九、.net core用orm继承DbContext(数据库上下文)方式操作数据库

using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace DotNetCore.Models
{
    public class DataContext:DbContext
    {
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            //配置MySql连接字符串/SqlServer连接字符串皆可
            optionsBuilder.UseMySql("Server=47.94.174.85;Database=testDb; User=testDb;Password=testDb;");
        }
        public class t_testModel
        {
            public int id { get; set; }
            public string name { get; set; }
            public string pass { get; set; }
        }
        //添加表实体
        public DbSet<t_testModel> friends { get; set; }
    }
}　　

            DataContext context = new DataContext();
         
            List<t_testModel> list = context.friends.ToList();
            return Content(list.ToString());

DROP TABLE IF EXISTS `friends`;
CREATE TABLE `friends` (
  `id` int(3) NOT NULL,
  `name` varchar(8) NOT NULL,
  `pass` varchar(20) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 
INSERT INTO `friends` VALUES (‘4‘, ‘王六‘, ‘dasd‘);