sqlserver触发器的使用

在sqlserver2008中因为服务器网络设置须要，部署了两个结构相同的数据库，并要求对这两个数据库中其中任何一个库作任何更改均要同步到另外一个库中

因此就在两个库分别建立了触发器，以便同步

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如库1为hmi_Yanke，库2为hmi_Yanke2，两个库都存在表TDisplay

则在库1建立触发器以下

 1 --建立[hmi_Yanke].[dbo].[TDisplay]表的触发器
 2 create trigger [dbo].[trigger_TDisplay]
 3 on [HMI_YanKe2].[dbo].[TDisplay]
 4 AFTER INSERT,UPDATE,DELETE
 5 as 
 6 begin
 7 declare @RowsD Int,@RowsI Int,@Dml Int
 8 --肯定是哪种dml操做
 9 Select @RowsD=Count(*) From Deleted
10 Select @RowsI=Count(*) From Inserted
11 If @RowsD=0 And @RowsI=0  
12 Goto Exit_
13 If @RowsD=0 And @RowsI>0
14     Set @Dml=1
15 Else If @RowsD>0 And @RowsI>0
16     Set @Dml=2
17 Else If @RowsD>0 And @RowsI=0
18     Set @Dml=3 
19 IF @DML=1
20 BEGIN
21 --插入
22     IF NOT EXISTS(SELECT TOP 1 1 FROM [hmi_Yanke].[dbo].[TDisplay] c,inserted i where  c.FID=i.FID)
23     begin 
24     set IDENTITY_INSERT [hmi_Yanke].[dbo].[TDisplay] ON 
25     insert into [hmi_Yanke].[dbo].[TDisplay]( [FID],FFieldCN,FFieldEN,FTable,FOrder,FType,FNullable,FLength,FWidth)
26     select [FID],FFieldCN,FFieldEN,FTable,FOrder,[FType],FNullable,FLength,FWidth from inserted
27     set IDENTITY_INSERT [hmi_Yanke].[dbo].[TDisplay] OFF
28     end
29 END
30 IF @DML=2
31 begin 
32     --修改
33     IF NOT EXISTS
34     (SELECT TOP 1 1 FROM [hmi_Yanke].[dbo].[TDisplay] c,INSERTED i 
35         where c.[FID]=i.[FID] and c.FFieldCN=i.FFieldCN and c.FFieldEN=i.FFieldEN and c.FTable=i.FTable 
36         and c.FOrder=i.FOrder and c.[FType]=i.[FType] and c.FNullable=i.FNullable and c.FLength=i.FLength 
37         and c.FWidth=i.FWidth )
38     UPDATE [hmi_Yanke].[dbo].[TDisplay] set FFieldCN=i.FFieldCN,FFieldEN=i.FFieldEN,FTable=i.FTable,FOrder=i.FOrder,[FType]=i.[FType],FNullable=i.FNullable,FLength=i.FLength,FWidth=i.FWidth
39         FROM [hmi_Yanke].[dbo].[TDisplay] c,INSERTED i where c.[FID]=i.[FID]
40     --select * from INSERTED
41     --select * from deleted
42 end
43 IF @DML=3
44     BEGIN
45     --删除
46         IF  EXISTS(SELECT TOP 1 1 FROM  [hmi_Yanke].[dbo].[TDisplay] c,deleted d where  c.[FID]=d.[FID]) 
47         DELETE [hmi_Yanke].[dbo].[TDisplay] FROM [hmi_Yanke].[dbo].[TDisplay] c,deleted d 
48         WHERE c.[FID]=d.[FID] 
49     END
50 EXIT_: 
51 end

在库2建立触发器与上面相同，只须要将hmi_Yanke改成hmi_Yanke2便可

简单测试后获得正确结果

 1   INSERT INTO [HMI_YanKe].[dbo].[TDisplay] values('haha','haha','haha',1,'haha',1,1,1),('hehe','hehe','hehe',2,'hehe',2,2,2)
 2   INSERT INTO [HMI_YanKe2].[dbo].[TDisplay] values('xixi','xixi','xixi',1,'xixi',1,1,1),('keng','keng','keng',2,'keng',2,2,2)
 3 
 4   update [HMI_YanKe].[dbo].[TDisplay] set FFieldCN='vinjack' where FFieldCN='haha'
 5   update [HMI_YanKe2].[dbo].[TDisplay] set FFieldCN='vinjane' where FFieldCN='xixi'
 6 
 7   delete [HMI_YanKe].[dbo].[TDisplay] where FFieldCN in('vinjack','hehe')
 8   delete [HMI_YanKe2].[dbo].[TDisplay] where FFieldCN in('vinjane','keng')
 9   
10   select *  FROM [HMI_YanKe].[dbo].[TDisplay]
11   select *  FROM [HMI_YanKe2].[dbo].[TDisplay]