sql server 触发器实时同步数据库表数据

sql server 触发器实时同步数据库表数据

创建两个相同结构的数据库表

CREATE TABLE [dbo].[Table_1](
	[id] [varchar](50) NOT NULL,
	[name] [varchar](50) NULL,
	[dept] [varchar](50) NULL,
	[company] [varchar](50) NULL
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[Table_2](
	[id] [varchar](50) NOT NULL,
	[name] [varchar](50) NULL,
	[dept] [varchar](50) NULL,
	[company] [varchar](50) NULL
) ON [PRIMARY]
GO

创建触发器

向数据库表Tabel1增加触发器，当该表中数据发生变化则触发相应的触发器，分别是insert、update、delete

检查触发器是否已存在

--如果存在同名触发器则删除
if exists(select * from sys.triggers where name= 'trigger_insert')
drop trigger trigger_insert
go 

--创建insert触发器
create trigger  trigger_insert
ON Table_1 for insert
as
insert into Table_2 
select * from [Table_1]
where not exists(select 1 from [Table_2]
where [Table_1].id = [Table_2].id)
go

--创建update触发器
create trigger trigger_update
ON Table_1 for update
as
	if update(id)
		begin 
			update Table_2 set Table_2.name = inserted.name from Table_2,inserted  where inserted.id=Table_2.id
		end
go

--创建delete触发器
create trigger trigger_delete
ON Table_1 for delete
as	
		begin 
			delete Table_2  from Table_2,deleted  where deleted.id=Table_2.id
		end
go

测试触发器

当向数据库表Tabel1中插入、更新和删除数据时，将触发相应的触发器，对Table2表进行实时同步更新