Question

我正在尝试使用以下代码生成BLOB数据（来自MySQL的GIF图像）。我收到'文字内容中发现了无效字符'。如果有任何建议，请告诉我吗？

$connection = mysql_connect( $db_host, $db_username, $db_password );

$result = mysql_query("SELECT * from files");
header("Content-Type: application/xml");

echo sqlToXml($result, "entries", "entry");

    function sqlToXml($queryResult, $rootElementName, $childElementName) {
        $w = new XMLWriter();
        $w->openMemory();
        $w->setIndent(true);
        // use tabs as indents
        $w->setIndentString("   ");
        $w->startDocument("1.0", 'UTF-8');
        $w->startElement($rootElementName);

        while($record = mysql_fetch_object($queryResult)) {
            $w->startElement($childElementName);
            for ($i = 0; $i < mysql_num_fields($queryResult); $i++) { 
                $fieldName = mysql_field_name($queryResult, $i); 
                $w->startElement($fieldName);
                if(!empty($record->$fieldName)) {
                      $w->writeCData(base64_encode($record->$fieldName));
                }
                else {
                    $w->writeCData("null");
                }
                $w->endElement(); // $fieldName
            } 


            $w->endElement();
            $w->endElement(); // $childElementName
        } 
        $w->endElement(); // $rootElementName
        $w->endDocument();
        return $w->outputMemory();
    }

Answer 1

你的内循环非常冗长。为什么不：

while($row = mysql_fetch_assoc($result)) {
   $w->startElement($childElementName);
   foreach($row as $key => $value) {
      $w->startElement($key);
      $w->writeCData(base64_encode($value));
   }
   $w->endElement();
}

另外，请注意empty()在这种情况下可能会很危险，尤其是如果您的数据自然可以包含整数0值之类的内容。 PHP中empty(0)为TRUE。

生成BLOB数据到XML

1 个答案: