通过Mysql连接ASP.Net Core2.0(Code First模式)

ASP.NET Core2.0连接Mysql,首先新建项目

选择Web应用程序

选择需要身份验证:

通过Nuget安装Mysql驱动,这里推荐>Pomelo.EntityFrameworkCore.MySql(记得勾选预览版,目前只有此版本,虽然是预览,但是有rtm标识,所以放心就好)

具体使用细则,请参考:Pomelo.EntityFrameworkCore.MySql使用细则

增加Startup类中对Mysql的支持

把默认的options.UseSqlServer修改为options.UseMySql

 

public void ConfigureServices(IServiceCollection services)
        {
            //services.AddDbContext<ApplicationDbContext>(options =>
            //    options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

            services.AddDbContext<ApplicationDbContext>(options =>
               options.UseMySql(Configuration.GetConnectionString("MySqlConnection")));//Mysql支持

            services.AddIdentity<ApplicationUser, IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders();

            services.AddMvc()
                .AddRazorPagesOptions(options =>
                {
                    options.Conventions.AuthorizeFolder("/Account/Manage");
                    options.Conventions.AuthorizePage("/Account/Logout");
                });

            // Register no-op EmailSender used by account confirmation and password reset during development
            // For more information on how to enable account confirmation and password reset please visit https://go.microsoft.com/fwlink/?LinkID=532713
            services.AddSingleton<IEmailSender, EmailSender>();
        }

Mysql实例信息:uid;root     pwd:111111

打开appsettings.json文件,配置Mysql的连接字符串信息:

{
    "ConnectionStrings": {
        //"DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=aspnet-ASP.NETCore20ToMysql-53bc9b9d-9d6a-45d4-8429-2a2761773502;Trusted_Connection=True;MultipleActiveResultSets=true",
        "MySqlConnection": "Server=localhost;database=ASP.NetCore-Mysql;uid=root;pwd=111111;"
    },
    "Logging": {
        "IncludeScopes": false,
        "LogLevel": {
            "Default": "Warning"
        }
    }
}

 运行网站,效果如下:

此时还未与数据库通信,需要触发如登录,注册等需要连接数据库的动作时,才会通过EF与数据库通信,并且发挥CodeFirst的作用,由应用程序的Model建立数据库的表结构,此处可点击Login后登录出现如下界面:

 

第一次运行会出现如下错误,是由于实体与数据库不统一,需要迁移所致,点击ApplyMigrations同意迁移后刷新网页即可

此时,打开Mysql数据库查看数据库是否新建成功

perfect,达到了预期效果

CodeFirst模式真是微软EF的一大利器,高效开发数据库应用必备哈

还有一种dbfirst模式：

执行以下命令创建实体：

Scaffold-DbContext "Data Source=.;Initial Catalog=Blogging;Integrated Security=True" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models(Models是文件夹)

命令格式为：Scaffold-DbContext "Data Source=.;Initial Catalog=Blogging;Integrated Security=True" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models