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Re: function crashes backend

From: Louis-David Mitterrand <cunctator(at)apartia(dot)ch>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: function crashes backend
Date: 2000-09-27 08:13:15
Message-ID: 20000927101315.A10137@styx (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Wed, Sep 27, 2000 at 08:53:58AM +0200, Louis-David Mitterrand wrote:
> Hello,
> I am writing a SPI function to run maintenance tasks on my auction
> system but it keeps crashing the backend after running only one loop.
> Now, I am not a C programmer, nor do I have any formal training in CS. I
> thought I might run this function by you guys so that a cursory look
> might reveal some obvious coding mistake? 
> Thanks in advance for your insight.

Following up to myself, I finally understood my problem: I was trying to
re-use SPI_tuptable->vals[i] after calling SPI_exec() on another,
unrelated query. So the backend crash makes perfect sense now.

What is the best strategy: 
- store the result of a SELECT returning multiple tuples into a local
  SPITupleTable? How do I allocate memory for that?
- iterate over all values contained in the tuples and store _them_ into
  char**, int*, arrays, before re-running SPI_exec() on the second query?


Louis-David Mitterrand - ldm(at)apartia(dot)org -

> Any suggestions for setting up WinCVS client + (server) on NT4?
Run away screaming in terror.

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