public void QueryCreatorTest()
{
var qc = QueryCreator.NewCreator().From("document")
.Join("document_attr", "document.did = document_attr.did")
.Join("document_content", "document.did = document_content.did")
.AddField("document", "*")
.AddField("document_attr", "*")
.AddField("document_attr", "*")
.AddWhere("document.did = 1");
var value = DbSession.Default.From(qc).ToTable();
}