/* 订单是父 XML 元素 */
Select 1 as Tag, NULL as Parent,
Orders.OrderId AS [Order!1!OrderId],
Orders.OrderStatus AS [Order!1!OrderStatus],
Orders.OrderDate AS [Order!1!OrderDate],
Orders.SubTotal AS [Order!1!SubTotal],
Orders.Tax AS [Order!1!Tax],
Orders.ShippingHandling AS [Order!1!ShippingHandling],
Orders.ShipToName AS [Order!1!ShipToName],
Orders.ShipToAddressId AS [Order!1!ShipToAddressId],
NULL AS [OrderDetail!2!OrderDetailId],
NULL AS [OrderDetail!2!OrderId],
NULL AS [OrderDetail!2!ItemId],
NULL AS [OrderDetail!2!UnitPrice],
NULL AS [OrderDetail!2!Quantity]
from Orders
UNION ALL
/* 订单详细信息是子 XML 元素 */
select 2 as tag, 1 as parent,
Orders.OrderId AS [Order!1!OrderId],
NULL AS [Order!1!OrderStatus],
NULL AS [Order!1!OrderDate],
NULL AS [Order!1!SubTotal],
NULL AS [Order!1!Tax],
NULL AS [Order!1!ShippingHandling],
NULL AS [Order!1!ShipToName],
NULL AS [Order!1!ShipToAddressId],
OrderDetails.OrderDetailId AS [OrderDetail!2!OrderDetailId],
OrderDetails.OrderId AS [OrderDetail!2!OrderId],
OrderDetails.ItemId AS [OrderDetail!2!ItemId],
OrderDetails.UnitPrice AS [OrderDetail!2!UnitPrice],
OrderDetails.Quantity AS [OrderDetail!2!Quantity]
from Orders, OrderDetails
where Orders.OrderId = OrderDetails.OrderId
ORDER BY [Order!1!OrderId],[OrderDetail!2!OrderDetailId]
For XML EXPLICIT
写数据
以下示例中，通过 HTTP 请求提供表示层次行数据的 XML，然后将其传递到 ISAPI 模板中指定的 Transact SQL 代码。在存储过程中对 XML 进行语法分析，并进行相应的写入操作：
Create Procedure InsertOrder
@Order NVARCHAR(4000) = NULL,
@OrderId int Output
-
DECLARE @hDoc INT
DECLARE @PKId INT
BEGIN TRANSACTION
/* 将 XML 载入文档以进行分析 */
EXEC sp_xml_preparedocument @hDoc OUTPUT, @Order
/* 插入订单标头 */
INSERT Orders(CustomerId,
OrderDate,
ShipToName,
ShipToAddressId,
OrderStatus)
SELECT *
FROM OPENXML(@hDoc, ‘/NewDataSet/Orders‘)
WITH ( CustomerId int ‘CustomerId‘,
OrderDate Datetime ‘OrderDate‘,
ShipToName nvarchar(40) ‘ShipToName‘,
ShipToAddressId int ‘ShipToAddressId‘,
OrderStatus int ‘OrderStatus‘)
SELECT @PKId = @@IDENTITY
/* 插入订单详细信息 */
INSERT OrderDetails (OrderId,
ItemId,
UnitPrice,
Quantity)
SELECT @PKId as OrderId, ItemId, UnitPrice, Quantity
FROM OPENXML(@hDoc, ‘/NewDataSet/Details‘)
WITH ( ItemId int ‘ItemId‘,
UnitPrice money ‘UnitPrice‘,
Quantity int ‘Quantity‘)
/* 指定输出参数的值 */
Select @OrderId = @PKId
COMMIT TRANSACTION
/* 清除 XML 文档 */
EXEC sp_xml_removedocument @hDoc
总结
本文以及附带的示例介绍了有关数据转换的信息。通过数据转换，可以使用 SQL Server 2000 的 XML 功能将现有 Transact SQL 代码作为 Web 服务提供。本文集中讨论了传入和传出 Transact SQL 代码的数据与 SOAP 消息(在 Web 服务客户机和服务器之间使用)之间的转换。
这些解决方案的性能各异，并且受所传递的数据大小影响。在本系列后面的文章中，我们将对这些实现方法进行比较。
评估现有代码是否适合作为 Web 服务时，接口只不过是应当考虑的诸多因素之一。应考虑的其它因素包括安全性(包括授权、身份验证和加密)、事务模型、状态模型、返回错误和结果的方式，以及代码是同步还是异步执行，等等。
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