mirror of
https://github.com/php/php-src.git
synced 2024-10-07 17:56:12 +00:00
f30278b96b
- Defined DB_ERROR_NOSUCHTABLE and DB_ERROR_NOSUCHFIELD - Renamed DB_common::capableOf to DB_common::provides - Cleaned up the error code mapping - Added simpleQuery method in DB_mysql - Changed getXxx methods in DB_common to use simpleQuery - Fixed bug in DB_common::getAssoc
424 lines
12 KiB
PHP
424 lines
12 KiB
PHP
<?php
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//
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// +----------------------------------------------------------------------+
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// | PHP version 4.0 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1997, 1998, 1999 The PHP Group |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2.0 of the PHP license, |
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// | that is bundled with this package in the file LICENSE, and is |
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// | available at through the world-wide-web at |
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// | http://www.php.net/license/2_0.txt. |
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// | If you did not receive a copy of the PHP license and are unable to |
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// | obtain it through the world-wide-web, please send a note to |
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// | license@php.net so we can mail you a copy immediately. |
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// +----------------------------------------------------------------------+
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// | Authors: Stig Bakken <ssb@fast.no> |
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// | |
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// +----------------------------------------------------------------------+
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//
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// $Id$
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//
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// Database independent query interface.
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//
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// {{{ Database independent error codes.
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/*
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* The method mapErrorCode in each DB_dbtype implementation maps
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* native error codes to one of these.
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*
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* If you add an error code here, make sure you also add a textual
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* version of it in DB::errorMessage().
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*/
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define("DB_OK", 0);
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define("DB_ERROR", -1);
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define("DB_ERROR_SYNTAX", -2);
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define("DB_ERROR_CONSTRAINT", -3);
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define("DB_ERROR_NOT_FOUND", -4);
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define("DB_ERROR_ALREADY_EXISTS", -5);
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define("DB_ERROR_UNSUPPORTED", -6);
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define("DB_ERROR_MISMATCH", -7);
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define("DB_ERROR_INVALID", -8);
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define("DB_ERROR_NOT_CAPABLE", -9);
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define("DB_ERROR_TRUNCATED", -10);
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define("DB_ERROR_INVALID_NUMBER", -11);
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define("DB_ERROR_INVALID_DATE", -12);
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define("DB_ERROR_DIVZERO", -13);
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define("DB_ERROR_NODBSELECTED", -14);
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define("DB_ERROR_CANNOT_CREATE", -15);
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define("DB_ERROR_CANNOT_DELETE", -16);
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define("DB_ERROR_CANNOT_DROP", -17);
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define("DB_ERROR_NOSUCHTABLE", -18);
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define("DB_ERROR_NOSUCHFIELD", -19);
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// }}}
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// {{{ Prepare/execute parameter types
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/*
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* These constants are used when storing information about prepared
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* statements (using the "prepare" method in DB_dbtype).
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*
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* The prepare/execute model in DB is borrowed from the ODBC extension,
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* in a query the "?" character means a scalar parameter, and a "*"
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* character means an opaque parameter. An opaque parameter is simply
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* a file name, the real data are in that file (useful for large blob
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* operations).
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*/
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define("DB_PARAM_SCALAR", 1);
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define("DB_PARAM_OPAQUE", 2);
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// }}}
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// {{{ Binary data modes
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/*
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* These constants define different ways of returning binary data
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* from queries. Again, this model has been borrowed from the ODBC
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* extension.
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*
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* DB_BINMODE_PASSTHRU sends the data directly through to the browser
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* when data is fetched from the database.
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* DB_BINMODE_RETURN lets you return data as usual.
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* DB_BINMODE_CONVERT returns data as well, only it is converted to
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* hex format, for example the string "123" would become "313233".
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*/
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define("DB_BINMODE_PASSTHRU", 1);
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define("DB_BINMODE_RETURN", 2);
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define("DB_BINMODE_CONVERT", 3);
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// }}}
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/**
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* The main "DB" class is simply a container class with some static
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* methods for creating DB objects as well as some utility functions
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* common to all parts of DB.
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*
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* The object model of DB is as follows (indentation means inheritance):
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*
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* DB The main DB class. This is simply a utility class
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* with some "static" methods for creating DB objects as
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* well as common utility functions for other DB classes.
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*
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* DB_common The base for each DB implementation. Provides default
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* | implementations (some would say virtual methods) for
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* | the actual DB implementations as well as a bunch of
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* | query utility functions.
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* |
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* +-DB_mysql The DB implementation for MySQL. Inherits DB_common.
