Subversion-Projekte lars-tiefland.ci

<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2017, 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 - 2017, 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 Forge Class

 *

 * @category	Database

 * @author	Andrey Andreev

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

 */

class CI_DB_sqlite3_forge extends CI_DB_forge {

	/**

	 * UNSIGNED support

	 *

	 * @var	bool|array

	 */

	protected $_unsigned		= FALSE;

	/**

	 * NULL value representation in CREATE/ALTER TABLE statements

	 *

	 * @var	string

	 */

	protected $_null		= 'NULL';

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

	/**

	 * Class constructor

	 *

	 * @param	object	&$db	Database object

	 * @return	void

	 */

	public function __construct(&$db)

	{

		parent::__construct($db);

		if (version_compare($this->db->version(), '3.3', '<'))

		{

			$this->_create_table_if = FALSE;

			$this->_drop_table_if   = FALSE;

		}

	}

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

	/**

	 * Create database

	 *

	 * @param	string	$db_name

	 * @return	bool

	 */

	public function create_database($db_name)

	{

		// In SQLite, a database is created when you connect to the database.

		// We'll return TRUE so that an error isn't generated

		return TRUE;

	}

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

	/**

	 * Drop database

	 *

	 * @param	string	$db_name	(ignored)

	 * @return	bool

	 */

	public function drop_database($db_name)

	{

		// In SQLite, a database is dropped when we delete a file

		if (file_exists($this->db->database))

		{

			// We need to close the pseudo-connection first

			$this->db->close();

			if ( ! @unlink($this->db->database))

			{

				return $this->db->db_debug ? $this->db->display_error('db_unable_to_drop') : FALSE;

			}

			elseif ( ! empty($this->db->data_cache['db_names']))

			{

				$key = array_search(strtolower($this->db->database), array_map('strtolower', $this->db->data_cache['db_names']), TRUE);

				if ($key !== FALSE)

				{

					unset($this->db->data_cache['db_names'][$key]);

				}

			}

			return TRUE;

		}

		return $this->db->db_debug ? $this->db->display_error('db_unable_to_drop') : FALSE;

	}

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

	/**

	 * ALTER TABLE

	 *

	 * @todo	implement drop_column(), modify_column()

	 * @param	string	$alter_type	ALTER type

	 * @param	string	$table		Table name

	 * @param	mixed	$field		Column definition

	 * @return	string|string[]

	 */

	protected function _alter_table($alter_type, $table, $field)

	{

		if ($alter_type === 'DROP' OR $alter_type === 'CHANGE')

		{

			// drop_column():

			//	BEGIN TRANSACTION;

			//	CREATE TEMPORARY TABLE t1_backup(a,b);

			//	INSERT INTO t1_backup SELECT a,b FROM t1;

			//	DROP TABLE t1;

			//	CREATE TABLE t1(a,b);

			//	INSERT INTO t1 SELECT a,b FROM t1_backup;

			//	DROP TABLE t1_backup;

			//	COMMIT;

			return FALSE;

		}

		return parent::_alter_table($alter_type, $table, $field);

	}

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

	/**

	 * Process column

	 *

	 * @param	array	$field

	 * @return	string

	 */

	protected function _process_column($field)

	{

		return $this->db->escape_identifiers($field['name'])

			.' '.$field['type']

			.$field['auto_increment']

			.$field['null']

			.$field['unique']

			.$field['default'];

	}

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

	/**

	 * Field attribute TYPE

	 *

	 * Performs a data type mapping between different databases.

	 *

	 * @param	array	&$attributes

	 * @return	void

	 */

	protected function _attr_type(&$attributes)

	{

		switch (strtoupper($attributes['TYPE']))

		{

			case 'ENUM':

			case 'SET':

				$attributes['TYPE'] = 'TEXT';

				return;

			default: return;

		}

	}

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

	/**

	 * Field attribute AUTO_INCREMENT

	 *

	 * @param	array	&$attributes

	 * @param	array	&$field

	 * @return	void

	 */

	protected function _attr_auto_increment(&$attributes, &$field)

	{

		if ( ! empty($attributes['AUTO_INCREMENT']) && $attributes['AUTO_INCREMENT'] === TRUE && stripos($field['type'], 'int') !== FALSE)

		{

			$field['type'] = 'INTEGER PRIMARY KEY';

			$field['default'] = '';

			$field['null'] = '';

			$field['unique'] = '';

			$field['auto_increment'] = ' AUTOINCREMENT';

			$this->primary_keys = array();

		}

	}

}