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Editing: sqlite3_forge.php

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2019 - 2022, CodeIgniter Foundation
 *
 * 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @copyright	Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
 * @license	https://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/userguide3/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();
		}
	}

}

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