Re: Bit by "commands ignored until end of transaction block" again

* Glenn Maynard (glenn(at)zewt(dot)org) wrote:
> > The ORM can't control transactions, can't call functions or can't set
> > savepoints?
>
> It can't write the necessary SQL to say "insert this unless it already
> exists", namely:

If it can't cleanly handle failure cases like this one, then I think
your issue is with your ORM and not with PG. An INSERT failing on a
uniqueness violation is actually a rather big deal in a relational
database and not erroring on it goes quite against data integrity
considerations.

If your ORM could call a function instead, you could handle the insert
and error-check in the function, to make up for the lack of intelligence
in the ORM. Another option would be to have a 'fake' table, which has
no rows in it and just has an 'ON INSERT' trigger that calls a function
to handle this. That could also be a view with a do-instead rule, if
the ORM has to query the same table.

I would think the time would better be spent fixing the ORM though.

Thanks,

Stephen