Public select_menu As String '标记所选择的菜单 Public userpow As String '标记用户权限 Public book_num As String '要借的书的编号 ..
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唯一例外是当用户没有删除权限或数据库被标记为损坏 ；
The only exceptions are when a user does not have delete rights or when the database is marked as corrupted; then, the .
当一个经过授权的用户创建一个SQL对象(比如视图)时，该用户的权限ID就被标记为对象的定义者。
When an authorized user creates an SQL object, such as a view, the authorization ID of the user is marked as the definer of the object.
要检查权限是否有效，创建一个新用户，然后将其标记为Staff。
To verify that the rights work, create a new user, and label that user Staff.
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