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示例：使用 EXPLICIT 模式构造同级

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适用于：SQL ServerAzure SQL 数据库Azure SQL 托管实例

假定您要构造提供销售订单信息的 XML。 在此例中，<SalesPerson> 和 <OrderDetail> 元素是同级元素。 每个订单都有一个 <OrderHeader> 元素、一个 <SalesPerson> 元素以及一个或多个 <OrderDetail> 元素。

<OrderHeader SalesOrderID=... OrderDate=... CustomerID=... >
  <SalesPerson SalesPersonID=... />
  <OrderDetail SalesOrderID=... LineTotal=... ProductID=... OrderQty=... />
  <OrderDetail SalesOrderID=... LineTotal=... ProductID=... OrderQty=.../>
      ...
</OrderHeader>
<OrderHeader ...</OrderHeader>

以下 EXPLICIT 模式查询将构造此 XML。 查询将 <OrderHeader> 元素的 Tag 值指定为 1，将 <SalesPerson> 元素的此值指定为 2，将 <OrderDetail> 元素的此值指定为 3。 因为 <SalesPerson> 和 <OrderDetail> 是同级，所以该查询将 Parent 标记值都指定为 1，从而标识 <OrderHeader> 元素。

USE AdventureWorks2022;
GO
SELECT  1 as Tag,
        0 as Parent,
        SalesOrderID  as [OrderHeader!1!SalesOrderID],
        OrderDate     as [OrderHeader!1!OrderDate],
        CustomerID    as [OrderHeader!1!CustomerID],
        NULL          as [SalesPerson!2!SalesPersonID],
        NULL          as [OrderDetail!3!SalesOrderID],
        NULL          as [OrderDetail!3!LineTotal],
        NULL          as [OrderDetail!3!ProductID],
        NULL          as [OrderDetail!3!OrderQty]
FROM   Sales.SalesOrderHeader
WHERE     SalesOrderID=43659 or SalesOrderID=43661
UNION ALL
SELECT 2 as Tag,
       1 as Parent,
        SalesOrderID,
        NULL,
        NULL,
        SalesPersonID,
        NULL,
        NULL,
        NULL,
        NULL
FROM   Sales.SalesOrderHeader
WHERE     SalesOrderID=43659 or SalesOrderID=43661
UNION ALL
SELECT 3 as Tag,
       1 as Parent,
        SOD.SalesOrderID,
        NULL,
        NULL,
        SalesPersonID,
        SOH.SalesOrderID,
        LineTotal,
        ProductID,
        OrderQty
FROM    Sales.SalesOrderHeader SOH,Sales.SalesOrderDetail SOD
WHERE   SOH.SalesOrderID = SOD.SalesOrderID
AND     (SOH.SalesOrderID=43659 or SOH.SalesOrderID=43661)
ORDER BY [OrderHeader!1!SalesOrderID], [SalesPerson!2!SalesPersonID],
         [OrderDetail!3!SalesOrderID],[OrderDetail!3!LineTotal]
FOR XML EXPLICIT;

下面是部分结果：

<OrderHeader SalesOrderID="43659" OrderDate="2005-07-01T00:00:00" CustomerID="676">
  <SalesPerson SalesPersonID="279" />
  <OrderDetail SalesOrderID="43659" LineTotal="10.373000" ProductID="712" OrderQty="2" />
  <OrderDetail SalesOrderID="43659" LineTotal="28.840400" ProductID="716" OrderQty="1" />
  <OrderDetail SalesOrderID="43659" LineTotal="34.200000" ProductID="709" OrderQty="6" />
    ...
</OrderHeader>
<OrderHeader SalesOrderID="43661" OrderDate="2005-07-01T00:00:00" CustomerID="442">
  <SalesPerson SalesPersonID="282" />
  <OrderDetail SalesOrderID="43661" LineTotal="20.746000" ProductID="712" OrderQty="4" />
  <OrderDetail SalesOrderID="43661" LineTotal="40.373000" ProductID="711" OrderQty="2" />
  ...
</OrderHeader>

另请参阅