Creating Functions, Stored Procedures, and Triggers in .NET framework

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Creating Functions, Stored Procedures, and Triggers
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SELECT @ret = SUM(p.[Quantity]) FROM [Production].[ProductInventory] p WHERE p.[ProductID] = @ProductID AND p.[LocationID] = '6'; -- Only look at inventory in the -- misc storage. IF (@ret IS NULL) SET @ret = 0 RETURN @ret END;
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You can then use the function in a query, as follows:
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SELECT *, dbo.ufnGetStock(Production.Product.ProductID) FROM Production.Product;
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Table-Valued Functions
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Table-valued functions adhere to the same rules as scalar functions. The difference is that table-valued functions return a table as output. Therefore, they are generally used in the FROM clause of a SELECT statement and possibly joined to other tables or views. The general syntax of a table-valued function is as follows:
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CREATE FUNCTION [ schema_name. ( [ { @parameter_name [ AS ] [ [ = default ] } [ ,...n ] ] ) RETURNS @return_variable TABLE [ WITH <function_option> [ [ AS ] BEGIN function_body RETURN END [ ; ] ] function_name type_schema_name. ] parameter_data_type
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< table_type_definition > ,...n ] ]
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The following code shows an example of a table-valued function that takes a contact ID and returns contact information (contact ID, first name, last name, job title, and contact type) in the form of a table:
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CREATE FUNCTION [dbo].[ufnGetContactInformation](@ContactID int) RETURNS @retContactInformation TABLE ( -- Columns returned by the function: [ContactID] int PRIMARY KEY NOT NULL, [FirstName] [nvarchar](50) NULL, [LastName] [nvarchar](50) NULL, [JobTitle] [nvarchar](50) NULL, [ContactType] [nvarchar](50) NULL )
Lesson 1: Implementing Functions
AS -- Returns the first name, last name, job title, and contact type -- for the specified contact. BEGIN DECLARE @FirstName [nvarchar](50), @LastName [nvarchar](50), @JobTitle [nvarchar](50), @ContactType [nvarchar](50); -- Get common contact information. SELECT @ContactID = ContactID, @FirstName = FirstName, @LastName = LastName FROM [Person].[Contact] WHERE [ContactID] = @ContactID; SET @JobTitle = CASE -- Check for employee. WHEN EXISTS(SELECT * FROM [HumanResources].[Employee] e WHERE e.[ContactID] = @ContactID) THEN (SELECT [Title] FROM [HumanResources].[Employee] WHERE [ContactID] = @ContactID) -- Check for vendor. WHEN EXISTS(SELECT * FROM [Purchasing].[VendorContact] vc INNER JOIN [Person].[ContactType] ct ON vc.[ContactTypeID] = ct.[ContactTypeID] WHERE vc.[ContactID] = @ContactID) THEN (SELECT ct.[Name] FROM [Purchasing].[VendorContact] vc INNER JOIN [Person].[ContactType] ct ON vc.[ContactTypeID] = ct.[ContactTypeID] WHERE vc.[ContactID] = @ContactID) -- Check for store. WHEN EXISTS(SELECT * FROM [Sales].[StoreContact] sc INNER JOIN [Person].[ContactType] ct ON sc.[ContactTypeID] = ct.[ContactTypeID] WHERE sc.[ContactID] = @ContactID) THEN (SELECT ct.[Name] FROM [Sales].[StoreContact] sc INNER JOIN [Person].[ContactType] ct ON sc.[ContactTypeID] = ct.[ContactTypeID] WHERE [ContactID] = @ContactID) ELSE NULL END;
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Creating Functions, Stored Procedures, and Triggers
SET @ContactType = CASE -- Check for employee. WHEN EXISTS(SELECT * FROM [HumanResources].[Employee] e WHERE e.[ContactID] = @ContactID) THEN 'Employee' -- Check for vendor. WHEN EXISTS(SELECT * FROM [Purchasing].[VendorContact] vc INNER JOIN [Person].[ContactType] ct ON vc.[ContactTypeID] = ct.[ContactTypeID] WHERE vc.[ContactID] = @ContactID) THEN 'Vendor Contact' -- Check for store. WHEN EXISTS(SELECT * FROM [Sales].[StoreContact] sc INNER JOIN [Person].[ContactType] ct ON sc.[ContactTypeID] = ct.[ContactTypeID] WHERE sc.[ContactID] = @ContactID) THEN 'Store Contact' -- Check for individual consumer. WHEN EXISTS(SELECT * FROM [Sales].[Individual] i WHERE i.[ContactID] = @ContactID) THEN 'Consumer' END; -- Return the information to the caller. IF @ContactID IS NOT NULL BEGIN INSERT @retContactInformation SELECT @ContactID, @FirstName, @LastName, @JobTitle, @ContactType; END; RETURN; END; SELECT * FROM dbo.ufnGetContactInformation(1);
Deterministic vs. Nondeterministic Functions
When working with functions, it s important to know whether the function you are using is deterministic or nondeterministic. Deterministic functions return, for the same set of input values, the same value every time you call them. The SQL Server built-in function COS, which returns the trigonometric cosine of the specified angle, is an example of a deterministic function. In contrast, a nondeterministic function can return a different result every time you call it. An example of a nondeterministic function is the SQL Server built-in function GETDATE(), which returns the current system time and date. SQL Server also considers a function nondeterministic if the
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