CRUD的含义

数据访问逻辑组件代表调用程序提供对数据库执行以下任务的方法：

 

在数据库中创建记录

读取数据库中的记录并把业务实体数据返回给调用程序

使用调用程序提供的修改后的业务实体数据更新数据库中的记录

删除数据库中的记录

执行上述任务的方法通常称为“CRUD”方法，这是由各项任务的首字母组成的一个缩写词。

标准的CRUD操作- -

                                      

1. Add - Once the user clicks on the Add button/link they are presented with a
   form, clicking on Cancel takes them back to the listing with no action being
   taken, clicking on Add (or Submit, Insert, etc.) inserts the item into the
   system and returns the user to the listing.
2. Edit - Once the user clicks on the Edit button/link they are presented with a
   form representing the particular item, again clicking on Cancel takes them
   back to the listing with no action, clicking on Update updates the system with
   the user's changes and returns them to the listing.
3. Delete - Once the user clicks on the Delete button/link they are presented
   with a confirmation page identifying the item(s) they wish to delete, cancel
   takes them back to the listing, confirming deletes the item(s) and returns the
   user to the listing.
4. View - Once the user clicks on the item link (or you can have a separate
   View link) they are presented with a read-only version of the selected item
   and can either Cancel or Edit that item. Cancelling returns them to the
   listing, Edit takes them to an Edit form and follows the normal flow from
   there.