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-- AFTER Trigger Example

-- Let's create a simple table 

CREATE TABLE AfterTrigTest

(

 FirstName varchar(15),

 LastName varchar(20),

 SSN varchar(11),

 State char(2)

)

-- Insert two rows into the table

INSERT INTO AfterTrigTest

VALUES

('Bob','James','484-52-6462','TN'),

('Ann','Lesley','492-67-5234','AZ')

-- Create an AFTER UPDATE trigger on the AfterTrigTest table

CREATE TRIGGER trAfterTrigTest_upd

ON AfterTrigTest

AFTER UPDATE

AS

BEGIN

PRINT  CONVERT(varchar(5),@@rowcount) + ' row(s) were updated.'

+ CHAR(13) + CHAR(13) + 'This rowcount was provided by the trAfterTrigTest trigger...'

--ROLLBACK TRANSACTION

END

-- Perform an update to test the trigger

UPDATE AfterTrigTest

SET FirstName='Robert'

WHERE FirstName='Bob'

select * from AfterTrigTest

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-- INSTEAD OF DML Trigger Example

CREATE TABLE dbo.TriggerTest

(

 FirstName varchar(15),

 LastName varchar(20),

 SSN char(11),

 State char(2)

)

-- Let's create an INSTEAD OF trigger that will 

-- fire when an INSERT occurs on this table

-- Note!

-- The INSTEAD OF trigger usually contains code 

-- to take some action before allowing the data insert to occur

-- or be refused...

CREATE TRIGGER io_TriggerEx

ON dbo.TriggerTest

INSTEAD OF INSERT

AS

BEGIN

  PRINT 'The INSTEAD OF trigger: io_TriggerEx has fired '

  PRINT 'The data contained in the INSERT command has not been added to the table'

END

select * from dbo.TriggerTest

-- Let's execute an INSERT and see the trigger in action

INSERT INTO dbo.TriggerTest

VALUES

('Bob','James','438-76-2362','TX')

-- Scalar UDF Example

-- We will create a function to provide a more 

-- descriptive result set for the EmailPromotion column

-- in the Person.EmailAddress table

SELECT * FROM Person.Person

-- Create a function named fnEmailPromo

-- It will accept EmailAddress as an input and

-- return a string value based on the int value

-- being passed in

-- We will use the function in a select statement

CREATE FUNCTION fnEmailPromo (@promo int)

RETURNS varchar(20)

AS

BEGIN

DECLARE @ret_promo varchar(20)

select @ret_promo=

	CASE 

		WHEN @promo=0 then 'None'

		WHEN @promo=1 then 'Local'

		WHEN @promo=2 THEN 'National'

		ELSE 'Not designated'

	END

	RETURN @ret_promo

END

-- Now, let's user our new fnEmailPromo function

-- Note that to call the new function we must include

-- dbo. in the name

SELECT FirstName + ' ' + Lastname Customer, dbo.fnEmailPromo(EmailPromotion) 'Promotion Type'

FROM Person.Person

ORDER BY LastName, FirstName

-- TVF Example

-- Here are the three tables we will be getting our data from

select top 1 * from person.person

select top 1 * from person.emailaddress

select top 1 * from humanresources.employee

-- Our TVF will return the names and email addresses of our

-- employees based on their gender

-- Let's create our TVF

CREATE FUNCTION dbo.fnGetEmail(@gender char(1))

RETURNS TABLE

AS

RETURN

	SELECT p.FirstName, p.Lastname,e.EmailAddress,em.Gender

	FROM person.person p

	JOIN person.EmailAddress e on p.BusinessEntityID=e.BusinessEntityID

	JOIN HumanResources.Employee em on e.BusinessEntityID=em.BusinessEntityID

	WHERE em.Gender=@gender

-- Let's use our TVF

SELECT * FROM dbo.fnGetEmail('m')

-- We can add a WHERE clause to get more creative with the results

SELECT * FROM dbo.fnGetEmail('m')

WHERE LastName LIKE 'D%'