net core 2.1 EFcore CodeFirst 使用Mysql数据库

一、在nuget中分别安装1、 Pomelo.EntityFrameworkCore.MySql

2、Pomelo.EntityFrameworkCore.MySql.Design

3、Microsoft.EntityFrameworkCore.Tools

二、创建一个模型类 Person

public class Person
{
public long Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
public bool? Gender { get; set; }
}

三、创建数据上下文MyDbContext

public class MyDbContext : DbContext
{
public DbSet<Person> Persons { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
base.OnConfiguring(optionsBuilder);
optionsBuilder.UseMySQL("Server=127.0.0.1;database=testdb;uid=root;password=pwd123456;TreatTinyAsBoolean=true");//配置连接字符串必须TreatTinyAsBoolean=true 如果不加 bool类型会自动转化成bit类型疯狂报错
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
var etPerson = modelBuilder.Entity<Person>().ToTable("t_persons");
etPerson.Property(e => e.Age).IsRequired();//不写IsRequired,默认为可空
etPerson.Property(e => e.Gender).IsRequired();
etPerson.Property(e => e.Name).HasMaxLength(20).IsRequired();
}