Re: error handling

On 5/10/06 9:35 AM, "Verena Ruff" <lists(at)triosolutions(dot)at> wrote:

> Hello,
>
> sorry for answering so late, ...
>> I do not know if there is an specific error handler built in postgresql
>> (besides error-codes).
>>
>> If you break the unique constraint an error will be thrown. A
>> workaround may be to launch a trigger BEFORE the insertion and do whatever is
>> necessary within the trigger.
>>
> This is possibillity I was thinking of, too. But if there are many
> inserts and (probably) only a few of them would break the unique
> constraint, there would be a great overhead. This was what I'd like to
> avoid with a custom error handler.

Probably the simplest way to do this is to load the data into a temporary
table without the unique constraint then use SQL to insert a "clean" version
into the new table. Alternatively, you could use savepoints. If an insert
fails, just rollback to that savepoint. If it succeeds, commit that
savepoint.

Sean