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;
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