Re: User defined exceptions

On 15.07.2015 17:10, Alex Ignatov wrote:
> Hello all!
> Trying to emulate "named" user defined exception with:
> CREATE OR REPLACE FUNCTION exception_aaa () RETURNS text AS $body$
> BEGIN
> return 31234;
> END;
> $body$
> LANGUAGE PLPGSQL
> SECURITY DEFINER
> ;
>
> do $$
> begin
> raise exception using errcode=exception_aaa();
> exception
> when sqlstate exception_aaa()
> then
> raise notice 'got exception %',sqlstate;
> end;
> $$
>
> Got:
>
> ERROR: syntax error at or near "exception_aaa"
> LINE 20: sqlstate exception_aaa()
>
> I looks like "when sqlstate exception_aaa()" doesn't work.
>
> How can I catch exception in this case?

Hello Alex,

The following workaround could be used:

do $$
begin
raise exception using errcode = exception_aaa();
exception
when others then
if sqlstate = exception_aaa() then
raise notice 'got exception %',sqlstate;
else
raise; --reraise
end if;
end;
$$

Not sure if its performance is the same as in simple exception catch,
maybe it would degrade.

Best Regards,
Alexey Bashtanov