探索Aspnetcore+mysql+efcore-优快云博客

本文介绍如何在ASP.NET Core应用中使用EntityFramework Core操作MySQL数据库。通过具体步骤和示例代码，展示从创建项目、安装NuGet包、定义数据模型到实现基本的CRUD操作的全过程。

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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=397860

namespace 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>