| From: | Michael Fuhr <mike(at)fuhr(dot)org> |
|---|---|
| To: | "Eric B(dot) Ridge" <ebr(at)tcdi(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: "xmin" system column |
| Date: | 2006-01-26 22:22:50 |
| Message-ID: | 20060126222250.GA98775@winnie.fuhr.org |
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| Thread: | |
| Lists: | pgsql-general |
On Thu, Jan 26, 2006 at 05:05:19PM -0500, Eric B. Ridge wrote:
> I really need a way to create a unique identifier at the start of a
> top-level transaction, and be able to use it via triggers and/or
> column default values in that or its subtransactions.
I suppose a sequence is out of the question? Too easy to get it
wrong?
> Is there some kind of "TopXID" magic variable/function that I haven't
> found in the documentation?
Not in the standard installation, but I think a C function that
returns GetTopTransactionId() should work. It's trivial to write
and examples have been posted before; search the archives.
--
Michael Fuhr
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