摘要

之前尝试了，新建asp.net core站点，那么如何和mysql建立连接，如果操作mysql？本篇将尝试使用EntityFrameworkCore进行mysql的操作。

一个例子

首先新建一个空的Asp.net core站点，如图

安装MySql.Data.EntityFrameworkCore

http://www.nuget.org/packages/MySql.Data.EntityFrameworkCore/7.0.5-IR21

安装成功

这时你可以在project.json中看到MySql.Data.EntityFrameworkCore依赖的配置

新建一个User类

   public class User
   {        public int Id { set; get; }        public string Name { set; get; }        public DateTime Dt { set; get; } = DateTime.Now;
   }

这里使用 db first方式进行数据库的操作，添加一个test的数据库，然后新建一个user表

添加数据库上下文类。

using Microsoft.EntityFrameworkCore;using MySQL.Data.EntityFrameworkCore.Extensions;using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;using Wolfy.EfMySql.Models;namespace Wolfy.EfMySql.Data
{    public class TestContext : DbContext
   {        public DbSet<User> User { set; get; }        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)            => optionsBuilder.UseMySQL(@"Server=localhost;database=test;uid=root;pwd=123456");
   }
}

添加控制器

using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;using Microsoft.AspNetCore.Mvc;using Wolfy.EfMySql.Data;using Wolfy.EfMySql.Models;// For more information on enabling MVC for empty projects, visit http://go.microsoft.com/fwlink/?LinkID=397860namespace Wolfy.EfMySql.Controllers
{    public class HomeController : Controller
   {        // GET: /<controller>/
       public IActionResult Index()
       {            var db = new TestContext();
           db.Add(new User { Name = "Hello world" });
           db.SaveChanges();            var lst = db.Set<User>().ToList();            return View(lst);
       }
   }
}

添加路由

using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;using Microsoft.AspNetCore.Builder;using Microsoft.AspNetCore.Hosting;using Microsoft.AspNetCore.Http;using Microsoft.Extensions.DependencyInjection;using Microsoft.Extensions.Logging;namespace Wolfy.EfMySql
{    public class Startup
   {        // This method gets called by the runtime. Use this method to add services to the container.        // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
       public void ConfigureServices(IServiceCollection services)
       {
           
       }        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
       public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
       {
           loggerFactory.AddConsole();            if (env.IsDevelopment())
           {
               app.UseDeveloperExceptionPage();
           }
           app.UseMvc(routes =>
           {
               routes.MapRoute(name: "default", template: "{controller=Home}/{action=index}");
           });

       }
   }
}

浏览Index

通过上面，可以看出，是没有添加mvc服务，引起的，修改如下：

       public void ConfigureServices(IServiceCollection services)
       {
           services.AddMvc();
       }

视图

@*
   For more information on enabling MVC for empty projects, visit http://go.microsoft.com/fwlink/?LinkID=397860*@
@model List<Wolfy.EfMySql.Models.User>
<ul style="list-style-type:none;">
   @foreach (var item in Model)
   {        <li>@item.Id   @item.Name   @item.Dt.ToString("yyyy-MM-dd HH:mm:ss")</li>
   }</ul>

刷新页面

结语

这里算是尝尝鲜。关于asp.net core的更多内容，需要参考https://www.asp.net/core