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DDL 触发器是一种特殊的触发器，它在响应数据定义语言 (DDL) 语句时触发。它们可以用于在数据库 中执 行管理 任务，例如，审核以 及规范数据库操作。
DDL 触发器在 CREATE 、 ALTER 、 DROP 和其他 DDL 语句上操作。它们用于执行管理任务，并强制影响数据库的业务规则。它们应用于数据库或服务器 中某 一类型的所有命令。
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数据库作用域的 DDL 语句——能够审计的相关类别
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服务器作用域的 DDL 语句——能够审计的相关类别
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-- 创建一张审计表，也可以为每类审计定制相关审计表
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CREATE TABLE dbo.AuditEventsTable
(
???????? ID??????????????????????? INT? NOT NULL IDENTITY,
???????? EventType????????????????? SYSNAME NOT NULL,??????
???????? PostTime????????? DATETIME NOT NULL,
???????? SPID?????????????????? SYSNAME NOT NULL,
???????? ServerName????????????? SYSNAME NOT NULL,
???????? LoginName??????????????? SYSNAME NOT NULL,
???????? UserName???????????????? SYSNAME NOT NULL,??????
???????? DatabaseName???????????????? SYSNAME NOT NULL,??????
???????? SchemaName?????????? SYSNAME NOT NULL,
???????? ObjectName????????????? SYSNAME NOT NULL,
???????? ObjectType??????????????? SYSNAME NOT NULL,
???????? CommandText????????? SYSNAME NOT NULL,??????
???????? EventData???????????????? XML NOT NULL,
???????? Flag??????????????????? INT,
???????? MSG??????????????????????????? VARCHAR(500),
???????? CONSTRAINT PK_AuditDDLEvents PRIMARY KEY(ID)
);
GO
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-- 所有审计数据均存在在一个 XML 中，相关结构如下
EVENTDATA 数据构成
<EVENT_INSTANCE>
? <EventType>CREATE_TABLE</EventType>
? <PostTime>2010-03-17T15:59:46.687</PostTime>
? <SPID>57</SPID>
? <ServerName>SQLSERVER/TEST2005</ServerName>
? <LoginName>sa</LoginName>
? <UserName>dbo</UserName>
? <DatabaseName>AdventureWorks</DatabaseName>
? <SchemaName>dbo</SchemaName>
? <ObjectName>TETS</ObjectName>
? <ObjectType>TABLE</ObjectType>
? <TSQLCommand>
??? <SetOptions ANSI_NULLS="ON" ANSI_NULL_DEFAULT="ON" ANSI_PADDING="ON" QUOTED_IDENTIFIER="ON" ENCRYPTED="FALSE" />
??? <CommandText>CREATE TABLE TETS(AA VARCHAR(20))</CommandText>
? </TSQLCommand>
</EVENT_INSTANCE>
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-- 根据每种审计，创建相应的审计触发器，该触发器可以基于数据库也可以基于服务器
ALTER TRIGGER TRI_AUDIT_CREATE_TABLE ON DATABASE FOR CREATE_TABLE
AS
DECLARE @EventData XML;
DECLARE @ObjectName SYSNAME;
DECLARE @MSG VARCHAR(500);
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SET @EventData=EVENTDATA();
SET @ObjectName=
@EventData.value('(/EVENT_INSTANCE/SchemaName)[1]','SYSNAME')+'.'+
@EventData.value('(/EVENT_INSTANCE/ObjectName)[1]','SYSNAME');
--此处可以进行相关审核
IF OBJECTPROPERTY(OBJECT_ID(@ObjectName),'TableHasPrimaryKey')=0
BEGIN
???????? SET @MSG='Table '+@ObjectName+' does not contain a primary key,You can''t create it';
???????? RAISERROR(@MSG,16,1);
???????? ROLLBACK
/*
???????? INSERT INTO dbo. AuditEventsTable
???????? (EventType,PostTime,SPID,ServerName,LoginName,UserName,DatabaseName,
???????? ? SchemaName,ObjectName,ObjectType,CommandText,EventData,Flag,MSG
???????? )
???????? VALUES
???????? (
???????? ? @EventData.value('(/EVENT_INSTANCE/EventType)[1]','VARCHAR(23)'),
???????? ? @EventData.value('(/EVENT_INSTANCE/PostTime)[1]','SYSNAME'),
???????? ? @EventData.value('(/EVENT_INSTANCE/SPID)[1]',
???????? ? @EventData.value('(/EVENT_INSTANCE/ServerName)[1]',
???????? ? @EventData.value('(/EVENT_INSTANCE/LoginName)[1]',
???????? ? @EventData.value('(/EVENT_INSTANCE/UserName)[1]',
???????? ? @EventData.value('(/EVENT_INSTANCE/DatabaseName)[1]',
???????? ? @EventData.value('(/EVENT_INSTANCE/SchemaName)[1]',
???????? ? @EventData.value('(/EVENT_INSTANCE/ObjectName)[1]',
???????? ? @EventData.value('(/EVENT_INSTANCE/TSQLCommand/CommandText)[1]',
???????? ? @EventData.value('(/EVENT_INSTANCE/ObjectType)[1]',?
???????? ? @EventData,
???????? ? 0,
???????? ? @MSG
???????? );
*/
???????? RETURN;
END
ELSE
???????? -- 记录成功日志
???????? INSERT INTO dbo. AuditEventsTable
???????? (EventType,Flag
???????? )
???????? VALUES
???????? (
???????? ? @EventData.value('(/EVENT_INSTANCE/EventType)[1]',
???????? ? 1
???????? );
GO
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-- 进行相关测试
create table test(a varchar(20))
SELECT * FROM dbo. AuditEventsTable
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参考：
ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.zh-CHS/tsqlref9/html/27569888-f8b5-4cec-a79f-6ea6d692b4ae.htm
http://blog.csdn.net/baoqiangwang/archive/2009/10/19/4700605.aspx
（编辑：李大同）
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