Named SQL queries without a descriptor in the workbench

Question

Hi,
I want to call some named query SQLs from my DAO by using
result = (ResultSet)Session. executeQuery(String queryName, Vector paramList);
The way I have done it now in the mapping workbench I have defined all named queries and SQL with a class descriptor, even though that class doean't have any mappings. I couldn't find any other way of defining named query SQLs in mapping workbench, other than attaching to a class descriptor. But I think because I'm using this API of calling executeQuery instead of getting the domain class too..I'm running into the following exception -
Exception [TOPLINK-6026] (OracleAS TopLink - 10g (9.0.4.5) (Build 040930)): oracle.toplink.exceptions.QueryException
Exception Description: Query named [FIND_MUTUAL_FUND_SINGLE_SYMBOL] is not defined. Domain class: []
     at oracle.toplink.exceptions.QueryException.queryNotDefined(QueryException.java:587)
     at oracle.toplink.exceptions.QueryException.queryNotDefined(QueryException.java:580)
     at oracle.toplink.publicinterface.Session.executeQuery(Session.java:1020)
What is the proper way of defining a named query with our a descriptor in the workbench, so that I can use above mentioned API from my DAO? Any where in the doc? Is it Session events?
Any sort of sample example would be deeply appreciated.

Answer 1

To execute a named query for a paticular class/descriptor you need to call the Session.executeQuery(String queryName, Class descriptorClass, ...) API. The API that does not take a class is only for session-level named queries.
i.e.
List employees = (List) session.executeQuery("findAll", Employee.class);
Currently the Mapping Workbench does not support defining session-level queries, so if you wish to define queries not related to any descriptor, you need to define these through code (if you are using a sessions.xml to define your session, you can add the queries through a SessionCustomizer (10.1.3), or use a SessionEventListener and the preLogin event (9.0.4)).
You can execute named queries on any Session class (ClientSession, UnitOfWork, DatabaseSession, SessionBroker). But you need to define the queries in the ServerSession or DatabaseSession before login.
i.e.
ReadAllQuery query = new ReadAllQuery(Employee.class);
serverSession.addQuery("findAllEmployees", query);
List employees = (List) clientSession.executeQuery("findAllEmployees");