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547 lines
16 KiB
PHP
547 lines
16 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, 2000 The PHP Group |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2.02 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_02.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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require_once "PEAR.php";
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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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define("DB_ERROR_NEED_MORE_DATA", -20);
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define("DB_ERROR_NOT_LOCKED", -21);
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define("DB_ERROR_VALUE_COUNT_ON_ROW", -22);
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/*
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* Warnings are not detected as errors by DB::isError(), and are not
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* fatal. You can detect whether an error is in fact a warning with
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* DB::isWarning().
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*/
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define("DB_WARNING", -1000);
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define("DB_WARNING_READ_ONLY", -1001);
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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 mostly borrowed from the ODBC
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* extension, in a query the "?" character means a scalar parameter.
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* There is one extension though, a "*" character means an opaque
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* parameter. An opaque parameter is simply a file name, the real
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* data are in that file (useful for stuff like putting uploaded files
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* into your database).
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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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* 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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* This is a special constant that tells DB the user hasn't specified
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* any particular get mode, so the default should be used.
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*/
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define("DB_FETCHMODE_DEFAULT", 0);
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/**
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* Column data indexed by numbers, ordered from 0 and up
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*/
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define("DB_FETCHMODE_ORDERED", 1);
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/**
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* Column data indexed by column names
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*/
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define("DB_FETCHMODE_ASSOC", 2);
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/**
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* For multi-dimensional results: normally the first level of arrays
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* is the row number, and the second level indexed by column number or name.
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* DB_FETCHMODE_FLIPPED switches this order, so the first level of arrays
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* is the column name, and the second level the row number.
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*/
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define("DB_FETCHMODE_FLIPPED", 4);
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/* for compatibility */
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define("DB_GETMODE_ORDERED", DB_FETCHMODE_ORDERED);
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define("DB_GETMODE_ASSOC", DB_FETCHMODE_ASSOC);
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define("DB_GETMODE_FLIPPED", DB_FETCHMODE_FLIPPED);
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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 (in OO lingo 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 2
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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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{
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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 $type string database type, for example "mysql"
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*
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* @return object a newly created DB object, or a DB error code on
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* error
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*/
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function &factory($type)
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{
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@include_once("DB/${type}.php");
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$classname = "DB_" . $type;
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$obj = @new $classname;
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if (!$obj) {
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return new DB_Error(DB_ERROR_NOT_FOUND);
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}
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return $obj;
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}
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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 mixed "data source name", see the DB::parseDSN
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* method for a description of the dsn format. Can also be
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* specified as an array of the format returned by DB::parseDSN.
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*
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* @param $persistent bool whether this connection should be
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* persistent. Ignored if the backend extension does not support
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* persistent connections.
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*
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* @return object a newly created DB object, or a DB error code on
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* error
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*
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* @see DB::parseDSN
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*/
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function &connect($dsn, $persistent = false)
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{
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if (is_array($dsn)) {
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$dsninfo = $dsn;
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} else {
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$dsninfo = DB::parseDSN($dsn);
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}
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$type = $dsninfo["phptype"];
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$classname = "DB_" . $type;
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@include_once("DB/${type}.php");
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$obj = @new $classname;
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if (!$obj) {
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return new DB_Error(DB_ERROR_NOT_FOUND);
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}
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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;
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}
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/**
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* Return the DB API version
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*
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* @return int the DB API version number
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*/
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function apiVersion()
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{
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return 2;
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}
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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 $value int result code
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*
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* @return bool whether $value is an error
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*/
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function isError($value)
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{
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return is_object($value) &&
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(get_class($value) == "db_error" ||
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is_subclass_of($value, "db_error"));
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}
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/**
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* Tell whether a result code from a DB method is a warning.
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* Warnings differ from errors in that they are generated by DB,
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* and are not fatal.
