Pomelo.EntityFrameworkCore.MySql

Pomelo.EntityFrameworkCore.MySql is an Entity Framework Core provider built on top of MySqlConnector. It makes you are able to use the Entity Framework Core ORM with MySQL. Besides, async operations were supported well in this library.

Nightly Builds

To add a NuGet.config file in your solution root, then you can use the unstable packages:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <add key="Pomelo" value="https://www.myget.org/F/pomelo/api/v3/index.json" />
    <add key="nuget.org" value="https://www.nuget.org/api/v2" />
  </packageSources>
</configuration>

Getting Started

You are able to use MySQL in Entity Framework Core now, We have implemented MySQL Entity Framework Core interfaces. By using a few of lines to makes your project invoke Entity Framework Core with MySQL database. There is a console application sample for accessing MySQL database by using Entity Framework:

① Ensure utf8 is your MySQL database default charset.

show variables like 'character_set_database';

If the result is not utf8, you should modify your my.ini or my.cnf.

② Put Pomelo.EntityFrameworkCore.MySql into your project.json

{
  "version": "1.0.0-*",
  "buildOptions": {
    "emitEntryPoint": true
  },

  "tools": {
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"
  },

  "dependencies": {
    "Microsoft.NETCore.App": {
      "type": "platform",
      "version": "1.0.0"
    },
    "Pomelo.EntityFrameworkCore.MySql": "1.0.0",
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": "dnxcore50"
    }
  }
}

③ Implement some models, DbContext in Program.cs. Then overriding the OnConfiguring of DbContext to use MySQL database. Besides, you can define a JsonObject field if you are using MySQL Server 5.7. Finally to invoking MySQL with EF Core in your Main() method.

using System;
using System.Collections.Generic;
using System.Linq;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using Microsoft.EntityFrameworkCore;

namespace MySqlTest
{
    public class User
    {
        public int UserId { get; set; }

        [MaxLength(64)]
        public string Name { get; set; }
    }

    public class Blog
    {
        public Guid Id { get; set; }

        [MaxLength(32)]
        public string Title { get; set; }

        [ForeignKey("User")]
        public int UserId { get; set; }

        public virtual User User { get; set; }

        public string Content { get; set; }

        public JsonObject<List<string>> Tags { get; set; } // Json storage (MySQL 5.7 only)
    }

    public class MyContext : DbContext
    {
        public DbSet<Blog> Blogs { get; set; }

        public DbSet<User> Users { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
            => optionsBuilder
                .UseMySql(@"Server=localhost;database=ef;uid=root;pwd=19931101;");
    }

    public class Program
    {
        public static void Main()
        {
            using (var context = new MyContext())
            {
                // Create database
                context.Database.EnsureCreated();

                // Init sample data
                var user = new User { Name = "Yuuko" };
                context.Add(user);
                var blog1 = new Blog {
                    Title = "Title #1",
                    UserId = user.UserId,
                    Tags = new List<string>() { "ASP.NET Core", "MySQL", "Pomelo" }
                };
                context.Add(blog1);
                var blog2 = new Blog
                {
                    Title = "Title #2",
                    UserId = user.UserId,
                    Tags = new List<string>() { "ASP.NET Core", "MySQL" }
                };
                context.Add(blog2);
                context.SaveChanges();

                // Changing and save json object #1
                blog1.Tags.Object.Clear();
                context.SaveChanges();

                // Changing and save json object #2
                blog1.Tags.Object.Add("Pomelo");
                context.SaveChanges();

                // Output data
                var ret = context.Blogs
                    .Where(x => x.Tags.Object.Contains("Pomelo"))
                    .ToList();
                foreach (var x in ret)
                {
                    Console.WriteLine($"{ x.Id } { x.Title }");
                    Console.Write("[Tags]: ");
                    foreach(var y in x.Tags.Object)
                        Console.Write(y + " ");
                    Console.WriteLine();
                }
            }
            Console.Read();
        }
    }
}

By viewing the following full project which is a single-user blog system and based on this library(MySQL for Entity Framework Core) to explorer more features: View on GitHub.

Schedule and Roadmap

Milestone	Release week
1.0.0	Aug 5th 2016
1.0.1	Sep 2016

1.0.0 Feature complete

Support all Entity Framework Core operations, basic json field support.

1.0.1 Full json field support

Support translate JsonObject linq queries to native sql.

DB.Blogs.Where(x => x.Tags.Contains("MySQL")).ToList();

Translate to:

SELECT * FROM `Blogs` WHERE JSON_CONTAINS(`Tags`, '"MySQL"');

Contribute

One of the easiest ways to contribute is to participate in discussions and discuss issues. You can also contribute by submitting pull requests with code changes.

License

MIT