mirror of
https://github.com/claudehohl/Stikked.git
synced 2025-05-07 03:53:42 -05:00
661 lines
15 KiB
PHP
661 lines
15 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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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 4.3.2 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2006, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* SQLite 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 active record
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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 ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/database/
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*/
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class CI_DB_sqlite_driver extends CI_DB {
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/**
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* The syntax to count rows is slightly different across different
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* database engines, so this string appears in each driver and is
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* used for the count_all() and count_all_results() functions.
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*/
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var $_count_string = "SELECT COUNT(*) AS ";
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var $_random_keyword = ' Random()'; // database specific random keyword
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/**
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* Non-persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_connect()
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{
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if ( ! $conn_id = @sqlite_open($this->database, FILE_WRITE_MODE, $error))
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{
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log_message('error', $error);
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if ($this->db_debug)
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{
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$this->display_error($error, '', TRUE);
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}
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return FALSE;
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}
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return $conn_id;
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}
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// --------------------------------------------------------------------
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/**
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* Persistent database connection
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_pconnect()
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{
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if ( ! $conn_id = @sqlite_popen($this->database, FILE_WRITE_MODE, $error))
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{
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log_message('error', $error);
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if ($this->db_debug)
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{
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$this->display_error($error, '', TRUE);
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}
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return FALSE;
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}
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return $conn_id;
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}
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// --------------------------------------------------------------------
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/**
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* Select the database
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*
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* @access private called by the base class
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* @return resource
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*/
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function db_select()
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{
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Set client character set
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*
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* @access public
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* @param string
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* @param string
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* @return resource
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*/
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function db_set_charset($charset, $collation)
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{
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// TODO - add support if needed
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Version number query string
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*
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* @access public
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* @return string
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*/
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function _version()
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{
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return sqlite_libversion();
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}
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// --------------------------------------------------------------------
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/**
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* Execute the query
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*
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* @access private called by the base class
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* @param string an SQL query
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* @return resource
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*/
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function _execute($sql)
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{
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$sql = $this->_prep_query($sql);
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return @sqlite_query($this->conn_id, $sql);
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}
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// --------------------------------------------------------------------
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/**
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* Prep the query
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*
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* If needed, each database adapter can prep the query string
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*
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* @access private called by execute()
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* @param string an SQL query
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* @return string
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*/
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function _prep_query($sql)
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{
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Begin Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_begin($test_mode = FALSE)
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_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 = ($test_mode === TRUE) ? TRUE : FALSE;
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$this->simple_query('BEGIN TRANSACTION');
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return TRUE;
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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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* @access public
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* @return bool
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*/
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function trans_commit()
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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$this->simple_query('COMMIT');
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return TRUE;
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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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* @access public
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* @return bool
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*/
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function trans_rollback()
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{
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if ( ! $this->trans_enabled)
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{
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return TRUE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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return TRUE;
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}
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$this->simple_query('ROLLBACK');
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Escape String
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*
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* @access public
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* @param string
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* @return string
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*/
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function escape_str($str)
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{
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return sqlite_escape_string($str);
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @access public
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* @return integer
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*/
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function affected_rows()
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{
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return sqlite_changes($this->conn_id);
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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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* @access public
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* @return integer
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*/
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function insert_id()
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{
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return @sqlite_last_insert_rowid($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* "Count All" query
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*
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* Generates a platform-specific query string that counts all records in
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* the specified database
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*
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* @access public
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* @param string
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* @return string
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*/
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function count_all($table = '')
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{
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if ($table == '')
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return '0';
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$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows'). " FROM " . $this->_protect_identifiers($this->dbprefix.$table));
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if ($query->num_rows() == 0)
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return '0';
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$row = $query->row();
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return $row->numrows;
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}
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// --------------------------------------------------------------------
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/**
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* List table query
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*
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* Generates a platform-specific query string so that the table names can be fetched
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*
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* @access private
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* @param boolean
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* @return string
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*/
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function _list_tables($prefix_limit = FALSE)
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{
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$sql = "SELECT name from sqlite_master WHERE type='table'";
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if ($prefix_limit !== FALSE AND $this->dbprefix != '')
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{
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$sql .= " AND 'name' LIKE '".$this->dbprefix."%'";
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Show column query
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*
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* Generates a platform-specific query string so that the column names can be fetched
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*
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* @access public
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* @param string the table name
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* @return string
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*/
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function _list_columns($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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* Field data query
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*
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* Generates a platform-specific query so that the column data can be retrieved
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*
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* @access public
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* @param string the table name
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* @return object
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*/
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function _field_data($table)
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{
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return "SELECT * FROM ".$this->_escape_table($table)." LIMIT 1";
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}
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// --------------------------------------------------------------------
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/**
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* The error message string
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*
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* @access private
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* @return string
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*/
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function _error_message()
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{
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return sqlite_error_string(sqlite_last_error($this->conn_id));
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}
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// --------------------------------------------------------------------
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/**
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* The error message number
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*
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* @access private
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* @return integer
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*/
