xquery - 如何基于集合获取计数并使用 XQuery 进行多元素词查询？

Question

尝试根据不同的过滤器计算一个集合中的汽车数量。即使我们看到多辆汽车满足要求，查询也返回计数 0。

fn:count(cts:search(fn:collection("com.cars"), cts:and-query((
    cts:element-word-query(xs:QName("exteriorColor"),  "red", "wildcarded" ),
    cts:element-word-query(xs:QName("interiorColor"),  "gray", "wildcarded" )
    cts:element-word-query(xs:QName("powerSteering"),  json:null(), "wildcarded" )
    ))))

测试数据:

{
      "id":1
      "carName":"Toyoto",
      "exteriorColor": "red",
      "interiorColor": "gray",
      "powerStreering": null
    }
    {
      "id":2
      "carName":"Toyoto",
      "exteriorColor": "blue",
      "interiorColor": "gray",
      "powerStreering": null
    }
    {
      "id":3
      "carName":"Toyoto",
      "exteriorColor": "red",
      "interiorColor": "gray",
      "powerStreering": "yes"
    }
    {
      "id":4
      "carName":"Toyoto",
      "exteriorColor": "white",
      "interiorColor": "gray",
      "powerStreering": null
    }
    {
      "id":5
      "carName":"Toyoto",
      "exteriorColor": "red",
      "interiorColor": "gray",
      "powerStreering": null
    } 

Answer 1

当您需要使用 cts:json-property-word-query 时，您正在使用 cts:element-word-query:https://docs.marklogic.com/cts:json-property-word-query

要测试 null，我相信你应该使用:

cts:json-property-value-query("propertyName", json:null())