Migrate to EF.Core

.gitignore

@@ -187,3 +187,5 @@ Temporary Items
 .vscode/*
 
 database.db
+database.db-shm
+database.db-wal

AfRApay.Web/AfRApay.Web.csproj

@@ -9,12 +9,15 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="linq2db" Version="4.4.1" />
+      <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="7.0.2" />
       <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="7.0.2" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="7.0.2">
+        <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        <PrivateAssets>all</PrivateAssets>
+      </PackageReference>
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.2" />
       <PackageReference Include="Swashbuckle.AspNetCore" Version="6.5.0" />
       <PackageReference Include="Swashbuckle.AspNetCore.Filters" Version="7.0.6" />
-      <PackageReference Include="System.Data.SQLite" Version="1.0.115" />
-      <PackageReference Include="System.Data.SQLite.Core.osx.arm64" Version="1.0.117" />
     </ItemGroup>
 
     <Target Name="SetSourceRevisionId" BeforeTargets="InitializeSourceControlInformation">

AfRApay.Web/Backend/Database.cs

@@ -1,34 +0,0 @@
-using AfRApay.Web.Backend.Tables;
-using LinqToDB;
-using LinqToDB.Configuration;
-using LinqToDB.Data;
-
-namespace AfRApay.Web.Backend;
-
-public class Database {
-	private class ConnectionStringSettings : IConnectionStringSettings {
-		public string ConnectionString { get; set; } = null!;
-		public string Name             { get; set; } = null!;
-		public string ProviderName     { get; set; } = null!;
-		public bool   IsGlobal         => false;
-	}
-
-	public class Settings : ILinqToDBSettings {
-		public IEnumerable<IDataProviderSettings> DataProviders => Enumerable.Empty<IDataProviderSettings>();
-
-		public string DefaultConfiguration => "SQLite";
-		public string DefaultDataProvider  => "SQLite";
-
-		public IEnumerable<IConnectionStringSettings> ConnectionStrings {
-			get { yield return new ConnectionStringSettings { Name = "db", ProviderName = "SQLite", ConnectionString = @"Data Source=database.db;" }; }
-		}
-	}
-
-	public class DbConn : DataConnection {
-		public DbConn() : base("db") { }
-		public ITable<DbInfo>      DbInfo => this.GetTable<DbInfo>();
-		public ITable<User>        Users  => this.GetTable<User>();
-		public ITable<Card>        Cards  => this.GetTable<Card>();
-		public ITable<Config> Config => this.GetTable<Config>();
-	}
-}

AfRApay.Web/Backend/Database/DatabaseContext.cs

@@ -0,0 +1,21 @@
+using AfRApay.Web.Backend.Database.Tables;
+using Microsoft.EntityFrameworkCore;
+
+namespace AfRApay.Web.Backend.Database;
+
+public partial class DatabaseContext : DbContext {
+	public DatabaseContext() { }
+	public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options) { }
+
+	public virtual DbSet<Card>   Cards  { get; set; } = null!;
+	public virtual DbSet<User>   Users  { get; set; } = null!;
+	public virtual DbSet<Config> Config { get; set; } = null!;
+
+	protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) => optionsBuilder.UseSqlite("Data Source=database.db");
+
+	protected override void OnModelCreating(ModelBuilder modelBuilder) {
+		OnModelCreatingPartial(modelBuilder);
+	}
+
+	partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
+}

