Dynamic Result Set Examples

data.cs

using System.Collections.Generic;
using System.Data;
using ServiceStack;
using ServiceStack.OrmLite;
using ServiceStack.DataAnnotations;

public class Artist
{
    public int Id { get; set; }
    public string Name { get; set; }
    
    [Reference]
    public List<Track> Tracks { get; set; }
    public override string ToString() => Name;
}

public class Track
{
    [AutoIncrement]
    public int Id { get; set; }
    public string Name { get; set; }
    public int ArtistId { get; set; }
    public string Album { get; set; }
    public int Year { get; set; }
    public override string ToString() => Name;
}

var Artists = new [] {
    new Artist { 
        Id = 1, Name = "Faith No More", 
        Tracks = new List<Track> { 
            new Track { Name = "Everythings Ruined", Album = "Angel Dust", Year = 1992 },
            new Track { Name = "Ashes to Ashes", Album = "Album of the Year", Year = 1997 },
        }
    },
    new Artist { 
        Id = 2, Name = "Live", 
        Tracks = new List<Track> { 
            new Track { Name = "Lightning Crashes", Album = "Throwing Copper", Year = 1994 },
            new Track { Name = "Lakini's Juice", Album = "Secret Samadhi", Year = 1997 },
        }
    },
    new Artist { 
        Id = 3, Name = "Nirvana", 
        Tracks = new List<Track> { 
            new Track { Name = "Smells Like Teen Spirit", Album = "Nevermind", Year = 1991  },
            new Track { Name = "Heart-Shaped Box", Album = "In Utero", Year = 1993 },
        }
    },
    new Artist { 
        Id = 4, Name = "Pearl Jam", 
        Tracks = new List<Track> { 
            new Track { Name = "Alive", Album = "Ten", Year = 1991 },
            new Track { Name = "Daughter", Album = "Vs", Year = 1993 },
        }
    },
};

IDbConnection CreateArtistAndTrackTablesWithData(IDbConnection db)
{
    db.DropAndCreateTable<Artist>();
    db.DropAndCreateTable<Track>();
    Artists.Each(x => db.Save(x, references:true));
    return db;
}

main.cs

using System;
using System.Linq;
using System.Collections.Generic;
using ServiceStack;
using ServiceStack.Text;
using ServiceStack.OrmLite;
using ServiceStack.OrmLite.Sqlite;

var dbFactory = new OrmLiteConnectionFactory(":memory:", SqliteDialect.Provider);
var db = CreateArtistAndTrackTablesWithData(dbFactory.OpenDbConnection());

var aggregates = db.Select<List<object>>(
    db.From<Track>().Select("COUNT(*), MIN(Year), MAX(Year)")).First();
"List<object> Aggregates: {0}".Print(aggregates.Dump());

var keyValuePairs = db.Select<Dictionary<string, object>>(
    db.From<Track>().Select("COUNT(*) Total, MIN(Year) Min, MAX(Year)")).First();

"Dictionary<string,object> Aggregates: {0}".Print(keyValuePairs.Dump());

class Poco
{
    public int Total { get; set; }
    public int Min { get; set; }
    public int Max { get; set; }
}

var q = db.From<Track>().Select("COUNT(*) Total, MIN(Year) Min, MAX(Year) Max");

var customPoco = db.Select<Poco>(q).First();
"Poco Aggregates: {0}".Print(customPoco.Dump());

var dynamicResult = db.Select<dynamic>(q).First();
long total = dynamicResult.Total;
long min = dynamicResult.Min;
long max = dynamicResult.Max;
"Dynamic Aggregates: Total: {0}, Min: {1}, Max: {2}".Print(total, min, max);

var artistsWithTracksFrom93 = db.SelectMulti<Track,Artist>(db.From<Track>()
      .Join<Artist>()
      .Where(x => x.Year == 1993));
"Artists with Tracks from 1993:".Print();
foreach (var tuple in artistsWithTracksFrom93)
{
    "Track/Artist: {0}".Print(new {track=tuple.Item1, artist=tuple.Item2}.Dump());
}

packages.config

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="System.Memory" version="4.5.4" targetFramework="net45" />
  <package id="ServiceStack.Text" version="5.10.0" targetFramework="net45" />
  <package id="ServiceStack.Client" version="5.10.0" targetFramework="net45" />
  <package id="ServiceStack.Common" version="5.10.0" targetFramework="net45" />
  <package id="ServiceStack.Interfaces" version="5.10.0" targetFramework="net45" />
  <package id="ServiceStack.OrmLite" version="5.10.0" targetFramework="net45" />
  <package id="ServiceStack.OrmLite.Sqlite.Windows" version="5.10.0" targetFramework="net45" />
</packages>