361 lines
8.7 KiB
PHP
361 lines
8.7 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 - 2015, 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. (http://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://opensource.org/licenses/MIT MIT License
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* @link http://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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* SQLite3 Database Adapter Class
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*
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* Note: _DB is an extender class that the app controller
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* creates dynamically based on whether the query builder
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* class is being used or not.
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*
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* @package CodeIgniter
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* @subpackage Drivers
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* @category Database
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* @author Andrey Andreev
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* @link http://codeigniter.com/user_guide/database/
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*/
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class CI_DB_sqlite3_driver extends CI_DB {
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/**
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* Database driver
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*
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* @var string
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*/
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public $dbdriver = 'sqlite3';
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// --------------------------------------------------------------------
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/**
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* ORDER BY random keyword
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*
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* @var array
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*/
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protected $_random_keyword = array('RANDOM()', 'RANDOM()');
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// --------------------------------------------------------------------
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/**
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* Non-persistent database connection
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*
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* @param bool $persistent
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* @return SQLite3
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*/
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public function db_connect($persistent = FALSE)
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{
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if ($persistent)
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{
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log_message('debug', 'SQLite3 doesn\'t support persistent connections');
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}
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try
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{
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return ( ! $this->password)
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? new SQLite3($this->database)
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: new SQLite3($this->database, SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE, $this->password);
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}
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catch (Exception $e)
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{
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return FALSE;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Database version number
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*
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* @return string
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*/
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public function version()
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{
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if (isset($this->data_cache['version']))
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{
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return $this->data_cache['version'];
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}
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$version = SQLite3::version();
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return $this->data_cache['version'] = $version['versionString'];
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}
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// --------------------------------------------------------------------
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/**
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* Execute the query
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*
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* @todo Implement use of SQLite3::querySingle(), if needed
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* @param string $sql
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* @return mixed SQLite3Result object or bool
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*/
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protected function _execute($sql)
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{
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return $this->is_write_type($sql)
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? $this->conn_id->exec($sql)
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: $this->conn_id->query($sql);
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}
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// --------------------------------------------------------------------
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/**
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* Begin Transaction
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*
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* @param bool $test_mode
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* @return bool
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*/
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public function trans_begin($test_mode = FALSE)
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{
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
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{
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return TRUE;
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}
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// Reset the transaction failure flag.
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// If the $test_mode flag is set to TRUE transactions will be rolled back
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// even if the queries produce a successful result.
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$this->_trans_failure = ($test_mode === TRUE);
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return $this->conn_id->exec('BEGIN TRANSACTION');
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}
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// --------------------------------------------------------------------
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/**
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* Commit Transaction
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*
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* @return bool
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*/
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public function trans_commit()
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{
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
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{
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return TRUE;
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}
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return $this->conn_id->exec('END TRANSACTION');
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}
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// --------------------------------------------------------------------
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/**
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* Rollback Transaction
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*
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* @return bool
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*/
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public function trans_rollback()
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{
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
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{
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return TRUE;
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}
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return $this->conn_id->exec('ROLLBACK');
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}
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// --------------------------------------------------------------------
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/**
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* Platform-dependant string escape
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*
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* @param string
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* @return string
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*/
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protected function _escape_str($str)
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{
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return $this->conn_id->escapeString($str);
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @return int
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*/
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public function affected_rows()
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{
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return $this->conn_id->changes();
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}
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// --------------------------------------------------------------------
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/**
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* Insert ID
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*
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* @return int
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*/
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public function insert_id()
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{
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return $this->conn_id->lastInsertRowID();
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}
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// --------------------------------------------------------------------
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/**
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* Show table query
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*
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* Generates a platform-specific query string so that the table names can be fetched
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*
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* @param bool $prefix_limit
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* @return string
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*/
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protected function _list_tables($prefix_limit = FALSE)
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{
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return 'SELECT "NAME" FROM "SQLITE_MASTER" WHERE "TYPE" = \'table\''
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.(($prefix_limit !== FALSE && $this->dbprefix != '')
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? ' AND "NAME" LIKE \''.$this->escape_like_str($this->dbprefix).'%\' '.sprintf($this->_like_escape_str, $this->_like_escape_chr)
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: '');
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}
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// --------------------------------------------------------------------
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/**
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* Show column query
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*
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* Generates a platform-specific query string so that the column names can be fetched
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*
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* @param string $table
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* @return string
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*/
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protected function _list_columns($table = '')
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{
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// Not supported
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return FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Returns an object with field data
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*
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* @param string $table
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* @return array
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*/
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public function field_data($table)
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{
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if (($query = $this->query('PRAGMA TABLE_INFO('.$this->protect_identifiers($table, TRUE, NULL, FALSE).')')) === FALSE)
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{
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return FALSE;
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}
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$query = $query->result_array();
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if (empty($query))
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{
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return FALSE;
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}
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$retval = array();
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for ($i = 0, $c = count($query); $i < $c; $i++)
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{
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$retval[$i] = new stdClass();
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$retval[$i]->name = $query[$i]['name'];
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$retval[$i]->type = $query[$i]['type'];
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$retval[$i]->max_length = NULL;
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$retval[$i]->default = $query[$i]['dflt_value'];
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$retval[$i]->primary_key = isset($query[$i]['pk']) ? (int) $query[$i]['pk'] : 0;
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}
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return $retval;
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}
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// --------------------------------------------------------------------
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/**
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* Error
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*
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* Returns an array containing code and message of the last
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* database error that has occured.
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*
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* @return array
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*/
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public function error()
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{
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return array('code' => $this->conn_id->lastErrorCode(), 'message' => $this->conn_id->lastErrorMsg());
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}
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// --------------------------------------------------------------------
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/**
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* Replace statement
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*
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* Generates a platform-specific replace string from the supplied data
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*
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* @param string $table Table name
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* @param array $keys INSERT keys
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* @param array $values INSERT values
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* @return string
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*/
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protected function _replace($table, $keys, $values)
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{
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return 'INSERT OR '.parent::_replace($table, $keys, $values);
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}
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// --------------------------------------------------------------------
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/**
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* Truncate statement
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*
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* Generates a platform-specific truncate string from the supplied data
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*
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* If the database does not support the TRUNCATE statement,
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* then this method maps to 'DELETE FROM table'
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*
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* @param string $table
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* @return string
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*/
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protected function _truncate($table)
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{
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return 'DELETE FROM '.$table;
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}
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// --------------------------------------------------------------------
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/**
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* Close DB Connection
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*
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* @return void
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*/
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protected function _close()
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{
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$this->conn_id->close();
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}
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}
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