Question

I have an sql column PROTOCOL, it is nullable and has a constraint on the table

PROTOCOL IN (1, 2, 3)

Also since it is nullable, I want to set and get null values into table

But I cannot do setInt and getInt as null. How to set a null to column as null using JDBC

setInt(4,null);

Answer 1

Try using.

   pst.setNull(4, java.sql.Types.INTEGER);  //pst is prepared statement instance.

Interface PreparedStatement.setNull API

Mapping of java.sql.Types to SQL types

P.S. : Edited to reflect Java 8 updates.