diff --git a/Infrastructure/AppDbContext.cs b/Infrastructure/AppDbContext.cs
index bd251a6..aa2e6ef 100644
--- a/Infrastructure/AppDbContext.cs
+++ b/Infrastructure/AppDbContext.cs
@@ -1,10 +1,12 @@
 using Domain.AggregateModel.AppAggregate;
 using Domain.AggregateModel.LinkAggregate;
 using Domain.SeedWork;
+using Infrastructure.EntityConfigurations;
 using MediatR;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Design;
 using Microsoft.EntityFrameworkCore.Storage;
+using Pomelo.EntityFrameworkCore.MySql.Infrastructure;
 using System;
 using System.Collections.Generic;
 using System.Data;
@@ -34,13 +36,8 @@ namespace Infrastructure
         }
         protected override void OnModelCreating(ModelBuilder modelBuilder)
         {
-            //modelBuilder.ApplyConfiguration(new ClientRequestEntityTypeConfiguration());
-            //modelBuilder.ApplyConfiguration(new PaymentMethodEntityTypeConfiguration());
-            //modelBuilder.ApplyConfiguration(new OrderEntityTypeConfiguration());
-            //modelBuilder.ApplyConfiguration(new OrderItemEntityTypeConfiguration());
-            //modelBuilder.ApplyConfiguration(new CardTypeEntityTypeConfiguration());
-            //modelBuilder.ApplyConfiguration(new OrderStatusEntityTypeConfiguration());
-            //modelBuilder.ApplyConfiguration(new BuyerEntityTypeConfiguration());
+            modelBuilder.ApplyConfiguration(new AppEntityTypeConfiguration());
+            modelBuilder.ApplyConfiguration(new LinkEntityTypeConfiguration());
         }
 
 
@@ -114,7 +111,16 @@ namespace Infrastructure
         public AppDbContext CreateDbContext(string[] args)
         {
             var optionsBuilder = new DbContextOptionsBuilder<AppDbContext>()
-                .UseMySql("Server=localhost;Database=qrcode;Uid=root;Pwd=root;");
+                    .UseMySql(
+                        "server=localhost;user=root;password=root;database=qrcode",
+                        // For common usages, see pull request #1233.
+                        new MariaDbServerVersion(new Version(10, 5, 9)), // use MariaDbServerVersion for MariaDB
+                        mySqlOptions => mySqlOptions
+                            .CharSetBehavior(CharSetBehavior.NeverAppend)
+                            .MigrationsAssembly("QRCodeService"))
+                    // Everything from this point on is optional but helps with debugging.
+                    .EnableSensitiveDataLogging()
+                    .EnableDetailedErrors();
 
             return new AppDbContext(optionsBuilder.Options, new NoMediator());
         }
diff --git a/Infrastructure/EntityConfigurations/LinkEntityTypeConfiguration.cs b/Infrastructure/EntityConfigurations/LinkEntityTypeConfiguration.cs
index d3caaec..2887e0c 100644
--- a/Infrastructure/EntityConfigurations/LinkEntityTypeConfiguration.cs
+++ b/Infrastructure/EntityConfigurations/LinkEntityTypeConfiguration.cs
@@ -14,9 +14,11 @@ namespace Infrastructure.EntityConfigurations
         public void Configure(EntityTypeBuilder<Link> builder)
         {
             builder.ToTable("Link");
-            builder.HasKey(l => l.ShortCode);
+            builder.HasKey(l => l.Id);
+            builder.HasIndex(l => l.ShortCode).IsUnique();
             builder.Ignore(l => l.DomainEvents);
             builder.Property(l => l.AppId).IsRequired();
+            builder.Property(l => l.ShortCode).HasMaxLength(11);
         }
     }
 }
diff --git a/Infrastructure/Infrastructure.csproj b/Infrastructure/Infrastructure.csproj
index 0196593..cf14200 100644
--- a/Infrastructure/Infrastructure.csproj
+++ b/Infrastructure/Infrastructure.csproj
@@ -11,11 +11,12 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="5.0.3" />
-    <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="3.2.4" />
+	<PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="5.0.0-alpha.2" />
+	  <PackageReference Include="MySqlConnector" Version="1.1.0" />
   </ItemGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\Domain\Domain.csproj" />
   </ItemGroup>
 
-</Project>
+</Project>
\ No newline at end of file
diff --git a/QRCodeService/Controllers/AppController.cs b/QRCodeService/Controllers/AppController.cs
new file mode 100644
index 0000000..c75a6f4
--- /dev/null
+++ b/QRCodeService/Controllers/AppController.cs
@@ -0,0 +1,15 @@
+using Microsoft.AspNetCore.Mvc;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace QRCodeService.Controllers
+{
+    [Route("api/v1/[controller]")]
+    public class AppController:ControllerBase
+    {
+        
+    }
+}
diff --git a/QRCodeService/Migrations/20210224014442_InitialCreate.Designer.cs b/QRCodeService/Migrations/20210224014442_InitialCreate.Designer.cs
new file mode 100644
index 0000000..a28fa63
--- /dev/null
+++ b/QRCodeService/Migrations/20210224014442_InitialCreate.Designer.cs
@@ -0,0 +1,73 @@
+// <auto-generated />
+using System;
+using Infrastructure;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+namespace QRCodeService.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20210224014442_InitialCreate")]
+    partial class InitialCreate
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("Relational:MaxIdentifierLength", 64)
+                .HasAnnotation("ProductVersion", "5.0.3");
+
