USE master
 GO
 AlterDATABASE[atest_cb]SETSINGLE_USERWITHROLLBACKIMMEDIATE
 GO
 --查看是否还有用户连接
 Select*FROMsys.[sysprocesses]WhereDB_NAME([dbid])='atest_cb'
 GO
 AlterDATABASEatest_cbSETMULTI_USER
 GO