BC4J FOR UPDATE problem

Question

I created bc4j entity and view based on DB View with INSTEAD OF trigger. When I try to delete some rows from bc4j view I gut a mssg:
(java.sql.SQLException) ORA-02014: cannot select FOR UPDATE from view with DISTINCT, GROUP BY, etc.
How to make bc4j to do nothing and to pass control to view's INSTEAD OF trigger?
Thanks

Answer 1

I had the same problem using INSTEAD OF in combination with VPD. When i remember correctly, for views without VPD, the FOR UPDATE NOWAIT works.
You can overwrite the lock() method in your EntityImpl and lock the tables manually like this:try {
  getDBTransaction(  ).executeCommand( "declare v_my_table_id integer; begin "
                         + "SELECT my_table_id INTO v_my_table_id FROM mytable "
                         + "WHERE my_table_id = "
                         + getMyTableId(  )
                         + " FOR UPDATE NOWAIT; END;" );
  setLocked( true );
} catch( RuntimeException exception ) {
    throw exception;
}Sadly there is no SAVEPOINT support in BC4J, so if you have more than one table, better create a DB Package function that issues a savepoint, try to lock each of the tables and do a ROLLBACK TO savepoint if one of the SELECT FOR UPDATE fails.
hth, Markus