代码如下：
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
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
)
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;
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;
责任编辑：小草
