From: Andreas Wenk <a.wenk@netzmeister-st-pauli.de>
To: Jasmin Dizdarevic <jasmin.dizdarevic@gmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: on error resume next
Date: Fri, 31 Jul 2009 20:12:40 +0200
Message-ID: <4A733418.6000304@netzmeister-st-pauli.de> (raw)
In-Reply-To: <a0eee4d40907310824h3fd0df14p75b633e38fd2d203@mail.gmail.com>
References: <a0eee4d40907310824h3fd0df14p75b633e38fd2d203@mail.gmail.com>
Jasmin Dizdarevic wrote:
> hi,
>
> can i use savepoints to realize something like "on error resume next"?
>
> i've got the following situation:
>
> begin;
> 1. create view user001.accounts as select * from base.accounts;
> 2. grant select on user001.accounts to loginuser001;
> commit;
>
> begin;
> 3. create view user002.accounts as select * from base.accounts;
> 4. grant select on user002.accounts to loginuser002;
> commit;
>
>
> my goal is to avoid execution stop, if one of the transactions fail.
> let's say line 1 throws an error it should go further to line 3.
>
> any ideas?
>
> thank you.
>
> jasmin
AFAIK it's not possible. A transaction is kind of a container with a
positive or negative result. If one of the queries fails in between a
transaction, it will be rolled back after a commit. What you can do with
savepoints is the following:
usage=# CREATE TABLE test (id serial, content text);
usage=# BEGIN;
usage=# INSERT INTO test (content) VALUES ('first stuff');
usage=# SAVEPOINT s1;
usage=# INSERT INTO test (content) VALUES ();
ERROR: syntax error at or near ")"
usage=# ROLLBACK TO SAVEPOINT s1;
ROLLBACK
usage=# SELECT * FROM test;
id | content
----+--------------
1 | first stuff
(1 row)
usage=# COMMIT;
COMMIT
usage=# SELECT * FROM test;
id | content
----+--------------
1 | first stuff
(1 row)
The second INSERT statement fails. If you would go further with insert
statements and then fire a COMMIT at the end, nothing would be inserted
into the table. But if you fire a ROLLBACK TO SAVEPOINT s1, at least the
data of the first INSERT statement are written.
So maybe this is a start help for creating some logic to get something
like 'on error resume next'.
Cheers
Andy
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To: pgsql-sql@postgresql.org
Cc: a.wenk@netzmeister-st-pauli.de, jasmin.dizdarevic@gmail.com
Subject: Re: on error resume next
In-Reply-To: <4A733418.6000304@netzmeister-st-pauli.de>
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