AfRApay.Web/Backend/Database/Migrations/20230213181437_InitialCreate.Designer.cs

@@ -0,0 +1,95 @@
+// <auto-generated />
+using AfRApay.Web.Backend.Database;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace AfRApay.Web.Backend.Database.Migrations
+{
+    [DbContext(typeof(DatabaseContext))]
+    [Migration("20230213181437_InitialCreate")]
+    partial class InitialCreate
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "7.0.2");
+
+            modelBuilder.Entity("AfRApay.Web.Backend.Database.Tables.Card", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("CardId");
+
+                    b.Property<long>("UserId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("Cards");
+                });
+
+            modelBuilder.Entity("AfRApay.Web.Backend.Database.Tables.Config", b =>
+                {
+                    b.Property<string>("Name")
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("Name");
+
+                    b.Property<string>("Value")
+                        .IsRequired()
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("Value");
+
+                    b.HasKey("Name");
+
+                    b.ToTable("Config");
+                });
+
+            modelBuilder.Entity("AfRApay.Web.Backend.Database.Tables.User", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("ID");
+
+                    b.Property<long>("Balance")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("Balance");
+
+                    b.Property<string>("LastIdempotencyKey")
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("LastIdempotencyKey");
+
+                    b.Property<string>("Nickname")
+                        .IsRequired()
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("Nickname");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Nickname")
+                        .IsUnique();
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("AfRApay.Web.Backend.Database.Tables.Card", b =>
+                {
+                    b.HasOne("AfRApay.Web.Backend.Database.Tables.User", "User")
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("User");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

AfRApay.Web/Backend/Database/Migrations/20230213181437_InitialCreate.cs

@@ -0,0 +1,83 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace AfRApay.Web.Backend.Database.Migrations
+{
+    /// <inheritdoc />
+    public partial class InitialCreate : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "Config",
+                columns: table => new
+                {
+                    Name = table.Column<string>(type: "NVarChar(255)", nullable: false),
+                    Value = table.Column<string>(type: "NVarChar(255)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Config", x => x.Name);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Users",
+                columns: table => new
+                {
+                    ID = table.Column<long>(type: "INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    Balance = table.Column<long>(type: "INTEGER", nullable: false),
+                    Nickname = table.Column<string>(type: "NVarChar(255)", nullable: false),
+                    LastIdempotencyKey = table.Column<string>(type: "NVarChar(255)", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Users", x => x.ID);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Cards",
+                columns: table => new
+                {
+                    CardId = table.Column<string>(type: "NVarChar(255)", nullable: false),
+                    UserId = table.Column<long>(type: "INTEGER", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Cards", x => x.CardId);
+                    table.ForeignKey(
+                        name: "FK_Cards_Users_UserId",
+                        column: x => x.UserId,
+                        principalTable: "Users",
+                        principalColumn: "ID",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Cards_UserId",
+                table: "Cards",
+                column: "UserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Users_Nickname",
+                table: "Users",
+                column: "Nickname",
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Cards");
+
+            migrationBuilder.DropTable(
+                name: "Config");
+
+            migrationBuilder.DropTable(
+                name: "Users");
+        }
+    }
+}

AfRApay.Web/Backend/Database/Migrations/DatabaseContextModelSnapshot.cs

@@ -0,0 +1,92 @@
+// <auto-generated />
+using AfRApay.Web.Backend.Database;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace AfRApay.Web.Backend.Database.Migrations
+{
+    [DbContext(typeof(DatabaseContext))]
+    partial class DatabaseContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder.HasAnnotation("ProductVersion", "7.0.2");
+
+            modelBuilder.Entity("AfRApay.Web.Backend.Database.Tables.Card", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("CardId");
+
+                    b.Property<long>("UserId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("Cards");
+                });
+
+            modelBuilder.Entity("AfRApay.Web.Backend.Database.Tables.Config", b =>
+                {
+                    b.Property<string>("Name")
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("Name");
+
+                    b.Property<string>("Value")
+                        .IsRequired()
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("Value");
+
+                    b.HasKey("Name");
+
+                    b.ToTable("Config");
+                });
+
+            modelBuilder.Entity("AfRApay.Web.Backend.Database.Tables.User", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("ID");
+
+                    b.Property<long>("Balance")
+                        .HasColumnType("INTEGER")
+                        .HasColumnName("Balance");
+
+                    b.Property<string>("LastIdempotencyKey")
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("LastIdempotencyKey");
+
+                    b.Property<string>("Nickname")
+                        .IsRequired()
+                        .HasColumnType("NVarChar(255)")
+                        .HasColumnName("Nickname");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Nickname")
+                        .IsUnique();
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("AfRApay.Web.Backend.Database.Tables.Card", b =>
+                {
+                    b.HasOne("AfRApay.Web.Backend.Database.Tables.User", "User")
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("User");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

