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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');

/**

 * SQLite3 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		Andrey Andreev

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

 */

class CI_DB_sqlite3_driver extends CI_DB {

	/**

	 * Database driver

	 *

	 * @var	string

	 */

	public $dbdriver = 'sqlite3';

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

	/**

	 * ORDER BY random keyword

	 *

	 * @var	array

	 */

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

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

	/**

	 * Non-persistent database connection

	 *

	 * @param	bool	$persistent

	 * @return	SQLite3

	 */

	public function db_connect($persistent = FALSE)

	{

		if ($persistent)

		{

			log_message('debug', 'SQLite3 doesn\'t support persistent connections');

		}

		try

		{

			return ( ! $this->password)

				? new SQLite3($this->database)

				: new SQLite3($this->database, SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE, $this->password);

		}

		catch (Exception $e)

		{

			return FALSE;

		}

	}

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

	/**

	 * Database version number

	 *

	 * @return	string

	 */

	public function version()

	{

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

		{

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

		}

		$version = SQLite3::version();

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

	}

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

	/**

	 * Execute the query

	 *

	 * @todo	Implement use of SQLite3::querySingle(), if needed

	 * @param	string	$sql

	 * @return	mixed	SQLite3Result object or bool

	 */

	protected function _execute($sql)

	{

		return $this->is_write_type($sql)

			? $this->conn_id->exec($sql)

			: $this->conn_id->query($sql);

	}

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

	/**

	 * Begin Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_begin()

	{

		return $this->conn_id->exec('BEGIN TRANSACTION');

	}

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

	/**

	 * Commit Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_commit()

	{

		return $this->conn_id->exec('END TRANSACTION');

	}

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

	/**

	 * Rollback Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_rollback()

	{

		return $this->conn_id->exec('ROLLBACK');

	}

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

	/**

	 * Platform-dependent string escape

	 *

	 * @param	string

	 * @return	string

	 */

	protected function _escape_str($str)

	{

		return $this->conn_id->escapeString($str);

	}

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

	/**

	 * Affected Rows

	 *

	 * @return	int

	 */

	public function affected_rows()

	{

		return $this->conn_id->changes();

	}

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

	/**

	 * Insert ID

	 *

	 * @return	int

	 */

	public function insert_id()

	{

		return $this->conn_id->lastInsertRowID();

	}

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

	/**

	 * 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)

	{

		return 'SELECT "NAME" FROM "SQLITE_MASTER" WHERE "TYPE" = \'table\''

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

				? ' AND "NAME" LIKE \''.$this->escape_like_str($this->dbprefix).'%\' '.sprintf($this->_like_escape_str, $this->_like_escape_chr)

				: '');

	}

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

	/**

	 * Fetch Field Names

	 *

	 * @param	string	$table	Table name

	 * @return	array

	 */

	public function list_fields($table)

	{

		// Is there a cached result?

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

		{

			return $this->data_cache['field_names'][$table];

		}

		if (($result = $this->query('PRAGMA TABLE_INFO('.$this->protect_identifiers($table, TRUE, NULL, FALSE).')')) === FALSE)

		{

			return FALSE;

		}

		$this->data_cache['field_names'][$table] = array();

		foreach ($result->result_array() as $row)

		{

			$this->data_cache['field_names'][$table][] = $row['name'];

		}

		return $this->data_cache['field_names'][$table];

	}

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

	/**

	 * Returns an object with field data

	 *

	 * @param	string	$table

	 * @return	array

	 */

	public function field_data($table)

	{

		if (($query = $this->query('PRAGMA TABLE_INFO('.$this->protect_identifiers($table, TRUE, NULL, FALSE).')')) === FALSE)

		{

			return FALSE;

		}

		$query = $query->result_array();

		if (empty($query))

		{

			return FALSE;

		}

		$retval = array();

		for ($i = 0, $c = count($query); $i < $c; $i++)

		{

			$retval[$i]			= new stdClass();

			$retval[$i]->name		= $query[$i]['name'];

			$retval[$i]->type		= $query[$i]['type'];

			$retval[$i]->max_length		= NULL;

			$retval[$i]->default		= $query[$i]['dflt_value'];

			$retval[$i]->primary_key	= isset($query[$i]['pk']) ? (int) $query[$i]['pk'] : 0;

		}

		return $retval;

	}

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

	/**

	 * Error

	 *

	 * Returns an array containing code and message of the last

	 * database error that has occurred.

	 *

	 * @return	array

	 */

	public function error()

	{

		return array('code' => $this->conn_id->lastErrorCode(), 'message' => $this->conn_id->lastErrorMsg());

	}

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

	/**

	 * Replace statement

	 *

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

	 *

	 * @param	string	$table	Table name

	 * @param	array	$keys	INSERT keys

	 * @param	array	$values	INSERT values

	 * @return	string

	 */

	protected function _replace($table, $keys, $values)

	{

		return 'INSERT OR '.parent::_replace($table, $keys, $values);

	}

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

	/**

	 * 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 'DELETE FROM '.$table;

	}

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

	/**

	 * Close DB Connection

	 *

	 * @return	void

	 */

	protected function _close()

	{

		$this->conn_id->close();

	}

}