使用sql触发器获取当前用户

Question

我的一个表有以下sql触发器.我只是想知道我是否可以跟踪并添加对表进行更改的用户？

见下面的代码

ALTER trigger [dbo].[Trigger_Audit_Client] on [dbo].[Client] for insert, update, delete
as
declare @type varchar(1) ,
@UpdateDate datetime

if exists (select * from inserted) and exists (select * from deleted)
    select @type = 'U'
else if exists (select * from inserted)
    select @type = 'I'
else
    select @type = 'D'

select  @UpdateDate = getdate()

insert  Client_Audit (Client_Id, ClientName, ClientSurname, TelephoneHome, TelephoneWork, TelephoneCellular, DOB, Gender, ClientIdNumber, Company_Id, Region, City, Email, AddressLine1, AddressLine2, Will_UID, WillCreated, WillLatest, UpdateDate, UpdateType)
select  Client_Id, ClientName, ClientSurname, TelephoneHome, TelephoneWork, TelephoneCellular, DOB, Gender, ClientIdNumber, Company_Id, Region, City, Email, AddressLine1, AddressLine2, Will_UID, WillCreated, WillLatest, @UpdateDate, @type + '_old'
from deleted
insert  Client_Audit (Client_Id, ClientName, ClientSurname, TelephoneHome, TelephoneWork, TelephoneCellular, DOB, Gender, ClientIdNumber, Company_Id, Region, City, Email, AddressLine1, AddressLine2, Will_UID, WillCreated, WillLatest, UpdateDate, UpdateType)
select  Client_Id, ClientName, ClientSurname, TelephoneHome, TelephoneWork, TelephoneCellular, DOB, Gender, ClientIdNumber, Company_Id, Region, City, Email, AddressLine1, AddressLine2, Will_UID, WillCreated, WillLatest, @UpdateDate, @type + '_new'
from inserted

Answer 1

为此使用suser_name ()的system_user.

dbo如果您的用户处于sysadmin角色,则user_name()将返回.

Answer 2

User_Name()：http：//technet.microsoft.com/en-us/library/ms188014.aspx

句法

USER_NAME ( [ id ] )

如果省略id，则假定当前上下文中的当前用户。如果参数包含单词NULL，则将返回NULL。在调用EXECUTE AS语句后未指定ID的情况下调用USER_NAME时，USER_NAME返回模拟用户的名称。如果Windows主体通过组中的成员身份访问数据库，则USER_NAME返回Windows主体的名称而不是组。

在旁边：

我将您的触发代码更改为：

SET NOCOUNT ON;

INSERT INTO dbo.Client_Audit (Cliend_Id, ClientName, ..., UpdateDate, UpdateType)
SELECT Coalesce(i.Cliend_Id, d.Cliend_Id) As Cliend_Id
     , Coalesce(i.ClientName, d.ClientName) As ClientName
     , ...
     , Current_Timestamp As UpdateDate
     , CASE WHEN i.Cliend_Id IS NULL THEN 'D'
            WHEN d.Cliend_Id IS NULL THEN 'I'
            ELSE 'U'
       END As UpdateType
FROM   inserted As i
 FULL
  JOIN deleted As d
    ON d.Cliend_Id = i.Cliend_Id;

做同样的事情，但是以一种更简洁的方式（没有额外的逻辑和变量，只需一个语句）。

有任何问题都可以问！