AfRApay.Web/Backend/Database/Tables/Card.cs

@@ -0,0 +1,10 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace AfRApay.Web.Backend.Database.Tables;
+
+[Table("Cards")]
+public class Card {
+	[Column("CardId", TypeName = "NVarChar(255)")] [Key] public string Id   { get; set; } = null!;
+	[Column("UserId")] [Required]                        public User   User { get; set; } = null!;
+}

AfRApay.Web/Backend/Database/Tables/Config.cs

@@ -0,0 +1,10 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace AfRApay.Web.Backend.Database.Tables;
+
+[Table("Config")]
+public class Config {
+	[Column("Name", TypeName = "NVarChar(255)")] [Key]       public string Name  { get; set; } = null!;
+	[Column("Value", TypeName = "NVarChar(255)")] [Required] public string Value { get; set; } = null!;
+}

AfRApay.Web/Backend/Database/Tables/User.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using Microsoft.EntityFrameworkCore;
+
+namespace AfRApay.Web.Backend.Database.Tables;
+
+[Table("Users")]
+[Index(nameof(Nickname), IsUnique = true)]
+public class User {
+	[Column("ID")] [Key]                                        public long    Id                 { get; set; }
+	[Column("Balance")] [Required]                              public long    Balance            { get; set; }
+	[Column("Nickname", TypeName = "NVarChar(255)")] [Required] public string  Nickname           { get; set; } = null!;
+	[Column("LastIdempotencyKey", TypeName = "NVarChar(255)")]  public string? LastIdempotencyKey { get; set; }
+}

AfRApay.Web/Backend/Migrations.cs

@@ -1,91 +0,0 @@
-using AfRApay.Web.Backend.Tables;
-using LinqToDB;
-using LinqToDB.Data;
-
-namespace AfRApay.Web.Backend;
-
-public static class Migrations {
-	private const int DbVer = 1;
-
-	// ReSharper disable once CollectionNeverUpdated.Local
-	// ReSharper disable once InconsistentNaming
-	private static readonly List<Migration> _migrations = new();
-
-	public static void RunMigrations() {
-		using var db     = new Database.DbConn();
-		var       ccolor = Console.ForegroundColor;
-
-		if (!db.DataProvider.GetSchemaProvider().GetSchema(db).Tables.Any()) {
-			Console.ForegroundColor = ConsoleColor.DarkCyan;
-			Console.Write("Running migration: ");
-			Console.ForegroundColor = ConsoleColor.Yellow;
-			Console.WriteLine("Initialize Database");
-
-			db.CreateTable<DbInfo>();
-			db.CreateTable<User>();
-			db.CreateTable<Card>();
-			db.CreateTable<Config>();
-
-			db.InsertWithIdentity(new DbInfo { DbVer = DbVer });
-		}
-		else if (db.DataProvider.GetSchemaProvider().GetSchema(db).Tables.All(t => t.TableName != "DbInfo")) {
-			db.CreateTable<DbInfo>();
-			db.InsertWithIdentity(new DbInfo { DbVer = 0 });
-		}
-
-		Console.ForegroundColor = ConsoleColor.Yellow;
-		Console.WriteLine($"Database version: {db.DbInfo.ToList().First().DbVer}");
-
-		var migrationsToRun = _migrations.FindAll(p => p.IntroducedWithDbVer > db.DbInfo.First().DbVer);
-		if (migrationsToRun.Count == 0) {
-			Console.ForegroundColor = ConsoleColor.Green;
-			Console.WriteLine("No migrations to run.");
-		}
-		else {
-			new Migration(0, "BEGIN TRANSACTION").Run(db);
-			try {
-				migrationsToRun.ForEach(p => p.Run(db));
-			}
-			catch {
-				Console.ForegroundColor = ConsoleColor.DarkRed;
-				Console.WriteLine($"Migrating to database version {DbVer} failed.");
-				new Migration(0, "ROLLBACK TRANSACTION").Run(db);
-				Console.ForegroundColor = ConsoleColor.DarkYellow;
-				Console.WriteLine("Rolled back migrations.");
-				Environment.Exit(1);
-			}
-
-			new Migration(0, "COMMIT TRANSACTION").Run(db);
-
-			var newdb  = new Database.DbConn();
-			var dbinfo = newdb.DbInfo.First();
-			dbinfo.DbVer = DbVer;
-			newdb.Update(dbinfo);
-
-			Console.ForegroundColor = ConsoleColor.DarkGreen;
-			Console.WriteLine($"Database version is now: {DbVer}");
-			Console.ForegroundColor = ConsoleColor.Green;
-			Console.WriteLine("Finished running migrations.");
-		}
-
-		Console.ForegroundColor = ccolor;
-	}
-
-	private class Migration {
-		private readonly string _sql;
-		public readonly  int    IntroducedWithDbVer;
-
-		public Migration(int introducedWithDbVer, string sql) {
-			IntroducedWithDbVer = introducedWithDbVer;
-			_sql                = sql;
-		}
-
-		public void Run(DataConnection db) {
-			Console.ForegroundColor = ConsoleColor.DarkCyan;
-			Console.Write("Running migration: ");
-			Console.ForegroundColor = ConsoleColor.Yellow;
-			Console.WriteLine(_sql);
-			db.Execute(_sql);
-		}
-	}
-}

