<?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 */ /** * MySQL 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 EllisLab Dev Team * @link http://codeigniter.com/user_guide/database/ */ class CI_DB_mysql_driver extends CI_DB { public $dbdriver = 'mysql'; // 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 $delete_hack = TRUE; public function __construct($params) { parent::__construct($params); if ($this->port != '') { $this->hostname .= ':'.$this->port; } } /** * Non-persistent database connection * * @return resource */ public function db_connect() { return @mysql_connect($this->hostname, $this->username, $this->password, TRUE); } // -------------------------------------------------------------------- /** * Persistent database connection * * @return resource */ public function db_pconnect() { return @mysql_pconnect($this->hostname, $this->username, $this->password); } // -------------------------------------------------------------------- /** * Reconnect * * Keep / reestablish the db connection if no queries have been * sent for a length of time exceeding the server's idle timeout * * @return void */ public function reconnect() { if (mysql_ping($this->conn_id) === FALSE) { $this->conn_id = FALSE; } } // -------------------------------------------------------------------- /** * Select the database * * @param string database name * @return bool */ public function db_select($database = '') { if ($database === '') { $database = $this->database; } if (@mysql_select_db($database, $this->conn_id)) { $this->database = $database; return TRUE; } return FALSE; } // -------------------------------------------------------------------- /** * Set client character set * * @param string * @return bool */ protected function _db_set_charset($charset) { return @mysql_set_charset($charset, $this->conn_id); } // -------------------------------------------------------------------- /** * Database version number * * @return string */ public function version() { return isset($this->data_cache['version']) ? $this->data_cache['version'] : $this->data_cache['version'] = @mysql_get_server_info($this->conn_id); } // -------------------------------------------------------------------- /** * Execute the query * * @param string an SQL query * @return mixed */ protected function _execute($sql) { return @mysql_query($this->_prep_query($sql), $this->conn_id); } // -------------------------------------------------------------------- /** * Prep the query * * If needed, each database adapter can prep the query string * * @param string an SQL query * @return string */ protected function _prep_query($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 $sql; } // -------------------------------------------------------------------- /** * Begin Transaction * * @return bool */ public function trans_begin($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; } $str = is_resource($this->conn_id) ? mysql_real_escape_string($str, $this->conn_id) : addslashes($str); // escape LIKE condition wildcards if ($like === TRUE) { return str_replace(array('%', '_'), array('\\%', '\\_'), $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($this->conn_id); } // -------------------------------------------------------------------- /** * "Count All" query * * Generates a platform-specific query string that counts all records in * the specified database * * @param string * @return string */ public function count_all($table = '') { if ($table == '') { return 0; } $query = $this->query($this->_count_string.$this->protect_identifiers('numrows').' FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE)); if ($query->num_rows() == 0) { return 0; } $query = $query->row(); $this->_reset_select(); return (int) $query->numrows; } // -------------------------------------------------------------------- /** * List table query * * Generates a platform-specific query string so that the table names can be fetched * * @param bool * @return string */ protected function _list_tables($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 $sql; } // -------------------------------------------------------------------- /** * Show column query * * Generates a platform-specific query string so that the column names can be fetched * * @param string the table name * @return string */ public function _list_columns($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 $retval; } // -------------------------------------------------------------------- /** * Error * * Returns an array containing code and message of the last * database error that has occured. * * @return array */ public function error() { return array('code' => mysql_errno($this->conn_id), 'message' => mysql_error($this->conn_id)); } // -------------------------------------------------------------------- /** * Escape the SQL Identifiers * * This function escapes column and table names * * @param string * @return string */ public function _escape_identifiers($item) { if ($this->_escape_char == '') { return $item; } foreach ($this->_reserved_identifiers as $id) { if (strpos($item, '.'