遍历 Json List in Excel Power Query 以检索记录

Question

我有一个强大的查询，它调用 Google 地图 API 并且 returns Json 像这样

let
    baseurl = "https://maps.googleapis.com/maps/api/geocode/json?",
    cellAddress = Excel.CurrentWorkbook(){[Name="Address"]}[Content]{0}[Column1],
    stepOneAdress = Replacer.ReplaceText(cellAddress, "Addrs: ", ""),
    noSpaceAdress = Replacer.ReplaceText(stepOneAdress, " ", "%20"),
    noCommasAdress = Replacer.ReplaceText(noSpaceAdress, ",", "%2C"),
    fullUrl = baseurl&"address="&noCommasAdress&"&key=AIzaSyCwcLo1bl8iTSWhU3vgHNuq3rJHbSGH-Pw",

    webdata = Web.Contents(fullUrl),

    response = Json.Document(webdata),
    results = response[results],
    data = results{0}
    
in
    data

数据是这样的

{
   "results" : [
      {
         "address_components" : [
            {
               "long_name" : "Steamboat Springs",
               "short_name" : "Steamboat Springs",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Routt County",
               "short_name" : "Routt County",
               "types" : [ "administrative_area_level_2", "political" ]
            },
            {
               "long_name" : "Colorado",
               "short_name" : "CO",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "United States",
               "short_name" : "US",
               "types" : [ "country", "political" ]
            },
            {
               "long_name" : "80487",
               "short_name" : "80487",
               "types" : [ "postal_code" ]
            }
         ],
         "formatted_address" : "Steamboat Springs, CO 80487, USA",
         "geometry" : {
            "bounds" : {
               "northeast" : {
                  "lat" : 40.5286781,
                  "lng" : -106.7801651
               },
               "southwest" : {
                  "lat" : 40.439399,
                  "lng" : -106.886848
               }
            },
            "location" : {
               "lat" : 40.4849769,
               "lng" : -106.8317158
            },
            "location_type" : "APPROXIMATE",
            "viewport" : {
               "northeast" : {
                  "lat" : 40.5286781,
                  "lng" : -106.7801651
               },
               "southwest" : {
                  "lat" : 40.439399,
                  "lng" : -106.886848
               }
            }
         },
         "place_id" : "ChIJYUZWCYF7QocRfc9uSNGjqBs",
         "types" : [ "locality", "political" ]
      }
   ],
   "status" : "OK"
}

然后我可以在另一个高级查询中读取该高级查询的“数据”，我试图在其中获取邮政编码数据。

let
    data = Coordinates,
    address_components = data[address_components],
    address_components1 = address_components{6}
in
    address_components1

address_component1（我知道可怕的名字，但仍在制作原型）是一个 Json 记录，然后被另一个查询使用。

但是 Json 列表中的值是硬编码的，如您所见，它是列表中的第六项。但是我发现我想要的邮政编码并不总是在列表的第六位。

记录中有一个类型列表，我想读取它并确定类型是否等于“postal_code”

我不知道如何遍历列表并检查每个项目。

我希望它是这样的

address_component1,
foreach(item in address_components){
   type_list = item["types"],
   if type_list = "postal_code"
      address_component1 = item,

这样循环可以吗？

Answer 1

如果，事实上，您的 json 与您显示的一样，关于：

单个邮政编码元素
包含一个邮政编码

您可以使用以下代码提取它：

首先将 address_components 提取到记录列表中
遍历每条记录，看types中的第一个元素是不是postal_code
如果是，那么return long_name

如果 json 包含多个 postal_code，可能需要不同的算法。

let
    Source = Json.Document(File.Contents("C:\Users\ron\Desktop\new 3.json")),

//extract the address_components
    address_components = Source[results]{0}[address_components],

//find the postal code and extract it
    postalCode=List.Accumulate(address_components,"", (state, current)=>
         if Record.Field(current,"types"){0} = "postal_code" then state & Record.Field(current,"long_name") else state)
in
    postalCode

postalCode 将包含邮政编码作为文本字符串。

遍历 Json List in Excel Power Query 以检索记录

Loop through Json List in Excel Power Query to retrieve record

excel

json

powerquery