AfRApay.Web/Backend/Startup.cs

@@ -1,11 +1,8 @@
 using System.Reflection;
-using AfRApay.Web.Backend;
+using AfRApay.Web.Backend.Database;
-using LinqToDB.Data;
+using Microsoft.EntityFrameworkCore;
 using Swashbuckle.AspNetCore.Filters;
 
-DataConnection.DefaultSettings = new Database.Settings();
-Migrations.RunMigrations();
-
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddRazorPages();
@@ -17,6 +14,7 @@ builder.Services.AddSwaggerGen(options => {
 builder.Services.AddSwaggerExamplesFromAssemblies(Assembly.GetEntryAssembly());
 
 #if (DEBUG)
+builder.Services.AddDatabaseDeveloperPageExceptionFilter();
 builder.Services.AddControllers().AddRazorRuntimeCompilation();
 builder.Services.AddControllers();
 #else
@@ -40,4 +38,6 @@ app.UseAuthorization();
 app.MapRazorPages();
 app.MapControllers();
 
+new DatabaseContext().Database.Migrate();
+
 app.Run();

AfRApay.Web/Backend/Tables/Card.cs

@@ -1,11 +0,0 @@
-using LinqToDB.Mapping;
-
-#pragma warning disable CS8618
-
-namespace AfRApay.Web.Backend.Tables;
-
-[Table(Name = "Cards")]
-public class Card {
-	[Column(Name = "CardId"), PrimaryKey, NotNull] public string CardId { get; set; }
-	[Column(Name = "UserId"), NotNull]             public int    UserId { get; set; }
-}

AfRApay.Web/Backend/Tables/Config.cs

@@ -1,10 +0,0 @@
-using LinqToDB.Mapping;
-#pragma warning disable CS8618
-
-namespace AfRApay.Web.Backend.Tables;
-
-[Table(Name = "Config")]
-public class Config {
-	[Column(Name = "Name"), PrimaryKey, NotNull] public string Name  { get; set; }
-	[Column(Name = "Value"), NotNull]            public string Value { get; set; }
-}

