sql-server - SQL Server 中的插入/删除/更新触发器

Question

我正在尝试生成一个一体化的删除/插入/更新触发器。我在第二个和第三个 AFTERS 附近出现两个“语法错误”，在最后一个 END 附近出现语法错误。

CREATE TRIGGER trig_all_dml
 ON [dbo.file]
 AFTER UPDATE
 AS BEGIN
    UPDATE 
           (excess code)       
 END

 AFTER INSERT
 AS BEGIN
     UPDATE 
             (excess code)
  END

 AFTER DELETE
 AS BEGIN
    UPDATE (excess code)

  END
  GO

希望这是足够的信息。我认为问题出在我的语法上，但我在网上找不到正确的语法。

Answer 1

我给你的是插入、更新和删除触发器的代码这在 Microsoft SQL SERVER 2008 及更高版本上运行良好我使用的数据库是 Northwind

/* comment section first create a table to keep track of Insert, Delete, Update
create table Emp_Audit(
                    EmpID int,
                    Activity varchar(20),
                    DoneBy varchar(50),
                    Date_Time datetime NOT NULL DEFAULT GETDATE()
                   );

select * from Emp_Audit*/

create trigger Employee_trigger
on Employees
after UPDATE, INSERT, DELETE
as
declare @EmpID int,@user varchar(20), @activity varchar(20);
if exists(SELECT * from inserted) and exists (SELECT * from deleted)
begin
    SET @activity = 'UPDATE';
    SET @user = SYSTEM_USER;
    SELECT @EmpID = EmployeeID from inserted i;
    INSERT into Emp_Audit(EmpID,Activity, DoneBy) values (@EmpID,@activity,@user);
end

If exists (Select * from inserted) and not exists(Select * from deleted)
begin
    SET @activity = 'INSERT';
    SET @user = SYSTEM_USER;
    SELECT @EmpID = EmployeeID from inserted i;
    INSERT into Emp_Audit(EmpID,Activity, DoneBy) values(@EmpID,@activity,@user);
end

If exists(select * from deleted) and not exists(Select * from inserted)
begin 
    SET @activity = 'DELETE';
    SET @user = SYSTEM_USER;
    SELECT @EmpID = EmployeeID from deleted i;
    INSERT into Emp_Audit(EmpID,Activity, DoneBy) values(@EmpID,@activity,@user);
end