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NET5控制台程序使用EF连接MYSQL
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：
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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; }
}
}
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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
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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);}
}
}
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6.使用
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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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