Re: on error resume next

Hi,

that's not really that what i need. I think i will solve it on client side.

thank you.
jasmin

2009/7/31 Andreas Wenk <a(dot)wenk(at)netzmeister-st-pauli(dot)de>

> 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
>
>
>
>