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* When calling DB::factory or DB::connect for MySQL
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* connections, the object returned is an instance of this
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* class.
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*
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* @version 1.00
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* @author Stig Bakken <ssb@fast.no>
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* @since PHP 4.0
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*/
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class DB {
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// {{{ factory()
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/**
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* Create a new DB object for the specified database type.
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*
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* @param $type database type
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*
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* @return object a newly created DB object, or a DB error code on
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* error
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*/
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function factory($type) {
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global $USED_PACKAGES;
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// "include" should be replaced with "use" once PHP gets it
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$pkgname = 'DB/' . $type;
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if (!is_array($USED_PACKAGES) || !$USED_PACKAGES[$pkgname]) {
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if (!@include("DB/${type}.php")) {
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return DB_ERROR_NOT_FOUND;
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} else {
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$USED_PACKAGES[$pkgname] = true;
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}
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}
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$classname = 'DB_' . $type;
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$obj = new $classname;
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return $obj;
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}
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// }}}
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// {{{ connect()
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/**
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* Create a new DB object and connect to the specified database.
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*
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* @param $dsn "data source name", see the parseDSN method for a
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* description of the dsn format.
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*
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* @param $persistent (optional) whether this connection should be
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* persistent. Ignored if the backend extension does not support
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* persistent connections.
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*
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* @return object a newly created DB object, or a DB error code on
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* error
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*/
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function connect($dsn, $persistent = false) {
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global $USED_PACKAGES;
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$dsninfo = DB::parseDSN($dsn);
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$type = $dsninfo['phptype'];
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// "include" should be replaced with "use" once PHP gets it
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$pkgname = 'DB/' . $type;
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if (!is_array($USED_PACKAGES) || !$USED_PACKAGES[$pkgname]) {
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if (!@include($pkgname . '.php')) {
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return DB_ERROR_NOT_FOUND;
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} else {
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$USED_PACKAGES[$pkgname] = true;
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}
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}
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$classname = 'DB_' . $type;
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$obj = new $classname;
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$err = $obj->connect(&$dsninfo, $persistent);
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if (DB::isError($err)) {
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return $err;
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}
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return $obj; // XXX ADDREF
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}
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// }}}
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// {{{ apiVersion()
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/**
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* Return the DB API version.
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*
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* @return double the DB API version number
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*/
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function apiVersion() {
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return 1.00;
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}
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// }}}
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// {{{ isError()
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/**
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* Tell whether a result code from a DB method is an error.
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*
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* @param $code result code
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*
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* @return bool whether $code is an error
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*/
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function isError($code) {
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return is_int($code) && ($code < 0);
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}
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// }}}
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// {{{ errorMessage()
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/**
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* Return a textual error message for a DB error code.
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*
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* @param $code error code
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*
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* @return string error message, or false if the error code was
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* not recognized
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*/
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function errorMessage($code) {
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if (!is_array($errorMessages)) {
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$errorMessages = array(
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DB_OK => "no error",
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DB_ERROR => "unknown error",
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DB_ERROR_SYNTAX => "syntax error",
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DB_ERROR_CONSTRAINT => "constraint violation",
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DB_ERROR_NOT_FOUND => "not found",
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DB_ERROR_ALREADY_EXISTS => "already exists",
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DB_ERROR_UNSUPPORTED => "not supported",
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DB_ERROR_MISMATCH => "mismatch",
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DB_ERROR_INVALID => "invalid",
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DB_ERROR_NOT_CAPABLE => "DB implementation not capable",
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DB_ERROR_INVALID_NUMBER => "invalid number",
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DB_ERROR_INVALID_DATE => "invalid date or time",
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DB_ERROR_DIVZERO => "division by zero",
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DB_ERROR_NODBSELECTED => "no database selected",
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DB_ERROR_CANNOT_CREATE => "can not create",
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DB_ERROR_CANNOT_DELETE => "can not delete",
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DB_ERROR_CANNOT_DROP => "can not drop",
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DB_ERROR_NOSUCHTABLE => "no such table",
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DB_ERROR_NOSUCHFIELD => "no such field"
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);
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}
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return $errorMessages[$code];
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}
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// }}}
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// {{{ parseDSN()
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/**
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* Parse a data source name and return an associative array with
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* the following keys:
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* phptype Database backend used in PHP (mysql, odbc etc.)
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* dbsyntax Database used with regards to SQL syntax etc.
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* protocol Communication protocol to use (tcp, unix etc.)
