MSSQL 删除数据库里某个用户所有表里的数据

declare @uname varchar(20)
declare cuser cursor for
select so.name
from sysobjects so,sysusers su where so.uid=su.uid and su.name='Stone'
and so.xtype='U'
open cuser
fetch next from cuser into @uname
while(@@fetch_status=0)
begin
exec('truncate table [Stone].['+@uname+']')
fetch next from cuser
end
close cuser
deallocate cuser

exec sp_msforeachtable @command1="truncate table ? ;",@whereand='and schema_id = (select schema_id from sys.schemas where [name] =''Stone'')'