Call a function with one IN parameter with VARCHAR type in Java

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Types;
/*from ww w  .jav  a  2 s. c  o  m*/
public class Main {
  public static void main(String[] args) throws Exception {
    Connection connection = getConnection();
    CallableStatement cs = connection.prepareCall("{? = call myfuncin(?)}");

    cs.registerOutParameter(1, Types.VARCHAR);

    // Set the value for the IN parameter
    cs.setString(2, "a string");

    // Execute and retrieve the returned value
    cs.execute();
    String retValue = cs.getString(1);

  }

  private static Connection getConnection() throws Exception {
    Class.forName("org.hsqldb.jdbcDriver");
    String url = "jdbc:hsqldb:mem:data/tutorial";

    return DriverManager.getConnection(url, "sa", "");
  }
}