How to build a query to join on two tables without mapping

Question

I did Automatic mapping by the workbench Directofield mapping with the table and java object.
Wanted to build a simple join query by joining on the same field on both the tables.Not the sql query through the toplink using expression builder.
Please help.............
Spent one full day for this................

Answer 1

Thanks Don for the reply,sorry to bug you,but i need help.....
SELECT A.AGNCY_C,
     A.TYPE_C,
     A.RESN_C,
     A.S_TYPE_C,
     A.SUB_ID_C,
     A.RY_C
FROM RATING A, REF B
WHERE A.ID_C = B._ID_C
AND A.ALPHA_C = B.ALPHA_C
AND A.EFF_D >= B.MATURITY_D
This is the real query i was talking about.I did mapping automatically through the workbench,generated java classes also throught the workbench.
Now they don't want to execute the raw sql.They wanted to get all the RATING objects with the where condition.
So how to build a query by using toplink.
tried your example
ExpressionBuilder builder = new ExpressionBuilder();
Expression creditRating = builder.getTable("RATING").getField("ID_C");
Expression issue_ref = builder.getTable("REF").getField("ID_C");
Expression join = creditRating.equal(issue_ref);
I am getting java.lang.OutOfMemoryError
error.
I selected the option generate classes and descriptors
from the tables (RATING,REF).,so it created the classes and dscriptors automatically.
In Database script for the table RATING like this
ALTER TABLE RATING ADD (
CONSTRAINT RATING_F1 FOREIGN KEY (ID_C, ALPHA_C)
REFERENCES REF (ID_C,ALPHA_C));
I think when i generate descriptor automatically it is keeping this association.
Please help me.........