ResultSet warning

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;
//from  j  a va2  s.  c o  m
public class Main {
  public static void main(String[] args) throws Exception {

    // Get warnings on ResultSet object
    ResultSet rs = null;
    Connection conn = null;
    Statement stmt = null;
    try {
      conn = getConnection(); // get a java.sql.Connection object
      stmt = conn.createStatement(); // create a statement
      // get a result set
      String sqlQuery = "select id, name from employees";
      rs = stmt.executeQuery(sqlQuery);
      while (rs.next()) {
        // use result set
        // 
        // get warnings on the current row of the ResultSet object
        SQLWarning warning = rs.getWarnings();
        if (warning != null) {
          // process result set warnings
        }
      }
    } catch (SQLException e) {
      // ignore the exception
    } finally {
      // close JDBC resources: ResultSet, Statement, Connection
    }

  }

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

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