Question

我有一个触发器可以防止有人使用Management Studio：

CREATE TRIGGER [TR_LOGON_APP]
ON ALL SERVER 
FOR LOGON
AS
BEGIN
   DECLARE @program_name NVARCHAR(128)
   DECLARE @host_name NVARCHAR(128)

   SELECT 
       @program_name = program_name, 
       @host_name = host_name
   FROM 
       sys.dm_exec_sessions AS c
   WHERE 
       c.session_id = @@spid

   IF @program_name LIKE '%Management%Studio%' 
   BEGIN
       RAISERROR('Access Denied.',16,1)
       ROLLBACK;
   END
END;

如何检查是否已存在，触发器将首先被丢弃？

我尝试过使用：

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'TR_LOGON_APP' AND [type] = 'TR')
BEGIN
      DROP TRIGGER [TR_LOGON_APP];
END;

和

IF EXISTS (SELECT * FROM sys.objects WHERE [name] = N'TR_LOGON_APP' AND [type] = 'TR')
BEGIN
      DROP TRIGGER [TR_LOGON_APP] ON ALL SERVER;
END;

但两者都返回错误：

System.Data.OleDb.OleDbException（0x80040E14）：已经存在一个名为＆＃39; TR_LOGON_APP＆＃39;的对象。在数据库中。

Answer 1

sys.objects目录视图包含数据库对象，而不包含服务器级对象。请改用sys.server_triggers：

IF EXISTS(SELECT 1 FROM sys.server_triggers WHERE name = N'TR_LOGON_APP')
BEGIN
    DROP TRIGGER TR_LOGON_APP ON ALL SERVER;
END;

DROP TRIGGER与ON ALL SERVER

1 个答案: