.NET5控制檯程式使用EF連線MYSQL資料庫的方法
阿新 • • 發佈:2021-08-09
1.使用nuget下載:
Microsoft.Extensions.Configuration.on
Pomelo.EntityFrameworkCore.
2.中建立好表:
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.新建實體類:
using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema; namespace ConsoleApp1 { public class user2 { [Key] //主鍵 [DatabaseGenerated(DatabaseGeneratedOption.Identity)] //設定自增 public int mid { get; set; } public string uname { get; set; } public string memo { get; set; } } }
4.新建一個json配置檔案:appsettings.json,設定為始終複製。
{ "ConnectionStrings": { "Default": "Server=127.0.0.1;Database=wdb;charset=utf8;uid=root;pwd=some;" } }
5.新建DbContext
using Microwww.cppcns.comsoft.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 gmBiTApgWConsoleApp1;
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 = "張三" + 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.gmBiTApgWMessage} ");
}
}
Console.WriteLine("Hello World!");http://www.cppcns.com
}
}
}
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