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function _error_number()
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{
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return sqlite_last_error($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Escape Table Name
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*
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* This function adds backticks if the table name has a period
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* in it. Some DBs will get cranky unless periods are escaped
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*
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* @access private
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* @param string the table name
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* @return string
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*/
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function _escape_table($table)
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{
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// other database drivers use this to add backticks, hence this
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// function is simply going to return the tablename for sqlite
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return $table;
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}
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// --------------------------------------------------------------------
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/**
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* Protect Identifiers
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*
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* This function adds backticks if appropriate based on db type
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*
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* @access private
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* @param mixed the item to escape
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* @param boolean only affect the first word
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* @return mixed the item with backticks
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*/
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function _protect_identifiers($item, $first_word_only = FALSE)
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{
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if (is_array($item))
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{
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$escaped_array = array();
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foreach($item as $k=>$v)
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{
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$escaped_array[$this->_protect_identifiers($k)] = $this->_protect_identifiers($v, $first_word_only);
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}
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return $escaped_array;
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}
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// This function may get "item1 item2" as a string, and so
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// we may need "item1 item2" and not "item1 item2"
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if (ctype_alnum($item) === FALSE)
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{
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if (strpos($item, '.') !== FALSE)
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{
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$aliased_tables = implode(".",$this->ar_aliased_tables).'.';
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$table_name = substr($item, 0, strpos($item, '.')+1);
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$item = (strpos($aliased_tables, $table_name) !== FALSE) ? $item = $item : $this->dbprefix.$item;
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}
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// This function may get "field >= 1", and need it to return "field >= 1"
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$lbound = ($first_word_only === TRUE) ? '' : '|\s|\(';
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$item = preg_replace('/(^'.$lbound.')([\w\d\-\_]+?)(\s|\)|$)/iS', '$1$2$3', $item);
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}
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else
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{
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return "{$item}";
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}
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$exceptions = array('AS', '/', '-', '%', '+', '*', 'OR', 'IS');
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foreach ($exceptions as $exception)
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{
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if (stristr($item, " {$exception} ") !== FALSE)
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{
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$item = preg_replace('/ ('.preg_quote($exception).') /i', ' $1 ', $item);
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}
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}
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return $item;
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}
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// --------------------------------------------------------------------
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/**
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* From Tables
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*
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* This function implicitly groups FROM tables so there is no confusion
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* about operator precedence in harmony with SQL standards
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*
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* @access public
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* @param type
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* @return type
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*/
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function _from_tables($tables)
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{
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if ( ! is_array($tables))
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{
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$tables = array($tables);
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}
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return '('.implode(', ', $tables).')';
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}
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// --------------------------------------------------------------------
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/**
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* Insert statement
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*
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* Generates a platform-specific insert string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the insert keys
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* @param array the insert values
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* @return string
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*/
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function _insert($table, $keys, $values)
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{
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return "INSERT INTO ".$this->_escape_table($table)." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
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}
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// --------------------------------------------------------------------
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/**
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* Update statement
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*
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* Generates a platform-specific update string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the update data
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* @param array the where clause
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* @param array the orderby clause
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* @param array the limit clause
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* @return string
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*/
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function _update($table, $values, $where, $orderby = array(), $limit = FALSE)
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{
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foreach($values as $key => $val)
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{
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$valstr[] = $key." = ".$val;
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}
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$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
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$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';
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$sql = "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr);
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$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';
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$sql .= $orderby.$limit;
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Truncate statement
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*
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* Generates a platform-specific truncate string from the supplied data
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* If the database does not support the truncate() command
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* This function maps to "DELETE FROM table"
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*
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* @access public
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* @param string the table name
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* @return string
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*/
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function _truncate($table)
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{
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return $this->_delete($table);
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}
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// --------------------------------------------------------------------
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/**
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* Delete statement
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*
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* Generates a platform-specific delete string from the supplied data
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*
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* @access public
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* @param string the table name
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* @param array the where clause
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* @param string the limit clause
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* @return string
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*/
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function _delete($table, $where = array(), $like = array(), $limit = FALSE)
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{
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$conditions = '';
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if (count($where) > 0 OR count($like) > 0)
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{
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$conditions = "\nWHERE ";
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$conditions .= implode("\n", $this->ar_where);
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if (count($where) > 0 && count($like) > 0)
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{
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$conditions .= " AND ";
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}
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$conditions .= implode("\n", $like);
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}
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$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;
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return "DELETE FROM ".$table.$conditions.$limit;
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}
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// --------------------------------------------------------------------
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/**
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* Limit string
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*
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* Generates a platform-specific LIMIT clause
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*
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* @access public
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* @param string the sql query string
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* @param integer the number of rows to limit the query to
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* @param integer the offset value
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* @return string
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*/
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function _limit($sql, $limit, $offset)
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{
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if ($offset == 0)
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{
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$offset = '';
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}
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else
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{
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$offset .= ", ";
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}
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return $sql."LIMIT ".$offset.$limit;
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}
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// --------------------------------------------------------------------
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/**
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* Close DB Connection
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*
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* @access public
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* @param resource
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* @return void
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*/
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function _close($conn_id)
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{
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@sqlite_close($conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Rename a table
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*
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* Generates a platform-specific query so that a table can be renamed
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*
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* @access private
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* @param string the old table name
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* @param string the new table name
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* @return string
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*/
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function _rename_table($table_name, $new_table_name)
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{
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$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
|
|
return $sql;
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
/* End of file sqlite_driver.php */
|
|
/* Location: ./system/database/drivers/sqlite/sqlite_driver.php */ |