239 lines
6.0 KiB
PHP
239 lines
6.0 KiB
PHP
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<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2019, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 3.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* PDO SQLite Forge Class
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*
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* @category Database
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/database/
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*/
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class CI_DB_pdo_sqlite_forge extends CI_DB_pdo_forge {
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/**
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* CREATE TABLE IF statement
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*
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* @var string
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*/
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protected $_create_table_if = 'CREATE TABLE IF NOT EXISTS';
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/**
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* DROP TABLE IF statement
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*
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* @var string
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*/
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protected $_drop_table_if = 'DROP TABLE IF EXISTS';
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/**
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* UNSIGNED support
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*
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* @var bool|array
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*/
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protected $_unsigned = FALSE;
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/**
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* NULL value representation in CREATE/ALTER TABLE statements
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*
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* @var string
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*/
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protected $_null = 'NULL';
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// --------------------------------------------------------------------
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/**
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* Class constructor
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*
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* @param object &$db Database object
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* @return void
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*/
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public function __construct(&$db)
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{
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parent::__construct($db);
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if (version_compare($this->db->version(), '3.3', '<'))
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{
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$this->_create_table_if = FALSE;
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$this->_drop_table_if = FALSE;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Create database
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*
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* @param string $db_name (ignored)
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* @return bool
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*/
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public function create_database($db_name)
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{
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// In SQLite, a database is created when you connect to the database.
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// We'll return TRUE so that an error isn't generated
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Drop database
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*
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* @param string $db_name (ignored)
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* @return bool
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*/
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public function drop_database($db_name)
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{
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// In SQLite, a database is dropped when we delete a file
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if (file_exists($this->db->database))
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{
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// We need to close the pseudo-connection first
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$this->db->close();
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if ( ! @unlink($this->db->database))
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{
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return $this->db->db_debug ? $this->db->display_error('db_unable_to_drop') : FALSE;
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}
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elseif ( ! empty($this->db->data_cache['db_names']))
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{
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$key = array_search(strtolower($this->db->database), array_map('strtolower', $this->db->data_cache['db_names']), TRUE);
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if ($key !== FALSE)
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{
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unset($this->db->data_cache['db_names'][$key]);
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}
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}
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return TRUE;
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}
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return $this->db->db_debug ? $this->db->display_error('db_unable_to_drop') : FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* ALTER TABLE
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*
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* @param string $alter_type ALTER type
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* @param string $table Table name
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* @param mixed $field Column definition
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* @return string|string[]
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*/
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protected function _alter_table($alter_type, $table, $field)
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{
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if ($alter_type === 'DROP' OR $alter_type === 'CHANGE')
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{
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// drop_column():
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// BEGIN TRANSACTION;
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// CREATE TEMPORARY TABLE t1_backup(a,b);
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// INSERT INTO t1_backup SELECT a,b FROM t1;
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// DROP TABLE t1;
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// CREATE TABLE t1(a,b);
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// INSERT INTO t1 SELECT a,b FROM t1_backup;
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// DROP TABLE t1_backup;
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// COMMIT;
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return FALSE;
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}
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return parent::_alter_table($alter_type, $table, $field);
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}
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// --------------------------------------------------------------------
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/**
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* Process column
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*
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* @param array $field
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* @return string
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*/
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protected function _process_column($field)
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{
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return $this->db->escape_identifiers($field['name'])
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.' '.$field['type']
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.$field['auto_increment']
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.$field['null']
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.$field['unique']
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.$field['default'];
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}
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// --------------------------------------------------------------------
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/**
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* Field attribute TYPE
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*
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* Performs a data type mapping between different databases.
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*
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* @param array &$attributes
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* @return void
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*/
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protected function _attr_type(&$attributes)
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{
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switch (strtoupper($attributes['TYPE']))
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{
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case 'ENUM':
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case 'SET':
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$attributes['TYPE'] = 'TEXT';
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return;
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default: return;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Field attribute AUTO_INCREMENT
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*
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* @param array &$attributes
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* @param array &$field
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* @return void
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*/
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protected function _attr_auto_increment(&$attributes, &$field)
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{
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if ( ! empty($attributes['AUTO_INCREMENT']) && $attributes['AUTO_INCREMENT'] === TRUE && stripos($field['type'], 'int') !== FALSE)
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{
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$field['type'] = 'INTEGER PRIMARY KEY';
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$field['default'] = '';
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$field['null'] = '';
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$field['unique'] = '';
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$field['auto_increment'] = ' AUTOINCREMENT';
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$this->primary_keys = array();
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}
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}
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}
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