * @return object */ public function db_pconnect() { // Persistent connection support was added in PHP 5.3.0 if ( ! is_php('5.3')) { return $this->db_connect(); } return empty($this->port) ? @new mysqli('p:'.$this->hostname, $this->username, $this->password, $this->database) : @new mysqli('p:'.$this->hostname, $this->username, $this->password, $this->database, $this->port); } // -------------------------------------------------------------------- /** * Reconnect * * Keep / reestablish the db connection if no queries have been * sent for a length of time exceeding the server's idle timeout * * @return void */ public function reconnect() { if ($this->conn_id !== FALSE && $this->conn_id->ping() === FALSE) { $this->conn_id = FALSE; } } // -------------------------------------------------------------------- /** * Select the database * * @param string database name * @return bool */ public function db_select($database = '') { if ($database === '') { $database = $this->database; } if (@$this->conn_id->select_db($database)) { $this->database = $database; return TRUE; } return FALSE; } // -------------------------------------------------------------------- /** * Set client character set * * @param string * @return bool */ protected function _db_set_charset($charset) { return @$this->conn_id->set_charset($charset); } // -------------------------------------------------------------------- /** * Database version number * * @return string */ public function version() { return isset($this->data_cache['version']) ? $this->data_cache['version'] : $this->data_cache['version'] = $this->conn_id->server_info; } // -------------------------------------------------------------------- /** * Execute the query * * @param string an SQL query * @return mixed */ protected function _execute($sql) { return @$this->conn_id->query($this->_prep_query($sql)); } // -------------------------------------------------------------------- /** * Prep the query * * If needed, each database adapter can prep the query string * * @param string an SQL query * @return string */ protected function _prep_query($sql) { // mysqli_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 $sql; } // -------------------------------------------------------------------- /** * Begin Transaction * * @return bool */ public function trans_begin($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'); $this->simple_query('SET AUTOCOMMIT=1'); return TRUE; } // -------------------------------------------------------------------- /** * Escape String * * @param string * @param bool whether or not the string will be used in a LIKE condition * @return string */ public function escape_str($str, $like = FALSE) { if (is_array($str)) { foreach ($str as $key => $val) { $str[$key] = $this->escape_str($val, $like); } return $str; } $str = is_object($this->conn_id) ? $this->conn_id->real_escape_string($str) : 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 $this->conn_id->affected_rows; } // -------------------------------------------------------------------- /** * Insert ID * * @return int */ public function insert_id() { return $this->conn_id->insert_id; } // -------------------------------------------------------------------- /** * List table query * * Generates a platform-specific query string so that the table names can be fetched * * @param bool * @return string */ protected function _list_tables($prefix_limit = FALSE) { $sql = 'SHOW TABLES FROM '.$this->_escape_char.$this->database.$this->_escape_char; if ($prefix_limit !== FALSE && $this->dbprefix !== '') { return $sql." LIKE '".$this->escape_like_str($this->dbprefix)."%'"; } return $sql; } // -------------------------------------------------------------------- /** * Show column query * * Generates a platform-specific query string so that the column names can be fetched * * @param string the table name * @return string */ protected function _list_columns($table = '') { return 'SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE); } // -------------------------------------------------------------------- /** * Returns an object with field data * * @param string the table name * @return object */ public function field_data($table = '') { if ($table === '') { return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE; } $query = $this->query('DESCRIBE '.$this->protect_identifiers($table, TRUE, NULL, FALSE)); $query = $query->result_object(); $retval = array(); for ($i = 0, $c = count($query); $i < $c; $i++) { preg_match('/([a-z]+)(\(\d+\))?/', $query[$i]->Type, $matches); $retval[$i] = new stdClass(); $retval[$i]->name = $query[$i]->Field; $retval[$i]->type = empty($matches[1]) ? NULL : $matches[1]; $retval[$i]->default = $query[$i]->Default; $retval[$i]->max_length = empty($matches[2]) ? NULL : preg_replace('/[^\d]/', '', $matches[2]); $retval[$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' => $this->conn_id->errno, 'message' => $this->conn_id->error); } // -------------------------------------------------------------------- /** * Update_Batch statement * * Generates a platform-specific batch update string from the supplied data * * @param string the table name * @param array the update data * @param array the where clause * @return string */ protected function _update_batch($table, $values, $index, $where = NULL) { $ids = array(); foreach ($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, '; } $where = ($where !== '' && count($where) > 0) ? implode(' ', $where).' AND ' : ''; return 'UPDATE '.$table.' SET '.substr($cases, 0, -2) .' WHERE '.(($where !== '' && count($where) > 0) ? implode(' ', $where).' AND ' : '') .$index.' IN('.implode(',', $ids).')'; } // -------------------------------------------------------------------- /** * Limit string * * Generates a platform-specific LIMIT clause * * @param string the sql query string * @param int the number of rows to limit the query to * @param int the offset value * @return string */ protected function _limit($sql, $limit, $offset) { return $sql.' LIMIT '.$limit .($offset > 0 ? ' OFFSET '.$offset : ''); } // -------------------------------------------------------------------- /** * Close DB Connection * * @return void */ protected function _close() { $this->conn_id->close(); } } /* End of file mysqli_driver.php */ /* Location: ./system/database/drivers/mysqli/mysqli_driver.php */