1.使用nuget下载：
Microsoft.Extensions.Configuration.Json
Pomelo.EntityFrameworkCore.MySql
2.数据库中创建好表：
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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;
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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。
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{
"ConnectionStrings": {
"Default": "Server=127.0.0.1;Database=wdb;charset=utf8;uid=root;pwd=some;"
}
}
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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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原文链接：https://www.cnblogs.com/runliuv/p/15107430.html