<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.2.4 or newer * * NOTICE OF LICENSE * * Licensed under the Open Software License version 3.0 * * This source file is subject to the Open Software License (OSL 3.0) that is * bundled with this package in the files license.txt / license.rst. It is * also available through the world wide web at this URL: * http://opensource.org/licenses/OSL-3.0 * If you did not receive a copy of the license and are unable to obtain it * through the world wide web, please send an email to * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @link http://codeigniter.com * @since Version 1.0 * @filesource */ /** * SQLite 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 EllisLab Dev Team * @link http://codeigniter.com/user_guide/database/ */ class CI_DB_sqlite_driver extends CI_DB { public $dbdriver = 'sqlite'; // The character used to escape with - not needed for SQLite protected $_escape_char = ''; // clause and character used for LIKE escape sequences protected $_like_escape_str = " ESCAPE '%s' "; protected $_like_escape_chr = '!'; /** * The syntax to count rows is slightly different across different * database engines, so this string appears in each driver and is * used for the count_all() and count_all_results() functions. */ protected $_count_string = 'SELECT COUNT(*) AS '; protected $_random_keyword = ' Random()'; // database specific random keyword /** * Non-persistent database connection * * @return resource */ public function db_connect() { if ( ! $conn_id = @sqlite_open($this->database, FILE_WRITE_MODE, $error)) { log_message('error', $error); if ($this->db_debug) { $this->display_error($error, '', TRUE); } return FALSE; } return $conn_id; } // -------------------------------------------------------------------- /** * Persistent database connection * * @return resource */ public function db_pconnect() { if ( ! $conn_id = @sqlite_popen($this->database, FILE_WRITE_MODE, $error)) { log_message('error', $error); if ($this->db_debug) { $this->display_error($error, '', TRUE); } return FALSE; } return $conn_id; } // -------------------------------------------------------------------- /** * Database version number * * @return string */ public function version() { return isset($this->data_cache['version']) ? $this->data_cache['version'] : $this->data_cache['version'] = sqlite_libversion(); } // -------------------------------------------------------------------- /** * Execute the query * * @param string an SQL query * @return resource */ protected function _execute($sql) { return @sqlite_query($this->conn_id, $sql); } // -------------------------------------------------------------------- /** * Begin Transaction * * @return bool */ public function trans_begin($test_mode = FALSE) { if ( ! $this->trans_enabled) { return TRUE; } // When transactions are nested we only begin/commit/rollback the outermost ones if ($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) ? TRUE : FALSE; $this->simple_query('BEGIN TRANSACTION'); return TRUE; } // -------------------------------------------------------------------- /** * Commit Transaction * * @return bool */ public function trans_commit() { if ( ! $this->trans_enabled) { return TRUE; } // When transactions are nested we only begin/commit/rollback the outermost ones if ($this->_trans_depth > 0) { return TRUE; } $this->simple_query('COMMIT'); return TRUE; } // -------------------------------------------------------------------- /** * Rollback Transaction * * @return bool */ public function trans_rollback() { if ( ! $this->trans_enabled) { return TRUE; } // When transactions are nested we only begin/commit/rollback the outermost ones if ($this->_trans_depth > 0) { return TRUE; } $this->simple_query('ROLLBACK'); return TRUE; } // -------------------------------------------------------------------- /** * Escape String * * @param string * @param bool whether or not the string will be used in a LIKE condition * @return string */ public function escape_str($str, $like = FALSE) { if (is_array($str)) { foreach ($str as $key => $val) { $str[$key] = $this->escape_str($val, $like); } return $str; } $str = sqlite_escape_string($str); // escape LIKE condition wildcards if ($like === TRUE) { return str_replace(array($this->_like_escape_chr, '%', '_'), array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'), $str); } return $str; } // -------------------------------------------------------------------- /** * Affected Rows * * @return int */ public function affected_rows() { return sqlite_changes($this->conn_id); } // -------------------------------------------------------------------- /** * Insert ID * * @return int */ public function insert_id() { return @sqlite_last_insert_rowid($this->conn_id); } // -------------------------------------------------------------------- /** * List table query * * Generates a platform-specific query string so that the table names can be fetched * * @param bool * @return string */ protected function _list_tables($prefix_limit = FALSE) { $sql = "SELECT name from sqlite_master WHERE type='table'"; if ($prefix_limit !== FALSE && $this->dbprefix != '') { $sql .= " AND 'name' LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr); } return $sql; } // -------------------------------------------------------------------- /** * Show column query * * Generates a platform-specific query string so that the column names can be fetched * * @param string the table name * @return bool */ protected function _list_columns($table = '') { // Not supported return FALSE; } // -------------------------------------------------------------------- /** * Field data query * * Generates a platform-specific query so that the column data can be retrieved * * @param string the table name * @return string */ protected function _field_data($table) { return "SELECT * FROM ".$table." LIMIT 1"; } // -------------------------------------------------------------------- /** * Error * * Returns an array containing code and message of the last * database error that has occured. * * @return array */ public function error() { $error = array('code' => sqlite_last_error($this->conn_id)); $error['message'] = sqlite_error_string($error['code']); return $error; } // -------------------------------------------------------------------- /** * From Tables * * This function implicitly groups FROM tables so there is no confusion * about operator precedence in harmony with SQL standards * * @param array * @return string */ protected function _from_tables($tables) { if ( ! is_array($tables)) { $tables = array($tables); } return '('.implode(', ', $tables).')'; } // -------------------------------------------------------------------- /** * Replace statement * * Generates a platform-specific replace string from the supplied data * * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ protected function _replace($table, $keys, $values) { return 'INSERT OR '.parent::_replace($table, $keys, $values); } // -------------------------------------------------------------------- /** * Truncate statement * * Generates a platform-specific truncate string from the supplied data * * If the database does not support the truncate() command, * then this function maps to 'DELETE FROM table' * * @param string the table name * @return string */ protected function _truncate($table) { return 'DELETE FROM '.$table; } // -------------------------------------------------------------------- /** * Limit string * * Generates a platform-specific LIMIT clause * * @param string the sql query string * @param int the number of rows to limit the query to * @param int the offset value * @return string */ protected function _limit($sql, $limit, $offset) { if ($offset == 0) { $offset = ''; } else { $offset .= ', '; } return $sql.'LIMIT '.$offset.$limit; } // -------------------------------------------------------------------- /** * Close DB Connection * * @return void */ protected function _close() { @sqlite_close($this->conn_id); } } /* End of file sqlite_driver.php */ /* Location: ./system/database/drivers/sqlite/sqlite_driver.php */