SOAP服务通过WSDL而不是数据库中的数据返回空数组

I am trying to write my own SOAP server and to call methods via SoapClient(wsdl mode). I created methods in php, added an auto-generated wsdl file. I send request via SoapClient and server should work with Mysql and return results, but i am always getting empty response. I checked logs in MySQL and they show correct request that should return the data.I am trying to write my own SOAP server and to