Contributors: 1 Tuesday, November 10, 2015
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null vs DBNull


In ADO.NET, correctly handling null is a constant source of confusion. The key point in dapper is that you don't have to; it deals with it all internally.

  • parameter values that are null are correctly sent as DBNull.Value
  • values read that are null are presented as null, or (in the case of mapping to a known type) simply ignored (leaving their type-based default)

It just works:

string name = null;
int id = 123;
connection.Execute("update Customer set Name=@name where Id=@id",
    new {id, name});