Power Query，使用表单数据发出 http POST 请求

Posted 2023-04-14

【中文标题】Power Query，使用表单数据发出 http POST 请求

【英文标题】：Power Query, make http POST request with form data

【发布时间】：2018-05-03 09:47:50

【问题描述】：

我有一个 REST API，它只接受带有表单数据的 POST 请求。

我知道在 Power Query 中 JSON 请求是这样的：

let
    url = "https://example.com",
    body = " ""first_param"": ""AAAAA"",  ""second_param"": ""BBBBBB""",    

    Source = Json.Document(Web.Contents(url,[ Headers = [#"Content-Type"="application/json"], Content = Text.ToBinary(body) ] ))
in
    Source

如何发送表单数据？？

【问题讨论】：

经过一些简短的谷歌搜索后，来自表单的 POST 请求以“application/x-www-form-urlencoded”或“multipart/form-data”格式在正文中发送。因此，我会查找如何生成您的数据以匹配其中一种格式，并将其放入 Web.Contents 请求的 Content 参数中。

【参考方案1】：

使用 Uri.BuildQueryString 和 Json.Document

let
    url = "https://example.com",
    body  = " ""first_param"": ""AAAAA"",  ""second_param"": ""BBBBBB""",
    Parsed_JSON = Json.Document(body),
    BuildQueryString = Uri.BuildQueryString(Parsed_JSON),
    Source = Json.Document(Web.Contents(url,[Headers = [#"Content-Type"="application/json"], Content = Text.ToBinary(BuildQueryString) ] ))
in
    Source

顺便说一句，你最好将body直接构造成record，避免文本字符串和双引号）

【讨论】：

您能否解释一下如何在正文中传递当前日期？就我而言，我将 fromDate 和 toDate 作为 first 和 second 参数。

DateTime.LocalNow() 等于 2013-03-08T14:22:42

或者类似= DateTime.ToText(DateTime.LocalNow(), "yyyy-MM-dd")等于2018-08-29

【参考方案2】：

我使用这种方式工作，授权类型是基本和编码的用户名和密码。

let
  url = "http://localhost:8091/_p/query/query/service?",

  body = "
    ""statement"": ""SELECT ROUND((SUM(src.DUR) / COUNT(.)), 0) AS 'Mean Screen Time per day' FROM \r\n(SELECT
                  SUM(TONUMBER(source.DURATION)) AS DUR, source.startDate AS DATE FROM \r\n(SELECT startDate, DATE_DIFF_STR(completionDate,
                  startDate, 'second') AS DURATION, attributes.screen AS SCREEN \r\nFROM data WHERE type_ = \""Event\"" AND type is NOT MISSING and
                  startDate IS NOT MISSING and completionDate IS NOT MISSING \r\nand completionDate > startDate and attributes.screen IS NOT
                  MISSING) source GROUP BY source.startDate) src"",
                  ""pretty"":true,""timeout"":""600s"",""profile"":""timings"",""scan_consistency":"not bounded"",""client_context_id"":""xyz""",

  Source = Json.Document(Web.Contents(
    url,[
        Timeout=#duration(0,0,120,0),
        Headers=[#"Authorization"="Basic YXB",#"Content-Type"="application/json"],
        Content=Text.ToBinary(body)
        ]
      )
    ),

  results = Source[results],

  #"Converted to Table" = Table.FromList(results, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
  #"Expanded Column1" = Table.ExpandRecordColumn(#"Converted to Table", "Column1", "MEAN _DURATION", "SCREEN","MEAN DURATION","SCREEN"),
  #"Changed Type" = Table.TransformColumnTypes(#"Expanded Column1","MEAN_DURATION", type number)

in

  #"Changed Type"

【讨论】：

我认为如果您将此代码编写为代码块作为答案会更有用。这将有助于将来其他用户测试您的答案。

你确定 :) @Mr.D