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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 3.0.0

 * @filesource

 */

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

/**

 * PDO 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		EllisLab Dev Team

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

 */

class CI_DB_pdo_cubrid_driver extends CI_DB_pdo_driver {

	/**

	 * Sub-driver

	 *

	 * @var	string

	 */

	public $subdriver = 'cubrid';

	/**

	 * Identifier escape character

	 *

	 * @var	string

	 */

	protected $_escape_char = '`';

	/**

	 * ORDER BY random keyword

	 *

	 * @var array

	 */

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

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

	/**

	 * Class constructor

	 *

	 * Builds the DSN if not already set.

	 *

	 * @param	array	$params

	 * @return	void

	 */

	public function __construct($params)

	{

		parent::__construct($params);

		if (empty($this->dsn))

		{

			$this->dsn = 'cubrid:host='.(empty($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;

		}

	}

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

	/**

	 * Show 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 === 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	$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;

	}

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

	/**

	 * Update_Batch statement

	 *

	 * Generates a platform-specific batch update string from the supplied data

	 *

	 * @param	string	$table	Table name

	 * @param	array	$values	Update data

	 * @param	string	$index	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 statement,

	 * then this method maps to 'DELETE FROM table'

	 *

	 * @param	string	$table

	 * @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);

	}

}