import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class UpdateTable {

    public static void main(String[] args) throws Exception {

        Connection c = null;
        Statement stat = null;

        try {
             // Cargar controlador de datos, base de datos
            Class.forName("org.postgresql.Driver");
             // Conéctese a la dirección de la base de datos, nombre, contraseña
            c= DriverManager
                    .getConnection("jdbc:postgresql://127.0.0.1:5432/postgres", "postgres", "maxhito");
            c.setAutoCommit(false);
            System.out.println("Opened database successfully");

            stat = c.createStatement();
            String sql = "UPDATE BBQ SET AGE=15 WHERE ID=2 ;";
            stat.executeUpdate(sql);
            c.commit();

             // Consulta la base de datos
            ResultSet rs = stat.executeQuery("SELECT * FROM BBQ;");
            while ( rs.next() ) {
                int id = rs.getInt("id");
                String  name = rs.getString("name");
                int age  = rs.getInt("age");
                String  address = rs.getString("address");
                System.out.println( "ID = " + id );
                System.out.println( "NAME = " + name );
                System.out.println( "AGE = " + age );
                System.out.println( "ADDRESS = " + address );
                System.out.println();
             }
            rs.close();
            stat.close();
            c.close();
        } catch (ClassNotFoundException e) {
            System.err.println( e.getClass().getName()+": "+ e.getMessage() );
            System.exit(0);
        }
        System.out.println("Operation done successfully");
    }

}