Nested transaction - I am a bank ??

Can I use a "set transaction" type mechanism within a function?

thx
Deep

-----Original Message-----
From: Joshua D. Drake [mailto:jd@commandprompt.com]
Sent: Tuesday, January 13, 2004 10:17 AM
To: Thapliyal, Deepak
Cc: 'Richard Huxton'; Anton.Nikiforov@loteco.ru;
pgsql-general@postgresql.org
Subject: Re: [GENERAL] Nested transaction - I am a bank ??


Thapliyal, Deepak wrote:

>Hi,
>
>Assume I have a bank app.. When customer withdraws $10 from his
>accouint I have to do following
>    --> update account_summary table [subtract $10 from his account]
>    --> update account detail_table [with other transaction details]
>
>Requirement:
>    either both transactions should succeed or both transactions should
be
>rolled back in case of failure.
>
>Question:
>    if my first update succeeds and second fails (say due to space
errors
>.. I have inconsistancy ..
>
>

Not if you run the queries as a single transaction.


>Per the thread below stored procedures/functions cannot have commits. I
>assume that means that they will be implicitly commited ??
>
>How do I approach this simple requirment using psql ?
>
>Thx
>Deep
>
>-----Original Message-----
>From: pgsql-general-owner@postgresql.org
>[mailto:pgsql-general-owner@postgresql.org] On Behalf Of Richard Huxton
>Sent: Tuesday, January 13, 2004 4:32 AM
>To: Anton.Nikiforov@loteco.ru
>Cc: pgsql-general@postgresql.org
>Subject: Re: [GENERAL] Parse error help needed...
>
>
>On Tuesday 13 January 2004 12:01, Anton.Nikiforov@loteco.ru wrote:
>
>
>>RH> Remove the "commit" line - functions cannot define their own
>>transactions RH> anyway.
>>Do you know if it will be solved sometime? Or this is architecture
>>dependend problem? I mean that transactions are rulez and very helpful
>>rulez when working with large databases.
>>
>>
>
>Nested transactions are on the todo list, but I don't know when they
>will
>appear.
>
>
>


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