<?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 */ /** * 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/ * @since Version 3.0 */ class CI_DB_sqlite3_driver extends CI_DB { public $dbdriver = 'sqlite3'; // The character used for escaping 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()'; /** * Non-persistent database connection * * @return object type SQLite3 */ public function db_connect() { 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; } } // -------------------------------------------------------------------- /** * Persistent database connection * * @return object type SQLite3 */ public function db_pconnect() { log_message('debug', 'SQLite3 doesn\'t support persistent connections'); return $this->db_pconnect(); } // -------------------------------------------------------------------- /** * Database version number * * @return string */ public function version() { if (isset($this->data_cache['version'])) { return $this->data_cache['version']; } $version = $this->conn_id->version(); return $this->data_cache['version'] = $version['versionString']; } // -------------------------------------------------------------------- /** * Execute the query * * @param string an SQL query * @return mixed SQLite3Result object or bool */ protected function _execute($sql) { // TODO: Implement use of SQLite3::querySingle(), if needed return $this->is_write_type($sql) ? $this->conn_id->exec($sql) : $this->conn_id->query($sql); } // -------------------------------------------------------------------- /** * Begin Transaction * * @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 $this->conn_id->exec('ROLLBACK'); } // -------------------------------------------------------------------- /** * Escape String * * @param string * @param bool whether or not the string will be used in a LIKE condition * @return string */ public function escape_str($str, $like = FALSE) { if (is_array($str)) { foreach ($str as $key => $val) { $str[$key] = $this->escape_str($val, $like); } return $str; } $str = $this->conn_id->escapeString(remove_invisible_characters($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 $this->conn_id->changes(); } // -------------------------------------------------------------------- /** * Insert ID * * @return int */ public function insert_id() { return $this->conn_id->lastInsertRowID(); } // -------------------------------------------------------------------- /** * "Count All" query * * Generates a platform-specific query string that counts all records in * the specified database * * @param string * @return int */ public function count_all($table = '') { if ($table == '') { return 0; } $result = $this->conn_id->querySingle($this->_count_string.$this->protect_identifiers('numrows') .' FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE)); return empty($result) ? 0 : (int) $result; } // -------------------------------------------------------------------- /** * Show table query * * Generates a platform-specific query string so that the table names can be fetched * * @param bool * @return string */ protected function _list_tables($prefix_limit = FALSE) { 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, $this->_like_escape_chr) : ''); } // -------------------------------------------------------------------- /** * Show column query * * Generates a platform-specific query string so that the column names can be fetched * * @param string the table name * @return string */ protected function _list_columns($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 0,1'; } // -------------------------------------------------------------------- /** * The error message string * * @return string */ protected function _error_message() { return $this->conn_id->lastErrorMsg(); } // -------------------------------------------------------------------- /** * The error message number * * @return int */ protected function _error_number() { return $this->conn_id->lastErrorCode(); } // -------------------------------------------------------------------- /** * From Tables * * This function implicitly groups FROM tables so there is no confusion * about operator precedence in harmony with SQL standards * * @param string * @return string */ protected function _from_tables($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, $values); } // -------------------------------------------------------------------- /** * Truncate statement * * Generates a platform-specific truncate string from the supplied data * * If the database does not support the truncate() command, then, * then this method maps to 'DELETE FROM table' * * @param string the table name * @return string */ protected function _truncate($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) { return $sql.' LIMIT '.($offset ? $offset.',' : '').$limit; } // -------------------------------------------------------------------- /** * Close DB Connection * * @param object (ignored) * @return void */ protected function _close($conn_id) { $this->conn_id->close(); } } /* End of file sqlite3_driver.php */ /* Location: ./system/database/drivers/sqlite3/sqlite3_driver.php */