new features sql server 2008-user defined table type and table valued parameters

In Sql Server 2008 you can pass a table variable in a stored procedure as a parameter. now you have the ability to send multiple rows of data in a stored procedure.one main advantage of that is that it will reduce the amount of round trips to the server. 

we are going to walk through the following example that explains the new features in sql server 2008. we can create a sample database. for example

create database sqlserver2008sample

let’s create a table- a customers table

CREATE TABLE [dbo].[Customers](

[Cust_ID] [int] NOT NULL,

[Cust_Name] [varchar](50) NOT NULL,

[Cust_Surname] [varchar](50) NOT NULL,

[Cust_Email] [varchar](50) NOT NULL)

we must insert some values in the table. we can do that by using a stored procedure

create procedure insertintocustomer(@Cust_ID int,@Cust_Name varchar(50),@Cust_Surname varchar(50),@Cust_Email varchar(50))

as

begin

insert into customers

values(

@Cust_ID, @Cust_Name,@Cust_Surname,@Cust_Email)

end

in order to insert values in the table we must execute that stored procedure multiple times. for example

execute insertintocustomer 1,‘robbie’,‘fowler’,‘rb@liverpool.com’

execute insertintocustomer 2,‘michael’,‘owen’,‘mo@liverpool.com’

now lets do the same by inserting table value parameters. 

first we create a user defined table data type.

create type customertype as table

(Cust_ID int,Cust_Name varchar(50),Cust_Surname varchar(50),Cust_Email varchar(50))

then we create the new stored procedure that takes the table type as a parameter.

create procedure newcustomer(@Customer_details customertype READONLY)

as

begin

insert into customers

select * from @Customer_details

end

lets create a variable of table data type

declare @customers customertype

lets fill the table variable by using insert statements

insert into @customers values (1,‘steven’,‘gerrard’,‘sg@liverpool.com’)

insert into @customers values (2,‘jamie’,‘caragher’,‘jc@liverpool.com’)

now we can execute the stored procedure by passing the table value parameter- @customers

execute newcustomer @Customers

if we now try a select statement in the customers table we will see the new values added.

hope it helps.