Re: [Q] Sequences, last_value and inserts - Mailing list pgsql-general

From Bruno Wolff III
Subject Re: [Q] Sequences, last_value and inserts
Date
Msg-id 20021101200243.GB1266@wolff.to
Whole thread Raw
In response to [Q] Sequences, last_value and inserts  ("Roderick A. Anderson" <raanders@acm.org>)
Responses Re: [Q] Sequences, last_value and inserts  ("Roderick A. Anderson" <raanders@acm.org>)
List pgsql-general
On Fri, Nov 01, 2002 at 11:50:30 -0800,
  "Roderick A. Anderson" <raanders@acm.org> wrote:
>
> I'm inserting some values into a table with a serial field.  This is being
> done using Perl and the DBI.  I then pull back using 'last_value' what I
> hope is the value for the insert. The thought came to mind that if the
> database is getting hit pretty hard there may be another access of the
> sequence and last_value will be wrong 'for me'.
>    Question is how do I insure I get the correct last-value?  Enclose in a
> BEGIN/END block?  (How's that done using Perl? - my DBI book isn't at
> hand).

You want to use currval. This can be used within a single session safely.

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