create login login1 with password='111111' --创建一个login，用于登录
go
use BookDB --在数据库BookDB上创建用户user1，拥有下面三个权限
go
create user user1 for login login1 with default_schema=dbo
go
exec sp_addrolemember 'db_ddladmin','user1'
exec sp_addrolemember 'db_datareader','user1'
exec sp_addrolemember 'db_datawriter','user1'
go
use BookLibrary --在数据库BookLibrary上创建用户user2，赋予下面三个权限
go
create user user2 for login login1 with default_schema=dbo
go
exec sp_addrolemember 'db_ddladmin','user2'
exec sp_addrolemember 'db_datareader','user2'
exec sp_addrolemember 'db_datawriter','user2'
go
use BookLibrary --在数据库BookLibrary上创建用户user2，收回下面三个权限
go
exec sp_droprolemember 'db_ddladmin','user2'
exec sp_droprolemember 'db_datareader','user2'
exec sp_droprolemember 'db_datawriter','user2'
go
--上面复权的另一种写法
USE BookLibrary
GO
ALTER ROLE db_ddladmin add MEMBER user2
GO
ALTER ROLE db_datareader add MEMBER user2
GO
ALTER ROLE db_datawriter add MEMBER user2
--上面收权的另一种写法
USE BookLibrary
GO
ALTER ROLE db_ddladmin DROP MEMBER user2
GO
ALTER ROLE db_datareader DROP MEMBER user2
GO
ALTER ROLE db_datawriter DROP MEMBER user2
GO