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*
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* @param $value mixed result value
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*
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* @return bool whether $value is a warning
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*/
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function isWarning($value)
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{
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return is_object($value) &&
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(get_class( $value ) == "db_warning" ||
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is_subclass_of($value, "db_warning"));
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}
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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 $value int error code
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*
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* @return string error message, or false if the error code was
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* not recognized
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*/
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function errorMessage($value)
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{
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if (!isset($errorMessages)) {
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$errorMessages = array(
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DB_ERROR => "unknown error",
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DB_ERROR_ALREADY_EXISTS => "already exists",
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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_CONSTRAINT => "constraint violation",
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DB_ERROR_DIVZERO => "division by zero",
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DB_ERROR_INVALID => "invalid",
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DB_ERROR_INVALID_DATE => "invalid date or time",
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DB_ERROR_INVALID_NUMBER => "invalid number",
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DB_ERROR_MISMATCH => "mismatch",
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DB_ERROR_NODBSELECTED => "no database selected",
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DB_ERROR_NOSUCHFIELD => "no such field",
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DB_ERROR_NOSUCHTABLE => "no such table",
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DB_ERROR_NOT_CAPABLE => "DB backend not capable",
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DB_ERROR_NOT_FOUND => "not found",
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DB_ERROR_NOT_LOCKED => "not locked",
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DB_ERROR_SYNTAX => "syntax error",
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DB_ERROR_UNSUPPORTED => "not supported",
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DB_ERROR_VALUE_COUNT_ON_ROW => "value count on row",
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DB_OK => "no error",
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DB_WARNING => "unknown warning",
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DB_WARNING_READ_ONLY => "read only"
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);
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}
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if (DB::isError($value)) {
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$value = $value->code;
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}
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return $errorMessages[$value];
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}
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/**
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* Parse a data source name
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*
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* @param $dsn string Data Source Name to be parsed
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*
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* @return array an associative array with the following keys:
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*
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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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*
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* phptype(dbsyntax)://username:password@protocol+hostspec/database
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*
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* Most variations are allowed:
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* phptype://username:password@protocol+hostspec/database</li>
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* phptype://username:password@hostspec/database</li>
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* phptype://username:password@hostspec</li>
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* phptype://hostspec/database</li>
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* phptype://hostspec</li>
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* phptype(dbsyntax)</li>
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* phptype</li>
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*
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* @return bool FALSE is returned on error
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*/
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function parseDSN($dsn)
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{
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if (is_array($dsn)) {
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return $dsn;
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}
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$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 $parsed;
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}
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if (preg_match("|^(.*)/([^/]+)/?$|", $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 = $arr[2];
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}
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if (preg_match("|^([^\+]+)\+(.*)$|", $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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$dsn = preg_replace("|/+$|", "", $dsn);
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}
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$parsed["hostspec"] = urldecode($dsn);
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if(!$parsed["dbsyntax"]) {
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$parsed["dbsyntax"] = $parsed["phptype"];
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}
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return $parsed;
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}
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}
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/**
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* DB_Error implements a class for reporting portable database error
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* messages.
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*
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* @author Stig Bakken <ssb@fast.no>
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*/
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class DB_Error extends PEAR_Error
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{
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/**
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* DB_Error constructor.
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*
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* @param $code mixed DB error code, or string with error message.
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* @param $mode int what "error mode" to operate in
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* @param $level what error level to use for $mode & PEAR_ERROR_TRIGGER
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* @param $debuginfo additional debug info, such as the last query
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*
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* @access public
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*
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* @see PEAR_Error
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*/
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function DB_Error($code = DB_ERROR, $mode = PEAR_ERROR_RETURN,
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$level = E_USER_NOTICE, $debuginfo = null) {
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if (is_int($code)) {
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$this->PEAR_Error("DB Error: " . DB::errorMessage( $code ), $code, $mode, $level, $debuginfo);
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} else {
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$this->PEAR_Error("DB Error: $code", 0, $mode, $level, $debuginfo);
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}
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}
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}
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/**
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* DB_Warning implements a class for reporting portable database
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* warning messages.
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*
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* @author Stig Bakken <ssb@fast.no>
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*/
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class DB_Warning extends PEAR_Error
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{
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/**
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* DB_Warning constructor.
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*
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* @param $code mixed DB error code, or string with error message.
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* @param $mode int what "error mode" to operate in
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* @param $level what error level to use for $mode == PEAR_ERROR_TRIGGER
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* @param $debuginfo additional debug info, such as the last query
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*
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* @access public
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*
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* @see PEAR_Error
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*/
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function DB_Warning($code = DB_WARNING, $mode = PEAR_ERROR_RETURN,
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$level = E_USER_NOTICE, $debuginfo = null) {
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if (is_int($code)) {
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$this->PEAR_Error("DB Warning: " . DB::errorMessage( $code ), $code, $mode, $level, $debuginfo);
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} else {
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$this->PEAR_Error("DB Warning: $code", 0, $mode, $level, $debuginfo);
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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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* @author Stig Bakken <ssb@fast.no>
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*/
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class DB_result
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{
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var $dbh;
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var $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 = $result;
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}
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/**
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* Fetch and return a row of data.
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* @return array a row of data, or false on error
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*/
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function fetchRow($fetchmode = DB_FETCHMODE_DEFAULT) {
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if ($fetchmode == DB_FETCHMODE_DEFAULT) {
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$fetchmode = $this->dbh->fetchmode;
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}
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return $this->dbh->fetchRow($this->result, $fetchmode);
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}
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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, $fetchmode = DB_FETCHMODE_DEFAULT) {
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if ($fetchmode == DB_FETCHMODE_DEFAULT) {
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$fetchmode = $this->dbh->fetchmode;
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}
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return $this->dbh->fetchInto($this->result, $arr, $fetchmode);
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}
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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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*/
|
|
function numCols() {
|
|
return $this->dbh->numCols($this->result);
|
|
}
|
|
|
|
/**
|
|
* Frees the resources allocated for this result set.
|
|
* @return int error code
|
|
*/
|
|
function free() {
|
|
$err = $this->dbh->freeResult($this->result);
|
|
if( DB::isError($err)) {
|
|
return $err;
|
|
}
|
|
$this->result = false;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
?>
|