.Net6 + GraphQL + MongoDb 项目搭建

介绍

讲一下GraphQL的各种特性和如何使用，让大家感受下。

CODE4NOTHING大佬之前在博客园更新了一些GraphQL的知识是和EF的结合使用，文章使用的实体模型来自于CODE4NOTHING大佬。

本节主要将项目的结构简单搭建下

正文

新建一个空的.Net6 项目，不需要引入Swagger, 项目引入一下库，我们使用的MongoDb来做持久化

  <ItemGroup>
    <PackageReference Include="GraphQL.Server.Ui.Voyager" Version="7.1.1" />
    <PackageReference Include="HotChocolate.AspNetCore" Version="12.15.0" />
    <PackageReference Include="HotChocolate.Data" Version="12.15.0" />
    <PackageReference Include="HotChocolate.Data.MongoDb" Version="12.15.0" />
    <PackageReference Include="MongoDB.Driver" Version="2.19.0" />
    <PackageReference Include="MongoDB.Driver.Core" Version="2.19.0" />
  </ItemGroup>

为了接下来方便使用MongoDb我们先做一下简单封装，新建Db文件夹存放

    public class DatabaseSettings
    {
        public string ConnectionString { get; set; } = null!;

        public string DatabaseName { get; set; } = null!;
    }



public class BaseDbContext
    {

        public BaseDbContext(IOptions<DatabaseSettings> bookStoreDatabaseSettings)
        {
            var mongoConnectionUrl = new MongoUrl(bookStoreDatabaseSettings.Value.ConnectionString);
            var mongoClientSettings = MongoClientSettings.FromUrl(mongoConnectionUrl);
            mongoClientSettings.ClusterConfigurator = cb => {
                cb.Subscribe<CommandStartedEvent>(e => {
                    Console.WriteLine($"{e.CommandName} - {e.Command.ToJson()}");
                });
            };


            Client = new MongoClient(
                mongoClientSettings);

            Database = Client.GetDatabase(
                bookStoreDatabaseSettings.Value.DatabaseName);
        }

        /// <summary>
        /// MongoClient
        /// </summary>
        public IMongoClient Client { get; private set; } = default!;

        public IMongoDatabase Database { get; private set; } = default!;
    }


    public class DbContext : BaseDbContext
    {
        /// <summary>
        ///
        /// </summary>
        public IMongoCollection<Post> Post => Database.GetCollection<Post>("post");

        public IMongoCollection<Comment> Comments => Database.GetCollection<Comment>("Comment");

        public DbContext(IOptions<DatabaseSettings> bookStoreDatabaseSettings) : base(bookStoreDatabaseSettings)
        {
          
        }
    }

appsetting.json加上数据库链接

"DatabaseSettings": {
    "ConnectionString": "mongodb://localhost:27017",
    "DatabaseName": "GQL_Example"
  },

新建Post和Comment实体, 新建Model文件夹存放

    public class Post
    {
        [BsonId]
        [BsonRepresentation(BsonType.ObjectId)]
        public string? Id { get; set; }
        public string Title { get; set; }
        public string Author { get; set; }
        public string Abstraction { get; set; } 
        public string Content { get; set; }
        public string Link { get; set; }
        public DateTime PublishedAt { get; set; }
        public IReadOnlyList<Comment> Comments { get; init; }
    }

    public class Comment
    {
        [BsonId]
        [BsonRepresentation(BsonType.ObjectId)]
        public string? Id { get; set; }
        public string? Content { get; set; }
        public string? Name { get; set; }
        public DateTime CreatedAt { get; set; }
    }

初始化Program

using Gql.EmptyExample;
using Gql.EmptyExample.Posts.Core.Domain;
using GraphQL.Server.Ui.Voyager;
using HotChocolate.Types.Pagination;
using MongoDB.Bson;

var builder = WebApplication.CreateBuilder(args);


builder.Services.Configure<DatabaseSettings>(
    builder.Configuration.GetSection("DatabaseSettings"));

builder.Services.AddSingleton<DbContext>();

builder.Services
    .AddGraphQLServer();

// Add services to the container.

var app = builder.Build();


if (app.Environment.IsDevelopment())
{
    app.UseRouting().UseEndpoints(endpoints =>
    {
        endpoints.MapGraphQL();
    });

    app.UseGraphQLVoyager("/graphql-voyager", new VoyagerOptions { GraphQLEndPoint = "/graphql" });

}

// Configure the HTTP request pipeline.

app.UseHttpsRedirection();

app.Run();

结语

本系列主要将GraphQL的使用，示例项目不能应用于生产，后续发一些GraphQL库出来讲解生产中的实际应用

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