494 lines
11 KiB
PHP
494 lines
11 KiB
PHP
<?php
|
|
/**
|
|
* CodeIgniter
|
|
*
|
|
* An open source application development framework for PHP
|
|
*
|
|
* This content is released under the MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2014 - 2016, British Columbia Institute of Technology
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*
|
|
* @package CodeIgniter
|
|
* @author EllisLab Dev Team
|
|
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
|
|
* @copyright Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)
|
|
* @license http://opensource.org/licenses/MIT MIT License
|
|
* @link https://codeigniter.com
|
|
* @since Version 1.0.0
|
|
* @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 https://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;
|
|
|
|
/**
|
|
* Strict ON flag
|
|
*
|
|
* Whether we're running in strict SQL mode.
|
|
*
|
|
* @var bool
|
|
*/
|
|
public $stricton;
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
// Error suppression is necessary mostly due to PHP 5.5+ issuing E_DEPRECATED messages
|
|
$this->conn_id = ($persistent === TRUE)
|
|
? mysql_pconnect($this->hostname, $this->username, $this->password, $client_flags)
|
|
: mysql_connect($this->hostname, $this->username, $this->password, TRUE, $client_flags);
|
|
|
|
// ----------------------------------------------------------------
|
|
|
|
// Select the DB... assuming a database name is specified in the config file
|
|
if ($this->database !== '' && ! $this->db_select())
|
|
{
|
|
log_message('error', 'Unable to select database: '.$this->database);
|
|
|
|
return ($this->db_debug === TRUE)
|
|
? $this->display_error('db_unable_to_select', $this->database)
|
|
: FALSE;
|
|
}
|
|
|
|
if (isset($this->stricton) && is_resource($this->conn_id))
|
|
{
|
|
if ($this->stricton)
|
|
{
|
|
$this->simple_query('SET SESSION sql_mode = CONCAT(@@sql_mode, ",", "STRICT_ALL_TABLES")');
|
|
}
|
|
else
|
|
{
|
|
$this->simple_query(
|
|
'SET SESSION sql_mode =
|
|
REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(
|
|
@@sql_mode,
|
|
"STRICT_ALL_TABLES,", ""),
|
|
",STRICT_ALL_TABLES", ""),
|
|
"STRICT_ALL_TABLES", ""),
|
|
"STRICT_TRANS_TABLES,", ""),
|
|
",STRICT_TRANS_TABLES", ""),
|
|
"STRICT_TRANS_TABLES", "")'
|
|
);
|
|
}
|
|
}
|
|
|
|
return $this->conn_id;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Reconnect
|
|
*
|
|
* Keep / reestablish the db connection if no queries have been
|
|
* sent for a length of time exceeding the server's idle timeout
|
|
*
|
|
* @return void
|
|
*/
|
|
public function reconnect()
|
|
{
|
|
if (mysql_ping($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'];
|
|
}
|
|
|
|
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', $sql))
|
|
{
|
|
return trim($sql).' WHERE 1=1';
|
|
}
|
|
|
|
return $sql;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Begin Transaction
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function _trans_begin()
|
|
{
|
|
$this->simple_query('SET AUTOCOMMIT=0');
|
|
return $this->simple_query('START TRANSACTION'); // can also be BEGIN or BEGIN WORK
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Commit Transaction
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function _trans_commit()
|
|
{
|
|
if ($this->simple_query('COMMIT'))
|
|
{
|
|
$this->simple_query('SET AUTOCOMMIT=1');
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Rollback Transaction
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function _trans_rollback()
|
|
{
|
|
if ($this->simple_query('ROLLBACK'))
|
|
{
|
|
$this->simple_query('SET AUTOCOMMIT=1');
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Platform-dependant string escape
|
|
*
|
|
* @param string
|
|
* @return string
|
|
*/
|
|
protected function _escape_str($str)
|
|
{
|
|
return mysql_real_escape_string($str, $this->conn_id);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Affected Rows
|
|
*
|
|
* @return int
|
|
*/
|
|
public function affected_rows()
|
|
{
|
|
return mysql_affected_rows($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 (($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($this->conn_id));
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* FROM tables
|
|
*
|
|
* Groups tables in FROM clauses if needed, so there is no confusion
|
|
* about operator precedence.
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function _from_tables()
|
|
{
|
|
if ( ! empty($this->qb_join) && count($this->qb_from) > 1)
|
|
{
|
|
return '('.implode(', ', $this->qb_from).')';
|
|
}
|
|
|
|
return implode(', ', $this->qb_from);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Close DB Connection
|
|
*
|
|
* @return void
|
|
*/
|
|
protected function _close()
|
|
{
|
|
// Error suppression to avoid annoying E_WARNINGs in cases
|
|
// where the connection has already been closed for some reason.
|
|
@mysql_close($this->conn_id);
|
|
}
|
|
|
|
}
|