把从SQL中取出的数据转化成XMl格式

使用了php的PEAR和DB
<?php
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// | PHP version 4.0                                                      
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// | Copyright (c) 1997, 1998, 1999, 2000, 2001 The PHP Group             
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// | This source file is subject to version 2.0 of the PHP license,       
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|// +----------------------------------------------------------------------+
// | Authors: Christian Stocker <[email protected]>                         
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//
// $Id: sql2xml.php,v 1.59 2001/11/13 10:54:02 chregu Exp $

/**
* This class takes a PEAR::DB-Result Object, a sql-query-string or an array
*  and returns a xml-representation of it.
*
* TODO
*   -encoding etc, options for header
*   -ERROR CHECKING
*
* Usage example
*
* include_once ("DB.php");
* include_once("XML/sql2xml.php");
* $db = DB::connect("mysql://root@localhost/xmltest");
* $sql2xml = new xml_sql2xml();
* //the next one is only needed, if you need others than the default
* $sql2xml->setEncoding("ISO-8859-1","UTF-8");
* $result = $db->query("select * from bands");
* $xmlstring = $sql2xml->getXML($result);
*
* or
*
* include_once ("DB.php");
* include_once("XML/sql2xml.php");
* $sql2xml = new xml_sql2xml("mysql://root@localhost/xmltest");
* $sql2xml->Add("select * from bands");
* $xmlstring = $sql2xml->getXML();
*
* More documentation and a tutorial/how-to can be found at
*   http://php.chregu.tv/sql2xml
*
* @author   Christian Stocker <[email protected]>
* @version  $Id: sql2xml.php,v 1.59 2001/11/13 10:54:02 chregu Exp $
* @package  XML
*/
class XML_sql2xml {

/**
* If joined-tables should be output nested.
*  Means, if you have joined two or more queries, the later
*   specified tables will be nested within the result of the former
*   table.
*   Works at the moment only with mysql automagically. For other RDBMS
*   you have to provide your table-relations by hand (see user_tableinfo)
*
* @var  boolean
* @see  $user_tableinfo, doSql2Xml(), doArray2Xml();
*/
var $nested = True;

/**
* Name of the tag element for resultsets
*
* @var  string
* @see  insertNewResult()
*/
var $tagNameResult = "result";

/**
* Name of the tag element for rows
*
* @var  string
* @see  insertNewRow()
*/
var $tagNameRow = "row";

/**
*
* @var   object PEAR::DB
* @access private
*/
var $db = Null;

/**
* Options to be used in extended Classes (for example in sql2xml_ext).
* They are passed with SetOptions as an array (arrary("user_options" = array());
*  and can then be accessed with $this->user_options["bla"] from your
*  extended classes for additional features.
*  This array is not use in this base class, it's only for passing easy parameters
*  to extended classes.
*
* @var      array
*/
var $user_options = array();

/**
* The DomDocument Object to be used in the whole class
*
* @var      object  DomDocument
* @access    private
*/
var $xmldoc;

/**
* The Root of the domxml object
* I'm not sure, if we need this as a class variable....
* could be replaced by domxml_root($this->xmldoc);
*
* @var      object DomNode
* @access    private
*/
var $xmlroot;

/**
* This array is used to give the structure of your database to the class.
*  It's especially useful, if you don't use mysql, since other RDBMS than
*  mysql are not able at the moment to provide the right information about
*  your database structure within the query. And if you have more than 2
*  tables joined in the sql it's also not possible for mysql to find out
*  your real relations.
*  The parameters are the same as in fieldInfo from the PEAR::DB and some
*   additional ones. Here they come:
*  From PEAR::DB->fieldinfo:
*
*    $tableInfo[$i]["table"]    : the table, which field #$i belongs to.
*           for some rdbms/comples queries and with arrays, it's impossible
*           to find out to which table the field actually belongs. You can
*           specify it here more accurate. Or if you want, that one fields
*           belongs to another table, than it actually says (yes, there's
*           use for that, see the upcoming tutorial ...)
*
*    $tableInfo[$i]["name"]     : the name of field #$i. if you want another
*           name for the tag, than the query or your array provides, assign
*           it here.
*
*   Additional info
*     $tableInfo["parent_key"][$table]  : index of the parent key for $table.
*           this is the field, where the programm looks for changes, if this
*           field changes, it assumes, that we need a new "rowset" in the
*           parent table.
*
*     $tableInfo["parent_table"][$table]: name of the parent table for $table.
*
* @var      array
* @access    private
*/
var $user_tableInfo = array();