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* hostspec Host specification (hostname[:port])
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* database Database to use on the DBMS server
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* username User name for login
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* password Password for login
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*
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* The format of the supplied DSN is in its fullest form:
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* phptype(dbsyntax)://username:password@protocol+hostspec/database
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* Most variations are allowed:
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* phptype://username:password@protocol+hostspec/database
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* phptype://username:password@hostspec/database
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* phptype://username:password@hostspec
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* phptype://hostspec/database
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* phptype://hostspec
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* phptype(dbsyntax)
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* phptype
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*
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* FALSE is returned on error.
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*
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* @param $dsn Data Source Name to be parsed
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*/
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function parseDSN($dsn) {
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$parsed = array(
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'phptype' => false,
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'dbsyntax' => false,
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'protocol' => false,
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'hostspec' => false,
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'database' => false,
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'username' => false,
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'password' => false
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);
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if (preg_match('|^([^:]+)://|', $dsn, &$arr)) {
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$dbtype = $arr[1];
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$dsn = preg_replace('|^[^:]+://|', '', $dsn);
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// match "phptype(dbsyntax)"
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if (preg_match('|^([^\(]+)\((.+)\)$|', $dbtype, &$arr)) {
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$parsed['phptype'] = $arr[1];
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$parsed['dbsyntax'] = $arr[2];
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} else {
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$parsed['phptype'] = $dbtype;
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}
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} else {
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// match "phptype(dbsyntax)"
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if (preg_match('|^([^\(]+)\((.+)\)$|', $dsn, &$arr)) {
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$parsed['phptype'] = $arr[1];
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$parsed['dbsyntax'] = $arr[2];
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} else {
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$parsed['phptype'] = $dsn;
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}
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return $parsed; // XXX ADDREF
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}
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if (preg_match('|^(.*)/([^/]+)/?$|', $dsn, &$arr)) {
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$parsed['database'] = $arr[2];
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$dsn = $arr[1];
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}
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if (preg_match('|^([^:]+):([^@]+)@?(.*)$|', $dsn, &$arr)) {
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$parsed['username'] = $arr[1];
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$parsed['password'] = $arr[2];
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$dsn = $arr[3];
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} elseif (preg_match('|^([^:]+)@(.*)$|', $dsn, &$arr)) {
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$parsed['username'] = $arr[1];
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$dsn = $arr[3];
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}
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if (preg_match('|^([^\+]+)\+(.*)$|', $dsn, &$arr)) {
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$parsed['protocol'] = $arr[1];
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$dsn = $arr[2];
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}
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if (!$parsed['database'])
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$dsn = preg_replace('|/+$|', '', $dsn);
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$parsed['hostspec'] = $dsn;
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if (!$parsed['dbsyntax']) {
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$parsed['dbsyntax'] = $parsed['phptype'];
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}
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return $parsed; // XXX ADDREF
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}
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// }}}
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}
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/**
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* This class implements a wrapper for a DB result set.
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* A new instance of this class will be returned by the DB implementation
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* after processing a query that returns data.
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*/
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class DB_result {
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// {{{ properties
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var $dbh;
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var $result;
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// }}}
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// {{{ DB_result()
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/**
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* DB_result constructor.
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* @param $dbh DB object reference
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* @param $result result resource id
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*/
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function DB_result(&$dbh, $result) {
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$this->dbh = &$dbh;
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$this->result = $result;
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}
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// }}}
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// {{{ fetchRow()
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/**
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* Fetch and return a row of data.
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* @return array a row of data, or false on error
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*/
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function fetchRow() {
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return $this->dbh->fetchRow($this->result);
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}
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// }}}
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// {{{ fetchInto()
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/**
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* Fetch a row of data into an existing array.
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*
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* @param $arr reference to data array
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* @return int error code
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*/
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function fetchInto(&$arr) {
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return $this->dbh->fetchInto($this->result, &$arr);
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}
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// }}}
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// {{{ numCols()
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/**
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* Get the the number of columns in a result set.
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*
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* @return int the number of columns, or a DB error code
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*/
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function numCols() {
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return $this->dbh->numCols($this->result);
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}
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// }}}
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// {{{ free()
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/**
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* Frees the resources allocated for this result set.
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* @return int error code
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*/
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function free() {
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$err = $this->dbh->freeResult($this->result);
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if (DB::isError($err)) {
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return $err;
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}
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$this->dbh = $this->result = false;
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return true;
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}
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// }}}
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}
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// Local variables:
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// tab-width: 4
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// c-basic-offset: 4
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// End:
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?>
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