Lesson Summary in VS .NET

Make PDF-417 2d barcode in VS .NET Lesson Summary

Lesson Summary
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Stored procedures are stored batches of code that are compiled when executed. Procedures can be used to execute almost any valid command while also providing a security layer between a user and the tables within a database.
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Lesson Review
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The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
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9
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Creating Functions, Stored Procedures, and Triggers
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NOTE
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Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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1. Which stored procedure option regenerates the query plan every time a procedure is executed A. ENCRYPTION B. RECOMPILE C. VARYING D. EXECUTE AS
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Lesson 3: Implementing Triggers
Lesson 3: Implementing Triggers
A trigger is a specialized implementation of a Transact-SQL or CLR batch that automatically runs in response to an event within the database. You can create two types of triggers in SQL Server 2005: data manipulation language (DML) triggers and data definition language (DDL) triggers. DML triggers run when INSERT, UPDATE, or DELETE statements modify data in a specified table or view. DDL triggers, which run in response to DDL events that occur on the server such as creating, altering, or dropping an object, are used for database administration tasks such as auditing and controlling object access. In this lesson, you see how to create AFTER and INSTEAD OF DML triggers, how to identify and manage recursive and nested triggers, and how to create DDL triggers to perform administration tasks.
After this lesson, you will be able to:
Create DML triggers. Create DDL triggers. Identify recursive and nested triggers.
Estimated lesson time: 20 minutes
DML Triggers
Unlike stored procedures and functions, DML triggers are not stand-alone objects, and you cannot directly execute them. A DML trigger is attached to a specific table or view and defined for a particular event. When the event occurs, SQL Server automatically executes the code within the trigger, known as firing the trigger. The events that can cause a trigger to fire are INSERT, UPDATE, and DELETE operations. Triggers can fire in two different modes: AFTER and INSTEAD OF. An AFTER trigger fires after SQL Server completes all actions successfully. For example, if you insert a row into a table, a trigger defined for the INSERT operation fires only after the row passes all constraints defined by primary keys, unique indexes, constraints, rules, and foreign keys. If the insert fails any of these validations, SQL Server does not execute the trigger. You can define AFTER triggers only on tables. And you can create any number of AFTER triggers on a view or table. An INSTEAD OF trigger causes SQL Server to execute the code in the trigger instead of the operation that caused the trigger to fire. If you were to define an INSTEAD OF trigger on the table in the previous example, the insert would not be performed, so
9
Creating Functions, Stored Procedures, and Triggers
none of the validation checks would be performed. SQL Server would execute the code in the trigger instead. You can create INSTEAD OF triggers on views and tables. The most common usage is to use INSTEAD OF triggers on views to update multiple base tables through a view. You can define only one INSTEAD OF trigger for each INSERT, UPDATE, or DELETE event for a view or table. The code within a trigger can be composed of any statements and constructs valid for a batch, with some exceptions. Following is a brief list of some of the more important commands or constructs that you cannot use within a trigger:
Databases cannot be created, altered, dropped, backed up, or restored. Structural changes cannot be made to the table that caused the trigger to fire, such as CREATE/ALTER/DROP INDEX, ALTER/DROP TABLE, and so on.
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