.net Core连接MongoDB

前两天在学习MongoDB相关的知识，做了个小Demo，做的是省份下面有多少所学校，嗯，做的比较粗暴。。。

连接MongoDB首先要通过Nuget添加一个MongoDB的包，下载此包

安装完毕后开始写代码了，创建一个省份实体，一个学校实体

using MongoDB.Bson.Serialization.Attributes;
using System.Collections.Generic;
namespace MongoCore.Models
{
    public class Province
    {
        [BsonId]
        public int ProvinceID { get; set; }

        public string ProvinceName { get; set; }
        /// <summary>
        /// 省份里有多个学校  这里用集合保存
        /// </summary>
        public IList<School> SchoolName { get; set; }
    }
}

namespace MongoCore.Models
{
        //用于后面添加学校
        public School(string schoolName, string years)
        {
            SchoolName = schoolName;
            Years = years;
        }
    public class School
    {
        public string SchoolName { get; set; }
        public string Years { get; set; }
    }
}

创建上下文类，连接MongoDB

namespace MongoCore.Models
{
    public class ProvinceContext
    {
        //定义数据库
        private readonly IMongoDatabase _database = null;

        public ProvinceContext()
        {
            //连接服务器名称  mongo的默认端口27017
            var client = new MongoClient("mongodb://.......:27017");
            if (client != null)
                //连接数据库
                _database = client.GetDatabase("数据库名");
        }

        public IMongoCollection<Province> Province
        {
            get
            {
                return _database.GetCollection<Province>("Province");
            }
        }
    }
}

创建控制器

  private readonly ProvinceContext _context = new ProvinceContext();
        public async Task<IActionResult> Index()
        {
            var list = await _context.Province.Find(_ => true).ToListAsync();
            return View(list);
        }

视图

@model List<MongoCore.Models.Province>
@{
    ViewData["Title"] = "Index";
}

<h2>Index</h2>
<h2>Index</h2>
<a asp-action="Create"><input type="button" value="新 建" class="btn btn-default" /></a>
<table class="table">
    <tr>
        <th>省份ID</th>
        <th>省份名称</th>
        <th>操作</th>
    </tr>
    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.ProvinceID)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.ProvinceName)
            </td>
            <td>
                <a asp-action="Insert" asp-route-ProvinceID="@item.ProvinceID">新 增</a>&nbsp;&nbsp;
                <a asp-action="Detail" asp-route-ProvinceID="@item.ProvinceID">详 情</a>&nbsp;&nbsp;
                <a asp-action="Delete" asp-route-ProvinceID="@item.ProvinceID">删 除</a>&nbsp;&nbsp;
            </td>
        </tr>
    }
</table>

运行的时候修改配置在Startup.cs里

运行效果是这样的，现在还没有数据，

点击新建按钮添加省份,这里我添加了湖北省

添加省份代码如下：后端

   public IActionResult Create()
        {
            return View();
        }
        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> Create(Province item)
        {
            try
            {

                //初始化学校类型数据
                item.SchoolName = new List<School>();

                await _context.Province.InsertOneAsync(item);
                return RedirectToAction(nameof(Index));
            }
            catch
            {
                return View();
            }
        }

视图：

@model MongoCore.Models.Province
@{
    ViewData["Title"] = "Create";
}

<h2>Create</h2>
<div class="row">
    <div class="col-md-4">
        <form asp-action="Create">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label class="control-label">省份ID</label>
                <input asp-for="ProvinceID" class="form-control" />
            </div>
            <div class="form-group">
                <label class="control-label">省份名称</label>
                <input asp-for="ProvinceName" class="form-control" />
            </div>
            <div class="form-group">
                <input type="submit" value="保 存" class="btn btn-default" />
            </div>
        </form>
    </div>
</div>

接下来就是添加省份下面的学校了

  public async Task<IActionResult> Insert(int ProvinceID)
        {
            var num = await _context.Province.Find(p => p.ProvinceID == ProvinceID).SingleOrDefaultAsync();
            return View(num);
        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Insert(int ProvinceID, string Years, string SchoolName)
        {
            var item = await _context.Province.Find(p => p.ProvinceID == ProvinceID).SingleOrDefaultAsync();
            School sl = new School(SchoolName,Years);
            //添加学校
            item.SchoolName.Add(sl);
            //更新
            ReplaceOneResult actionResult
               = await _context.Province
                               .ReplaceOneAsync(n => n.ProvinceID.Equals(ProvinceID)
                                       , item
                                       , new UpdateOptions { IsUpsert = true });
            return RedirectToAction(nameof(Index));
        }

视图：

@model MongoCore.Models.Province
@{
    ViewData["Title"] = "Insert";
}
<h2>新增</h2>
<div class="row">
    <div class="col-md-4">
        <form asp-action="Insert">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <input type="hidden" asp-for="ProvinceID" />
            <div class="form-group">
                <label class="control-label">学校名称</label>
                <input name="SchoolName" class="form-control" />
            </div>
            <div class="form-group">
                <label class="control-label">成立年份</label>
                <input name="Years" class="form-control" />
            </div>
            <div class="form-group">
                <input type="submit" value="保 存" class="btn btn-default" />
            </div>
        </form>
    </div>
</div>

然后添加学校，我添加了两所学校，在MongoDB里可以看到数据