Inserting null to an Integer column using JDBC

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 nullabl

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.

Answer 2

In addition to Smit's answer:

If you want to insert an Integer-object into a database that may be null, you can use

statement.setObject(4, yourObject, java.sql.Types.INTEGER);

instead of

if (yourObject == null) {
    statement.setNull(4, java.sql.Types.INTEGER);
else {
    statement.setInt(4, yourObject);
}