Re: How to trap invalid enum input exception?

I've trimmed my example down to the bare minimum in hopes of solving the problem myself, but no luck. Here's the exact code and console session:

create type side as enum ('right', 'left');

create or replace function testinput(
p_units_align side
) returns void as
$$
begin
exception
when SQLSTATE '22P02' then
raise 'Got it';
when INVALID_TEXT_REPRESENTATION then
raise 'Got it';
when OTHERS then
raise 'Got it';
end
$$
language plpgsql;

Then, in the psql console:
contracts=# \i testinput.sql
CREATE FUNCTION
contracts=# select * from testinput('right');
testinput
-----------

(1 row)

contracts=# select * from testinput('blue');
ERROR: 22P02: invalid input value for enum side: "blue"
LINE 1: select * from testinput('blue');
^
LOCATION: enum_in, enum.c:57

What am I missing?

- Leon

On Aug 15, 2010, at 8:58 PM, Tom Lane wrote:

> Leon Starr <leon_starr(at)modelint(dot)com> writes:
>> I have tried catching following with no success:
>> INVALID_TEXT_REPRESENTATION
>> SQLSTATE '22P02'
>> SQLSTATE '22000'
>> DATA_EXCEPTION
>> OTHERS
>
>> (lest we think I am completely incompetent ;), I have had success
>> catching all manner of FOREIGN_KEY_VIOLATION, UNIQUE_VIOLATION, CHECK_VIOLATION, NO_DATA_FOUND, etc. in other functions. So something is very different about this particular exception!)
>
>> It seems to me that it is not a normal exception and evades the exception clause. Any thoughts on where to go from here?
>
> Hmm, maybe the error is not being thrown when/where you think it is?
> Coercions of constants, in particular, happen very early and might
> possibly need some contortions to catch. Could we see an exact example
> of what's not working for you?
>
> regards, tom lane
>
> --
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