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Develop U-SQL user-defined operators (UDOs)

  • Artikkeli

This article describes how to develop user-defined operators to process data in a U-SQL job.

Define and use a user-defined operator in U-SQL

To create and submit a U-SQL job

  1. From the Visual Studio menu, select File > New > Project > U-SQL Project.

  2. Select OK. Visual Studio creates a solution with a Script.usql file.

  3. From Solution Explorer, expand Script.usql, and then double-click Script.usql.cs.

  4. Paste the following code into the file:

    using Microsoft.Analytics.Interfaces;
using System.Collections.Generic;
namespace USQL_UDO
{
    public class CountryName : IProcessor
    {
        private static IDictionary<string, string> CountryTranslation = new Dictionary<string, string>
        {
            {
                "Deutschland", "Germany"
            },
            {
                "Suisse", "Switzerland"
            },
            {
                "UK", "United Kingdom"
            },
            {
                "USA", "United States of America"
            },
            {
                "中国", "PR China"
            }
        };
        public override IRow Process(IRow input, IUpdatableRow output)
        {
            string UserID = input.Get<string>("UserID");
            string Name = input.Get<string>("Name");
            string Address = input.Get<string>("Address");
            string City = input.Get<string>("City");
            string State = input.Get<string>("State");
            string PostalCode = input.Get<string>("PostalCode");
            string Country = input.Get<string>("Country");
            string Phone = input.Get<string>("Phone");
            if (CountryTranslation.Keys.Contains(Country))
            {
                Country = CountryTranslation[Country];
            }
            output.Set<string>(0, UserID);
            output.Set<string>(1, Name);
            output.Set<string>(2, Address);
            output.Set<string>(3, City);
            output.Set<string>(4, State);
            output.Set<string>(5, PostalCode);
            output.Set<string>(6, Country);
            output.Set<string>(7, Phone);
            return output.AsReadOnly();
        }
    }
}

  5. Open Script.usql, and paste the following U-SQL script:

    @drivers =
    EXTRACT UserID      string,
            Name        string,
            Address     string,
            City        string,
            State       string,
            PostalCode  string,
            Country     string,
            Phone       string
    FROM "/Samples/Data/AmbulanceData/Drivers.txt"
    USING Extractors.Tsv(Encoding.Unicode);

@drivers_CountryName =
    PROCESS @drivers
    PRODUCE UserID string,
            Name string,
            Address string,
            City string,
            State string,
            PostalCode string,
            Country string,
            Phone string
    USING new USQL_UDO.CountryName();

OUTPUT @drivers_CountryName
    TO "/Samples/Outputs/Drivers.csv"
    USING Outputters.Csv(Encoding.Unicode);

  6. Specify the Data Lake Analytics account, Database, and Schema.

  7. From Solution Explorer, right-click Script.usql, and then select Build Script.

  8. From Solution Explorer, right-click Script.usql, and then select Submit Script.

  9. If you haven't connected to your Azure subscription, you'll be prompted to enter your Azure account credentials.

  10. Select Submit. Submission results and job link are available in the Results window when the submission is completed.

  11. Select the Refresh button to see the latest job status and refresh the screen.

To see the output

  1. From Server Explorer, expand Azure, expand Data Lake Analytics, expand your Data Lake Analytics account, expand Storage Accounts, right-click the Default Storage, and then select Explorer.

  2. Expand Samples, expand Outputs, and then double-click Drivers.csv.

Next steps