AfRApay.Web/Backend/Tables/DbInfo.cs

@@ -1,9 +0,0 @@
-using LinqToDB.Mapping;
-
-namespace AfRApay.Web.Backend.Tables;
-
-[Table(Name = "DbInfo")]
-public class DbInfo {
-	[Column(Name = "ID"), PrimaryKey, Identity, NotNull] public int Id    { get; set; }
-	[Column(Name = "DbVer"), NotNull]                    public int DbVer { get; set; }
-}

AfRApay.Web/Backend/Tables/User.cs

@@ -1,13 +0,0 @@
-using LinqToDB.Mapping;
-
-#pragma warning disable CS8618
-
-namespace AfRApay.Web.Backend.Tables;
-
-[Table(Name = "Users")]
-public class User {
-	[Column(Name = "ID"), PrimaryKey, Identity, NotNull] public int     Id                 { get; set; }
-	[Column(Name = "Nickname"), NotNull]                 public string  Nickname           { get; set; }
-	[Column(Name = "Balance")]                           public int     Balance            { get; set; }
-	[Column(Name = "LastIdempotencyKey")]                public string? LastIdempotencyKey { get; set; }
-}

AfRApay.Web/Controllers/CardController.cs

@@ -1,8 +1,8 @@
-using AfRApay.Web.Backend;
+using AfRApay.Web.Backend.Database;
-using AfRApay.Web.Backend.Tables;
+using AfRApay.Web.Backend.Database.Tables;
 using AfRApay.Web.Controllers.Schema;
-using LinqToDB;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
 using Swashbuckle.AspNetCore.Filters;
 
 namespace AfRApay.Web.Controllers;
@@ -25,8 +25,8 @@ public class CardController : Controller {
 	[SwaggerResponseExample(StatusCodes.Status404NotFound, typeof(ErrorNoActiveLinkProcessExample))]
 	[Route("/api/card/{card}/link")]
 	public async Task<IActionResult> Link(string card) {
-		var db = new Database.DbConn();
+		var db = new DatabaseContext();
-		if (db.Cards.Any(p => p.CardId == card)) {
+		if (db.Cards.Any(p => p.Id == card)) {
 			return StatusCode(StatusCodes.Status304NotModified);
 		}
 
@@ -48,8 +48,8 @@ public class CardController : Controller {
 		var user = db.Users.First(p => p.Id == int.Parse(linkFlag.Value));
 		linkFlag.Value = "";
 
-		await db.InsertAsync(new Card { CardId = card, UserId = user.Id });
+		db.Add(new Card { Id = card, User = user });
-		await db.UpdateAsync(linkFlag);
+		await db.SaveChangesAsync();
 		return Ok(new UserResponse(user));
 	}
 
@@ -72,10 +72,9 @@ public class CardController : Controller {
 	[SwaggerResponseExample(412, typeof(ErrorBalanceOutOfRangeExample))]
 	[Route("/api/card/{card}/transaction/{ik}")]
 	public async Task<IActionResult> Transaction(string card, string ik, [FromQuery] int amount) {
-		var db = new Database.DbConn();
+		var db = new DatabaseContext();
-		if (db.Cards.Any(p => p.CardId == card)) {
+		if (db.Cards.Any(p => p.Id == card)) {
-			var userId = db.Cards.First(p => p.CardId == card).UserId;
+			var user = db.Cards.Include(p => p.User).First(p => p.Id == card).User;
-			var user   = db.Users.First(p => p.Id == userId);
 
 			if (ik == "" || ik != user.LastIdempotencyKey) {
 				user.LastIdempotencyKey = ik;
@@ -87,7 +86,7 @@ public class CardController : Controller {
 				user.Balance += amount;
 			}
 
-			await db.UpdateAsync(user);
+			await db.SaveChangesAsync();
 			return Ok(new UserResponse(user));
 		}
 