/**
* the encoding type, the input from the db has
*/
var $encoding_from  = "ISO-8859-1";

/**
* the encoding type, the output in the xml should have
* (note that domxml at the moment only support UTF-8, or at least it looks like)
*/
var $encoding_to = "gb2312";

var $tagname = "tagname";

/**
* Constructor
* The Constructor can take a Pear::DB "data source name" (eg.
*  "mysql://user:passwd@localhost/dbname") and will then connect
*  to the DB, or a PEAR::DB object link, if you already connected
*  the db before.
"  If you provide nothing as $dsn, you only can later add stuff with
*   a pear::db-resultset or as an array. providing sql-strings will
*   not work.
* the $root param is used, if you want to provide another name for your
*  root-tag than "root". if you give an empty string (""), there will be no
*  root element created here, but only when you add a resultset/array/sql-string.
*  And the first tag of this result is used as the root tag.
*
* @param  mixed $dsn    PEAR::DB "data source name" or object DB object
* @param  string $root  the name of the xml-doc root element.
* @access   public
*/
function XML_sql2xml ($dsn = Null, $root = "root") {

// if it's a string, then it must be a dsn-identifier;

if (is_string($dsn))
{
include_once ("DB.php");
$this->db = DB::Connect($dsn);
if (DB::isError($this->db))
{
print "The given dsn for XML_sql2xml was not valid in file ".__FILE__." at line ".__LINE__."<br>n";
return new DB_Error($this->db->code,PEAR_ERROR_DIE);
}

}

elseif (is_object($dsn) && DB::isError($dsn))
{
print "The given param for XML_sql2xml was not valid in file ".__FILE__." at line ".__LINE__."<br>n";
return new DB_Error($dsn->code,PEAR_ERROR_DIE);
}

// if parent class is db_common, then it's already a connected identifier
elseif (get_parent_class($dsn) == "db_common")
{
$this->db = $dsn;
}

$this->xmldoc = domxml_new_xmldoc('1.0');

//oehm, seems not to work, unfortunately.... does anybody know a solution?
$this->xmldoc->encoding = $this->encoding_to;        

if ($root) {
$this->xmlroot = $this->xmldoc->add_root($root);
//PHP 4.0.6 had $root->name as tagname, check for that here...
if (!isset($this->xmlroot->{$this->tagname}))
{
$this->tagname = "name";
}
}

}

/**
* General method for adding new resultsets to the xml-object
*  Give a sql-query-string, a pear::db_result object or an array as
*  input parameter, and the method calls the appropriate method for this
*  input and adds this to $this->xmldoc
*
* @param    string sql-string, or object db_result, or array
* @param    mixed additional parameters for the following functions
* @access   public
* @see      addResult(), addSql(), addArray(), addXmlFile()
*/
function add ($resultset, $params = Null)
{

// if string, then it's a query, a xml-file or a xml-string...
if (is_string($resultset)) {
if (preg_match("/.xml$/",$resultset)) {
$this->AddXmlFile($resultset,$params);
}
elseif (preg_match("/.*select.*from.*/i" ,  $resultset)) {
$this->AddSql($resultset);
}
else {
$this->AddXmlString($resultset);
}

}
// if array, then it's an array...
elseif (is_array($resultset)) {
$this->AddArray($resultset);
}

if (get_class($resultset) == "db_result") {
$this->AddResult($resultset);
}
}

/**
* Adds the content of a xml-file to $this->xmldoc, on the same level
* as a normal resultset (mostly just below <root>)
*
* @param    string filename
* @param    mixed xpath  either a string with the xpath expression or an array with "xpath"=>xpath expression  and "root"=tag/subtag/etc, which are the tags to be inserted before the result
* @access   public
* @see      doXmlString2Xml()
*/

function addXmlFile($file,$xpath = Null)
{
$fd = fopen( $file, "r" );
$content = fread( $fd, filesize( $file ) );
fclose( $fd );
$this->doXmlString2Xml($content,$xpath);
}

/**
* Adds the content of a xml-string to $this->xmldoc, on the same level
* as a normal resultset (mostly just below <root>)
*
* @param    string xml
* @param    mixed xpath  either a string with the xpath expression or an array with "xpath"=>xpath expression  and "root"=tag/subtag/etc, which are the tags to be inserted before the result
* @access   public
* @see      doXmlString2Xml()
*/
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