.$id) !== FALSE) { $item = str_replace('.', $this->_escape_char.'.', $item); // remove duplicates if the user already included the escape return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $this->_escape_char.$item); } } if (strpos($item, '.') !== FALSE) { $item = str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item); } // remove duplicates if the user already included the escape return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $this->_escape_char.$item.$this->_escape_char); } // -------------------------------------------------------------------- /** * From Tables * * This function implicitly groups FROM tables so there is no confusion * about operator precedence in harmony with SQL standards * * @param string table name * @return string */ protected function _from_tables($tables) { if ( ! is_array($tables)) { $tables = array($tables); } return '('.implode(', ', $tables).')'; } // -------------------------------------------------------------------- /** * Insert statement * * Generates a platform-specific insert string from the supplied data * * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ protected function _insert($table, $keys, $values) { return 'INSERT INTO '.$table.' ('.implode(', ', $keys).') VALUES ('.implode(', ', $values).')'; } // -------------------------------------------------------------------- /** * Replace statement * * Generates a platform-specific replace string from the supplied data * * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ protected function _replace($table, $keys, $values) { return 'REPLACE INTO '.$table.' ('.implode(', ', $keys).') VALUES ('.implode(', ', $values).')'; } // -------------------------------------------------------------------- /** * Insert_batch statement * * Generates a platform-specific insert string from the supplied data * * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ protected function _insert_batch($table, $keys, $values) { return 'INSERT INTO '.$table.' ('.implode(', ', $keys).') VALUES '.implode(', ', $values); } // -------------------------------------------------------------------- /** * Update statement * * Generates a platform-specific update string from the supplied data * * @param string the table name * @param array the update data * @param array the where clause * @param array the orderby clause * @param array the limit clause * @return string */ protected function _update($table, $values, $where, $orderby = array(), $limit = FALSE, $like = array()) { foreach ($values as $key => $val) { $valstr[] = $key.' = '.$val; } $where = ($where != '' && count($where) > 0) ? ' WHERE '.implode(' ', $where) : ''; if (count($like) > 0) { $where .= ($where == '' ? ' WHERE ' : ' AND ').implode(' ', $like); } return 'UPDATE '.$table.' SET '.implode(', ', $valstr).$where .(count($orderby) > 0 ? ' ORDER BY '.implode(', ', $orderby) : '') .( ! $limit ? '' : ' LIMIT '.$limit); } // -------------------------------------------------------------------- /** * 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, '; } return 'UPDATE '.$table.' SET '.substr($cases, 0, -2) .' WHERE '.(($where != '' && count($where) > 0) ? implode(' ', $where).' AND ' : '') .$index.' IN('.implode(',', $ids).')'; } // -------------------------------------------------------------------- /** * Truncate statement * * Generates a platform-specific truncate string from the supplied data * If the database does not support the truncate() command * This function maps to "DELETE FROM table" * * @param string the table name * @return string */ protected function _truncate($table) { return 'TRUNCATE '.$table; } // -------------------------------------------------------------------- /** * Delete statement * * Generates a platform-specific delete string from the supplied data * * @param string the table name * @param array the where clause * @param string the limit clause * @return string */ protected function _delete($table, $where = array(), $like = array(), $limit = FALSE) { $conditions = ''; if (count($where) > 0 OR count($like) > 0) { $conditions = "\nWHERE ".implode("\n", $this->ar_where); if (count($where) > 0 && count($like) > 0) { $conditions .= ' AND '; } $conditions .= implode("\n", $like); } return 'DELETE FROM '.$table.$conditions.( ! $limit ? '' : ' LIMIT '.$limit); } // -------------------------------------------------------------------- /** * 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 $sql.' LIMIT '.($offset == 0 ? '' : $offset.', ').$limit; } // -------------------------------------------------------------------- /** * Close DB Connection * * @param resource * @return void */ protected function _close($conn_id) { @mysql_close($conn_id); } } /* End of file mysql_driver.php */ /* Location: ./system/database/drivers/mysql/mysql_driver.php */