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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 - 2018, 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 - 2018, 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 ODBC 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_odbc_driver extends CI_DB_pdo_driver {

	/**

	 * Sub-driver

	 *

	 * @var	string

	 */

	public $subdriver = 'odbc';

	/**

	 * Database schema

	 *

	 * @var	string

	 */

	public $schema = 'public';

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

	/**

	 * Identifier escape character

	 *

	 * Must be empty for ODBC.

	 *

	 * @var	string

	 */

	protected $_escape_char = '';

	/**

	 * ESCAPE statement string

	 *

	 * @var	string

	 */

	protected $_like_escape_str = " {escape '%s'} ";

	/**

	 * ORDER BY random keyword

	 *

	 * @var	array

	 */

	protected $_random_keyword = array('RND()', 'RND(%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 = 'odbc:';

			// Pre-defined DSN

			if (empty($this->hostname) && empty($this->HOSTNAME) && empty($this->port) && empty($this->PORT))

			{

				if (isset($this->DSN))

				{

					$this->dsn .= 'DSN='.$this->DSN;

				}

				elseif ( ! empty($this->database))

				{

					$this->dsn .= 'DSN='.$this->database;

				}

				return;

			}

			// If the DSN is not pre-configured - try to build an IBM DB2 connection string

			$this->dsn .= 'DRIVER='.(isset($this->DRIVER) ? '{'.$this->DRIVER.'}' : '{IBM DB2 ODBC DRIVER}').';';

			if (isset($this->DATABASE))

			{

				$this->dsn .= 'DATABASE='.$this->DATABASE.';';

			}

			elseif ( ! empty($this->database))

			{

				$this->dsn .= 'DATABASE='.$this->database.';';

			}

			if (isset($this->HOSTNAME))

			{

				$this->dsn .= 'HOSTNAME='.$this->HOSTNAME.';';

			}

			else

			{

				$this->dsn .= 'HOSTNAME='.(empty($this->hostname) ? '127.0.0.1;' : $this->hostname.';');

			}

			if (isset($this->PORT))

			{

				$this->dsn .= 'PORT='.$this->port.';';

			}

			elseif ( ! empty($this->port))

			{

				$this->dsn .= ';PORT='.$this->port.';';

			}

			$this->dsn .= 'PROTOCOL='.(isset($this->PROTOCOL) ? $this->PROTOCOL.';' : 'TCPIP;');

		}

	}

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

	/**

	 * Platform-dependent string escape

	 *

	 * @param	string

	 * @return	string

	 */

	protected function _escape_str($str)

	{

		$this->display_error('db_unsupported_feature');

	}

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

	/**

	 * Determines if a query is a "write" type.

	 *

	 * @param	string	An SQL query string

	 * @return	bool

	 */

	public function is_write_type($sql)

	{

		if (preg_match('#^(INSERT|UPDATE).*RETURNING\s.+(\,\s?.+)*$#is', $sql))

		{

			return FALSE;

		}

		return parent::is_write_type($sql);

	}

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

	/**

	 * 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)

	{

		$sql = "SELECT table_name FROM information_schema.tables WHERE table_schema = '".$this->schema."'";

		if ($prefix_limit !== FALSE && $this->dbprefix !== '')

		{

			return $sql." AND table_name LIKE '".$this->escape_like_str($this->dbprefix)."%' "

				.sprintf($this->_like_escape_str, $this->_like_escape_chr);

		}

		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 'SELECT column_name FROM information_schema.columns WHERE table_name = '.$this->escape($table);

	}

}