entity framework core 2.0 & sqlite 配置教程

我用的是vs2017，需要下载.net core 2.0 sdk。

.net core 下载地址：点我下载

1.在Visual Studio之中创建一个.net core的控制台项目

2.修改csproj项目文件，注意添加 DotNetCliToolReference 节点，此节点为添加ef工具，不添加此节点无法使用dotnet ef系列命令

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="2.0.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="2.0.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />
  </ItemGroup>
  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />
  </ItemGroup>
</Project>

3.这是我的Programs.cs文件，循环输入字符串添加到数据库表中

using System;
using Microsoft.EntityFrameworkCore;
using Microsoft.Data.Sqlite;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;

namespace EfCore2Learn
{
    class User
    {
        [Key, DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
        public int Id { set; get; }

        [MaxLength(50), Required]
        public string Name { set; get; }
    }

    class MyContext : DbContext
    {
        public DbSet<User> Set_User { set; get; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            string cntString = "Data Source=MyTestDb.db";
            optionsBuilder.UseSqlite(cntString);
        }
    }

    class APP
    {
        public APP()
        {
            string inputStr = "";
            inputStr = Console.ReadLine();
            while (inputStr != "quit")
            {
                using (MyContext Db = new MyContext())
                {
                    User iUser = new User();
                    iUser.Name = inputStr;
                    Db.Set_User.Add(iUser);
                    Db.SaveChanges();
                }

                inputStr = Console.ReadLine();
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            APP App = new APP();
        }
    }
}

4.在项目目录下打开cmd（我这里是PowerShell）分别输入以下命令

dotnet restore

dotnet dotnet ef migrations add InitialCreate

dotnet ef database update

dotnet build

dotnet run

成功了，其实很简单，目前我配置好了SqlServer和Sqlite，但是MySql没有配置好，折腾了一天

这里是项目文件下载地址：点我下载项目文件