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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 - 2015, 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. (http://ellislab.com/)
* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link http://codeigniter.com
* @since Version 3.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* SQLite3 Database Adapter Class
*
* Note: _DB is an extender class that the app controller
* creates dynamically based on whether the query builder
* class is being used or not.
*
* @package CodeIgniter
* @subpackage Drivers
* @category Database
* @author Andrey Andreev
* @link http://codeigniter.com/user_guide/database/
*/
class CI_DB_sqlite3_driver extends CI_DB {
/**
* Database driver
*
* @var string
*/
public $dbdriver = 'sqlite3';
// --------------------------------------------------------------------
/**
* ORDER BY random keyword
*
* @var array
*/
protected $_random_keyword = array('RANDOM()', 'RANDOM()');
// --------------------------------------------------------------------
/**
* Non-persistent database connection
*
* @param bool $persistent
* @return SQLite3
*/
public function db_connect($persistent = FALSE)
{
if ($persistent)
{
log_message('debug', 'SQLite3 doesn\'t support persistent connections');
}
try
{
return ( ! $this->password)
? new SQLite3($this->database)
: new SQLite3($this->database, SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE, $this->password);
}
catch (Exception $e)
{
return FALSE;
}
}
// --------------------------------------------------------------------
/**
* Database version number
*
* @return string
*/
public function version()
{
if (isset($this->data_cache['version']))
{
return $this->data_cache['version'];
}
$version = SQLite3::version();
return $this->data_cache['version'] = $version['versionString'];
}
// --------------------------------------------------------------------
/**
* Execute the query
*
* @todo Implement use of SQLite3::querySingle(), if needed
* @param string $sql
* @return mixed SQLite3Result object or bool
*/
protected function _execute($sql)
{
return $this->is_write_type($sql)
? $this->conn_id->exec($sql)
: $this->conn_id->query($sql);
}
// --------------------------------------------------------------------
/**
* Begin Transaction
*
* @param bool $test_mode
* @return bool
*/
public function trans_begin($test_mode = FALSE)
{
// When transactions are nested we only begin/commit/rollback the outermost ones
if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
{
return TRUE;
}
// Reset the transaction failure flag.
// If the $test_mode flag is set to TRUE transactions will be rolled back
// even if the queries produce a successful result.
$this->_trans_failure = ($test_mode === TRUE);
return $this->conn_id->exec('BEGIN TRANSACTION');
}
// --------------------------------------------------------------------
/**
* Commit Transaction
*
* @return bool
*/
public function trans_commit()
{
// When transactions are nested we only begin/commit/rollback the outermost ones
if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
{
return TRUE;
}
return $this->conn_id->exec('END TRANSACTION');
}
// --------------------------------------------------------------------
/**
* Rollback Transaction
*
* @return bool
*/
public function trans_rollback()
{
// When transactions are nested we only begin/commit/rollback the outermost ones
if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
{
return TRUE;
}
return $this->conn_id->exec('ROLLBACK');
}
// --------------------------------------------------------------------
/**
* Platform-dependant string escape
*
* @param string
* @return string
*/
protected function _escape_str($str)
{
return $this->conn_id->escapeString($str);
}
// --------------------------------------------------------------------
/**
* Affected Rows
*
* @return int
*/
public function affected_rows()
{
return $this->conn_id->changes();
}
// --------------------------------------------------------------------
/**
* Insert ID
*
* @return int
*/
public function insert_id()
{
return $this->conn_id->lastInsertRowID();
}
// --------------------------------------------------------------------
/**
* Show table query
*
* Generates a platform-specific query string so that the table names can be fetched
*
* @param bool $prefix_limit
* @return string
*/
protected function _list_tables($prefix_limit = FALSE)
{
return 'SELECT "NAME" FROM "SQLITE_MASTER" WHERE "TYPE" = \'table\''
.(($prefix_limit !== FALSE && $this->dbprefix != '')
? ' AND "NAME" LIKE \''.$this->escape_like_str($this->dbprefix).'%\' '.sprintf($this->_like_escape_str, $this->_like_escape_chr)
: '');
}
// --------------------------------------------------------------------
/**
* Fetch Field Names
*
* @param string $table Table name
* @return array
*/
public function list_fields($table)
{
// Is there a cached result?
if (isset($this->data_cache['field_names'][$table]))
{
return $this->data_cache['field_names'][$table];
}
if (($result = $this->query('PRAGMA TABLE_INFO('.$this->protect_identifiers($table, TRUE, NULL, FALSE).')')) === FALSE)
{
return FALSE;
}
$this->data_cache['field_names'][$table] = array();
foreach ($result->result_array() as $row)
{
$this->data_cache['field_names'][$table][] = $row['name'];
}
return $this->data_cache['field_names'][$table];
}
// --------------------------------------------------------------------
/**
* Returns an object with field data
*
* @param string $table
* @return array
*/
public function field_data($table)
{
if (($query = $this->query('PRAGMA TABLE_INFO('.$this->protect_identifiers($table, TRUE, NULL, FALSE).')')) === FALSE)
{
return FALSE;
}
$query = $query->result_array();
if (empty($query))
{
return FALSE;
}
$retval = array();
for ($i = 0, $c = count($query); $i < $c; $i++)
{
$retval[$i] = new stdClass();
$retval[$i]->name = $query[$i]['name'];
$retval[$i]->type = $query[$i]['type'];
$retval[$i]->max_length = NULL;
$retval[$i]->default = $query[$i]['dflt_value'];
$retval[$i]->primary_key = isset($query[$i]['pk']) ? (int) $query[$i]['pk'] : 0;
}
return $retval;
}
// --------------------------------------------------------------------
/**
* Error
*
* Returns an array containing code and message of the last
* database error that has occured.
*
* @return array
*/
public function error()
{
return array('code' => $this->conn_id->lastErrorCode(), 'message' => $this->conn_id->lastErrorMsg());
}
// --------------------------------------------------------------------
/**
* Replace statement
*
* Generates a platform-specific replace string from the supplied data
*
* @param string $table Table name
* @param array $keys INSERT keys
* @param array $values INSERT values
* @return string
*/
protected function _replace($table, $keys, $values)
{
return 'INSERT OR '.parent::_replace($table, $keys, $values);
}
// --------------------------------------------------------------------
/**
* Truncate statement
*
* Generates a platform-specific truncate string from the supplied data
*
* If the database does not support the TRUNCATE statement,
* then this method maps to 'DELETE FROM table'
*
* @param string $table
* @return string
*/
protected function _truncate($table)
{
return 'DELETE FROM '.$table;
}
// --------------------------------------------------------------------
/**
* Close DB Connection
*
* @return void
*/
protected function _close()
{
$this->conn_id->close();
}
}
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