How to exclusively lock a row that prevent CRUD operation

Question

Hi expert how I can lock a row in sql server that prevent CRUD operation even SELECT. Is it Possible? Serializable Isolation level does not prevent SELECT. thanks

Answer 1

BEGIN TRAN

    SELECT 1
    FROM Table
    WITH (XLOCK, ROWLOCK)

COMMIT TRAN

That will do the trick.

EDIT

As noted by others, you cannot lock a row to not be read. The only way I know of doing this is as follows:

WITH (UPDLOCK, TABLOCK)

And this is assuming that a WITH (NOLOCK) is never used in a SELECT statement (which should be avoided anyway).

I tested this and it will work, although TABLOCK should only be used in extreme cases. Certainly if concurrency is required, it's a bad solution and some other form of locking would be needed. One way is to update a bit column "Available True/False" and only read rows where Available = True. As @gbn suggested, READPAST could be used with this.