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MongoDB入门教程之C#驱动操作实例

欧盛
2023-03-14
本文向大家介绍MongoDB入门教程之C#驱动操作实例,包括了MongoDB入门教程之C#驱动操作实例的使用技巧和注意事项,需要的朋友参考一下

作为系列的最后一篇,得要说说C#驱动对mongodb的操作,目前驱动有两种:官方驱动和samus驱动,不过我个人还是喜欢后者,

因为提供了丰富的linq操作,相当方便。

官方驱动:https://github.com/mongodb/mongo-csharp-driver/downloads。下载后,还提供了一个酷似msdn的帮助文档。

samus驱动:https://github.com/samus/mongodb-csharp/downloads。

下面就具体看看samus驱动,https://github.com/samus/mongodb-csharp/blob/master/examples/Simple/Main.cs上面提供了

一个简单的demo,大体上看看我们就知道怎么玩了。

一: 实践

1:我们建立一个Person实体,MongoAlias特性表示取别名,这里的ID值将会覆盖掉数据库自动生成的_id。


#region 数据实体

    /// <summary>

/// 数据实体

/// </summary>

    public class Person

    {

        [MongoAlias("_id")]

        public string ID { get; set; }

        public string Name { get; set; }

        public int Age { get; set; }

        public DateTime CreateTime { get; set; }     }     #endregion

2:初始化一些变量


string connectionString = string.Empty;

        string databaseName = string.Empty;

        string collectionName = string.Empty;

        static MongodbHelper<T> mongodb;

        #region 初始化操作 /// <summary> /// 初始化操作 /// </summary>         public MongodbHelper()         {             connectionString = "Server=127.0.0.1:2222";             databaseName = "shopex";             collectionName = "person";         }         #endregion

3:为了方便T的继承类使用linq功能,我们还需要映射一下。


#region 实现linq查询的映射配置

        /// <summary>

/// 实现linq查询的映射配置

/// </summary>

        public MongoConfiguration configuration

        {

            get

            {

                var config = new MongoConfigurationBuilder();

                config.Mapping(mapping =>                 {                     mapping.DefaultProfile(profile =>                     {                         profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));                     });                     mapping.Map<T>();                     mapping.Map<T>();                 });

                config.ConnectionString(connectionString);

                return config.BuildConfiguration();             }         }         #endregion

4:下面是一些基本的CURD的代码,跟写EF代码很类似,写起来好舒服。


#region 插入操作

        /// <summary>

/// 插入操作

/// </summary>

/// <param name="person"></param>

/// <returns></returns>

        public void Insert(T t)

        {

            using (Mongo mongo = new Mongo(configuration))

            {

                try

                {

                    mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    collection.Insert(t, true);

                    mongo.Disconnect();

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion

        #region 更新操作         /// <summary> /// 更新操作 /// </summary> /// <param name="person"></param> /// <returns></returns>         public void Update(T t, Expression<Func<T, bool>> func)         {             using (Mongo mongo = new Mongo(configuration))             {                 try                 {                     mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    collection.Update<T>(t, func, true);

                    mongo.Disconnect();

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion

        #region 获取集合         /// <summary> ///获取集合 /// </summary> /// <param name="person"></param> /// <returns></returns>         public List<T> List(int pageIndex, int pageSize, Expression<Func<T, bool>> func, out int pageCount)         {             pageCount = 0;

            using (Mongo mongo = new Mongo(configuration))             {                 try                 {                     mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    pageCount = Convert.ToInt32(collection.Count());

                    var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1))                                                    .Take(pageSize).Select(i => i).ToList();

                    mongo.Disconnect();

                    return personList;

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion

        #region 读取单条记录         /// <summary> ///读取单条记录 /// </summary> /// <param name="person"></param> /// <returns></returns>         public T Single(Expression<Func<T, bool>> func)         {             using (Mongo mongo = new Mongo(configuration))             {                 try                 {                     mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    var single = collection.Linq().FirstOrDefault(func);

                    mongo.Disconnect();

                    return single;

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion

        #region 删除操作         /// <summary> /// 删除操作 /// </summary> /// <param name="person"></param> /// <returns></returns>         public void Delete(Expression<Func<T, bool>> func)         {             using (Mongo mongo = new Mongo(configuration))             {                 try                 {                     mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    //这个地方要注意,一定要加上T参数,否则会当作object类型处理 //导致删除失败                     collection.Remove<T>(func);

                    mongo.Disconnect();

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion

5.   好,我们开一下2222端口,由于前前篇我已经把这个mongodb做成了服务,现在就直接连过去了,并做一下对Name的html" target="_blank">索引

6. 一切准备妥当,我们做下基本的操作,比如这里我添加一千条数据,注意我开启的是安全模式,如果插入不成功,将会抛出异常。

 <1> Add:

 


 static void Main(string[] args)

        {

            MongodbHelper<Person> helper = new MongodbHelper<Person>();

