657 行
无行尾
14 KiB
PHP
657 行
无行尾
14 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 5.1.6 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) 2008 - 2011, 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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var $dbdriver = 'sqlite';
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// The character used to escape with - not needed for SQLite
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var $_escape_char = '';
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// clause and character used for LIKE escape sequences
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var $_like_escape_str = " ESCAPE '%s' ";
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var $_like_escape_chr = '!';
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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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* Reconnect
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*
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* Keep / reestablish the db connection if no queries have been
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* sent for a length of time exceeding the server's idle timeout
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*
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* @access public
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* @return void
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*/
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function reconnect()
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{
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// not implemented in SQLite
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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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$this->simple_query('ROLLBACK');
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Escape String
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*
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* @access public
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* @param string
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* @param bool whether or not the string will be used in a LIKE condition
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* @return string
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*/
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function escape_str($str, $like = FALSE)
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{
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if (is_array($str))
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{
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foreach ($str as $key => $val)
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{
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$str[$key] = $this->escape_str($val, $like);
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}
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return $str;
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}
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$str = sqlite_escape_string($str);
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// escape LIKE condition wildcards
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if ($like === TRUE)
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{
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$str = str_replace( array('%', '_', $this->_like_escape_chr),
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array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr),
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$str);
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}
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return $str;
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @access public
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* @return integer
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*/
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function affected_rows()
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{
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return sqlite_changes($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 ($table == '')
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{
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return 0;
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}
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$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows') . " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));
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if ($query->num_rows() == 0)
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{
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return 0;
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}
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$row = $query->row();
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return (int) $row->numrows;
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}
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// --------------------------------------------------------------------
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/**
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* List table query
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*
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* Generates a platform-specific query string so that the table names can be fetched
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*
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* @access private
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* @param boolean
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* @return string
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*/
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function _list_tables($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 '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr);
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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($table)
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{
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return "SELECT * FROM ".$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 the SQL Identifiers
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*
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* This function escapes column and table names
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*
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* @access private
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* @param string
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* @return string
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*/
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function _escape_identifiers($item)
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{
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if ($this->_escape_char == '')
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{
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return $item;
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}
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foreach ($this->_reserved_identifiers as $id)
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{
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if (strpos($item, '.'.$id) !== FALSE)
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{
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$str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item);
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// remove duplicates if the user already included the escape
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return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
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}
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}
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if (strpos($item, '.') !== FALSE)
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{
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$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;
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}
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else
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{
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$str = $this->_escape_char.$item.$this->_escape_char;
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}
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// remove duplicates if the user already included the escape
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return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);
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}
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// --------------------------------------------------------------------
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/**
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* From Tables
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*
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* This function implicitly groups FROM tables so there is no confusion
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* about operator precedence in harmony with SQL standards
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*
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* @access public
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* @param type
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* @return type
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*/
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function _from_tables($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, $values)
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{
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return "INSERT INTO ".$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 ".$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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/* End of file sqlite_driver.php */
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/* Location: ./system/database/drivers/sqlite/sqlite_driver.php */ |