@@ -108,10 +107,9 @@ public class CardController : Controller {
 	[SwaggerResponseExample(404, typeof(ErrorUnknownCardExample))]
 	[Route("/api/card/{card}/balance")]
 	public IActionResult Balance(string card) {
-		var db = new Database.DbConn();
+		var db = new DatabaseContext();
-		if (db.Cards.Any(p => p.CardId == card)) {
+		if (db.Cards.Any(p => p.Id == card)) {
-			var userId = db.Cards.First(p => p.CardId == card).UserId;
+			var user = db.Cards.Include(p => p.User).First(p => p.Id == card).User;
-			var user   = db.Users.First(p => p.Id == userId);
 
 			return Ok(new UserResponse(user));
 		}
@@ -120,7 +118,7 @@ public class CardController : Controller {
 	}
 
 	private class UserUpdatedExample : IExamplesProvider<UserResponse> {
-		public UserResponse GetExamples() => new(new User { Id = 123, Nickname = "testman", Balance = 2550, LastIdempotencyKey = "5a6c94aa"});
+		public UserResponse GetExamples() => new(new User { Id = 123, Nickname = "testman", Balance = 2550, LastIdempotencyKey = "5a6c94aa" });
 	}
 
 	private class ErrorUnknownCardExample : IExamplesProvider<ErrorResponse> {

AfRApay.Web/Controllers/Schema/ErrorResponse.cs

@@ -1,5 +1,4 @@
 using System.ComponentModel;
-using AfRApay.Web.Backend.Tables;
 using J = System.Text.Json.Serialization.JsonPropertyNameAttribute;
 
 namespace AfRApay.Web.Controllers.Schema;

AfRApay.Web/Controllers/Schema/UserResponse.cs

@@ -1,5 +1,5 @@
 using System.ComponentModel;
-using AfRApay.Web.Backend.Tables;
+using AfRApay.Web.Backend.Database.Tables;
 using J = System.Text.Json.Serialization.JsonPropertyNameAttribute;
 
 namespace AfRApay.Web.Controllers.Schema;

AfRApay.Web/Pages/AddUser.cshtml.cs

@@ -1,8 +1,6 @@
-using System.Data;
+using System.Net;
-using System.Net;
+using AfRApay.Web.Backend.Database;
-using AfRApay.Web.Backend;
+using AfRApay.Web.Backend.Database.Tables;
-using AfRApay.Web.Backend.Tables;
-using LinqToDB;
 using Microsoft.AspNetCore.Mvc.RazorPages;
 
 namespace AfRApay.Web.Pages;
@@ -10,17 +8,18 @@ namespace AfRApay.Web.Pages;
 public class AddUserModel : PageModel {
 	public void OnGet() { }
 
-	public void OnPost() {
+	public async void OnPost() {
-		using var db = new Database.DbConn();
+		await using var db = new DatabaseContext();
 		if (Request.Form.ContainsKey("nickname") && !string.IsNullOrWhiteSpace(Request.Form["nickname"])) {
 			var nick = Request.Form["nickname"];
-			if (db.Users.Any(p => p.Nickname == nick)) {
+			if (db.Users.Any(p => p.Nickname == nick.ToString())) {
 				Response.Redirect("/ErrorRedirect?redir=/AddUser&message=" + WebUtility.UrlEncode("User with nick already exists."));
 				return;
 			}
 
-			var user = new User { Nickname = nick!, Balance = 0 };
+			var user = new User { Nickname = nick.ToString(), Balance = 0 };
-			db.InsertWithIdentity(user);
+			db.Add(user);
+			await db.SaveChangesAsync();
 			Response.Redirect($"/#{user.Nickname}");
 			return;
 		}

AfRApay.Web/Pages/EditUser.cshtml

@@ -1,15 +1,16 @@
 @page "{id:int}"
-@using AfRApay.Web.Backend
+@using AfRApay.Web.Backend.Database
 @using Microsoft.AspNetCore.Mvc.TagHelpers
+@using Microsoft.EntityFrameworkCore
 @model EditUserModel
 @{
 	ViewData["Title"] = "Edit User";
 	if (Request.Method == "POST" && Request.Form["action"] == "delete") {
 		return;
 	}
-	var db = new Database.DbConn();
+	var db = new DatabaseContext();
 	var user = db.Users.First(p => p.Id == int.Parse(RouteData.Values["id"]!.ToString()!));
-	var cards = db.Cards.Where(p => p.UserId == user.Id);
+	var cards = db.Cards.Include(p => p.User).Where(p => p.User == user);
 
