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<?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 3.0.0
* @filesource
*/
/**
* PDO 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_pdo_mysql_driver extends CI_DB_pdo_driver {
public $subdriver = 'mysql';
public $compress = FALSE;
protected $_escape_char = '`';
protected $_random_keyword = ' RAND()';
/**
* Constructor
*
* Builds the DSN if not already set.
*
* @param array
* @return void
*/
public function __construct($params)
{
parent::__construct($params);
if (empty($this->dsn))
{
$this->dsn = 'mysql:host='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname);
empty($this->port) OR $this->dsn .= ';port='.$this->port;
empty($this->database) OR $this->dsn .= ';dbname='.$this->database;
empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set;
}
elseif ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 6) === FALSE && is_php('5.3.6'))
{
$this->dsn .= ';charset='.$this->char_set;
}
}
// --------------------------------------------------------------------
/**
* Non-persistent database connection
*
* @param bool
* @return object
* @todo SSL support
*/
public function db_connect($persistent = FALSE)
{
/* Prior to PHP 5.3.6, even if the charset was supplied in the DSN
* on connect - it was ignored. This is a work-around for the issue.
*
* Reference: http://www.php.net/manual/en/ref.pdo-mysql.connection.php
*/
if ( ! is_php('5.3.6') && ! empty($this->char_set))
{
$this->options[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET NAMES '.$this->char_set
.(empty($this->dbcollat) ? '' : ' COLLATE '.$this->dbcollat);
}
if ($this->compress === TRUE)
{
$this->options[PDO::MYSQL_ATTR_COMPRESS] = TRUE;
}
return parent::db_connect($persistent);
}
// --------------------------------------------------------------------
/**
* Show 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)
{
$sql = 'SHOW TABLES';
if ($prefix_limit === TRUE && $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);
}
// --------------------------------------------------------------------
/**
* Field data query
*
* Generates a platform-specific query so that the column data can be retrieved
*
* @param string the table name
* @return string
*/
protected function _field_data($table)
{
return 'SELECT * FROM '.$this->protect_identifiers($table).' LIMIT 1';
}
// --------------------------------------------------------------------
/**
* Update_Batch statement
*
* Generates a platform-specific batch update string from the supplied data
*
* @param string the table name
* @param array the update data
* @param string the where key
* @return string
*/
protected function _update_batch($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');
}
// --------------------------------------------------------------------
/**
* Truncate statement
*
* Generates a platform-specific truncate string from the supplied data
*
* If the database does not support the truncate() command,
* then this method maps to 'DELETE FROM table'
*
* @param string the table name
* @return string
*/
protected function _truncate($table)
{
return 'TRUNCATE '.$table;
}
// --------------------------------------------------------------------
/**
* 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);
}
}
/* End of file pdo_mysql_driver.php */
/* Location: ./system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php */
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