At 7:10 PM -0700 8/17/05, Daevid Vincent wrote:
>Does mySQL have a way to INSERT a new record if one doesn't exist (based
>upon primary compound key)?
>
>I see this "EXISTS" but not an example of how to use it with INSERT.
>
>I see "INSERT... ON DUPLICATE KEY UPDATE col_name=expr" which is very close,
>but I want it to do nothing on duplicate key. :(
Perhaps you could update using the same value? Eg:
INSERT ... ON DUPLICATE KEY UPDATE col_name=col_name
If you're worried about side-effects (eg; updating a timestamp column
incorrectly), I believe that MySQL will not perform the update if the
column value does not change.
steve
>mysqladmin Ver 8.40 Distrib 4.0.24, for pc-linux-gnu on i386
>
>CREATE TABLE `release_test` (
> `BID` int(10) unsigned NOT NULL default '0',
> `ReleaseID` smallint(5) unsigned NOT NULL default '0',
> `Tested` tinyint(1) unsigned NOT NULL default '0',
> `CoreID` smallint(3) unsigned NOT NULL default '0',
> KEY `BID` (`BID`,`ReleaseID`),
> KEY `ReleaseID` (`ReleaseID`)
>) TYPE=MyISAM;
>
>
>
>--
>MySQL General Mailing List
>For list archives: http://lists.mysql.com/mysql
>To unsubscribe: http://lists.mysql.com/mysql?unsub=1
--
+--------------- my people are the people of the dessert, ---------------+
| Steve Edberg http://pgfsun.ucdavis.edu/ |
| UC Davis Genome Center sbedberg@stripped |
| Bioinformatics programming/database/sysadmin (530)754-9127 |
+---------------- said t e lawrence, picking up his fork ----------------+
