How to do a simple sql select?

Hello,

I am new to smartgwt and just evaluate the framework. I have big problems with datasource. I use jpa2 and want to try it with smartgwt. I created the .ds.xml file and do a

DataSource userDS = DataSource.get("user_DataSource");

But how can I do a simple

UserObject = select * from user where userid = 1

as an example. Your showcase shows how to bind to components but this I dont need here.

It must be simple I guess (hope) but couldnt find a sample. Can I use NamedQuery from my entity object?

Thx for any advice
Hans