>Not a good feature for me.

Me neither, but...

>Check existence and then insert or update.

At least once a week I seem to be responding to this exact same suggestion.  Somebody 
_please_ tell me if I'm the only one in the whole world who worries about race 
conditions?  What's wrong with just making sure there's a proper unique key, and then 
just inserting the row?  The returned error message will tell you if a failure is due 
to duplicate key, missing non-null column, or an actual disaster.



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