1. TOP 表达式
SQL Server 2000的TOP是个固定值&＃xff0c;是不是觉得不爽&＃xff0c;现在改进了。
--前n名的订单declare &＃64;n int set &＃64;n &＃61; 10 select TOP(&＃64;n) * from Orders 2. 分页
不知各位过去用SQL Server 2000是怎么分页的&＃xff0c;大多都用到了临时表。SQL Server 2005一句话就支持分页&＃xff0c;性能据说也非常不错。
select * from(
select OrderId, Freight, ROW_NUMBER() OVER(order by Freight) as row from Orders
) a
where row between 20 and 30
不知各位过去用SQL Server 2000是怎么分页的&＃xff0c;大多都用到了临时表。SQL Server 2005一句话就支持分页&＃xff0c;性能据说也非常不错。
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没有异常&＃xff0c;T-SQL必须逐行检查错误代码&＃xff0c;对于习惯了try catch程序员&＃xff0c;2005是不是更加亲切&＃xff1a;
SET XACT_ABORT ON -- 打开 try功能
BEGIN TRY
begin tran
insert into Orders(CustomerId) values(-1)
commit tran
print &＃39;commited&＃39;
END TRY
BEGIN CATCH
rollback
print &＃39;rolled back&＃39;
END CATCH
BEGIN TRY
begin tran
insert into Orders(CustomerId) values(-1)
commit tran
print &＃39;commited&＃39;
END TRY
BEGIN CATCH
rollback
print &＃39;rolled back&＃39;
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&＃xff1a;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
6. 直接发布Web Service
这个比较酷&＃xff0c;.NET, IIS都不需要了&＃xff0c;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&＃61;started
as http(
path&＃61;&＃39;/sql/orders&＃39;,
AUTHENTICATION&＃61;(INTEGRATED),
ports&＃61;(clear)
)
for soap(
WebMethod &＃39;CustOrdersOrders&＃39;(
name&＃61;&＃39;Northwind.dbo.CustOrdersOrders&＃39;
),
wsdl&＃61;default,
database&＃61;&＃39;Northwind&＃39;,
namespace&＃61;&＃39;http://mysite.org/&＃39;
)
这个比较酷&＃xff0c;.NET, IIS都不需要了&＃xff0c;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&＃61;started
as http(
path&＃61;&＃39;/sql/orders&＃39;,
AUTHENTICATION&＃61;(INTEGRATED),
ports&＃61;(clear)
)
for soap(
WebMethod &＃39;CustOrdersOrders&＃39;(
name&＃61;&＃39;Northwind.dbo.CustOrdersOrders&＃39;
),
wsdl&＃61;default,
database&＃61;&＃39;Northwind&＃39;,
namespace&＃61;&＃39;http://mysite.org/&＃39;
)
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