+            modelBuilder.Entity("Domain.AggregateModel.AppAggregate.App", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    b.Property<string>("AppKey")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("BaseUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("Remarks")
+                        .HasColumnType("longtext");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Apps");
+                });
+
+            modelBuilder.Entity("Domain.AggregateModel.LinkAggregate.Link", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    b.Property<int>("AppId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("BaseUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("FullUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("ShortCode")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("SuffixUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<DateTime>("Time")
+                        .HasColumnType("datetime(6)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Links");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/QRCodeService/Migrations/20210224014442_InitialCreate.cs b/QRCodeService/Migrations/20210224014442_InitialCreate.cs
new file mode 100644
index 0000000..a0ba1ac
--- /dev/null
+++ b/QRCodeService/Migrations/20210224014442_InitialCreate.cs
@@ -0,0 +1,54 @@
+using System;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace QRCodeService.Migrations
+{
+    public partial class InitialCreate : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "Apps",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "int", nullable: false)
+                        .Annotation("MySql:ValueGenerationStrategy", MySqlValueGenerationStrategy.IdentityColumn),
+                    AppKey = table.Column<string>(type: "longtext", nullable: true),
+                    BaseUrl = table.Column<string>(type: "longtext", nullable: true),
+                    Remarks = table.Column<string>(type: "longtext", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Apps", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Links",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "int", nullable: false)
+                        .Annotation("MySql:ValueGenerationStrategy", MySqlValueGenerationStrategy.IdentityColumn),
+                    ShortCode = table.Column<string>(type: "longtext", nullable: true),
+                    BaseUrl = table.Column<string>(type: "longtext", nullable: true),
+                    SuffixUrl = table.Column<string>(type: "longtext", nullable: true),
+                    FullUrl = table.Column<string>(type: "longtext", nullable: true),
+                    AppId = table.Column<int>(type: "int", nullable: false),
+                    Time = table.Column<DateTime>(type: "datetime(6)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Links", x => x.Id);
+                });
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Apps");
+
+            migrationBuilder.DropTable(
+                name: "Links");
+        }
+    }
+}
diff --git a/QRCodeService/Migrations/20210224015439_AddConfiguration.Designer.cs b/QRCodeService/Migrations/20210224015439_AddConfiguration.Designer.cs
new file mode 100644
index 0000000..1643455
--- /dev/null
+++ b/QRCodeService/Migrations/20210224015439_AddConfiguration.Designer.cs
@@ -0,0 +1,72 @@
+// <auto-generated />
+using System;
+using Infrastructure;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+namespace QRCodeService.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20210224015439_AddConfiguration")]
+    partial class AddConfiguration
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("Relational:MaxIdentifierLength", 64)
+                .HasAnnotation("ProductVersion", "5.0.3");
+
+            modelBuilder.Entity("Domain.AggregateModel.AppAggregate.App", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    b.Property<string>("AppKey")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("BaseUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("Remarks")
+                        .HasColumnType("longtext");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("App");
+                });
+
+            modelBuilder.Entity("Domain.AggregateModel.LinkAggregate.Link", b =>
+                {
+                    b.Property<string>("ShortCode")
+                        .HasColumnType("varchar(255)");
+
+                    b.Property<int>("AppId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("BaseUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("FullUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<int>("Id")
+                        .HasColumnType("int");
+
+                    b.Property<string>("SuffixUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<DateTime>("Time")
+                        .HasColumnType("datetime(6)");
+
+                    b.HasKey("ShortCode");
+
+                    b.ToTable("Link");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/QRCodeService/Migrations/20210224015439_AddConfiguration.cs b/QRCodeService/Migrations/20210224015439_AddConfiguration.cs
new file mode 100644
index 0000000..7efc560
--- /dev/null
+++ b/QRCodeService/Migrations/20210224015439_AddConfiguration.cs
@@ -0,0 +1,102 @@
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace QRCodeService.Migrations
