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.net Core连接MongoDB
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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>
<a asp-action="Detail" asp-route-ProvinceID="@item.ProvinceID">详 情</a>
<a asp-action="Delete" asp-route-ProvinceID="@item.ProvinceID">删 除</a>
</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
