XML 中的 XQuery 简单递归查询子级到顶级父级

Question

Input xml

<req>
  <family>
    <person>
      <id>id1</id>
      <name>name1</name>
      <mother>mother1</mother>
      <age>age1</age>
    </person>
    <person>
      <id>id2</id>
      <name>name2</name>
      <mother>mother2</mother>
      <age>age2</age>
    </person>
    <person>
      <id>id4</id>
      <name>mother3</name>
      <mother>mother4</mother>
    </person>
    <person>
      <id>id3</id>
      <name>mother2</name>
      <mother>mother3</mother>
      <age>age3</age>
    </person>
  </family>
</req>

Could you please help me how to get the top parrent 'person' with existing element 'age' for every 'req/family/person'?

My follow xquery

declare function local:recons($family as element(*), $person as element(*))
    as element(*) {
    let $parrent := for $p in $family/person
    where $p/name=$person/mother
    return local:recons($family,$p)
    return
    <person>
    {$person/*}
    <parrent>{$parrent}</parrent>
    </person>
};

declare function xf:MyTest($inputXML as element(*))
    as element(*) {
       <res>
       <family>
       {
       for $person in $inputXML/family/person
       return local:recons($inputXML/family,$person)
       }
       </family>
       </res>
};

declare variable $inputXML as element(*) external;

xf:MyTest($inputXML)

Expected result

<res>
  <family>
    ...
    <person>
      <id>id2</id>
      <name>name2</name>
      <mother>mother2</mother>
      <age>age2</age>
      <parrent>
        <person>
          <id>id3</id>
          <name>mother2</name>
          <mother>mother3</mother>
          <age>age3</age>
          <parrent/>
        </person>
      </parrent>
    </person>
    ...
  </family>
</res>

Actual result

<res>
  <family>
    ...
    <person>
      <id>id2</id>
      <name>name2</name>
      <mother>mother2</mother>
      <age>age2</age>
      <parrent>
        <person>
          <id>id3</id>
          <name>mother2</name>
          <mother>mother3</mother>
          <age>age3</age>
          <parrent>
            <person>
              <id>id4</id>
              <name>mother3</name>
              <mother>mother4</mother>
              <parrent/>
            </person>
          </parrent>
        </person>
      </parrent>
    </person>
    ...
  </family>
</res>

I tried use ancestor and xpath like '$parrent//person[fn:exists(age)]', unsuccessful. I tried use ancestor and xpath like '$parrent//person[fn:exists(age)]', unsuccessful.

Answer 1

调整 where 子句你的 local:recons() 以确保你只选择 $parrent （该元素和变量不应该拼写为 parent 吗？）如果它有 age 并且它的 name 匹配 $person/mother

您可以使用谓词过滤器轻松做到这一点：

where $p[age]/name = $person/mother

应用于函数：

declare function local:recons($family as element(*), $person as element(*))
    as element(*) {
    let $parrent := for $p in $family/person
      where $p[age]/name = $person/mother
      return local:recons($family,$p)
    return
      <person>
        {$person/*}
        <parrent>{$parrent}</parrent>
      </person>
};

XML 中的 XQuery 简单递归查询子级到顶级父级

XQuery Simple Recursive Query child to top parent in XML

xml

recursion

xquery

parent-child

hierarchy