Xquery如何搜索布尔值

Question

我写了XQuery来搜索JSON文档。代码如下：

xquery version "3.1"
let $characters := fn:json-doc("pott.json")?characters?*
return
    document {
        <characters>
            {
                for $s in fn:distinct-values($characters?name)
                return
                    if ( $characters[?name eq $s]?house eq "Hufflepuff")
                    then
                        (
                        <characters>
                        <name>"{$s}"</name>
                        <datas>
                        <name>"{$characters[?name eq $s]?name}"</name>
                        <id>"{$characters[?name eq $s]?_id}"</id>
                        <deatheater>"{$characters[?name eq $s]?deathEater}"</deatheater>
                        <school>"{$characters[?name eq $s]?school}"</school>
                        </datas>
                        </characters>
                        )
                    else
                        ()
            }
            </characters>
    }

但是我也想添加一个布尔类型的搜索，例如：如果deathEater的字符值= false，则仅显示属于房屋Hufflepuff和deathEater = false的字符]。这是我的JSON文件：

    {
      "characters":[
         {
      "house":"Slytherin",
      "orderOfThePhoenix":false,
      "name":"Phineas Nigellus Black",
      "bloodStatus":"pure-blood",
      "deathEater":false,
      "dumbledoresArmy":false,
      "school":"Hogwarts School of Witchcraft and Wizardry",
      "role":"(Formerly) Headmaster of Hogwarts",
      "__v":0,
      "ministryOfMagic":false,
      "_id":"5a0fa6bbae5bc100213c2334",
      "species":"human"
     },
     {
      "house":"Slytherin",
      "orderOfThePhoenix":false,
      "name":"Regulus Black",
      "bloodStatus":"pure-blood",
      "deathEater":true,
      "dumbledoresArmy":false,
      "school":"Hogwarts School of Witchcraft and Wizardry",
      "__v":0,
      "ministryOfMagic":false,
      "_id":"5a0fa772ae5bc100213c2337",
      "species":"human"
     },
     {
      "house":"Gryffindor",
      "orderOfThePhoenix":true,
      "name":"Sirius Black",
      "bloodStatus":"pure-blood",
      "alias":"Padfoot",
      "deathEater":false,
      "dumbledoresArmy":false,
      "school":"Hogwarts School of Witchcraft and Wizardry",
      "animagus":"black dog",
      "__v":0,
      "ministryOfMagic":false,
      "_id":"5a0fa7dcae5bc100213c2338",
      "species":"human"
     },
{
      "house":"Hufflepuff",
      "orderOfThePhoenix":true,
      "name":"Amelia Bones",
      "bloodStatus":"unknown",
      "deathEater":false,
      "dumbledoresArmy":false,
      "school":"Hogwarts School of Witchcraft and Wizardry",
      "role":"Head, Department of Magical Law Enforcement",
      "__v":0,
      "ministryOfMagic":true,
      "_id":"5a0fa842ae5bc100213c2339",
      "species":"human"
     },
     {
      "house":"Hufflepuff",
      "orderOfThePhoenix":false,
      "name":"Susan Bones",
      "bloodStatus":"half-blood",
      "deathEater":false,
      "dumbledoresArmy":true,
      "school":"Hogwarts School of Witchcraft and Wizardry",
      "role":"student",
      "__v":0,
      "ministryOfMagic":false,
      "_id":"5a0fa86dae5bc100213c233a",
      "species":"human"
     }
        }
      ]
    }

您能帮我怎么做，我已经尝试了几种功能，但没有一个对我有用。

Answer 1

在XQuery中，使用函数true()和false()编写布尔值。您可以如下扩展条件：

Answer 2

使用