title: JDBC - How to insert a string value
body: <p>When trying to insert the value of a string into my db using JDBC instead of inserting the String's value it inserts the String's name.</p>
  
  <p>I have a string named firstName, the value of this string is given by user input.</p>
  
  <p>Here is my sql statement:</p>
  
  <pre><code>String sql = "Insert INTO users (ID, firstName, address) VALUES ('124','+firstName()','123')";
  </code></pre>