使用JDBC从数据库中查询数据的方法

@Test  public void testResultSet(){    //获取id=2的customers数据表的记录，并打印    Connection connection = null;    Statement statement = null;    ResultSet rs = null;    try {      //1.获取Connection      connection = JDBCTools.getConnection();      //2.获取Statement      statement = connection.createStatement();      //3.准备Sql      String sql = "SELECT * FROM CUSTOMERS WHERE ID=2";      //4.执行查询，得到ResultSet      rs = statement.executeQuery(sql);      //5.处理ResultSet      while(rs.next()){        //rs.get+数据库中对应的类型+(数据库中对应的列别名)        int id = rs.getInt("ID");        String name = rs.getString("name");        String email = rs.getString("email");        Date birth = rs.getDate("birth");                System.out.println(id);        System.out.println(name);        System.out.println(email);        System.out.println(birth);      }    } catch (Exception e) {      e.printStackTrace();    }finally{      //6.关闭数据库相应的资源      JDBCTools.release(rs, statement, connection);    }  }