If I understand you and
USER1 starts this pl/pgsql body function
BEGIN
SELECT count(*) AS c1 FROM debits;
........
........ -- Here USER2 INSERTS a new row in debits table. --
........
SELECT count(*) AS c2 FROM debits
IF c1 = c2 THEN
RETURN true
ELSE
RETURN false
END IF;
END;
This functions returns TRUE ? It is right ?
Thanks...
Oliver Elphick wrote:
>
> On Wed, 2002-09-11 at 14:34, Terry Yapt wrote:
> ...
> > And here is the problem because more client connections are inserting
> debits (and perhaps to the same customer_number I am working with), but
> I _ONLY_ MUST to update the debits.bill_number to that debits.ROWS I
> have treated in the bill.ROW creation step.
>
> I think you are worrying about a non-problem.. If you are working in a
> PL/PGSQL function. anything you do will automatically happen inside one
> transaction. Therefore, nothing that happens to the database after that
> transaction starts will be visible to your function. So you don't have
> to worry about subsequent changes.
>
> If you are doing several inserts before doing your bill update, and
> don't want a later bill to include the ones you are dealing with,
> enclose all your SQL commands in BEGIN ... END to turn them all into one
> transaction. (Don't confuse PL/PGSQL's BEGIN...END with SQL's
> BEGIN...END) None of the results of the transaction will be visible to
> other connections until the transaction is committed.
>
> --
> Oliver Elphick Oliver.Elphick@lfix.co.uk
> Isle of Wight, UK
> http://www.lfix.co.uk/oliver
> GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C
> ========================================
> "I am crucified with Christ; nevertheless I live; yet
> not I, but Christ liveth in me; and the life which I
> now live in the flesh I live by the faith of the Son
> of God, who loved me, and gave himself for me."
> Galatians 2:20
