entity framework core 生成 postgresql 数据库实体

.net core 2.0

使用db first 方式生成表和context

PM 控制台运行命令出错

Scaffold-DbContext "Host=localhost;Database=mydatabase;Username=myuser;Password=mypassword" Npgsql.EntityFrameworkCore.PostgreSQL

说找不到什么引用，找半天，有人说用dotnet ef 命令可用

，https://github.com/npgsql/Npgsql.EntityFrameworkCore.PostgreSQL/issues/190

需要使用

EF Core .NET Command-line Tools工具

https://docs.microsoft.com/en-us/ef/core/miscellaneous/cli/dotnet

需要安装包

Install-Package Microsoft.EntityFrameworkCore.Tool

Install-Package Npgsql.EntityFrameworkCore.PostgreSQL
Install-Package Npgsql.EntityFrameworkCore.PostgreSQL.Design

项目文件 .csprog

需添加配置，DotNetCliToolReference

参考：https://docs.microsoft.com/en-us/ef/core/miscellaneous/cli/dotnet

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.2" />
    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="2.0.1" />
    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL.Design" Version="1.1.1" />
  </ItemGroup>
   <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet"
                            Version="2.0.2" />
  </ItemGroup>

</Project>

注意引用的版本号，和本机的不一定一样，要匹配，不懂就装个最新的

Install-Package Microsoft.EntityFrameworkCore.Tools -Version 2.0.2

完成安装配置后，在项目目录执行

dotnet ef dbcontext scaffold "Host=localhost;Database=mydatabase;Username=myuser;Password=mypassword" Npgsql.EntityFrameworkCore.PostgreSQL
生成代码