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akashviradiya
New Member

Regarding GTFS data

can anyone help me to set up

1 REPLY 1
Vijay_A_Verma
Super User
Super User

Use below code to get data from GTFS....Copy the code in a blank query and replace https://developers.....with your link

let
    Source = Web.Contents("https://developers.google.com/transit/gtfs/examples/sample-feed.zip"),
    //Function Start - Credit - https://sql10.blogspot.com/2016/06/reading-zip-files-in-powerquery-m.html
    UnzipContents=(ZIPFile) =>
    let
        Header = BinaryFormat.Record([
            MiscHeader = BinaryFormat.Binary(14),
            BinarySize = BinaryFormat.ByteOrder(BinaryFormat.UnsignedInteger32, ByteOrder.LittleEndian),
            FileSize   = BinaryFormat.ByteOrder(BinaryFormat.UnsignedInteger32, ByteOrder.LittleEndian),
            FileNameLen= BinaryFormat.ByteOrder(BinaryFormat.UnsignedInteger16, ByteOrder.LittleEndian),
            ExtrasLen  = BinaryFormat.ByteOrder(BinaryFormat.UnsignedInteger16, ByteOrder.LittleEndian)    
        ]),
        HeaderChoice = BinaryFormat.Choice(
            BinaryFormat.ByteOrder(BinaryFormat.UnsignedInteger32, ByteOrder.LittleEndian),
            each if _ <> 67324752             // not the IsValid number? then return a dummy formatter
                then BinaryFormat.Record([IsValid = false, Filename=null, Content=null])
                else BinaryFormat.Choice(
                        BinaryFormat.Binary(26),      // Header payload - 14+4+4+2+2
                        each BinaryFormat.Record([
                            IsValid  = true,
                            Filename = BinaryFormat.Text(Header(_)[FileNameLen]),
                            Extras   = BinaryFormat.Text(Header(_)[ExtrasLen]),
                            Content  = BinaryFormat.Transform(
                                BinaryFormat.Binary(Header(_)[BinarySize]),
                                (x) => try Binary.Buffer(Binary.Decompress(x, Compression.Deflate)) otherwise null
                            )
                            ]),
                            type binary                   // enable streaming
                    )
        ),
        ZipFormat = BinaryFormat.List(HeaderChoice, each _[IsValid] = true),
        Entries = List.Transform(
        List.RemoveLastN( ZipFormat(ZIPFile), 1),
        (e) => [FileName = e[Filename], Content = e[Content] ]
        )
    in
        Table.FromRecords(Entries),
        //Function End
    Files = UnzipContents(Source)
in
    Files

 

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