Lesson 1: Implementing Functions in .NET framework

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Lesson 1: Implementing Functions
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function calls a nondeterministic function or if the function calls an extended stored procedure. Whether a function is deterministic or not also determines whether you can build an index on the results the function returns and whether you can define a clustered index on a view that references the function. If the function is nondeterministic, you cannot index the results of the function, either through indexes on computed columns that call the function or through indexed views that reference the function.
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What are the two types of UDFs, and how are they used Scalar functions return a single value and are generally used in column lists and WHERE clauses. Table-valued functions return a table variable and are used in the FROM clause.
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Create a Function
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In this practice, you create a scalar function to return the model name for a product given a particular product ID. You then create a table-valued function to return the contents of the Product table for a given model ID. 1. Launch SQL Server Management Studio (SSMS), connect to your instance, open a new query window, and change the context to the AdventureWorks database. 2. Create and test the GetModelNameForProduct scalar function by executing the following code:
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CREATE FUNCTION dbo.GetModelNameForProduct (@ProductID int) RETURNS nvarchar(50) WITH EXECUTE AS CALLER AS BEGIN DECLARE @ModelName nvarchar(50) SELECT @ModelName = Production.ProductModel.Name FROM Production.Product INNER JOIN Production.ProductModel ON Production.Product.ProductModelID = Production.ProductModel.ProductModelID WHERE Production.Product.ProductID = @ProductID
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Creating Functions, Stored Procedures, and Triggers
RETURN(@ModelName) END; GO SELECT dbo.GetModelNameForProduct(717);
3. Create and test the table-valued function GetProductsForModelID by executing the following code:
CREATE FUNCTION dbo.GetProductsForModelID (@ProductModelID int) RETURNS @Products TABLE ( ProductID int NOT NULL, Name dbo.Name NOT NULL, ProductNumber nvarchar(25) NOT NULL, MakeFlag dbo.Flag NOT NULL, FinishedGoodsFlag dbo.Flag NOT NULL, Color nvarchar(15) NULL, SafetyStockLevel smallint NOT NULL, ReorderPoint smallint NOT NULL, StandardCost money NOT NULL, ListPrice money NOT NULL, Size nvarchar(5) NULL, SizeUnitMeasureCode nchar(3) NULL, WeightUnitMeasureCode nchar(3) NULL, Weight decimal(8, 2) NULL, DaysToManufacture int NOT NULL, ProductLine nchar(2) NULL, Class nchar(2) NULL, Style nchar(2) NULL, ProductSubcategoryID int NULL, ProductModelID int NULL, SellStartDate datetime NOT NULL, SellEndDate datetime NULL, DiscontinuedDate datetime NULL, rowguid uniqueidentifier NOT NULL, ModifiedDate datetime NOT NULL ) WITH EXECUTE AS CALLER AS BEGIN INSERT INTO @Products SELECT ProductID, Name, ProductNumber, MakeFlag, FinishedGoodsFlag, Color, SafetyStockLevel, ReorderPoint, StandardCost, ListPrice, Size, SizeUnitMeasureCode, WeightUnitMeasureCode, Weight, DaysToManufacture, ProductLine, Class, Style, ProductSubcategoryID, ProductModelID, SellStartDate, SellEndDate, DiscontinuedDate, rowguid, ModifiedDate FROM Production.Product WHERE Production.Product.ProductModelID = @ProductModelID
Lesson 1: Implementing Functions
RETURN END; GO SELECT * FROM dbo.GetProductsForModelID(6);
Lesson Summary
SQL Server lets you create two types of UDFs scalar and table-valued to encapsulate complex queries for reuse. Scalar functions return a single value. Table-valued functions return a table variable. Computed columns or views based on deterministic functions, which return the same value every time they are called, can be indexed. Those using nondeterministic functions, which can return different results every time they are called, cannot be indexed.
Lesson Review
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.
NOTE
Answers
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.
1. Which of the following are valid commands to use within a function A. UPDATE Table1 SET Column1 = 1 B. SELECT Column1 FROM Table2 WHERE Column2 = 5 C. EXEC sp_myproc D. INSERT INTO @var VALUES (1)
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Creating Functions, Stored Procedures, and Triggers
Lesson 2: Implementing Stored Procedures
Stored procedures are the most-used programmatic structures within a database. A procedure is simply a name associated with a batch of SQL code that is stored and executed on the 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. Not only do stored procedures enable you to control access to the database, they also let you isolate database code for easy maintenance instead of requiring you to find hard-coded SQL statements throughout an application if you need to make changes. In this lesson, you see how to create a stored procedure, recompile a stored procedure, and assign permissions to a role for a stored procedure.
After this lesson, you will be able to:
Create a stored procedure. Recompile a stored procedure. Assign permissions to a role for a stored procedure.
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