如何修复 "invalid expression, current token ... not ended properly" 错误？

Question

这是我的数据

{
  "errorCode": null,
  "errorMessage": null,
  "responseItems": [
    {
      "personFirstName": "t16239d",
      "personLastName": "submitter 1",
      "hireDate": "20161106",
      "terminationDate": null,
      "startMonthYear": "01_2017",
      "endMonthYear": "12_2017",
      "staffTimeOffAllowances": [
        {
          "officeCode": null,
          "startMonthYear": null,
          "endMonthYear": null,
          "personId": null,
          "personCode": null,
          "allowancesIntotal": 10,
          "allowancesUsed": 0,
          "allowancesSubmitted": 0,
          "allowancesApproved": 0,
          "allowancesRemaining": 10,
          "timeOffType": {
            "id": 1284,
            "continent": "EU",
            "alphaId": "CA",
            "code": "SUM1",
            "description": "summer friday1",
            "account": "ADMIN1",
            "colourCode": "#CCCCCC",
            "visibility": "R",
            "approvalRequired": true,
            "commentRequired": false,
            "paid": true
          },
          "timeOffTypeWithoutAllowance": false,
          "proRataAllowanceData": false
        },
        {
          "officeCode": null,
          "startMonthYear": null,
          "endMonthYear": null,
          "personId": null,
          "personCode": null,
          "allowancesIntotal": 0,
          "allowancesUsed": 3,
          "allowancesSubmitted": 0,
          "allowancesApproved": 0,
          "allowancesRemaining": 3,
          "timeOffType": {
            "id": 1342,
            "continent": "EU",
            "alphaId": "CA",
            "code": "SICK",
            "description": "Sickness",
            "account": "SICK",
            "colourCode": "#CCCCCC",
            "visibility": "R",
            "approvalRequired": true,
            "commentRequired": false,
            "paid": true
          },
          "timeOffTypeWithoutAllowance": true,
          "proRataAllowanceData": false
        }
      ]
    }
  ]
}

我正在尝试提取具有 timeOffTypeWithoutAllowance = true.

的第一个 staffTimeOffAllowances 条目的 allowancesUsed 字段的值

Mu 当前尝试是：

staffTimeOffAllowances[?(@.timeOffTypeWithoutAllowance==true)].allowancesUsed[0]

它编译得很好，但是当我尝试预览它时，它失败了

invalid expression, current token staffTimeOffAlowances[?(@ not ended properly

我尝试了同一个表情的很多变体，但没有任何乐趣。有人可以告诉我我错过了什么吗？

Answer 1

基本json查询语言需要绝对表达式。我建议将您的查询停止在您想要的 JSON 属性之上一级，以便您可以将其用作字段表达式（使用 "leaf" 值需要一个特殊的字段表达式 - "." - 并可能产生不可预知的结果）。话虽如此，您应该对这个查询和字段映射没问题：

<queryString language="json">
    <![CDATA[responseItems.staffTimeOffAllowances(timeOffTypeWithoutAllowance == true)[0]]]>
</queryString>
<field name="allowancesUsed" class="java.lang.Integer"/>

从 JasperReports 6.3.1 开始，您可以使用更多 flexible/advanced jsonql 语言。只需将上面的 queryString 声明替换为：

这个：
```
<queryString language="jsonql">
    <![CDATA[..staffTimeOffAllowances.*(timeOffTypeWithoutAllowance == true)[0]]]>
</queryString>
```
此查询转换为："get the staffTimeOffAllowances property from anywhere, get its children that have timeOffTypeWithoutAllowance, select the first one"
或者这个：
```
<queryString language="jsonql">
    <![CDATA[..timeOffTypeWithoutAllowance(@val == true)^[0]]]>
</queryString>
```
此查询转换为："get the timeOffTypeWithoutAllowance property with a true value from anywhere, get its parents, select the first one"

重要说明：json 和 jsonql 是与 JsonPath 无关的自定义查询语言，尽管它们有一些相似之处。 json 是第一个（也是非常简单的）尝试提供一种查询 JSON 结构的方法，然后是 jsonql，它旨在取代 json，因为它提供了更多的功能和更可预测。

如何修复 "invalid expression, current token ... not ended properly" 错误？

How to fix "invalid expression, current token ... not ended properly" error?

json

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