This may be useful to you:
> -----Original Message-----
> From: Zysman, Roiy [mailto:roiy.zysman@stripped]
> Sent: Sunday, January 19, 2003 11:16 PM
> To: mysql@stripped
> Subject: What is the best known practice for insertion...?
> Hi All,
> I'm trying to insert multiple lines to a table with 3 col.
> All 3 of them
> are a part of the primary key.
> But while inserting the data , sometime occurs the situation where I
> want to insert an already exist entry with the same keys. And mysql
> barfs out that this key already exist in the table.
> The solution to it would be probably to query for each entry that I'm
> about to insert if that entry exists , but it looks like it
> would be an
> enormous overhead. I'm asking this question on a
> _performance_ context .
> What is the best way , ignore the error messages mysql barfs out or
> query each entry for existences before inserting it ?