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

如此我们便实现5秒执行一次该存储过程,做到5秒同步,^_^,please enjoy!