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CHAPTER 8 MOVING LOGIC TO THE DATABASE
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2. Modify the stored procedure created in question 1 to include a parameter @CustomerID. Use the parameter in the WHERE clause of the query in the stored procedure. Test the stored procedure. 3. Create a stored procedure called dbo.usp_ProductSales that accepts a ProductID for a parameter and has an OUTPUT parameter that returns the total number sold for the product. Test the stored procedure.
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Within a database, you can create user-defined data types. User-defined data types (UDTs) are nothing more than native data types that you have given a specific name. This enables you to make sure that a particular type of column is consistently defined throughout the database. For example, databases often contain ZIP code and phone number columns as UDTs. Take a look at the UDTs defined for the AdventureWorks2008 database by navigating to Programmability Types User-Defined Data Types. If you double-click the Phone data type, you can see the graphical editor for the type (see Figure 8-20).
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Figure 8-20. The properties of the Phone data type The Phone data type is an NVARCHAR(25) that allows NULL values. The Binding section for Default and Rule are blank. In previous versions of SQL Server, you could create defaults and rules that were then applied to columns or UDTs. The binding features have been deprecated and should not be used. Once you have the data type defined, you can use it when defining columns in tables as any other data type. Here is the syntax for creating a UDT: CREATE TYPE <type name> FROM <native type and size> [NULL|NOT NULL] Listing 8-17 shows how to create a UDT. Type in and execute the code to learn more.
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CHAPTER 8 MOVING LOGIC TO THE DATABASE
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Listing 8-17. Creating a User-Defined Type USE [AdventureWorks2008]; GO IF EXISTS ( SELECT * FROM sys.types st JOIN sys.schemas ss ON st.schema_id = ss.schema_id WHERE st.name = N'CustomerID' AND ss.name = N'dbo') BEGIN DROP TYPE [dbo].[CustomerID]; END; GO CREATE TYPE dbo.CustomerID FROM INT NOT NULL; Now that the new UDT exists, you can use it when defining new tables. Another type of object introduced with SQL Server 2005 has a very close name, user-defined type. This new type must be created with a .NET language called a Common Language Runtime (CLR) data type. The new CLR types can contain multiple properties and can contain methods. Creating CLR types is beyond the scope of this book, but three CLR data types ship with SQL Server 2008. These three types are covered in 9.
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Triggers are a very powerful feature of SQL Server. As with most powerful things, they can also cause many problems. Triggers are like a special type of stored procedure that runs whenever data is modified. You can define triggers on tables that fire when new rows are inserted or when existing rows are updated or deleted. Triggers can insert data into auditing tables, roll back the current update, or even modify the row that caused the trigger to fire in the first place. Obviously, they can have an impact on performance, and care must be taken so that triggers are not used in a way that causes them to fire repeatedly because of one update. Any code within a trigger must be very efficient. The transaction that caused the trigger to fire cannot complete until the trigger is successfully completed. One common use of triggers is to enforce referential integrity, or the primary key/foreign key relationships between tables. For example, a trigger that fires when a customer is deleted from the customer table might delete all the orders for that customer. In actuality, this use of triggers is not necessary. Database designers can use foreign key constraints to take care of situations like this. Traditionally, triggers were defined only on tables. A new type of trigger is available in SQL Server 2005 that you can define on a database or on the server. These are called Data Definition Language (DDL) triggers. These fire when operations such as creating a table or adding a login are performed. They can be used to prevent these operations or log them, for example. Since this is a beginning book, it does not cover creating triggers. Just be aware that triggers often exist in databases and are frequently the cause of performance or logic problems that are difficult to track down.
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