选择VS工具》NuGet包管理器》程序包管理器控制台执行下面命令进行生成。

PM>  Install-Package Microsoft.EntityFrameworkCore.SqlServer   
PM> Install-Package Microsoft.EntityFrameworkCore.Tools
PM> Install-Package Microsoft.EntityFrameworkCore.SqlServer.Design
Scaffold-DbContext "Server=.;Database=st_DB;Integrated Security=True;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models （-force（重写加这个））

PM>  Install-Package MySql.Data.EntityFrameworkCore -Pre
PM> Install-Package Pomelo.EntityFrameworkCore.MySql
PM> Install-Package Microsoft.EntityFrameworkCore.Tools
PM> Install-Package Microsoft.VisualStudio.Web.CodeGeneration.Design
PM> Scaffold-DbContext "server=localhost;userid=root;pwd=;port=3306;database=st_film;sslmode=none;" Pomelo.EntityFrameworkCore.MySql -OutputDir EF -Force