sqlserver触发器引起的死锁问题
使用一个触发器,只是添加时才触发,目的为了限制ip三分钟发送一条短信,这个表某一段时间内访问频率非常之高,今天高峰时出现了死锁的情况 可能是因为没有判断用户的原因,现在加上用户判断再观察一下,代码大概如下: ALTER trigger [ dbo ] . [ trg_drv_y
使用一个触发器,只是添加时才触发,目的为了限制ip三分钟发送一条短信,这个表某一段时间内访问频率非常之高,今天高峰时出现了死锁的情况
可能是因为没有判断用户的原因,现在加上用户判断再观察一下,代码大概如下:
ALTER trigger [dbo].[trg_drv_yzm_insert] on [dbo].[drv_yzm] for insert
as
begin
if (CURRENT_USER='testuser')
begin
declare @lastcreatet varchar(50)
declare @lastdate datetime
declare @id int,@clientip varchar(15),@type varchar(20)
select @id=id,@clientip=clientip,@type=type from inserted;
select top 1 @lastcreatet=createt from drv_yzm where clientip=@clientip and type='pre' and id@id order by createt desc
set @lastdate = convert(datetime,substring(left(@lastcreatet,8)+' ' + substring(@lastcreatet,9,2)+':' + substring(@lastcreatet,11,2)+':' + substring(@lastcreatet,13,2),1,17))
set @lastdate = dateadd(mi,3,@lastdate)
if(@lastdate>GETDATE() and @type='pre')
update drv_yzm set status='0' where id=@id
end
end

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