 	var linkFlag = db.Config.FirstOrDefault(p => p.Name == "link");
 	var lTimeFlag = db.Config.FirstOrDefault(p => p.Name == "lTime");
@@ -142,8 +143,8 @@
 <div class="row justify-content-center">
 	@{
 		foreach (var card in cards) {
-			await RenderCard(user.Nickname, card.CardId);
+			await RenderCard(user.Nickname, card.Id);
-			await RenderCardModal(user.Nickname, card.CardId);
+			await RenderCardModal(user.Nickname, card.Id);
 		}
 		await RenderCard(user.Nickname, type: EditUserModel.CardType.LinkPlaceholder);
 	}

AfRApay.Web/Pages/EditUser.cshtml.cs

@@ -1,8 +1,6 @@
-using System.Data;
+using System.Net;
-using System.Net;
+using AfRApay.Web.Backend.Database;
-using AfRApay.Web.Backend;
+using AfRApay.Web.Backend.Database.Tables;
-using AfRApay.Web.Backend.Tables;
-using LinqToDB;
 using Microsoft.AspNetCore.Mvc.RazorPages;
 
 namespace AfRApay.Web.Pages;
@@ -10,21 +8,22 @@ namespace AfRApay.Web.Pages;
 public class EditUserModel : PageModel {
 	public void OnGet() { }
 
-	public void OnPost() {
+	public async void OnPost() {
-		using var db     = new Database.DbConn();
+		await using var db     = new DatabaseContext();
-		var       userId = int.Parse(RouteData.Values["id"]!.ToString()!);
+		var             userId = long.Parse(RouteData.Values["id"]!.ToString()!);
-		var       user   = db.Users.First(p => p.Id == userId);
+		var             user   = db.Users.First(p => p.Id == userId);
 
 		if (Request.Form["action"] == "delete") {
-			db.Cards.Delete(p => p.UserId == userId);
+			db.Remove(user);
-			db.Delete(user);
+			await db.SaveChangesAsync();
 			Response.Redirect("/");
 			return;
 		}
 
 		if (Request.Form["action"] == "deleteCard" && Request.Form.ContainsKey("cardId")) {
-			var card = db.Cards.First(p => p.CardId == Request.Form["cardId"]);
+			var card = db.Cards.First(p => p.Id == Request.Form["cardId"].ToString());
-			db.Delete(card);
+			db.Remove(card);
+			await db.SaveChangesAsync();
 			Response.Redirect($"/EditUser/{userId}");
 			return;
 		}
@@ -37,16 +36,18 @@ public class EditUserModel : PageModel {
 
 			if (lTimeFlag == null) {
 				lTimeFlag = new Config { Name = "lTime", Value = DateTime.UtcNow.ToString("s") };
-				db.Insert(lTimeFlag);
+				db.Add(lTimeFlag);
+				await db.SaveChangesAsync();
 			}
 			else {
 				lTimeFlag.Value = DateTime.UtcNow.ToString("s");
-				db.Update(lTimeFlag);
+				await db.SaveChangesAsync();
 			}
 
 			if (linkFlag == null) {
 				linkFlag = new Config { Name = "link", Value = user.Id.ToString() };
-				db.Insert(linkFlag);
+				db.Add(linkFlag);
+				await db.SaveChangesAsync();
 				return;
 			}
 
@@ -55,27 +56,27 @@ public class EditUserModel : PageModel {
 			}
 
 			linkFlag.Value = user.Id.ToString();
-			db.Update(linkFlag);
+			await db.SaveChangesAsync();
 			return;
 		}
 
 		if (Request.Form["action"] == "save" && Request.Form.ContainsKey("nickname") && !string.IsNullOrWhiteSpace(Request.Form["nickname"])) {
-			var nick = Request.Form["nickname"];
+			var nick = Request.Form["nickname"].ToString();
 			if (db.Users.Any(p => p.Nickname == nick && p.Id != userId)) {
 				Response.Redirect($"/ErrorRedirect?redir=/EditUser/{userId}&message=" + WebUtility.UrlEncode("User with nick already exists."));
 				return;
 			}
 
