快速提示:Power Query中的OData Feed Analyzer定制功能

Power BI和Excel的Power Query中的OData Feed Analyzer自定义功能

It’s been a while that I am working with 数据 data source in Power BI. One challenge that I almost always do not have a good understanding of the underlying data model. It can be really hard and time consuming if there is no one in the business that understands the underlying data model. I know, we can use $metadata to get the metadata schema from the 数据 feed, but let’不去那里。我不是OData专家,但是这里是像我这样的人的事,我使用的数据源不一定是专家,但我需要了解实体是什么,它们如何连接等…那如果我没有任何中小型企业(S对象 M东北黑钙土 Expert)谁可以帮助我?

因此,参与更多OData选项,让’s get into it.

The custom function below accepts an 数据 URL then it discovers all tables, their column count, their row count (more on this later), number and list of related tables, number and list of columns of type text, type number and Decimal.Type.

// fnODataFeedAnalyser
(ODataFeed as text) => 
  let
    Source = OData.Feed(ODataFeed),
    SourceToTable = Table.RenameColumns(
        Table.DemoteHeaders(Table.FromValue(Source)), 
        {{"Column1", "Name"}, {"Column2", "Data"}}
      ),
    FilterTables = Table.SelectRows(
        SourceToTable, 
        each Type.Is(Value.Type([Data]), Table.Type) = true
      ),
    SchemaAdded = Table.AddColumn(FilterTables, "Schema", each Table.Schema([Data])),
    TableColumnCountAdded = Table.AddColumn(
        SchemaAdded, 
        "Table Column Count", 
        each Table.ColumnCount([Data]), 
        Int64.Type
      ),
    TableCountRowsAdded = Table.AddColumn(
        TableColumnCountAdded, 
        "Table Row Count", 
        each Table.RowCount([Data]), 
        Int64.Type
      ),
    NumberOfRelatedTablesAdded = Table.AddColumn(
        TableCountRowsAdded, 
        "Number of Related Tables", 
        each List.Count(Table.ColumnsOfType([Data], {Table.Type}))
      ),
    ListOfRelatedTables = Table.AddColumn(
        NumberOfRelatedTablesAdded, 
        "List of Related Tables", 
        each 
          if [Number of Related Tables] = 0 then 
            null
          else 
            Table.ColumnsOfType([Data], {Table.Type}), 
        List.Type
      ),
    NumberOfTextColumnsAdded = Table.AddColumn(
        ListOfRelatedTables, 
        "Number of Text Columns", 
        each List.Count(Table.SelectRows([Schema], each Text.Contains([Kind], "text"))[Name]), 
        Int64.Type
      ),
    ListOfTextColunmsAdded = Table.AddColumn(
        NumberOfTextColumnsAdded, 
        "List of Text Columns", 
        each 
          if [Number of Text Columns] = 0 then 
            null
          else 
            Table.SelectRows([Schema], each Text.Contains([Kind], "text"))[Name]
      ),
    NumberOfNumericColumnsAdded = Table.AddColumn(
        ListOfTextColunmsAdded, 
        "Number of Numeric Columns", 
        each List.Count(Table.SelectRows([Schema], each Text.Contains([Kind], "number"))[Name]), 
        Int64.Type
      ),
    ListOfNumericColunmsAdded = Table.AddColumn(
        NumberOfNumericColumnsAdded, 
        "List of Numeric Columns", 
        each 
          if [Number of Numeric Columns] = 0 then 
            null
          else 
            Table.SelectRows([Schema], each Text.Contains([Kind], "number"))[Name]
      ),
    NumberOfDecimalColumnsAdded = Table.AddColumn(
        ListOfNumericColunmsAdded, 
        "Number of Decimal Columns", 
        each List.Count(
            Table.SelectRows([Schema], each Text.Contains([TypeName], "Decimal.Type"))[Name]
          ), 
        Int64.Type
      ),
    ListOfDcimalColunmsAdded = Table.AddColumn(
        NumberOfDecimalColumnsAdded, 
        "List of Decimal Columns", 
        each 
          if [Number of Decimal Columns] = 0 then 
            null
          else 
            Table.SelectRows([Schema], each Text.Contains([TypeName], "Decimal.Type"))[Name]
      ),
    #"Removed Other Columns" = Table.SelectColumns(
        ListOfDcimalColunmsAdded, 
        {
          "Name", 
          "Table Column Count", 
          "Table Row Count", 
          "Number of Related Tables", 
          "List of Related Tables", 
          "Number of Text Columns", 
          "List of Text Columns", 
          "Number of Numeric Columns", 
          "List of Numeric Columns", 
          "Number of Decimal Columns", 
          "List of Decimal Columns"
        }
      )
  in
    #"Removed Other Columns"
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