Now I discovered a new problem in IBO5.9 that did not come up in 4,8.

When I want to check if a column does exist in a TIB_Query, i used to call:

if assigned (IB_Query.fieldbyname (fieldname)) then

   .......

Now in v5.9 that raises an exception.

I expect it to just return nil.

I digged into the code using the debugger and found in the method TIB_Row.GetByName in IB_Components that there is a difference to the same method IBO4.8 that causes that problem.

Close to the end of the method there is now

    if ( not Result ) and ( AFieldName <> '' ) and

       ( UseSQLNameUnqualifiedInByNameLookup ) then