-			user.Nickname = nick!;
+			user.Nickname = nick;
-			db.Update(user);
+			await db.SaveChangesAsync();
 		}
 
 		Response.Redirect($"/#{user.Nickname}");
 	}
 
 	public enum CardType {
-		Normal = 1,
+		Normal               = 1,
-		LinkPlaceholder = 2,
+		LinkPlaceholder      = 2,
 		DeletionConfirmation = 3
 	}
 }

AfRApay.Web/Pages/Index.cshtml

@@ -1,9 +1,9 @@
 @page
-@using AfRApay.Web.Backend
+@using AfRApay.Web.Backend.Database
 @model IndexModel
 @{
 	ViewData["Title"] = "Index";
-	var db = new Database.DbConn();
+	var db = new DatabaseContext();
 }
 
 @section Header {
@@ -62,7 +62,7 @@
 					@($"{user.Balance / 100M:C}")
 				</td>
 				<td>
-					<b>@db.Cards.Count(p => p.UserId == user.Id)</b> cards linked.
+					<b>@db.Cards.Count(p => p.User.Id == user.Id)</b> cards linked.
 				</td>
 				<td>
 					<!-- Displayed when in big layout -->

AfRApay.Web/Pages/Index.cshtml.cs

@@ -1,7 +1,5 @@
-using System.Data;
+using System.Net;
-using System.Net;
+using AfRApay.Web.Backend.Database;
-using AfRApay.Web.Backend;
-using LinqToDB;
 using Microsoft.AspNetCore.Mvc.RazorPages;
 
 namespace AfRApay.Web.Pages;
@@ -9,8 +7,8 @@ namespace AfRApay.Web.Pages;
 public class IndexModel : PageModel {
 	public void OnGet() { }
 
-	public void OnPost() {
+	public async void OnPost() {
-		using var db = new Database.DbConn();
+		await using var db = new DatabaseContext();
 		if (Request.Form["action"] == "transaction" && Request.Form.ContainsKey("userId") && Request.Form.ContainsKey("amount")) {
 			var userId = int.Parse(Request.Form["userId"].ToString());
 			var amount = int.Parse(Request.Form["amount"].ToString());
@@ -25,7 +23,7 @@ public class IndexModel : PageModel {
 			}
 
 			user.Balance += amount;
-			db.Update(user);
+			await db.SaveChangesAsync();
 
 			Response.Redirect($"/#{user.Nickname}");
 		}

AfRApay.Web/README.md

@@ -4,6 +4,10 @@ This is the software that runs on the MateCard terminal, powered by an ESP32.
 ## Setting up dev environment
 This project uses PlatformIO. Quick setup guide:
 - Install dotnet-sdk (macOS: `brew install dotnet-sdk` / Arch Linux: `pacman -S dotnet-host dotnet-runtime dotnet-sdk dotnet-targeting-pack aspnet-runtime aspnet-targeting-pack`)
-- To start the webserver, execute `dotnet run` in this directory.
+- Install the EF.Core tool for database management: `dotnet tool install --global dotnet-ef`
+- To start the webserver, execute `dotnet run` in this directory. If the database does not exist, it will be created. Migrations are applied automatically.
 - Swagger / OpenAPI docs will automatically generate at `/swagger`.
 - To test with the MateCard ESP32 code, get your computer's IP and configure the ESP to use `http://<yourip>:5296` as the API base url.
+
+## Creating migrations
+- To create a migration, change the respective code in `Backend/Database/Tables/TableName.cs` and then run `dotnet ef migrations add DescriptiveNameOfChanges`. The migration will be generated automatically.