删除数据库中所有表的记录，怎么不工作？

use emsb7_test1023

declare @name varchar(140)

declare ##cursor cursor for select name from emsb7_test1023.dbo.sysobjects where xtype=\'U\'

open ##cursor

fetch next from ##cursor into @name

while @@fetch_status=0

begin

exec(\'truncate table \'+ @name)
----少些一句：fetch next from ##cursor into @name 从而陷入了死循环

end

close ##cursor

deallocate ##cursor

怎么不工作？原因就是
----少些一句：fetch next from ##cursor into @name 从而陷入了死循环

use emsb7_test1023

declare @name varchar(140)

declare c cursor for select name from emsb7_test1023.dbo.sysobjects where xtype=\'U\'

open c

fetch next from c into @name

while @@fetch_status=0

begin

exec(\'truncate table \'+ @name)

fetch next from c into @name

end

close c

deallocate c