You must do it the other way around:
First, try update, then see how many records were updated, if there were 0
records updated, then do the insert.
Currently, plpgsql lacks decent exception handling.
Sample code:
create function ...
...
declare rec_affected int;
begin update ... get diagnostics rec_affected = ROW_COUNT; if rec_affected = 0 then insert ... end if;
end;
On Wed, 4 Jul 2001, [iso-8859-1] DI Hasen�hrl wrote:
> Hi,
>
> When I write in psql:
> testdb=# update table1 set tableattribute='any' where table_nr=1;
> if a tuple exists, I get this message
> testdb=# update 1
> if no tuple with table_nr=1 exists, I get this message
> testdb=# update 0
>
>
> Is there a possibility to make a difference in a pgsql function like this:
> create function updTable(text,integer) returns int AS
> 'DECLARE
> msg ALIAS FOR $1;
> nr ALIAS FOR $2;
> BEGIN
> update table1 set tableattribute=msg where table_nr=nr;
> --pseudocode
> if update = 0 then
> return 0;
> else
> return 1;
> end if;
> END;
> 'language 'plpgsql';
>
> or for a function, which inserts data:
> create function insTable(text,integer) returns int AS
> 'DECLARE
> msg ALIAS FOR $1;
> nr ALIAS FOR $2;
> BEGIN
> insert into table1 values (nr,msg);
> --pseudocode
> if error= cannot insert duplicate key.....then
> return 0;
> else
> return 1;
> end if;
> END;
> 'language 'plpgsql';
>
> I want to know the result of an insert or update, because I call these functions from an Access form and the next
stepsof the program depend on these results.
>
> I hope, someone can help me, because I didn't find anything in the docu or mailing list.
> Thanks in advance
> Irina
>
> E-Mail: i.hasenoehrl@aon.at
>