游标使用方法：
use db1
declare my_cursor cursor scroll dynamic /*scroll表示可随意移动游标指针（否则只能向前），dynamic表示可以读写游标（否则游标只读）*/
for
select 姓名 from 个人资料
open my_cursor
declare @name sysname
fetch next from my_cursor into @name
while(@@fetch_status=0)
begin
print '姓名: ' + @name
fetch next from my_cursor into @name
end
fetch first from my_cursor into @name
print @name
/* update 个人资料 set 姓名='zzg' where current of my_cursor */
/* delete from 个人资料 where current of my_cursor */
close my_cursor
deallocate my_cursor
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