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e xercise 2
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Create a DDL Trigger
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In this exercise, you create a DDL trigger to prevent dropping tables.
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Open a new query window, type, highlight, and execute the following code to create the DDL trigger:
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CREATE TRIGGER ddl_preventtabledrop ON DATABASE FOR DROP_TABLE AS PRINT 'Prevention of an accidental table drop.' PRINT 'You are attempting to drop a table in a production database.' PRINT 'If you really want to drop this table, please disable the DDL trigger.' PRINT 'Once the table has been dropped, please re-enable the DDL trigger.' ROLLBACK TRANSACTION GO
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Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views
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In the existing query window, type, highlight, and execute the following code to test the DDL trigger:
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CREATE TABLE dbo.Test (ID GO INT NOT NULL)
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SELECT * FROM dbo.Test GO
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DROP TABLE dbo.Test GO
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SELECT * FROM dbo.Test GO
In the existing query window, type, highlight, and execute the following code to disable the trigger and test that the drop of the table is successful:
DISABLE TRIGGER ddl_preventtabledrop ON DATABASE GO
DROP TABLE dbo.Test GO
SELECT * FROM dbo.Test GO
ENABLE TRIGGER ddl_preventtabledrop ON DATABASE GO
e xercise 3
Create a Logon Trigger
In this exercise, you create a logon trigger that can be used to lock out users from a SQL Server instance.
Open a new query window, type, highlight, and execute the following code to create a logon trigger:
CREATE TRIGGER ddl_preventlogon ON ALL SERVER FOR LOGON AS IF IS_SRVROLEMEMBER('sysadmin',ORIGINAL_LOGIN()) = 0 BEGIN ROLLBACK END GO
Lesson 3: Triggers
In the existing query window, type, highlight, and execute the following code to create a login for testing:
CREATE LOGIN TriggerTest WITH PASSWORD = '<InsertStrongPasswordHere>' GO
3. 4.
Attempt to log on using the account that you just created. Disable the trigger, and then attempt to log on again:
DISABLE TRIGGER ddl_preventlogon ON ALL SERVER GO
Lesson Summary
Triggers are specialized stored procedures that automatically execute in response to a DDL or DML event. You can create three types of triggers: DML, DDL, and logon triggers. A DML trigger executes when an INSERT, UPDATE, or DELETE statement for which the trigger is coded occurs. A DDL trigger executes when a DDL statement for which the trigger is coded occurs. A logon trigger executes when there is a logon attempt. You can access the inserted and deleted tables within a DML trigger. You can access the XML document provided by the EVENTDATA function within a DDL or logon trigger.
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Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views
Lesson 4: views
In 1, Data Retrieval, and 4, Using Additional Query Techniques, you learned about the various ways that a SELECT statement can be constructed to retrieve data. While some of the SELECT statements that you create are used for a specific, one-time activity, some SELECT statements are used again and again within your environment. Some of the queries that you reuse within your environment contain complex business logic, as well as complex T-SQL code that you do not want to have to re-create each time the query is needed. SQL Server allows you to store a SELECT statement within a database using an object called a view. In this lesson, you learn how to create views, modify data through a view, and index a view to improve query performance.
After this lesson, you will be able to
Create and alter views.
Estimated lesson time: 20 minutes
Creating a View
A view is simply a SELECT statement that has been given a name and stored in a database. The main advantage of a view is that once it s created, it acts like a table for any other SELECT statements that you want to write. The generic syntax to create a view is
CREATE VIEW [ schema_name . ] view_name [ (column [ ,...n ] ) ] [ WITH <view_attribute> [ ,...n ] ] AS select_statement [ WITH CHECK OPTION ] [ ; ]
The SELECT statement defined for the view can reference tables, other views, and functions, but cannot do any of the following:
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Contain the COMPUTE or COMPUTE BY clause Create a permanent or temporary table by using the INTO keyword Use an OPTION clause Reference a temporary table Reference any type of variable Contain an ORDER BY clause unless a TOP operator is also specified
The view can contain multiple SELECT statements so long as you use the UNION or UNION ALL operators. The view attributes that can be specified are ENCRYPTION, SCHEMABINDING, and VIEW_ METADATA. The ENCRYPTION and SCHEMABINDING attributes behave the same way as has been discussed already in this chapter. The VIEW_METADATA option is used when creating
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