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<?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 2.1.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * CUBRID 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		Esen Sagynov

 * @link		https://codeigniter.com/user_guide/database/

 */

class CI_DB_cubrid_driver extends CI_DB {

	/**

	 * Database driver

	 *

	 * @var	string

	 */

	public $dbdriver = 'cubrid';

	/**

	 * Auto-commit flag

	 *

	 * @var	bool

	 */

	public $auto_commit = TRUE;

	// --------------------------------------------------------------------

	/**

	 * Identifier escape character

	 *

	 * @var	string

	 */

	protected $_escape_char = '`';

	/**

	 * ORDER BY random keyword

	 *

	 * @var	array

	 */

	protected $_random_keyword = array('RANDOM()', 'RANDOM(%d)');

	// --------------------------------------------------------------------

	/**

	 * Class constructor

	 *

	 * @param	array	$params

	 * @return	void

	 */

	public function __construct($params)

	{

		parent::__construct($params);

		if (preg_match('/^CUBRID:[^:]+(:[0-9][1-9]{0,4})?:[^:]+:[^:]*:[^:]*:(\?.+)?$/', $this->dsn, $matches))

		{

			if (stripos($matches[2], 'autocommit=off') !== FALSE)

			{

				$this->auto_commit = FALSE;

			}

		}

		else

		{

			// If no port is defined by the user, use the default value

			empty($this->port) OR $this->port = 33000;

		}

	}

	// --------------------------------------------------------------------

	/**

	 * Non-persistent database connection

	 *

	 * @param	bool	$persistent

	 * @return	resource

	 */

	public function db_connect($persistent = FALSE)

	{

		if (preg_match('/^CUBRID:[^:]+(:[0-9][1-9]{0,4})?:[^:]+:([^:]*):([^:]*):(\?.+)?$/', $this->dsn, $matches))

		{

			$func = ($persistent !== TRUE) ? 'cubrid_connect_with_url' : 'cubrid_pconnect_with_url';

			return ($matches[2] === '' && $matches[3] === '' && $this->username !== '' && $this->password !== '')

				? $func($this->dsn, $this->username, $this->password)

				: $func($this->dsn);

		}

		$func = ($persistent !== TRUE) ? 'cubrid_connect' : 'cubrid_pconnect';

		return ($this->username !== '')

			? $func($this->hostname, $this->port, $this->database, $this->username, $this->password)

			: $func($this->hostname, $this->port, $this->database);

	}

	// --------------------------------------------------------------------

	/**

	 * 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 (cubrid_ping($this->conn_id) === FALSE)

		{

			$this->conn_id = FALSE;

		}

	}

	// --------------------------------------------------------------------

	/**

	 * Database version number

	 *

	 * @return	string

	 */

	public function version()

	{

		if (isset($this->data_cache['version']))

		{

			return $this->data_cache['version'];

		}

		return ( ! $this->conn_id OR ($version = cubrid_get_server_info($this->conn_id)) === FALSE)

			? FALSE

			: $this->data_cache['version'] = $version;

	}

	// --------------------------------------------------------------------

	/**

	 * Execute the query

	 *

	 * @param	string	$sql	an SQL query

	 * @return	resource

	 */

	protected function _execute($sql)

	{

		return cubrid_query($sql, $this->conn_id);

	}

	// --------------------------------------------------------------------

	/**

	 * Begin Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_begin()

	{

		if (($autocommit = cubrid_get_autocommit($this->conn_id)) === NULL)

		{

			return FALSE;

		}

		elseif ($autocommit === TRUE)

		{

			return cubrid_set_autocommit($this->conn_id, CUBRID_AUTOCOMMIT_FALSE);

		}

		return TRUE;

	}

	// --------------------------------------------------------------------

	/**

	 * Commit Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_commit()

	{

		if ( ! cubrid_commit($this->conn_id))

		{

			return FALSE;

		}

		if ($this->auto_commit && ! cubrid_get_autocommit($this->conn_id))

		{

			return cubrid_set_autocommit($this->conn_id, CUBRID_AUTOCOMMIT_TRUE);

		}

		return TRUE;

	}

	// --------------------------------------------------------------------

	/**

	 * Rollback Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_rollback()

	{

		if ( ! cubrid_rollback($this->conn_id))

		{

			return FALSE;

		}

		if ($this->auto_commit && ! cubrid_get_autocommit($this->conn_id))

		{

			cubrid_set_autocommit($this->conn_id, CUBRID_AUTOCOMMIT_TRUE);

		}

		return TRUE;

	}

	// --------------------------------------------------------------------

	/**

	 * Platform-dependant string escape

	 *

	 * @param	string

	 * @return	string

	 */

	protected function _escape_str($str)

	{

		return cubrid_real_escape_string($str, $this->conn_id);

	}

	// --------------------------------------------------------------------

	/**

	 * Affected Rows

	 *

	 * @return	int

	 */

	public function affected_rows()

	{

		return cubrid_affected_rows();

	}

	// --------------------------------------------------------------------

	/**

	 * Insert ID

	 *

	 * @return	int

	 */

	public function insert_id()

	{

		return cubrid_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';

		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' => cubrid_errno($this->conn_id), 'message' => cubrid_error($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()

	{

		cubrid_close($this->conn_id);

	}

}