+{
+    public partial class AddConfiguration : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_Links",
+                table: "Links");
+
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_Apps",
+                table: "Apps");
+
+            migrationBuilder.RenameTable(
+                name: "Links",
+                newName: "Link");
+
+            migrationBuilder.RenameTable(
+                name: "Apps",
+                newName: "App");
+
+            migrationBuilder.AlterColumn<string>(
+                name: "ShortCode",
+                table: "Link",
+                type: "varchar(255)",
+                nullable: false,
+                defaultValue: "",
+                oldClrType: typeof(string),
+                oldType: "longtext",
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<int>(
+                name: "Id",
+                table: "Link",
+                type: "int",
+                nullable: false,
+                oldClrType: typeof(int),
+                oldType: "int")
+                .OldAnnotation("MySql:ValueGenerationStrategy", MySqlValueGenerationStrategy.IdentityColumn);
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_Link",
+                table: "Link",
+                column: "ShortCode");
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_App",
+                table: "App",
+                column: "Id");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_Link",
+                table: "Link");
+
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_App",
+                table: "App");
+
+            migrationBuilder.RenameTable(
+                name: "Link",
+                newName: "Links");
+
+            migrationBuilder.RenameTable(
+                name: "App",
+                newName: "Apps");
+
+            migrationBuilder.AlterColumn<int>(
+                name: "Id",
+                table: "Links",
+                type: "int",
+                nullable: false,
+                oldClrType: typeof(int),
+                oldType: "int")
+                .Annotation("MySql:ValueGenerationStrategy", MySqlValueGenerationStrategy.IdentityColumn);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "ShortCode",
+                table: "Links",
+                type: "longtext",
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "varchar(255)");
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_Links",
+                table: "Links",
+                column: "Id");
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_Apps",
+                table: "Apps",
+                column: "Id");
+        }
+    }
+}
diff --git a/QRCodeService/Migrations/20210224015858_SetProperty.Designer.cs b/QRCodeService/Migrations/20210224015858_SetProperty.Designer.cs
new file mode 100644
index 0000000..8010dfd
--- /dev/null
+++ b/QRCodeService/Migrations/20210224015858_SetProperty.Designer.cs
@@ -0,0 +1,77 @@
+// <auto-generated />
+using System;
+using Infrastructure;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+namespace QRCodeService.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20210224015858_SetProperty")]
+    partial class SetProperty
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("Relational:MaxIdentifierLength", 64)
+                .HasAnnotation("ProductVersion", "5.0.3");
+
+            modelBuilder.Entity("Domain.AggregateModel.AppAggregate.App", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    b.Property<string>("AppKey")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("BaseUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("Remarks")
+                        .HasColumnType("longtext");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("App");
+                });
+
+            modelBuilder.Entity("Domain.AggregateModel.LinkAggregate.Link", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    b.Property<int>("AppId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("BaseUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("FullUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("ShortCode")
+                        .HasMaxLength(11)
+                        .HasColumnType("varchar(11)");
+
+                    b.Property<string>("SuffixUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<DateTime>("Time")
+                        .HasColumnType("datetime(6)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ShortCode")
+                        .IsUnique();
+
+                    b.ToTable("Link");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/QRCodeService/Migrations/20210224015858_SetProperty.cs b/QRCodeService/Migrations/20210224015858_SetProperty.cs
new file mode 100644
index 0000000..8895332
--- /dev/null
+++ b/QRCodeService/Migrations/20210224015858_SetProperty.cs
@@ -0,0 +1,80 @@
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace QRCodeService.Migrations
+{
+    public partial class SetProperty : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_Link",
+                table: "Link");
+
+            migrationBuilder.AlterColumn<int>(
+                name: "Id",
+                table: "Link",
+                type: "int",
+                nullable: false,
+                oldClrType: typeof(int),
