Question

As the the question says, what should I set the value of a parameter to if I don’t want it to update the DB?

e.g.

UPDATE table1
SET col1 = @someval ,
    col2 = @someotherval
WHERE col3 = 1;

If in my c# logic I decide that col2 does not need to be updated because the value being passed in is null, what should I set the parameters value so that it does not update that column?

I have to use parameterised queries and I don’t want to edit the original update statement.

Answer 1

If col2 cannot ever be updated to NULL, try this

update table1 
set col1 = @someval , col2 = ISNULL(@someotherval, col2)
where col3 = 1;