Re: [HACKERS] plpgsql strangeness with select into <variable>

Reinoud,

First, I'm moving your question to PGSQL-SQL, which is the appropriate list,
not HACKERS. See my response at the bottom of your quote.

> I'm debugging a trigger in plpgsql and for some reason or the "select
> into <var>" does not seem to work. Here is an unaltered snippet of my
> trigger code:
>
> raise notice ''this id : %'',NEW.id;
>
> select into i_hierarchy_id
> hierarchy_id
> from link_def LD,
> link L,
> object_link OL
> where OL.id = NEW.id
> and L.id = OL.link_id
> and LD.id = L.link_def_id;
>
> raise notice ''i_hierarchy_id: %'',i_hierarchy_id;
>
>
> in the log this results in:
>
> NOTICE: this id : 5265
> NOTICE: i_hierarchy_id: <NULL>
>
> but when I perform the query on the command line I do get a result:
>
> select hierarchy_id
> from link_def LD,
> link L,
> object_link OL
> where OL.id = 5264
> and L.id = OL.link_id
> and LD.id = L.link_def_id;
>
> hierarchy_id
> --------------
> 1
> (1 row)
>
> i_hierarchy_id is declared as integer and is not used before this code nor
> as a column name anywhere.
>
> Does anyone have a clue what is going wrong? I use Postgresql 7.3.3 on
> FreeBSD 4.5.

Without seeing your full trigger code, I can't tell for sure. However, I
would guess that your "SELECT INTO" statement is querying data that has not
yet been created; it's an FK record waiting on a deferred trigger, or you're
using a BEFORE trigger and querying the record which has not yet been
committed.

--
Josh Berkus
Aglio Database Solutions
San Francisco