ASP.NET Core 1.0 中 EntityFramework 与 PostgreSQL 的使用

https://docs.efproject.net/en/latest/providers/npgsql/index.html

前面在CentOS6.7环境下配置好了PostgreSQL, 就顺便试了一下 ASP.NET Core 1.0 环境下EF与PostgreSQL的使用,就是.NET Core 还不支持CentOS，要么就可以部署一下试试。

依赖包

"dependencies": {
    "Microsoft.AspNet.Diagnostics": "1.0.0-rc1-final",
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-rc1-final",
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final",
    "Microsoft.AspNet.Tooling.Razor": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.FileProviderExtensions": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.Json": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging.Console": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging.Debug": "1.0.0-rc1-final",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-rc1-final",
    "EntityFramework.Commands": "7.0.0-rc1-final",
    "EntityFramework7.Npgsql": "3.1.0-rc1-3",
    "EntityFramework7.Npgsql.Design": "3.1.0-rc1-5"
  },
 
  "commands": {
    "web": "Microsoft.AspNet.Server.Kestrel",
    "ef": "EntityFramework.Commands"
  },

CODE FISRT

public class StockHqDbContext : DbContext
    {
        public DbSet<Blog> Blogs { get; set; }
        public DbSet<Post> Posts { get; set; }
 
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            // Make Blog.Url required
            modelBuilder.Entity<Blog>()
                        .Property(b => b.Url)
                        .IsRequired();
        }
    }
    public class Blog
    {
        public int BlogId { get; set; }
        public string Url { get; set; }
        public List<Post> Posts { get; set; }
    }
   public class Post
    {
        public int PostId { get; set; }
        public string Title { get; set; }
        public string Content { get; set; }
        public int BlogId { get; set; }
        public Blog Blog { get; set; }
    }

注册PostgreSqlProvider

public void ConfigureServices(IServiceCollection services)
        {
            var connection = Configuration["PostgreSqlProvider:ConnectionString"];
            services.AddEntityFramework()
                    .AddNpgsql()
                    .AddDbContext<StockHqDbContext>(options => options.UseNpgsql(connection));
            // Add framework services.
            services.AddMvc();
        }

配置文件

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Verbose",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "PostgreSqlProvider": {
    "ConnectionString": "User ID=postgres;Password=xxxxx;Host=xxx.xxx.xxx.xxx;Port=5432;Database=stockhq;Pooling=true;"
  }
}

执行命令

dnvm use 1.0.0-rc1-final(dnvm install 1.0.0-rc1-final)
dnx ef migrations add FirstMigration
dnx ef database update

构造页面

public class BlogsController : Controller
    {
        private StockHqDbContext _context;
 
        public BlogsController(StockHqDbContext context)
        {
            _context = context;
        }
 
        public IActionResult Index()
        {
            return View(_context.Blogs.ToList());
        }
 
        public IActionResult Create()
        {
            return View();
        }
 
        [HttpPost]
        [ValidateAntiForgeryToken]
        public IActionResult Create(Blog blog)
        {
            if (ModelState.IsValid)
            {
                _context.Blogs.Add(blog);
                _context.SaveChanges();
                return RedirectToAction("Index");
            }
 
            return View(blog);
        }
 
    }

视图

@model IEnumerable<StockHq.Models.Blog>
@{
    ViewBag.Title = "Blogs";
}
<h2>Blogs</h2>
<p>
    <a asp-controller="Blogs" asp-action="Create">Create New</a>
</p>
<table class="table">
    <tr>
        <th>Id</th>
        <th>Url</th>
    </tr>
    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.BlogId)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Url)
            </td>
        </tr>
    }
</table>
 
@model StockHq.Models.Blog
@{
    ViewBag.Title = "New Blog";
}
<h2>@ViewData["Title"]</h2>
<form asp-controller="Blogs" asp-action="Create" method="post" class="form-horizontal" role="form">
    <div class="form-horizontal">
        <div asp-validation-summary="ValidationSummary.All" class="text-danger"></div>
        <div class="form-group">
            <label asp-for="Url" class="col-md-2 control-label"></label>
            <div class="col-md-10">
                <input asp-for="Url" class="form-control" />
                <span asp-validation-for="Url" class="text-danger"></span>
            </div>
        </div>
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
</form>

访问：http://localhost:49648/Blogs/Create 增加数据，完事，睡觉。

REFER:
http://dotnet.github.io/getting-started

https://github.com/aspnet/EntityFramework

https://github.com/npgsql/npgsql

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