Donald Fraser wrote:
Donald Fraser wrote:
Do you think in a later version you can show non-system constraint
triggers that have been created by the user via:
CREATE CONSTRAINT TRIGGER ?
Andreas Pflug wrote:
Definitively not. Creating constraint triggers directly is horribly
outdated (pre-7.3), and still available for backwards compatibility
only. Use contrib/adddepend to fix your database.
I'm not talking about old versions of PostgreSQL that have been upgraded to
later versions.
Prior to version 8.x.x all AFTER trigger events were deferred until the end
of all statements for the current transaction.
As of version 8.x.x AFTER trigger events occur after each statement in the
transaction - basically they are not deferred any more.
Unfortunately, for some of us, having deferred AFTER trigger events was a
nice feature.
There are some things you simply cannot do unless the trigger event is
deferred! I shouldn't need to qualify that statement, but the fact that
referential integrity requires them points out one example of when its nice
to have deferred trigger events.
Moving forward I am trying to upgrade a 7.4.x system to 8.0.x and I cannot
upgrade it without converting a lot of trigger functions from standard AFTER
trigger events to constraint trigger events, simply because I need them to
be deferred until the end of the transaction.
So after converting these "normal" trigger functions to "constraint" trigger
functions they disappear from view in pgAdmin...
They are not system generated trigger functions, they are not missing any
dependencies, they are there in that form because I need them to be there
and I created them using a PostgreSQL command "CREATE CONSTRAINT TRIGGER..."
I know that the documentation says "...It is not intended for general use."
Personally I don't see what's wrong with deferred trigger events, they are
useful, PostgreSQL already supports them, there is no other way of creating
deferred events yet!
I'm still disinclined to offer this to the normal pgadmin user.
constraint triggers are internal implementation details, subject to
change without prior notice blablabla. I didn't follow the deferred
constraint discussion back then, but I really wonder why there's no such
option for CREATE TRIGGER. How about contacting pgsql-hackers, maybe
this could go into 8.2.
Regards,
Andreas
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