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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 IBM DB2 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_ibm_driver extends CI_DB_pdo_driver {

	/**

	 * Sub-driver

	 *

	 * @var	string

	 */

	public $subdriver = 'ibm';

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

	/**

	 * 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 = 'ibm:';

			// 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;

			}

			$this->dsn .= 'DRIVER='.(isset($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;');

		}

	}

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

	/**

	 * 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 "tabname" FROM "syscat"."tables"

			WHERE "type" = \'T\' AND LOWER("tabschema") = '.$this->escape(strtolower($this->database));

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

		{

			$sql .= ' AND "tabname" LIKE \''.$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	array

	 */

	protected function _list_columns($table = '')

	{

		return 'SELECT "colname" FROM "syscat"."columns"

			WHERE LOWER("tabschema") = '.$this->escape(strtolower($this->database)).'

				AND LOWER("tabname") = '.$this->escape(strtolower($table));

	}

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

	/**

	 * Returns an object with field data

	 *

	 * @param	string	$table

	 * @return	array

	 */

	public function field_data($table)

	{

		$sql = 'SELECT "colname" AS "name", "typename" AS "type", "default" AS "default", "length" AS "max_length",

				CASE "keyseq" WHEN NULL THEN 0 ELSE 1 END AS "primary_key"

			FROM "syscat"."columns"

			WHERE LOWER("tabschema") = '.$this->escape(strtolower($this->database)).'

				AND LOWER("tabname") = '.$this->escape(strtolower($table)).'

			ORDER BY "colno"';

		return (($query = $this->query($sql)) !== FALSE)

			? $query->result_object()

			: FALSE;

	}

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

	/**

	 * Update statement

	 *

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

	 *

	 * @param	string	$table

	 * @param	array	$values

	 * @return	string

	 */

	protected function _update($table, $values)

	{

		$this->qb_limit = FALSE;

		$this->qb_orderby = array();

		return parent::_update($table, $values);

	}

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

	/**

	 * Delete statement

	 *

	 * Generates a platform-specific delete string from the supplied data

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _delete($table)

	{

		$this->qb_limit = FALSE;

		return parent::_delete($table);

	}

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

	/**

	 * LIMIT

	 *

	 * Generates a platform-specific LIMIT clause

	 *

	 * @param	string	$sql	SQL Query

	 * @return	string

	 */

	protected function _limit($sql)

	{

		$sql .= ' FETCH FIRST '.($this->qb_limit + $this->qb_offset).' ROWS ONLY';

		return ($this->qb_offset)

			? 'SELECT * FROM ('.$sql.') WHERE rownum > '.$this->qb_offset

			: $sql;

	}

}