在 Xquery 中使用 where 条件嵌套 for 循环

nested for loop with where condition in Xquery

我需要从以下示例中过滤标签值 XML。

<ClinicalDocument xmlns="urn:hl7-org:v3">
    <id root="3930E379-5C54-477D-8DB2-F6C92BC08C691" />
    <component>
        <structuredBody>
            <component>
                <section>
                    <templateId root="1.3.6.1.4.1.19376.1.5.3.1.3.4"/>
                    <code code="10164-2" codeSystem="2.16.840.1.113883.6.1" 
          codeSystemName="LOINC" displayName="HISTORY OF PRESENT ILLNESS"/>
                    <title>HISTORY OF PRESENT ILLNESS</title>
                    <text>Patient slipped and fell on ice, twisting her ankle as she fell.
    </text>
                </section>
            </component>
            <component>
                <section>
                    <templateId root="1.3.6.1.4.1.19376.1.5.3.1.3.5"/>
                    <code code="10164-3" codeSystem="2.16.840.1.113883.6.12" 
          codeSystemName="LOINC1" displayName="DEMO"/>
                    <title>DEMO HISTORY OF PRESENT ILLNESS</title>
                    <text>DEMO Patient slipped and fell on ice, twisting her ankle as she fell.
    </text>
                </section>
            </component>
        </structuredBody>
    </component>
</ClinicalDocument>

我的 collection 中有很多这样的文件(我正在使用 eXits-db),我需要根据 <id> 标签中的 'root' 属性进行过滤,并且'root' 属性在 <templateId> 标签中。而我需要的结果只是 <title> 文本值。

以下是查询 i tried.But 显示了所有标题值(不是符合我的条件的那个)。

xquery version "3.0";
declare namespace d = "urn:hl7-org:v3";
(
    for $prod in collection("/db/netspectivedb/")/d:ClinicalDocument
    where $prod/d:id/@root/string()='3930E379-5C54-477D-8DB2-F6C92BC08C691' 
        and $prod/d:component/d:structuredBody/d:component/d:section/d:templateId/@root/string()='1.3.6.1.4.1.19376.1.5.3.1.3.4'
    return  $prod/d:component/d:structuredBody/d:component/d:section/d:title/text()
)

问题是,您的 XQuery 中的 $prod 引用了 ClinicalDocument,这对于您的目的而言不够具体。您想在 structuredBody 中遍历 componentsection 而不是开始,例如 :

declare namespace d = "urn:hl7-org:v3";
(
    for $section in collection("/db/netspectivedb/")/d:ClinicalDocument[d:id/@root eq '3930E379-5C54-477D-8DB2-F6C92BC08C691']/d:component/d:structuredBody/d:component/d:section
    where $section/d:templateId/@root eq '1.3.6.1.4.1.19376.1.5.3.1.3.4'
    return  $section/d:title/text()
)

或根据您的具体要求使用嵌套 for。在这种情况下,嵌套 for 也变得更具可读性:

declare namespace d = "urn:hl7-org:v3";
(
    for $prod in collection("/db/netspectivedb/")/d:ClinicalDocument
    for $section in $prod/d:component/d:structuredBody/d:component/d:section
    where $prod/d:id/@root eq '3930E379-5C54-477D-8DB2-F6C92BC08C691' 
        and $section/d:templateId/@root eq '1.3.6.1.4.1.19376.1.5.3.1.3.4'
    return  $section/d:title/text()
)

我使用 eq 而不是上面的 =,因为我们打算进行 值比较 (阅读更多:https://developer.marklogic.com/blog/comparison-operators-whats-the-difference

您可以使用单个 XPath 表达式实现相同的目的:

declare namespace d = "urn:hl7-org:v3";
collection("/db/netspectivedb/")/
  d:ClinicalDocument[d:id/@root eq '3930E379-5C54-477D-8DB2-F6C92BC08C691']/
  d:component/d:structuredBody/d:component/
  d:section[d:templateId/@root eq '1.3.6.1.4.1.19376.1.5.3.1.3.4']/d:title/text()