SQL Server 2005的几个新功能

2. 分页
不知各位过去用SQL Server 2000是怎么分页的，大多都用到了临时表。SQL Server 2005一句话就支持分页，性能据说也非常不错。

--按Freight从小到大排序，求20到30行的结果
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 Rank() over()----------结果：1,1,3格式
Dense_Rank() over()----结果：1,1,2,2格式
Row_Number() over()----结果：1,2,3,4
Ntile(3) over()--------结果：按3等进行划分

4. try ... catch

SET XACT_ABORT ON -- 打开 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. 通用表达式CTE
通过表达式可免除你过去创建临时表的麻烦。

--例子：结合通用表达式进行分页
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
特别，通过表达式还支持递归。

6.OUTPUT关键字

--定义一个表级变量，所有字段(包括自增长字段)都要定义
declare @InsertDetails Table
(
CustomerID int,
CustomerName nvarchar(50)
)
insert into customer output inserted.CustomerID ,inserted.CustomerName into
@Insertdetails
values('This is a test of putput keyword.')
select * from @insertdetails

--封装成存储过程

alert proc tt
(
@customerID nvarchar(50)
)
as
begin
declare @InsertDetails Table
(
CustomerID int,
CustomerName nvarchar(50)
)

insert into customer output inserted.CustomerID ,inserted.CustomerName into
@Insertdetails
values(@customerID)
select * from @insertdetails
end

--调用存储过程：
tt 'Hello everyone'

7. 直接发布Web Service
想要把store procedure变成Web Service就用这个吧，.NET, IIS都不需要，通过Windows 2003的HTTP Protocol Stack直接发布WebService,用这个功能需要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/'
)
Web Service就发布好了，敲入http://localhost/sql/orders?wsdl得到wsdl

待续...

SQL Server 2000没有异常，T-SQL必须逐行检查错误代码，对于习惯了try catch程序员，2005是不是更加亲切：