.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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