Question

这是我的第二篇文章，我希望你能帮助我。我发现了类似的问题，但要么它们稍有不同，要么我无法将解决方案转移到我的问题上。

我确实有以下来源：

<?xml version="1.0" encoding="UTF-8"?>
<goods>
    <item>
        <groupIdentification>001</groupIdentification>
        <measures>
            <measure type="piece">
                <value>100</value>
                <unit>PK</unit>
            </measure>
            <measure type="weight">
                <value>100</value>
                <unit>KG</unit>
            </measure>
        </measures>
    </item>
    <item>
        <groupIdentification>002</groupIdentification>
        <measures>
            <measure type="piece">
                <value>200</value>
                <unit>PK</unit>
            </measure>
            <measure type="weight">
                <value>200</value>
                <unit>KG</unit>
            </measure>
        </measures>
    </item>
    <item>
        <groupIdentification>001</groupIdentification>
        <measures>
            <measure type="piece">
                <value>300</value>
                <unit>PK</unit>
            </measure>
            <measure type="weight">
                <value>300</value>
                <unit>KG</unit>
            </measure>
        </measures>
    </item>
</goods>

基于不同的组识别值，我想生成一个<groupedItem>的实例。在<groupedItem>中我想引用<groupIdentification>（但只有一个值）并总结不同的度量或任何其他值，它们共享相同的组标识。

我想要实现的目标结构是：

<?xml version="1.0" encoding="UTF-8"?>
<goods>
    <groupedItem>
        <groupIdentification>001</groupIdentification>
        <measures>
            <measure type="piece">
                <value>400</value>
                <unit>PK</unit>
            </measure>
            <measure type="weight">
                <value>400</value>
                <unit>KG</unit>
            </measure>
        </measures>
    </groupedItem>
    <groupedItem>
        <groupIdentification>002</groupIdentification>
        <measures>
            <measure type="piece">
                <value>200</value>
                <unit>PK</unit>
            </measure>
            <measure type="weight">
                <value>200</value>
                <unit>KG</unit>
            </measure>
        </measures>
    </groupedItem>
</goods>

请帮我解释一下如何实现这一目标以及机制是什么。我有点难以告诉查询总结那些共享相同“分组元素”的东西。

提前致谢。

修改

如果我使用以下查询，我只会获得2 groupedItems，但我无法在较低级别继续。

xquery version "3.0";
<goods>
{
for $item in goods/item
let $group := $item/groupIdentification
group by $group 
return
<groupedItem>
    {
    for $groupIdentification in goods/item/groupIdentification
    (: this is where I fail to get the connection :)
    return
    <groupIdentification>{ data($groupIdentification) }</groupIdentification>
    }
    (: no need for measure here yet, first need to solve the problem itself :)
</groupedItem>
}
</goods>

我明白了：

<?xml version="1.0" encoding="UTF-8"?>
<goods>
<groupedItem>
    <groupIdentification>001</groupIdentification><groupIdentification>002</groupIdentification><groupIdentification>001</groupIdentification>
</groupedItem>
<groupedItem>
    <groupIdentification>001</groupIdentification><groupIdentification>002</groupIdentification><groupIdentification>001</groupIdentification>
</groupedItem>
</goods>

Answer 1

......但我在下层继续失败

您需要再次分组。除了unit之外，您可能还希望对@type进行分组。

示例...

XML输入（已修改为引入第二个单元）

<goods>
    <item>
        <groupIdentification>001</groupIdentification>
        <measures>
            <measure type="piece">
                <value>100</value>
                <unit>PK</unit>
            </measure>
            <measure type="weight">
                <value>220</value>
                <unit>LB</unit>
            </measure>
            <measure type="weight">
                <value>100</value>
                <unit>KG</unit>
            </measure>
        </measures>
    </item>
    <item>
        <groupIdentification>002</groupIdentification>
        <measures>
            <measure type="piece">
                <value>200</value>
                <unit>PK</unit>
            </measure>
            <measure type="weight">
                <value>200</value>
                <unit>KG</unit>
            </measure>
        </measures>
    </item>
    <item>
        <groupIdentification>001</groupIdentification>
        <measures>
            <measure type="piece">
                <value>300</value>
                <unit>PK</unit>
            </measure>
            <measure type="weight">
                <value>300</value>
                <unit>KG</unit>
            </measure>
            <measure type="weight">
                <value>661</value>
                <unit>LB</unit>
            </measure>
        </measures>
    </item>
</goods>

XQuery 3.0

xquery version "3.0";
<goods>{
for $item in /goods/item
let $key := $item/groupIdentification
group by $key 
order by $key
return
<groupedItem>
    <groupIdentification>{$key}</groupIdentification>
    <measures>{
    for $measure in $item/measures/measure
    let $type := $measure/@type
    let $unit := $measure/unit
    group by $type,$unit
    order by $type,$unit
    return
        <measure type="{$type}">{
        <value>{sum($measure/value)}</value>,
        <unit>{$unit}</unit>
        }</measure>
    }</measures>
</groupedItem>
}</goods>

<强>输出

<goods>
   <groupedItem>
      <groupIdentification>001</groupIdentification>
      <measures>
         <measure type="piece">
            <value>400</value>
            <unit>PK</unit>
         </measure>
         <measure type="weight">
            <value>400</value>
            <unit>KG</unit>
         </measure>
         <measure type="weight">
            <value>881</value>
            <unit>LB</unit>
         </measure>
      </measures>
   </groupedItem>
   <groupedItem>
      <groupIdentification>002</groupIdentification>
      <measures>
         <measure type="piece">
            <value>200</value>
            <unit>PK</unit>
         </measure>
         <measure type="weight">
            <value>200</value>
            <unit>KG</unit>
         </measure>
      </measures>
   </groupedItem>
</goods>

XQuery：按元素进行分组，并根据具有相同分组条件的元素进行计算

1 个答案: