说到同步,其实是靠"作业"定时调度存储过程来操作数据,增,删,改,全在里面,结合触发器,游标来实现,关于作业调度,我使用了5秒运行一次来实行"秒级作业",这样基本就算比较快的"同步"
我做的是SQL Server往Oracle端同步,先在sql server上建立往Oracle端的链接服务器,我用一个视图"封装"了一下链接服务器下的一张表。
create view v_ora_PUBLISHLASTREC
as
select * from ORACLEDB..ROADSMS.PUBLISHLASTREC
//ORACLEDB链接服务器名,ROADSMS为表空间名,PUBLISHLASTREC 为数据表名
然后我们分别在sql server 要同步的表上建立,insert,delete,update触发器
脚本如下:
--说明:modiid等于1为insert,2为delete,3为update
create trigger trg_PUBLISHLASTREC_insert on PUBLISHLASTREC for insert
as
insert into dbo.PublishLastRec_SQL(modiid,SignalGUID,AreaNo,SignalNote,AreaNote,PublishRoadStatus,PublishTime,IsExec)
select '1',SignalGUID,AreaNo,SignalNote,AreaNote,PublishRoadStatus,PublishTime,'0' from inserted
create trigger trg_PUBLISHLASTREC_update on PUBLISHLASTREC for update
as
insert into dbo.PublishLastRec_SQL(modiid,SignalGUID,AreaNo,SignalNote,AreaNote,PublishRoadStatus,PublishTime,IsExec)
select '3',SignalGUID,AreaNo,SignalNote,AreaNote,PublishRoadStatus,PublishTime,'0' from inserted
create trigger trg_PUBLISHLASTREC_delete on PUBLISHLASTREC for delete
as
insert into dbo.PublishLastRec_SQL(modiid,SignalGUID,AreaNo,SignalNote,AreaNote,PublishRoadStatus,PublishTime,IsExec)
select '2',SignalGUID,AreaNo,SignalNote,AreaNote,PublishRoadStatus,PublishTime,'0' from deleted
所有的操作都是把各幻表的数据插入到一张表中,上面统一插入的表为PublishLastRec_SQL,记录下操作的标识,以标识该条记录是插入,删除,还是修改,modiid等于1为insert,2为delete,3为update,字段isexec标识该条记录是否已处理,0为未执行的,1为已执行的
接着就是最关键的一步,存储过程
脚本如下:
ALTER proc pro_PublishLastRec_Sql
as
declare @modiid int
declare @signalguid int
declare @areano numeric(1,0)
declare @signalnote varchar(50)
declare @areanote varchar(50)
declare @publishroadstatus varchar(20)
declare @publishtime varchar(50)
if not exists(select * from PublishLastRec_SQL where IsExec=0)
begin
truncate table PublishLastRec_SQL
return
end
declare cur_sql cursor for
select modiid,SignalGUID,AreaNo,SignalNote,AreaNote,PublishRoadStatus,PublishTime from
PublishLastRec_SQL where IsExec=0 order by [id]--IsExec 0为未执行的,1为已执行的
open cur_sql
fetch next from cur_sql into @modiid,@SignalGUID,@AreaNo,@SignalNote,@AreaNote,@PublishRoadStatus,@PublishTime
while @@fetch_status=0
begin
if (@modiid=1) --插入
begin
insert into v_ora_PUBLISHLASTREC(SignalGUID,AreaNo,SignalNote,AreaNote,PublishRoadStatus,PublishTime)
values(@SignalGUID,@AreaNo,@SignalNote,@AreaNote,@PublishRoadStatus,@PublishTime)
end
if (@modiid=2) --删除
begin
delete from v_ora_PUBLISHLASTREC where SignalGUID=@SignalGUID and AreaNo=@AreaNo
end
if (@modiid=3) --修改
begin
update v_ora_PUBLISHLASTREC
set SignalNote=@SignalNote,AreaNote=@AreaNote,PublishRoadStatus=@PublishRoadStatus,
PublishTime=@PublishTime
where SignalGUID=@SignalGUID and AreaNo=@AreaNo
end
update PublishLastRec_SQL
set IsExec=1
where current of cur_sql
fetch next from cur_sql into @modiid,@SignalGUID,@AreaNo,@SignalNote,@AreaNote,@PublishRoadStatus,@PublishTime
end
deallocate cur_sql
该存储过程使用游标逐行提取PublishLastRec_Sql记录,根据modiid判断不同的数据操作,该条记录处理完毕后把isexec字段更新为1.
最后是调用该存储过程的作业,我们先建一个一分钟运行一次的作业,然后在"步骤"的脚本中这样写:
DECLARE @dt datetime
SET @dt = DATEADD(minute, -1, GETDATE())
WHILE @dt < GETDATE()
BEGIN
EXEC pro_PublishLastRec_Sql --这里pro_PublishLastRec_Sql 为你要作业执行的存储过程
WAITFOR DELAY '00:00:05' -- 等待5秒, 根据你的需要设置即可
END
现在，我们即可以实现5秒执行一次该存储过程,做到5秒数据同步
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