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All we need is to create several pre-insert/update triggers in SQL Server 2008 R2 which do some select * or select count(*) and explicitly fail if it is empty or non-empty.
Please, how to achieve that?
Create an
INSTEAD OF INSERT, UPDATEtrigger. Now to prevent DML you have 2 options. In the body of trigger executeRAISERRORso your application can catch the error. Another way is not to perform actualinsert/updatein the trigger, so no records will be inserted/updated, but the user will not know if DML succeeds.