SQL SERVER 2005中，新增加了许多新的特性，其中的DDL触发器是个不错的选择，根据资料初步学习如下，现整理之：
   在sql server 2000中，只能为针对表发出的 DML 语句（INSERT、UPDATE 和 DELETE）定义 AFTER 触发器。SQL Server 2005 可以就整个服务器或数据库的某个范围为 DDL 事件定义触发器。可以为单个 DDL 语句（例如，CREATE_TABLE）或者为一组语句（例如，DDL_DATABASE_LEVEL_EVENTS）定义 DDL 触发器。在该触发器内部，您可以通过访问 eventdata() 函数获得与激发该触发器的事件有关的数据。该函数返回有关事件的 XML 数据。每个事件的架构都继承了 Server Events 基础架构。
    比如，在SQL SERVER 2005中，建立一个叫DDLTrTest 的数据库，并且建立一个叫mytable的表
和Usp_Querymytable 的存储过程，如下所示
    DROP DATABASE [DDLTRTEST]
GO
CREATE DATABASE DDLTRTEST
GO
USE [DDLTRTEST]
GO
IF  EXISTS (SELECT * FROM SYS.OBJECTS
  WHERE OBJECT_ID = OBJECT_ID(N''[DBO].[MYTABLE]'')
  AND TYPE IN (N''U''))
DROP TABLE [DBO].[MYTABLE]
GO
CREATE TABLE MYTABLE(ID INT, NAME VARCHAR(100))
GO
INSERT INTO MYTABLE SELECT 1,''A''
INSERT INTO MYTABLE SELECT 2,''B''
INSERT INTO MYTABLE SELECT 3,''C''
INSERT INTO MYTABLE SELECT 4,''D''
INSERT INTO MYTABLE SELECT 5,''E''
INSERT INTO MYTABLE SELECT 6,''F''
GO
USE [DDLTrTest]
GO
IF  EXISTS (SELECT * FROM sys.objects WHERE object_id =
  OBJECT_ID(N''[dbo].[usp_querymytable]'')
  AND type in (N''P'', N''PC''))
DROP PROCEDURE [dbo].[usp_querymytable]
GO
CREATE PROC USP_QUERYMYTABLE
AS
SELECT * FROM MYTABLE
GO

   接下来定义一个DDL触发器如下
  
CREATE TRIGGER STOP_DDL_on_Table_and_PROC
ON DATABASE
FOR CREATE_TABLE,DROP_TABLE,
  ALTER_TABLE,CREATE_PROCEDURE,
  ALTER_PROCEDURE,DROP_PROCEDURE
AS
SELECT EVENTDATA().value
  (''(/EVENT_INSTANCE/TSQLCommand/CommandText)[1]'',
  ''nvarchar(max)'')
PRINT ''You are not allowed to CREATE,ALTER and DROP
  any Tables and Procedures''
ROLLBACK;

   接下来，我们尝试如下的操作：
  ALTER TABLE MYTABLE ADD X INT
 结果如下，出现错误提示
  ALTER TABLE MYTABLE ADD X INT
(1 row(s) affected)
You are not allowed to CREATE,ALTER and DROP any Tables and Procedures
Msg 3609, Level 16, State 2, Line 1
The transaction ended in the trigger. The batch has been aborted.

    再执行DROP的操作，同样触发警告

DROP TABLE MYTABLE
(1 row(s) affected)
You are not allowed to CREATE,ALTER and DROP any Tables and Procedures
Msg 3609, Level 16, State 2, Line 1
The transaction ended in the trigger. The batch has been aborted.
   因为我们的触发器规定了不能使用CREATE_TABLE,DROP_TABLE,
  ALTER_TABLE,CREATE_PROCEDURE,
  ALTER_PROCEDURE,DROP_PROCEDURE等操作。     如果我们要关掉这个触发器，可以这样做：  DISABLE TRIGGER STOP_DDL_ON_TABLE_AND_PROC
ON DATABASE   当然，我们要对整个服务器采取策略的话，也是很简单的，和上面的方法大致相同只不过将on database的参数改为on server,比如   CREATE TRIGGER STOP_DDL_on_Table_and_PROC
ON ALL SERVER
FOR CREATE_DATABASE,ALTER_DATABASE,DROP_DATABASE
AS
PRINT ''You are not allowed to CREATE,ALTER and DROP any Databases''
ROLLBACK;

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