Support for Statement.getGeneratedKeys for Identity - Oracle platform

[rfelcman]

Based on #1480 there should be another fix/improvement implemented. Line 1607 statement = nativeConnection.prepareStatement(call.getSQLString(), Statement.RETURN_GENERATED_KEYS); in org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor should contain instead of Statement.RETURN_GENERATED_KEYS an array of column names indicating the columns that should be returned from the inserted row or rows. Something like nativeConnection.prepareStatement(call.getSQLString(), new String[] {"ID"}); (this is just for example - list of the DB columns is hardcoded). What should be tricky there is pass information about columns to the DatabaseAccessor level. Oracle DB/JDBC driver return for ...prepareStatement(call.getSQLString(), Statement.RETURN_GENERATED_KEYS)... ROWID instead of primary key(s).