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UDFs, stored procedures, and triggers are the programmatic constructs used within SQL Server. You use UDFs to encapsulate complex functionality and return either a single value or a table variable. Functions cannot make changes that cause the state of the database or server to change. You use stored procedures to perform any programmatic actions on a server. Stored procedures, which can return scalar values or result sets, are the primary interface that applications should use to access any data within a database. Triggers are a special type of stored procedure that you use to execute code in response to specified actions. DML triggers execute in response to INSERT, UPDATE, and DELETE operations. DDL triggers execute in response to DDL commands.
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Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.
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data definition language (DDL) trigger data manipulation language (DML) trigger deterministic function function input parameter
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9 Review
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nested trigger nondeterministic function output parameter recursive trigger scalar function stored procedure table-valued function trigger
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Case Scenario: Creating Triggers, Functions, and Stored Procedures
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In the following case scenario you will apply what you ve learned in this chapter. You can find answers to these questions in the Answers section at the end of this book. Contoso Limited, a health care company located in Bothell, WA, has completed the initial design of its new patient claims database. All the table structures are defined, along with the necessary indexes, views, and partitioning. The company now has to implement all the rest of the parts of the application, including auditing all changes, calculating patient risk scores (a common calculation), and providing access to the data. What should Contoso be designing in the database
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To help you successfully master the exam objectives presented in this chapter, complete the following tasks.
Creating Functions
Practice 1
Within your existing databases, locate a calculation or result set that is generated on a frequent basis and that isn t straightforward to re-create each time. Encapsulate this code into a function and adjust your application code to use the function instead of using ad hoc SQL code.
9 Review
Creating Stored Procedures
Move all the ad hoc SQL code from your applications into stored procedures and call the procedures to perform the actions. Once all access (INSERT/UPDATE/DELETE/SELECT) is through stored procedures, remove all direct permissions to any base tables from all users.
Practice 1
Creating Triggers
Practice 1 Practice 2
Add triggers to your databases that audit changes made to data within your databases. Add triggers to your production SQL Server instances for all DROP operations that cause the action to be rolled back. Create DDL triggers for CREATE and ALTER actions that also roll back those operations. This process creates a structure that prevents any accidental changes to objects within any database on the server. To perform these operations, a sysadmin would have to disable the DDL trigger first. Make sure that you do not prevent yourself from altering a DDL trigger; if you do, you won t be able to make any changes.
Take a Practice Test
The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-431 certification exam content. You can set up the test so that it closely simulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.
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Practice tests
For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.
10
Working with Flat Files
A common task when working with a database is importing data from other sources. One of the most frequently used methods of transferring data is by using one or more flat files. A flat file is a file that is not hierarchical in nature or a file that contains data meant for a single table in the database. Using flat files for data import and export is beneficial because the format is often common between the source and destination systems. Flat files can also provide a layer of abstraction between the source and destination. This chapter covers the factors you need to consider before performing any data-load operations. It then covers the different methods you can use to efficiently import files into SQL Server, including bulk copy program (bcp), the BULK INSERT Transact-SQL command, the OPENROWSET Transact-SQL function, and the SQL Server Integration Services (SSIS) Import/Export Wizard.
Exam objectives in this chapter:
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