+                oldType: "int")
+                .Annotation("MySql:ValueGenerationStrategy", MySqlValueGenerationStrategy.IdentityColumn);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "ShortCode",
+                table: "Link",
+                type: "varchar(11)",
+                maxLength: 11,
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "varchar(255)");
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_Link",
+                table: "Link",
+                column: "Id");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Link_ShortCode",
+                table: "Link",
+                column: "ShortCode",
+                unique: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_Link",
+                table: "Link");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Link_ShortCode",
+                table: "Link");
+
+            migrationBuilder.AlterColumn<string>(
+                name: "ShortCode",
+                table: "Link",
+                type: "varchar(255)",
+                nullable: false,
+                defaultValue: "",
+                oldClrType: typeof(string),
+                oldType: "varchar(11)",
+                oldMaxLength: 11,
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<int>(
+                name: "Id",
+                table: "Link",
+                type: "int",
+                nullable: false,
+                oldClrType: typeof(int),
+                oldType: "int")
+                .OldAnnotation("MySql:ValueGenerationStrategy", MySqlValueGenerationStrategy.IdentityColumn);
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_Link",
+                table: "Link",
+                column: "ShortCode");
+        }
+    }
+}
diff --git a/QRCodeService/Migrations/AppDbContextModelSnapshot.cs b/QRCodeService/Migrations/AppDbContextModelSnapshot.cs
new file mode 100644
index 0000000..6213d5e
--- /dev/null
+++ b/QRCodeService/Migrations/AppDbContextModelSnapshot.cs
@@ -0,0 +1,75 @@
+// <auto-generated />
+using System;
+using Infrastructure;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+namespace QRCodeService.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    partial class AppDbContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("Relational:MaxIdentifierLength", 64)
+                .HasAnnotation("ProductVersion", "5.0.3");
+
+            modelBuilder.Entity("Domain.AggregateModel.AppAggregate.App", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    b.Property<string>("AppKey")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("BaseUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("Remarks")
+                        .HasColumnType("longtext");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("App");
+                });
+
+            modelBuilder.Entity("Domain.AggregateModel.LinkAggregate.Link", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    b.Property<int>("AppId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("BaseUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("FullUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<string>("ShortCode")
+                        .HasMaxLength(11)
+                        .HasColumnType("varchar(11)");
+
+                    b.Property<string>("SuffixUrl")
+                        .HasColumnType("longtext");
+
+                    b.Property<DateTime>("Time")
+                        .HasColumnType("datetime(6)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ShortCode")
+                        .IsUnique();
+
+                    b.ToTable("Link");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/QRCodeService/QRCodeService.csproj b/QRCodeService/QRCodeService.csproj
index fe86347..3ef2f5f 100644
--- a/QRCodeService/QRCodeService.csproj
+++ b/QRCodeService/QRCodeService.csproj
@@ -21,8 +21,16 @@
     <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="5.0.1" NoWarn="NU1605" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="5.0.1" NoWarn="NU1605" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="5.0.3" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="5.0.3">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="5.0.3">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
     <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.10.9" />
-    <PackageReference Include="MySqlConnector" Version="1.2.1" />
+    <PackageReference Include="MySqlConnector" Version="1.1.0" />
     <PackageReference Include="QRCoder" Version="1.4.1" />
     <PackageReference Include="Serilog.AspNetCore" Version="3.4.0" />
     <PackageReference Include="Serilog.Settings.Configuration" Version="3.1.0" />
diff --git a/QRCodeService/Startup.cs b/QRCodeService/Startup.cs
index 734409d..9b46b95 100644
--- a/QRCodeService/Startup.cs
+++ b/QRCodeService/Startup.cs
@@ -45,7 +45,7 @@ namespace QRCodeService
             services.AddTransient(typeof(IPipelineBehavior<,>), typeof(TransactionBehaviour<,>));
 
             //EFCore
-            services.AddDbContextPool<AppDbContext>(
+            services.AddDbContext<AppDbContext>(
                 dbContextOptions => dbContextOptions
                     .UseMySql(
                         "server=localhost;user=root;password=root;database=qrcode",