要求能设计一个用户名和密码的简单的数据库，通过VB的数据控件或是ADO技术实现对数据的各种简单操作包括数据的插入、删除、修改和简单查询等操作。-Requirements to design a user name and password of a simple database through VB or ADO data control technology to achieve a variety of data including data of a simple operation to insert, delete, modify, and query, such as simple operation.