SQLServer2005的查询独占模拟

这个问题一直被很多人关注，基本上得到的答案是两种倾向，一种是锁一种是给记录打标记（也就是update）。

set nocount on 
use tempdb 
go 
if (object_id ('tb' ) is not null ) 
drop table tb 
go 
create table tb (id int identity (1 , 1 ), name varchar (10 ), tag int default 0 ) 
insert into tb (name ) select 'a' 
insert into tb (name ) select 'b' 
insert into tb (name ) select 'c' 
insert into tb (name ) select 'd' 
insert into tb (name ) select 'e' 
go 
update top (2 ) tb with (rowlock , readpast ) set tag = 1 output inserted . id , inserted . name where tag = 0 
go 
update top (2 ) tb with (rowlock , readpast ) set tag = 1 output inserted . id , inserted . name where tag = 0 
go 
update top (2 ) tb with (rowlock , readpast ) set tag = 1 output inserted . id , inserted . name where tag = 0 
go 
set nocount off 
/* 
id name 
----------- ---------- 
1 a 
2 b 
id name 
----------- ---------- 
3 c 
4 d 
id name 
----------- ---------- 
5 e 
*/ 
 
如果你有更好的建议，我们不妨探讨一下。 




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