Thread: Libpq and transactions

Hi! 

I have a question about how transaction behaves in libpq library.
It is very clear in doc that PQexec treats each command (which could 
comprise of more than one sql command) as a single transactions. 
Does PQexecParams() and PQexecPrepared() also behaves the same?
Is there a way to send multiple sql commands separately through
libpq library and rollback if nth command fails. For example, Can I
insert 5 rows using PQexecParams() and rollback all 5 rows if
sixth insert fails?

Regards,
Brijesh

On 2004-07-07 01:50, Użytkownik Brijesh Shrivastav napisał:
> Hi! 
> 
> I have a question about how transaction behaves in libpq library.
> It is very clear in doc that PQexec treats each command (which could 
> comprise of more than one sql command) as a single transactions. 

Not exactly. PQexec treats each command as a single transaction only 
when you don't add "begin" before your query. If you add "begin" before 
first query - it will finish after "commit" or "rollback".

Regards,
Tomasz Myrta

Thanks for clarification! I got confused with document wording.

Brijesh Shrivastav

-----Original Message-----
From: Tomasz Myrta [mailto:jasiek@klaster.net]
Sent: Wednesday, July 07, 2004 12:05 AM
To: Brijesh Shrivastav
Cc: PostgreSQL Interfaces
Subject: Re: [INTERFACES] Libpq and transactions


On 2004-07-07 01:50, Użytkownik Brijesh Shrivastav napisał:
> Hi!
>
> I have a question about how transaction behaves in libpq library.
> It is very clear in doc that PQexec treats each command (which could
> comprise of more than one sql command) as a single transactions.

Not exactly. PQexec treats each command as a single transaction only
when you don't add "begin" before your query. If you add "begin" before
first query - it will finish after "commit" or "rollback".

Regards,
Tomasz Myrta

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