我在XML文件上有如下XQUERY 3.0,其中包含3个采购订单,包含5个项目:
for $PurchaseOrder in doc("C:\Users\thebluephantom\Desktop\order.xml")//PurchaseOrder
order by xs:integer($PurchaseOrder/Item/Quantity) ascending
return $PurchaseOrder/Items/Item/Quantity
不能按我的意愿返回结果。它有一个典型的嵌套结构,例如
<PurchaseOrders>
<PurchaseOrder PurchaseOrderNumber="99503" OrderDate="1999-10-20">
<Address Type="Shipping">
<Name>Ellen Adams</Name>
...
</Address>
<Address Type="Billing">
<Name>Tai Yee</Name>
<Street>8 Oak Avenue</Street>
...
</Address>
<DeliveryNotes>Please leave packages in shed by driveway. </DeliveryNotes>
<Items>
<Item PartNumber="872-AA">
<ProductName>Lawnmower</ProductName>
<Quantity>100</Quantity>
<USPrice>148.95</USPrice>
<Comment>Confirm this is electric</Comment>
</Item>
<Item PartNumber="926-AA">
<ProductName>Baby Monitor</ProductName>
<Quantity>20</Quantity>
<USPrice>39.98</USPrice>
<ShipDate>1999-05-21</ShipDate>
</Item>
</Items>
</PurchaseOrder>
<PurchaseOrder PurchaseOrderNumber="99505" OrderDate="1999-10-22">
...
我得到3个PO和5个订单项的结果:
<Quantity>100</Quantity>
<Quantity>20</Quantity>
<Quantity>1</Quantity>
<Quantity>1000</Quantity>
<Quantity>1</Quantity>
查看有关分组等的大量教程。我无法确定这是否可行。
答案 0 :(得分:1)
Order By
中的XPath缺少Items
轴,因此它不会选择任何内容,而是按文档顺序获取结果。如果更正了XPath,那么将在xs:integer()
调用中选择一系列值并将引发错误。
你可以像这样重写它:
for $quantity in
doc("C:\Users\thebluephantom\Desktop\order.xml")/PurchaseOrders/PurchaseOrder/Items/Item/Quantity
order by xs:integer($quantity) ascending
return $quantity