;>>> 20111219 03:42 PM -0800, Jim McNeely >>>> Not if you are using innoDB tables. For these, you use INSERT and UPDATE triggers.
Jim McNeely On Dec 19, 2011, at 11:58 AM, Halász Sándor wrote: >>>>> 2011/12/19 11:30 -0800, Jim McNeely >>>> > In the MySQL documentation, we find this tantalizing statement: > > "It is possible that in the case of a duplicate-key error, a storage engine > may perform the REPLACE as an update rather than a delete plus insert, but > the semantics are the same. There are no user-visible effects other than a > possible difference in how the storage engine increments Handler_xxx status > variables." > <<<<<<<< > Well, try it--but beware of these statements: "the semantics are the same. > There are no user-visible effects other than a possible difference in how the > storage engine increments Handler_xxx status variables." > > If accurate, the triggers are those of DELETE & INSERT, not UPDATE. <<<<<<<< In my experimenting I find (version 5.5.8) that DELETE & INSERT are triggered, not UPDATE. The statement "There are no user-visible effects..." is simply wrong. The SQL-programmer has to be ready for either outcome. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql
