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The events and associated event groups that are valid for a DDL trigger can be found in the SQL Server Books Online article Event Groups for Use with DDL Triggers.
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While DML triggers have access to the inserted and deleted tables, DDL triggers have access to the EVENTDATA function. EVENTDATA returns the following Extensible Markup
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Lesson 3: Triggers
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Language (XML) document, which can be queried by using the value() method available through XQUERY:
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<EVENT_INSTANCE> <EventType>type</EventType> <PostTime>date-time</PostTime> <SPID>spid</SPID> <ServerName>name</ServerName> <LoginName>name</LoginName> <UserName>name</UserName> <DatabaseName>name</DatabaseName> <SchemaName>name</SchemaName> <ObjectName>name</ObjectName> <ObjectType>type</ObjectType> <TSQLCommand>command</TSQLCommand> </EVENT_INSTANCE>
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The XML document available varies based on the event type that caused the DDL trigger to fire. The XML schemas for each DDL event are documented at http://schemas.microsoft.com/ sqlserver. For example, for a CREATE_TABLE, ALTER_TABLE, or DROP_TABLE event, you can use the following query to retrieve the database, schema, object, and command executed:
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SELECT EVENTDATA().value ('(/EVENT_INSTANCE/DatabaseName)[1]','nvarchar(max)'), EVENTDATA().value ('(/EVENT_INSTANCE/SchemaName)[1]','nvarchar(max)'), EVENTDATA().value ('(/EVENT_INSTANCE/ObjectName)[1]','nvarchar(max)'), EVENTDATA().value ('(/EVENT_INSTANCE/TSQLCommand)[1]','nvarchar(max)')
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In addition to responding to DDL events, you can create a trigger to fire for a logon to the SQL Server instance. Logon triggers are fired after authentication succeeds but before the user session is actually established. You cannot return any messages to a user from within a logon trigger. The generic syntax for a logon trigger is
CREATE TRIGGER trigger_name ON ALL SERVER [ WITH <logon_trigger_option> [ ,...n ] ] { FOR | AFTER } LOGON AS { sql_statement [ ; ] [ ,...n ] | EXTERNAL NAME < method specifier > [ ; ] }
<logon_trigger_option> ::= [ ENCRYPTION ] [ EXECUTE AS Clause ]
Logon triggers are used to audit and restrict access. For example, you could limit the number of connections that a user is allowed to make to the instance. If you execute a ROLLBACK statement within a logon trigger, the connection to the instance terminates.
178 CHAPTER 5 Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views
Best PraCtiCes
DatabaSe Maintenance
One of the more difficult tasks that database administrators face, particularly with Web-based applications, is getting all the users out of a database so that maintenance can be performed. No matter how carefully you plan, you inevitably have unexpected connections created. As soon as you kill all the connections to the database, another connection shows up, leading you in an unending circle. One method to lock out access is to disable all the logins; however, you are changing the state of the login, and reenabling the login might cause policy checks to fail, thereby creating an unexpected outage. A better method is to create a logon trigger that rejects logon attempts during your maintenance window. Then, all you need to do is disable the logon trigger following maintenance to return access to normal.
exaM tiP
For the exam, make sure you know how to retrieve information from within a DDL trigger using the EVENTDATA function.
Quick check
1. What are the three types of triggers that can be created 2. How do you access information about the cause of an event within a DDL trigger
Quick check answers
1. You can create DML, DDL, and logon triggers. 2. You query the XML document returned by the EVENTDATA function within
DDL and logon triggers to retrieve information about the event that caused the trigger to fire. Each event has a different XML schema. All the SQL Server schemas are documented at http://schemas.microsoft.com/sqlserver.
Pr actice
creating triggers
In this practice, you create DML, DDL, and logon triggers.
e xercise 1
Create a DML Trigger
In this exercise, you create a DML trigger to maintain an audit trail of changes.
Open a new query window, type and execute the following code to create a basic audit trail table:
CREATE TABLE Production.ProductAuditTrail (AuditID AuditDate ChangeUser INT DATETIME SYSNAME IDENTITY(1,1), NOT NULL, NOT NULL,
Lesson 3: Triggers
ProductID
NOT NULL, NOT NULL, NOT NULL)
BeforeListPrice MONEY AfterListPrice GO MONEY
In the existing query window, type, highlight, and execute the following code to create an audit trigger:
CREATE TRIGGER tu_ProductAuditTrail ON Production.Product FOR UPDATE AS INSERT INTO Production.ProductAuditTrail (AuditDate, ChangeUser, ProductID, BeforeListPrice, AfterListPrice) SELECT GETDATE(), SUSER_SNAME(), i.ProductID, d.ListPrice, i.ListPrice FROM inserted i INNER JOIN deleted d ON i.ProductID = d.ProductID GO
In the existing query window, type, highlight, and execute the following code to test the audit trigger:
SELECT * FROM Production.ProductAuditTrail GO UPDATE Production.Product SET ListPrice = ListPrice + 1 WHERE ProductID = 514 GO SELECT * FROM Production.ProductAuditTrail GO
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