            //插入1000条数据             for (int i = 0; i < 1000; i++)             {                 helper.Insert(new Person()                 {                     ID = Guid.NewGuid().ToString(),                     Name = "jack" + i,                     Age = i,                     CreateTime = DateTime.Now                 });             }

            Console.WriteLine("插入成功");

            Console.Read();         }  


 乍一看显示的数据以为有问题,为什么没有出现jack0或者jack999,不过find的一下后心情舒坦了。

<2> update:   这里就把jack941的名字改掉“mary”


static void Main(string[] args)

        {

            MongodbHelper<Person> helper = new MongodbHelper<Person>();

            //修改jack941改成mary             var single = helper.Single(i => i.Name == "jack941");             single.Name = "mary";             helper.Update(single, i => i.ID == single.ID);

            Console.WriteLine("修改成功");             Console.Read();         }

<3>Delete:  删除mary这条记录


static void Main(string[] args)

        {

            MongodbHelper<Person> helper = new MongodbHelper<Person>();

            //删除mary这个记录             helper.Delete(i => i.Name == "mary");

            Console.WriteLine("删除成功");             Console.Read();         }

<4> list操作: 这里我获取一下名字里面带9的人数列表


static void Main(string[] args)

        {

            MongodbHelper<Person> helper = new MongodbHelper<Person>();

            int pagecount;

            //获取名字里面带9的人数             var list = helper.List(1, 20, i => i.Name.Contains("9"), out pagecount);

           Console.Read();         }

总的运行代码


using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Configuration;

using System.Linq.Expressions;

using MongoDB.Configuration; using MongoDB.Linq; using MongoDB.Attributes;

namespace MongoDB.Test {     public class MongodbHelper<T> where T : class     {         string connectionString = string.Empty;

        string databaseName = string.Empty;

        string collectionName = string.Empty;

        static MongodbHelper<T> mongodb;

        #region 初始化操作         /// <summary> /// 初始化操作 /// </summary>         public MongodbHelper()         {             connectionString = "Server=127.0.0.1:2222";             databaseName = "shopex";             collectionName = "person";         }         #endregion

        #region 实现linq查询的映射配置         /// <summary> /// 实现linq查询的映射配置 /// </summary>         public MongoConfiguration configuration         {             get             {                 var config = new MongoConfigurationBuilder();

                config.Mapping(mapping =>                 {                     mapping.DefaultProfile(profile =>                     {                         profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));                     });                     mapping.Map<T>();                     mapping.Map<T>();                 });

                config.ConnectionString(connectionString);

                return config.BuildConfiguration();             }         }         #endregion

        #region 插入操作         /// <summary> /// 插入操作 /// </summary> /// <param name="person"></param> /// <returns></returns>         public void Insert(T t)         {             using (Mongo mongo = new Mongo(configuration))             {                 try                 {                     mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    collection.Insert(t, true);

                    mongo.Disconnect();

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion

        #region 更新操作         /// <summary> /// 更新操作 /// </summary> /// <param name="person"></param> /// <returns></returns>         public void Update(T t, Expression<Func<T, bool>> func)         {             using (Mongo mongo = new Mongo(configuration))             {                 try                 {                     mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    collection.Update<T>(t, func, true);

                    mongo.Disconnect();

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion

        #region 获取集合         /// <summary> ///获取集合 /// </summary> /// <param name="person"></param> /// <returns></returns>         public List<T> List(int pageIndex, int pageSize, Expression<Func<T, bool>> func, out int pageCount)         {             pageCount = 0;

            using (Mongo mongo = new Mongo(configuration))             {                 try                 {                     mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    pageCount = Convert.ToInt32(collection.Count());

                    var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1))                                                    .Take(pageSize).Select(i => i).ToList();

                    mongo.Disconnect();

                    return personList;

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion

        #region 读取单条记录         /// <summary> ///读取单条记录 /// </summary> /// <param name="person"></param> /// <returns></returns>         public T Single(Expression<Func<T, bool>> func)         {             using (Mongo mongo = new Mongo(configuration))             {                 try                 {                     mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    var single = collection.Linq().FirstOrDefault(func);

                    mongo.Disconnect();

                    return single;

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion

        #region 删除操作         /// <summary> /// 删除操作 /// </summary> /// <param name="person"></param> /// <returns></returns>         public void Delete(Expression<Func<T, bool>> func)         {             using (Mongo mongo = new Mongo(configuration))             {                 try                 {                     mongo.Connect();

                    var db = mongo.GetDatabase(databaseName);

                    var collection = db.GetCollection<T>(collectionName);

                    //这个地方要注意,一定要加上T参数,否则会当作object类型处理 //导致删除失败                     collection.Remove<T>(func);

                    mongo.Disconnect();

                }                 catch (Exception)                 {                     mongo.Disconnect();                     throw;                 }             }         }         #endregion     }

    #region 数据实体     /// <summary> /// 数据实体 /// </summary>     public class Person     {         [MongoAlias("_id")]         public string ID { get; set; }

        public string Name { get; set; }

        public int Age { get; set; }

        public DateTime CreateTime { get; set; }     }     #endregion }

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