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Thank you for your example.
I understand, in order to avoid inserting
*duplicate keys*, first I try to update, when it fails make an insert. But other
errors may occur, is there a possibility to distinguish between errors by an
error-number.
Please can you tell me, where I can find system
functions, variables like *diagnostics, row_count, found, and so
on.....*
Many thanks in advance
Irina
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 Hasenöhrl 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 steps of 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: [EMAIL PROTECTED]
>
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