用于嵌套有效负载 xml 的 Xquery

Question

这是我的输入 XML：

这是我修改后的 xml 数据作为输入

 <Input>
    <BIKey></BIKey>
    <BusinessObjects>
          <BusinessObject>
            <BusinessIdentifiers>
              <BusinessIdentifier>
                <BKey>BuCode</BKey>
                <BValue>CDC</BValue>
              </BusinessIdentifier>
              <BusinessIdentifier>
                <BKey>BuType</BKey>
                <BValue>123</BValue>
              </BusinessIdentifier>
              <BusinessIdentifier>
                <BKey>CsmNo</BKey>
                <BValue>857895</BValue>
              </BusinessIdentifier>
            </BusinessIdentifiers>
            <BusinessAttributes>
              <BusinessAttribute>
                <BKey>Version</BKey>
                <BValue>1</BValue> 
              </BusinessAttribute>
              <BusinessAttribute>
                <BKey>date</BKey>
                <BValue>2018-06-28</BValue>
              </BusinessAttribute>
            </BusinessAttributes>
          </BusinessObject>
          <BusinessObject>
            <BusinessIdentifiers>
              <BusinessIdentifier>
                <BKey>BuCode</BKey>
                <BValue>CDC</BValue>
              </BusinessIdentifier>
              <BusinessIdentifier>
                <BKey>BuType</BKey>
                <BValue>123</BValue>
              </BusinessIdentifier>
              <BusinessIdentifier>
                <BKey>CsmNo</BKey>
                <BValue>34567</BValue>
              </BusinessIdentifier>
            </BusinessIdentifiers>
            <BusinessAttributes>
              <BusinessAttribute>
                <BKey>Version</BKey>
                <BValue>1</BValue> 
              </BusinessAttribute>
              <BusinessAttribute>
                <BKey>date</BKey>
                <BValue>2018-06-28</BValue>
              </BusinessAttribute>
            </BusinessAttributes>
          </BusinessObject>      
        </BusinessObjects>
        </Input>

我想将以下输出 CDC|123|857895:CDC|123|34567 分配给 <BIKey>

我已经按照 Martin 的建议尝试了这个 Xquery，它实际上解决了我之前的问题，但与我之前的问题相比，我的 inputpayload 更多：

<Input>  
    For $BusinessObject in Input/BusinessObjects/BusinessObject[1]
    retrun


      <BIKey>{ string-join(Input/BusinessObjects/BusinessObject[1]/BusinessIdentifiers/BusinessIdentifier/BValue, '|') }</BIKey>


    </Input>

但我得到了这个输出

CDC|123|857895

请协助解决这个问题，因为我不确定在哪里循环有效负载以获得所需的输出。

谢谢

Answer 1

只需使用两次string-join，一个调用嵌套到另一个调用中：

<BIKey>
{
    string-join(
        Input/BusinessObjects/BusinessObject ! string-join(BusinessIdentifiers/BusinessIdentifier/BValue, '|'),
        ':'
    )
}
</BIKey>

这样，外部string-join 加入了由条形分隔的字符串序列，内部Input/BusinessObjects/BusinessObject ! string-join(BusinessIdentifiers/BusinessIdentifier/BValue, '|') 以冒号返回。

https://xqueryfiddle.liberty-development.net/eiQZDbi 的示例。

如果您没有 XQuery 3 或更高版本，您可以将 ! 的使用替换为

<Input>
    <BIKey>
    {
        string-join(
            for $bo in Input/BusinessObjects/BusinessObject return string-join($bo/BusinessIdentifiers/BusinessIdentifier/BValue, '|'),
            ':'
        )
    }
    </BIKey>
</Input>

https://xqueryfiddle.liberty-development.net/eiQZDbi/2