Question

CREATE TRIGGER [dbo].[trgAfterDelete12] ON dbo.[project_employee] 
AFTER DELETE
AS

    declare @empname varchar(25);
    declare @emp_password varchar(25);
    declare @emp_username varchar(25);
    declare @audit_action varchar(50);

    select @empname=d.Emp_Name from deleted d;  
    select @emp_password=d.Emp_Password from deleted d; 
    select @emp_username=d.Emp_username from deleted d; 
    set @audit_action=' This employee record has been  deleted ';   

    insert into project_employee_audit(Emp_name,Emp_username,Emp_password,action,update_date) 
    values(@empname,@emp_username,@emp_password,@audit_action,getdate());

    PRINT 'AFTER DELETE Trigger fired.'
GO

这是我已经创建的触发器脚本，现在当我再次尝试执行它时，它给出了错误“必须声明一个标量变量，你能告诉我脚本中的问题是什么。当它第一次出现时是好的为什么它给我这个错误信息？

Answer 1

应该是：

CREATE TRIGGER [dbo].[trgAfterDelete12] ON dbo.[project_employee] 
AFTER DELETE
AS

insert into project_employee_audit(Emp_name,Emp_username,Emp_password,action,update_date) 
select Emp_Name,Emp_username,Emp_Password,'This employee record has been  deleted ',getdate()
from deleted

由于deleted是一个伪表，可以包含多行（或没有行）。即使你对标量变量的单独赋值也会从同一（任意）行得到一致的值，也无法保证

在SQL Server 2012中，当我创建任何触发器时，它显示错误“必须声明标量变量”

1 个答案: