I used an Oracle query hint as described in the OpenJPA documentation:
final Query query = em.createQuery("SELECT b FROM Bp b");
query.setHint("openjpa.hint.OracleSelectHint", new Integer(2000));
final List<Bp> result = query.getResultList();
Executing this query fails with
"org.apache.openjpa.lib.jdbc.ReportingSQLException: ORA-00923: FROM keyword
not found where expected (java.sql.SQLSyntaxErrorException: ORA-00923: FROM
keyword not found where expected)".
This is the generated query: SELECT 2000 t0.ID [some other attributes left
out here] FROM BP t0
Why is OpenJPA generating wrong SQL statements?
I also tried to set the query hint in a named query:
<named-query name="FIND_ALL_BP">
<query></query>
<hint name="openjpa.hint.OptimizeResultCount" value="2000"/>
</named-query>
final Query namedQuery =
em.createNamedQuery(MyQueryNames.FIND_ALL_BP.name());
final List<Bp> result = namedQuery.getResultList();
This query was executed but it did not show any hint. It simply was "SELECT
b FROM Bp b" so I guess the hint was just ignored because the SELECT did not
perform any faster.
Any suggestions on how to successfully use query hints?
I'm using Oracle 11g and OpenJPA 1.2.3.
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