It depends on the size of the table and the frequency of updates, deletes but cold consider an audit table with triggers for update, delete and truncate. At least you have a way to recover deleted records.
Ioana
On Fri, Sep 18, 2015 at 5:52 AM, Leif Jensen <leif@crysberg.dk> wrote:
Hello Laurenz,
Thank you for you suggestion. I really want to aviod that someone 'accidentally' deletes too much by typing (programming) a not full qualified DELETE ... statement. In your case one would have to always use the delete function, but no restrictions on using the DELETE statement.
Leif
----- Original Message ----- > Leif Jensen wrote: > > If I do "DELETE FROM devicegroup WHERE group=1" I do not want to delete > > anything. I only want to > > delete if I do "DELETE FROM devicegroup WHERE groupid=x AND ctrlid=y AND > > userid=z". I don't wanna let > > anyone delete more than 1 row at a time. > > I can't think of a way to do that with a trigger. > > I'd write a > FUNCTION delete_devicegroup(groupid integer, ctrlid integer, userid > integer) > RETURNS void CALLED ON NULL INPUT VOLATILE SECURITY DEFINER > that enables the user to delete a row and checks that all arguments > are NOT NULL. The user doesn't get privileges to DELETE from the table > directly. > > Yours, > Laurenz Albe > >