Hi,
Is vertical inheritance not supported in Cayenne 3.0? According to the
documentation, vertical inheritance is supported, but I am running into
problems with the generated SELECT query when reading one of the subclasses:
The generated query is:
SELECT t0.DATA_COLLECTION_ID, t0.COLLECTION_TYPE_ID, t0.DATA_COLLECTION_ID,
t0.SCHOOL_YEAR, t0.SNAPSHOT_DATE FROM ESDM.K12_DATA_COLLECTION t0 JOIN
ESDM.DATA_COLLECTION t1 ON (t0.DATA_COLLECTION_ID = t1.DATA_COLLECTION_ID)
JOIN ESDM.DATA_COLLECTION_TYPE t2 ON (t1.COLLECTION_TYPE_ID =
t2.COLLECTION_TYPE_ID) WHERE t2.COLLECTION_TYPE_ID = ? [bind:
1->COLLECTION_TYPE_ID:3]
which is a problem because
1) column COLLECTION_TYPE_ID is in select list for the subclass
(K12_DATA_COLLECTION) but that column is in the super class table
(DATA_COLLECTION), not the subclass
2) DATA_COLLECTION_ID is in the K12_DATA_COLLECTION select list twice.
Do you have any suggestions, or is this functionality not yet supported?
thank you for any assistance you can give
Julie
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