--备份
BACKUP DATABASE [库名称] TO DISK='E:qqddd.bak'
--备份并覆盖
BACKUP DATABASE [库名称] TO DISK='E:qqddd.bak' WITH INIT
--将数据库置于离线状态
ALTER DATABASE [库名称] SET OFFLINE WITH ROlLBACK IMMEDIATE;
--恢复数据库
RESTORE DATABASE [库名称] FROM DISK = 'E:qqddd.bak' WITH REPLACE ;
--将数据库置于在线状态
ALTER DATABASE [库名称] SET ONLINE WITH ROlLBACK IMMEDIATE;