mongodb c# driver(驱动)介绍

目前基于C#的mongodb驱动有两种，分别是官方驱动(下载地址)和samus驱动(下载地址)。
本次我们只演示官方驱动的使用方法。
官方驱动文档查看

第一步：引用驱动dll

引用驱动有两种方式：
1. 根据上面的下载地址下载对应的版本，然后引用到项目中。
2. 在项目的引用上右击->管理NuGet程序包(首先确保安装了nuget扩展包)->联机搜索官方驱动dll(搜索条件是 “Official MongoDB”)->安装成功后会引用3个dll(MongoDB.Driver和MongoDB.Bson，Newtonsoft.Json)。

第二步：构造MongodbHelper类

代码如下：

using MongoDB.Driver;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Server.DAL.DBHelper{    public sealed class MongodbHelper    {        static public readonly MongodbHelper Instance = new MongodbHelper();        private MongoDatabase db;        private MongodbHelper()        {            //http://www.studyofnet.com/news/337.html            //mongodb://[username:password@]host1[:port1][,host2[:port2],…[,hostN[:portN]]][/[database][?options]]            string strconn = "mongodb://sa:123456@127.0.0.1:27017";            string dbName = "test";            MongoDB.Driver.MongoClient mongoClient = new MongoClient(strconn);            MongoServer server = mongoClient.GetServer();            db = server.GetDatabase(dbName);        }        public MongoDatabase DB        {            get { return db; }        }        public MongoCollection this[string value]        {            get            {                return db.GetCollection(value);            }        }     }}

第三步：添加实体对象

在此建立的是一个复杂person对象，如下代码：

 public class Test:BaseEntity{}public class PersonType : BaseEntity{    public string Code { get; set; }    public string Display { get; set; }}public class Person : BaseEntity{    //如果对应多个分类，则格式为:,3,34,2    public string PersonType { get; set; }    public string Name { get; set; }    public bool Sex { get; set; }    public int Age { get; set; }    public DateTime AddTime { get; set; }    public List<Address> Addresses { get; set; }    public List<string> Courses { get; set; }}public class Address{    public string Province { get; set; }    public string City { get; set; }}

BaseEntity说明

BaseEntity中放的是mongodb数据库中自动生成的_id（类型是ObjectId）

 public class BaseEntity{    /// <summary>    /// 字段映射，告诉mongodb这个字段在数据库中对应_id    /// </summary>    [BsonId]    //告诉mongodb这个字段在数据库中的类型是ObjectId    [BsonRepresentation(BsonType.ObjectId)]    public string _id { get; set; }}

第四步：创建ApiController

创建ApiController基类BaseApiController

BaseApiController中会初始化一些变量，代码如下：

    public class BaseApiController : ApiController    {              public int skip, take;        public MongoDatabase db;        public MongoCollection col = null;//用于直接返回查询的json               public BaseApiController(string collectionName)        {                      skip = GetIntRequest("skip");            take = GetIntRequest("take");            if (skip == 0 && take == 0)            {                take = int.MaxValue;            }            db = Server.DAL.DBHelper.MongodbHelper.Instance.DB;            col = db.GetCollection(collectionName);        }        public string GetStringRequest(string paramter)        {            return HttpContext.Current.Request.QueryString[paramter] ?? "";        }        public int GetIntRequest(string paramter)        {            string tmp = HttpContext.Current.Request.QueryString[paramter] ?? "";            int tag = 0;            int.TryParse(tmp, out tag);            return tag;        }    }   

创建TestController继承BaseApiController

我们就用TestController来演示CURD.
具体代码如下，不再做详细说明：

public class TestController : Filter.BaseApiController{    public TestController()        : base("Person")    {    }    public string Post([FromBody]object value)    {                   var model = JsonConvert.DeserializeObject<Person>(value.ToString());        model._id = ObjectId.GenerateNewId().ToString();        try        {            col.Insert(model);            return model._id;        }        catch (WebException ex)        {            throw ex;        }    }           public object Get()    {        try        {            IEnumerable<Person> queryable = col.AsQueryable<Person>();            Func<Person, bool> where = null;            //有多少条件并多少条件            //like            //var name = GetStringRequest("Name");            if (!string.IsNullOrEmpty(name))            {                where = c => c.Name.Contains(name);                queryable = queryable.Where(where);            }            //单个条件等值查询            var personType = GetStringRequest("personType");            if (!string.IsNullOrEmpty(personType))            {                where = c => c.PersonType == personType;                queryable = queryable.Where(where);            }            //嵌套数组查询            var course = GetStringRequest("course");            if (!string.IsNullOrEmpty(course))            {                where = c => c.Courses.Contains(course);                queryable = queryable.Where(where);            }            //嵌套实体集合查询---查数量            var address = GetStringRequest("address");            if (!string.IsNullOrEmpty(address))            {                where = c => c.Addresses.Count > GetIntRequest("address");                queryable = queryable.Where(where);            }            var personList = queryable.OrderByDescending(c => c._id).Skip(skip).Take(take).ToList();            var count = queryable.Count();            var data = http://www.mamicode.com/new { count = count, dataList = personList };"_id", ObjectId.Parse(id) } };            var dicData = http://www.mamicode.com/JsonConvert.DeserializeObject>(value.ToString());"$set", new QueryDocument(dicData) } };            col.Update(query, update);            return 1;        }        catch (WebException ex)        {            throw ex;        }    }    //完全修改模式，先查后改，支持任意类型的对象的修改。缺点是需要先查询一次    public int Put([FromBody]object value)    {        try        {            var model = JsonConvert.DeserializeObject<Person>(value.ToString());            col.Save(model);            return 1;        }        catch (WebException ex)        {            throw ex;        }    }    public void Delete(string id)    {        try        {            var query = new QueryDocument { { "_id", ObjectId.Parse(id) } };            col.Remove(query);                      }        catch (WebException ex)        {            throw ex;        }    }}

第五步：CURD演示

在这里我们使用一个工具Fiddler2演示。

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mongodb c# driver(驱动)介绍及CURD