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Create and alter stored procedures. Create and alter user-defined functions (UDFs). Create and alter DML triggers. Create and alter DDL triggers. Create and deploy CLR-based objects. Implement error handling. Manage transactions. Create and alter views.
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Lessons in this chapter:
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Lesson 1: Stored Procedures 144 Lesson 2: User-Defined Functions Lesson 3: Triggers Lesson 4: Views
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before You begin
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To complete the lessons in this chapter, you must have:
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SQL Server 2008 installed The AdventureWorks database installed
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cLR ObjectS
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More info
You can create triggers, functions, and stored procedures using any supported CLR language. The creation and management of CLR objects is covered in 7, Extending Microsoft SQL Server Functionality with XML, Filestream, and SQLCLR.
real World
Michael Hotek
or decades, companies have been creating frameworks and code generation tools that are supposed to shield developers from needing to understand
databases or Structured Query Language (SQL). While many of these frameworks
and code generation tools have allowed developers to quickly create large volumes of database access code, unless the code generated undergoes significant modification, very little will perform well enough to meet the needs of business applications.
Programming Microsoft SQL Server with T-SQL User-Defined Stored Procedures, Functions, Triggers, and Views
At one company where I was working on a project, one of the developers couldn t wait to use one of these new code generators that was designed to shield the developers from needing to understand the databases they were using. Within the application, the developer wrote about four lines of code that would retrieve a single row from a table based on an input value for one of the columns of a table. This could have been done with a simple SELECT statement, which could have been encapsulated inside a stored procedure. However, what the application submitted to SQL Server created a function that contained the SELECT statement, a SELECT statement to access the function, code to drop the function at the end of the process, and 30 to 40 lines of T-SQL to perform error handling validation and ensure that the function was properly created and then dropped. Had the developer simply written the stored procedure and then called the stored procedure in the code, he would have needed to write a total of eight lines of code, and each user request would execute a total of three statements. Using the code generated by the code generator, however, required an object to be created and then destroyed along with the execution of more than 70 lines of code for each user request. Although the code generator did all the work so that the developer didn t have to worry about it, performance comparisons showed that the automatically generated code required six times as many resources and took 245 percent longer to execute than if the developer had just written a stored procedure. T-SQL is a very simple language to learn and has been around, with much the same syntax, for more than 50 years. Every time I hear about the next code generation tool that someone created to free developers from needing to understand how to access a database, the thing that always comes to mind is reinventing the wheel. T-SQL is a much simpler language than any of the development platforms in use. Just like the wheel, which has been around for more than 5,000 years with very little in the way of innovation, SQL will long outlive any application development language you will ever use, while at the same time being the most efficient way to access a relational database.
Before You Begin
Lesson 1: Stored Procedures
Stored procedures provide an abstraction layer that shields applications from the underlying database structure. As the backbone of any SQL Server application, stored procedures allow you to make changes to the database structure and manage performance without needing to rewrite applications or deploy application updates. In this lesson, you learn how to create stored procedures to provide the programmatic interface necessary for writing easily maintained and efficient database applications.
After this lesson, you will be able to:
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