Question

这是一个场景，我正在读取SQL Server上的数据及其在地图结构中的读取。问题是其中一个字段是JSON字符串，但预期的输出是JSON列表/对象。这是源数据（在ESB中读取）： 来源数据：

{
    price_distributor=44.000000000, 
    width=0E-12, 
    tax_status=taxable, 
    web_ref=OLG, 
    stock_qty=0E-9, 
    price_dealer=40.000000000, 
    sync_uid=11, 
    shipping_class_id=null, 
    shipping_required=true, 
    attributes=[{"parent_sku":"BBB_BBBBB","variation":1,"attid":18,"attname":"Fabric Type","attslug":"pa_fabric-type","attuid":837,"option":"Black","termid":219,"termslug":"black","termuid":854},{"parent_sku":"AAA_AAAAA","variation":1,"attid":18,"attname":"Fabric Type","attslug":"pa_fabric-type","attuid":837,"option":"Green","termid":233,"termslug":"green","termuid":853},{"parent_sku":"YYYY_YYYYY","variation":1,"attid":18,"attname":"Fabric Type","attslug":"pa_fabric-type","attuid":837,"option":"Blue","termid":232,"termslug":"blue","termuid":848},{"parent_sku":"XXXX_XXXX","variation":1,"attid":18,"attname":"Fabric Type","attslug":"pa_fabric-type","attuid":837,"option":"Red","termid":235,"termslug":"red","termuid":851}]
}

有问题的字段是属性，它的内容不是json数组，而是一个strigified数组。

以下是输出：

{
  "price_distributor": "44",
  "width": "0",
  "tax_status": "taxable",
  "web_ref": "OLG",
  "stock_qty": "0",
  "price_dealer": "40",
  "sync_uid": 11,
  "shipping_class_id": null,
  "shipping_required": true,
  "attributes": "[{\"parent_sku\":\"BBB_BBBBB\",\"variation\":1,\"attid\":18,\"attname\":\"Fabric Type\",\"attslug\":\"pa_fabric-type\",\"attuid\":837,\"option\":\"Black\",\"termid\":219,\"termslug\":\"black\",\"termuid\":854},{\"parent_sku\":\"AAA_AAAAA\",\"variation\":1,\"attid\":18,\"attname\":\"Fabric Type\",\"attslug\":\"pa_fabric-type\",\"attuid\":837,\"option\":\"Green\",\"termid\":233,\"termslug\":\"green\",\"termuid\":853},{\"parent_sku\":\"YYYY_YYYYY\",\"variation\":1,\"attid\":18,\"attname\":\"Fabric Type\",\"attslug\":\"pa_fabric-type\",\"attuid\":837,\"option\":\"Blue\",\"termid\":232,\"termslug\"

:\"blue\",\"termuid\":848},{\"parent_sku\":\"XXXX_XXXX\",\"variation\":1,\"attid\":18,\"attname\":\"Fabric Type\",\"attslug\":\"pa_fabric-type\",\"attuid\":837,\"option\":\"Red\",\"termid\":235,\"termslug\":\"red\",\"termuid\":851}]"
}

请参阅属性字段，而预期转化应为：

{
  "price_distributor": "44",
  "width": "0",
  "tax_status": "taxable",
  "web_ref": "OLG",
  "stock_qty": "0",
  "price_dealer": "40",
  "sync_uid": 11,
  "shipping_class_id": null,
  "shipping_required": true,
  "attributes": [
      {
          "parent_sku":"BBB_BBBBB",
          "variation":1,
          "attid":18,
          "attname":"Fabric Type",
          "attslug":"pa_fabric-type",
          "attuid":837,
          "option":"Black",
          "termid":219,
          "termslug":"black",
          "termuid":854
        },
        {
            "parent_sku":"AAA_AAAAA",
            "variation":1,
            "attid":18,
            "attname":"Fabric Type",
            "attslug":"pa_fabric-type",
            "attuid":837,
            "option":"Green",
            "termid":233,
            "termslug":"green",
            "termuid":853
        },
        {
            "parent_sku":"YYYY_YYYYY",
            "variation":1,
            "attid":18,
            "attname":"Fabric Type",
            "attslug":"pa_fabric-type",
            "attuid":837,
            "option":"Blue",
            "termid":232,
            "termslug":"blue",
            "termuid":848
        },
        {
            "parent_sku":"XXXX_XXXX",
            "variation":1,
            "attid":18,
            "attname":"Fabric Type",
            "attslug":"pa_fabric-type",
            "attuid":837,
            "option":"Red",
            "termid":235,
            "termslug":"red",
            "termuid":851
        }
    ]
}

我用于属性的数据编辑转换是这样的：

attributes: payload.attributes

我知道这不正确，但有没有一个运算符/函数可以帮助将字符串化的json转换为json对象/列表，比如json.parse（）？

非常感谢您的帮助。

谢谢，-Sam

Answer 1

这个问题可以通过使用＆＃34; read＆＃34;来解决。功能

您可以考虑使用类似以下DataWeave 1.0代码段的内容：

%dw 1.0
%var content = { 
    key1: "value1", 
    attributes: "{ \"stringKey\":\"stringValue\" }"
}
%output application/json
---
read(content.attributes, "application/json")

输出：

{
  "stringKey": "stringValue"
}

另请参阅read function in the official reference：

read函数返回解析content参数的结果   使用指定的mimeType阅读器。

第一个参数指向必须读取的内容，第二个参数指向   写它的格式。第三个可选参数列表   读者配置属性。

Answer 2

我明白了。以下是dataweave片段供参考：

attributes:  (payload.attributes replace /\[|\]|[\\]|\"/ with "" splitBy "}") 
    map using(attarr = $ replace /\{|,\{/ with "" splitBy ",")
        {
            parent_sku: (attarr[0] splitBy ":")[1],
            variation: (attarr[1] splitBy ":")[1],
            attid: (attarr[2] splitBy ":")[1],
            attname: (attarr[3] splitBy ":")[1],
            attslug: (attarr[4] splitBy ":")[1],
            attuid: (attarr[5] splitBy ":")[1],
            option: (attarr[6] splitBy ":")[1]//,
            termid: (attarr[7] splitBy ":")[1],
            termslug: (attarr[8] splitBy ":")[1],
            termuid: (attarr[9] splitBy ":")[1]
        },

将json字符串转换为mule中的json对象

2 个答案: