Thread: Catch exception from plpy

Hello,

Could someone show me how to catch exceptions generated by plpy.execute()?
From the documentation and other posts I understand that you need to call plpy.
error() but I still cannot figure out how to use it.

For example, say I need a function that creates table foo if it doesn't
exists, otherwise returns the rows in foo. Initially I thought the following
shouldl work... but it doesn't!

--
create or replace function test_tryex() returns void AS $$
    try:
        plpy.execute('create table tmp_foo (v1 int);')
    except:
        plpy.execute('select * from tmp_foo;')
    $$
language plpythonu;
--
-- If tmp_foo already exists I get:
select test_tryex();

********** Error **********

ERROR: relation "tmp_foo" already exists
SQL state: 42P07
Context: SQL statement "create table tmp_foo (v1 int);"


Many thanks in advance
Dario

use try with exception e.g.

create or replace function test_tryex() returns void AS
'
try:
    plpy.execute('create table tmp_foo (v1 int);
    plpy.execute('select * from tmp_foo);
except Exception, ex:
    plpy.notice("FUBAR!-- %s" % str(ex))
    return "FUBAR!"
return "test_tryex function has succeeded"'
'
    LANGUAGE plpythonu;

Martin Gainty
______________________________________________
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> Date: Sat, 24 Apr 2010 14:48:33 +0200
> From: dario.ber@libero.it
> To: pgsql-general@postgresql.org
> Subject: [GENERAL] Catch exception from plpy
>
> Hello,
>
> Could someone show me how to catch exceptions generated by plpy.execute()?
> From the documentation and other posts I understand that you need to call plpy.
> error() but I still cannot figure out how to use it.
>
> For example, say I need a function that creates table foo if it doesn't
> exists, otherwise returns the rows in foo. Initially I thought the following
> shouldl work... but it doesn't!
>
> --
> create or replace function test_tryex() returns void AS $$
> try:
> plpy.execute('create table tmp_foo (v1 int);')
> except:
> plpy.execute('select * from tmp_foo;')
> $$
> language plpythonu;
> --
> -- If tmp_foo already exists I get:
> select test_tryex();
>
> ********** Error **********
>
> ERROR: relation "tmp_foo" already exists
> SQL state: 42P07
> Context: SQL statement "create table tmp_foo (v1 int);"
>
>
> Many thanks in advance
> Dario
>
> --
> Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-general

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