Gandalf wrote:
>
> Hi All!
>
> I don't know if this is the right place to write. I was redirected here
> from the psycopg list (a Python PostgreSQL interface).
> They told me what I want is not to be done in the python extension lib
> because it is in the heart of PostgreSQL.
>
> Here is my problem. Every time an error occurs (e.g. I try to execute a
> SQL query and it fails) something happens to the backend.
> It is starting not to execute further commands in the same transaction.
>
It is because the transaction has failed and thus rolledback. We do not
support nested transactions.
Sincerely,
Joshua D. Drake
> Why is that? I would like to decide if I want to continue my transaction
> or not. In my situation, I just can't tell if a command
> will fail or not. It would be too hard and too slow to determine if my
> command will fail or not. (Consider a difficult UPDATE
> command in a large database with many constraints -- you just cannot
> check if it will fail.) Hey, this is why exceptions was
> born! From the other side, I must be able to commit or rollback all my
> changes at the end of the block, depending on several
> things. I think this situlation is real and the problem is real. I had
> no such problems with FireBird, Oracle, MS SQL and SAP-DB. However, I
> still think PostgreSQL is the most advanced one. (Exception is Oracle
> which has a horrible price...)
>
> I'm not sure about this, but I think it would not be too hard to
> implement this as a setting.
> For example,. it could be an extension to 'SET SESSION CHARACTERISTICS'.
> I'm not a DB guru but I learnt DB implementation techniques and AFAIK
> there is no implementation barrier here.
> The backend could continue processing commands without big
> logical/concurrency/transaction handling problems.
>
> Can you help me please? Any developer out there who can explain this?
> Comments welcome.
>
> Cheers,
>
> G
>
>
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