Question

我正在尝试从我的数据库中获取数据并将其存储在xml文件中，每次运行代码时，我都会在第1行的第2行得到此错误：文档为空。

 <?php 
    header ("Content-Type:text/xml");//Tell browser to expect xml
    include ("db_connect.php");
    $query = "SELECT * FROM winery"; 
    $result = mysqli_query($connection, $query) or die ("Error in query: $query. ".mysql_error()); 
    //Top of xml file
    $_xml = '<?xml version="1.0"?>'; 
    $_xml .="<winerys>"; 
    while($row = mysqli_fetch_array($result)) { 
    $_xml .="<winery>"; 
    $_xml .="<winery_id>".$row['winery_id']."</winery_id>"; 
    $_xml .="<winery_name>".$row['winery_name']."</winery_name>"; 
    $_xml .="<region_id>".$row['region_id']."</region_id>"; 
    $_xml .="</winery>"; 
    } 
    $_xml .="</winerys>"; 
    //Parse and create an xml object using the string
    $xmlobj=new SimpleXMLElement($_xml);
    //And output
    print $xmlobj->asXML();
    //or we could write to a file
    $xmlobj->asXML(winerys.xml);
    ?>

Answer 1

假设您正在获取记录集，则以下内容应该可以正常工作，尽管它未经测试。它使用标准DOMDocument方法生成xml，而不是使用SimpleXMLElement构建为字符串。它可能不一定像javascript一样真实，但字符串连接有时可能很慢，特别是如果字符串由于大量记录而变得非常大。此外，您的原始代码需要注意的一件事是用于保存xml数据的文件名 - 它显示为不带引号的字符串，因此可能被错误地解释为常量。

 <?php 
    error_reporting( E_ALL );/* to aid debugging */
    include ("db_connect.php");

    $query = "select * from `winery`;"; 
    $result = mysqli_query( $connection, $query ) or die ('Sorry, there was an error'); 
    /* Create the DOM object */
    $dom=new DOMDocument('1.0','utf-8');
    /* Add the root node */
    $root=$dom->createElement('winerys');
    $dom->appendChild( $root );

    while( $row = mysqli_fetch_array( $result ) ) {
        /* Add a new item / child */
        $child=$root->appendChild( $dom->createElement('winery') );
        $child->appendChild( $dom->createElement( 'winery_id', $rs->winery_id ) );

        /* Use a CDATA section to allow for odd chars */
        $name=$dom->createCDATASection( $rs->winery_name );
        $winery=$dom->createElement( 'winery_name' );
        $winery->appendChild( $name );
        $child->appendChild( $winery );

        $child->appendChild( $dom->createElement( 'region_id', $rs->region_id ) );
    }

    /* save and echo */
    $xml = $dom->saveXML();
    $file = $dom->save('winerys.xml');

    header("Content-Type: text/xml");
    print_r( $xml );

?>

创建了一个测试数据库表，这似乎按预期工作。

第1行第2行的xml错误：文档为空

1 个答案: