title: Inserting null to an Integer column using JDBC
body: <p>I have an sql column <code>PROTOCOL</code>, it is nullable and has a constraint on the table</p>
  
  <pre><code>PROTOCOL IN (1, 2, 3)
  </code></pre>
  
  <p>Also since it is nullable, I want to set and get null values into table</p>
  
  <p>But I cannot do <code>setInt</code> and <code>getInt</code> as null. How to set a null to column as null using JDBC</p>
  
  <pre><code>setInt(4,null);
  </code></pre>