EF+Mysql+DDD框架搭建——code first准备

Posted 2020-07-04

准备mysql for vs工具

mysql-connector-net-6.8.3.msi 网盘地址：http://pan.baidu.com/s/1jHDWINk

mysql-for-visualstudio-1.1.4.msi 网盘地址：http://pan.baidu.com/s/1eSwemno

打开VS工具-》库程序包管理器-》程序包管理器控制平台

安装EF和mysql依赖包

1.PM>  Install-Package MySql.Data.Entity -Version 6.9.8

2.PM>  Install-Package EntityFramework

 

安装完成之后配置数据库连接字符串connectionStrings

<connectionStrings>
    <add name="MyContext" connectionString="Data Source=localhost;port=3307;Initial Catalog=mybook;user id=root;password=root;" providerName="MySql.Data.MySqlClient" />
  </connectionStrings>

在web项目中model文件夹下创建Users实体和MyUserContext上下文对象

Users实体类

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;

namespace PMS.Web.Models
{
    /// <summary>
    /// users实体对象
    /// </summary>
    public class Users
    {
        public int Id { get; set; }
        public string UserName { get; set; }

        //默认string映射到mysql里是longtext类型的，加长度之后就变成varchar了
        [MaxLength(30)]
        public string PassWord { get; set; }
    }
}

MyUserContext上下文对象

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;

namespace PMS.Web.Models
{
    [DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
    public class MyUserContext : DbContext
    {
        public MyUserContext()
            : base("name=MyContext")//web.config中connectionstring的名字
        {
        }

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

HomeController.cs

using PMS.Web.Models;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace PMS.Web.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            InitData();
            return View();
        }

        private void InitData()
        {
            Database.SetInitializer(new DropCreateDatabaseAlways<MyUserContext>());
            var context = new MyUserContext();
            //插入一行值
            context.Users.Add(new Users { UserName = "EF6-MySQL-Code-First" });
            context.SaveChanges();
        }
    }
}

运行项目，如果出现“无法检查模型兼容性，因为数据库不包含模型元数据。只能检查使用 Code First 或 Code First 迁移创建的数据库的模型兼容性。”

在Visual Studio中对其进行迁移

1.PM> Enable-Migrations

2.配置Configuration的AutomaticMigrationsEnabled属性

namespace PMS.Web.Migrations
{
    using System;
    using System.Data.Entity;
    using System.Data.Entity.Migrations;
    using System.Linq;

    internal sealed class Configuration : DbMigrationsConfiguration<PMS.Web.Models.MyUserContext>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = true;
        }

        protected override void Seed(PMS.Web.Models.MyUserContext context)
        {
            //  This method will be called after migrating to the latest version.

            //  You can use the DbSet<T>.AddOrUpdate() helper extension method
            //  to avoid creating duplicate seed data. E.g.
            //
            //    context.People.AddOrUpdate(
            //      p => p.FullName,
            //      new Person { FullName = "Andrew Peters" },
            //      new Person { FullName = "Brice Lambson" },
            //      new Person { FullName = "Rowan Miller" }
            //    );
            //
        }
    }
}

3.PM> Update-Database -Force

 

重新运行项目。此时已经可以正常运行