Also notice that, the HTML input feld created for the database table feld id is a hidden form feld.That is quite logical as while editing a record, we obviously must not edit its primary feld.

• 另外需需要注意的，为数据库表中的id字段创建的HTML输入框是一个隐藏的表单输入框，当我们编辑一条记录时，我们显然不会编辑它的主键所在字段。