Basic usage: table join

Question

Hello,
First: I'm not an experienced Toplink user. We're using it in our project, but I think we're just using the most basic features. My portion of the project needs something slightly more sophisticated, and nobody here seems to know how it's done. So I turn to this forum for help.
The setup is fairly simple:
The "LOA" table has a "status" field, and bunch of other junk.
The "TACFC" table also has a "status" field, and a bunch of junk.
The "correlation" table has an OID, and the OID of an entry in table "LOA", and the OID of an entry in table "TACFC". It also has a few other bits of information about these correlations, such as dates, status, stuff like that.
In my Java code, I need to do a query, and get all correlation records where the correlated LOA (the one referred to by the LOA OID stored in the correlation record) has status == "A", and the correlated TACFC (identified by the TACFCOID in the correlation) has status == "A".
I'm pretty sure that toplink is correctly mapping the tables to objects, with the foreign keys, etc. It's just this expression that's giving me a headache.
Here's what I'm trying:
Expression exprPendingCorr = m_exprBuilder.get("correlationStatus").equal(globalProperties.CORRELATION_PENDING);
Expression exprCorrLOAAvailable = m_exprBuilder.anyOf("loa").get("status").equal(globalProperties.LOA_STATUS_AVAILABLE);
Expression exprCorrTACFCAvailable = m_exprBuilder.anyOf("tacfc").get("status").equal(globalProperties.TACFC_STATUS_AVAILABLE);
Expression exprCorrToActivate = exprPendingCorr.and(exprCorrLOAAvailable).and(exprCorrTACFCAvailable);
It builds just fine, but when I run it, I get:
EXCEPTION DESCRIPTION: Invalid use of anyOf() for a query key [oracle.toplink.mappings.OneToOneMapping[loa]] not representing a to-many relationship in an expression. Use get() rather than anyOf().
Now, I've been digging around in the documentation, reading about anyOf(), but I'm still stuck. Am I doing this the right way?
I'm going to post this now, and keep reading. I'm looking forward to any pointers, ridicule, or helpful suggestions on my problem.
Thanks! --- Eric

Answer 1

Hi,
why don't you use "get" as the error message suggests?
Expression exprCorrLOAAvailable = m_exprBuilder.get("loa").get("status").equal(globalProperties.LOA_STATUS_AVAILABLE);
Expression exprCorrTACFCAvailable = m_exprBuilder.get("tacfc").get("status").equal(globalProperties.TACFC_STATUS_AVAILABLE);
It seems correlation -> LOA is a OneToOneMapping. You only need anyOf for a OneToManyMapping