.NET5控制台程序使用EF连接MYSQL数据库的方法

1.使用nuget下载：

Microsoft.Extensions.Configuration.Json

Pomelo.EntityFrameworkCore.MySql

2.数据库中创建好表：

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;

3.新建实体类：

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; } } }

4.新建一个json配置文件：appsettings.json，设置为始终复制。

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

5.新建DbContext

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); } } }

6.使用

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!"); } } }

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