CREATE TABLE `user2` (

  `mid` int NOT NULL AUTO_INCREMENT,

  `uname` varchar(45) NOT NULL,

  `memo` varchar(200) DEFAULT NULL,

  PRIMARY KEY (`mid`)

) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

using System.ComponentModel.DataAnnotations;

using System.ComponentModel.DataAnnotations.Schema;

namespace ConsoleApp1

{

    public class user2

    {

        [Key] //主键

        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]  //设置自增

        public int mid { get; set; }

        public string uname { get; set; }

        public string memo { get; set; }

    }

}

{

  "ConnectionStrings": {

    "Default": "Server=127.0.0.1;Database=wdb;charset=utf8;uid=root;pwd=some;"

  }

}

using Microsoft.EntityFrameworkCore;

using Microsoft.Extensions.Configuration;

using System.IO;

namespace ConsoleApp1

{

    public class DefaultDbContext : DbContext

    {          

        private IConfiguration configuration;

        public DefaultDbContext()

        {

            configuration = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json").Build();

        }

        public DbSet<user2> user2 { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

            string connStr = configuration.GetConnectionString("Default");

            optionsBuilder.UseMySql(connStr, ServerVersion.AutoDetect(connStr),null);

        }

    }

}

using ConsoleApp1;

using System;

using System.Linq;

namespace Net5ConsoleMySql

{

    class Program

    {

        static void Main(string[] args)

        {

            try

            {

                DefaultDbContext context = new DefaultDbContext();

                Random rnd = new Random();

                string i = rnd.Next(1000, 9000).ToString();

                user2 zhangsan = new user2 { uname = "张三" + i, memo = i };

                user2 lisi = new user2 { uname = "李四" + i, memo = i };

                context.user2.AddRange(zhangsan, lisi);

                context.SaveChanges();

                var users = context.user2.ToList();

                foreach (var user in users)

                {

                    Console.WriteLine($"{user.mid} {user.uname} {user.memo}");

                }

            }

            catch (Exception ex)

            {

                Console.WriteLine($"EX: {ex.Message}  ");

                if (ex.InnerException != null)

                {

                    Console.WriteLine($"INNER EX: {ex.InnerException.Message}  ");

                }

            }

            Console.WriteLine("Hello World!");

        }

    }

}