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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 - 2019, 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 - 2019, British Columbia Institute of Technology (http://bcit.ca/) * @license http://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 1.3.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * SQLite Forge Class * * @category Database * @author EllisLab Dev Team * @link https://codeigniter.com/user_guide/database/ */ class CI_DB_sqlite_forge extends CI_DB_forge { /** * CREATE TABLE IF statement * * @var string */ protected $_create_table_if = FALSE; /** * UNSIGNED support * * @var bool|array */ protected $_unsigned = FALSE; /** * NULL value representation in CREATE/ALTER TABLE statements * * @var string */ protected $_null = 'NULL'; // -------------------------------------------------------------------- /** * Create database * * @param string $db_name (ignored) * @return bool */ public function create_database($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) { if ( ! file_exists($this->db->database) OR ! @unlink($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; } // -------------------------------------------------------------------- /** * 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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