MS SQL Server 2005 新功能 - 民間版01

http://www.cnblogs.com/wxukie/archive/2007/04/19/719528.html

1. TOP 表達式

SQL Server 2000的TOP是個固定值，是不是覺得不爽，現在改進了。

--前n名的訂單
declare @n int
set @n = 10
select TOP(@n) * from Orders

2. 分頁

不 知各位過 去用SQL Server 2000是怎麼分頁的，大多都用到了臨時表。SQL Server 2005一句話就支持分頁，性能據說也非常不錯。
select * from(
select OrderId, Freight, ROW_NUMBER() OVER(order by Freight) as row from Orders
) a
where row between 20 and 30

3. 排名

select * from(
select OrderId, Freight, RANK() OVER(order by Freight) as rank from Orders
) a
where rank between 20 and 30

4. try ... catch

SQL Server 2000沒有異常，T-SQL必須逐行檢查錯誤代碼，對於習慣了try catch程序員，2005是不是更加親切：

SET XACT_ABORT ON -- 打開 try功能
BEGIN TRY
begin tran
insert into Orders(CustomerId) values(-1)
commit tran
print 'commited'
END TRY
BEGIN CATCH
rollback
print 'rolled back'
END CATCH

5. 通用表達式CTE

通 過表達式可免除你過去創建臨時表的麻煩。 --例子：結合通用表達式進行分頁
WITH OrderFreight AS(
select OrderId, Freight, ROW_NUMBER() OVER(order by Freight) as row from Orders
)
select OrderId, Freight from OrderFreight where row between 10 and 20

6. 直接發佈Web Service

這 個比較酷，.NET, IIS都不需要了，通過Windows 2003的HTTP Protocol Stack直接發佈WebService,用這個功能需要Windows 2003 sp1
--DataSet CustOrdersOrders(string customerID)
CREATE ENDPOINT Orders_Endpoint
state=started
as http(
path='/sql/orders',
AUTHENTICATION=(INTEGRATED),
ports=(clear)
)
for soap(
WebMethod 'CustOrdersOrders'(
name='Northwind.dbo.CustOrdersOrders'
),

wsdl=default,
database='Northwind',
namespace='http://mysite.org/'
)