8天学通MongoDB——第八天驱动实践

2022-05-23 23:52:45

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。

 1 #region 数据实体 2     /// <summary> 3 /// 数据实体 4 /// </summary> 5     public class Person 6     { 7         [MongoAlias("_id")] 8         public string ID { get; set; } 9 10         public string Name { get; set; }11 12         public int Age { get; set; }13 14         public DateTime CreateTime { get; set; }15     }16     #endregion

2：初始化一些变量

 1         string connectionString = string.Empty; 2  3         string databaseName = string.Empty; 4  5         string collectionName = string.Empty; 6  7         static MongodbHelper<T> mongodb; 8  9         #region 初始化操作10 /// <summary>11 /// 初始化操作12 /// </summary>13         public MongodbHelper()14         {15             connectionString = "Server=127.0.0.1:2222";16             databaseName = "shopex";17             collectionName = "person";18         }19         #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。

 1 #region 实现linq查询的映射配置 2         /// <summary> 3 /// 实现linq查询的映射配置 4 /// </summary> 5         public MongoConfiguration configuration 6         { 7             get 8             { 9                 var config = new MongoConfigurationBuilder();10 11                 config.Mapping(mapping =>12                 {13                     mapping.DefaultProfile(profile =>14                     {15                         profile.SubClassesAre(t => t.IsSubclassOf(typeof(T)));16                     });17                     mapping.Map<T>();18                     mapping.Map<T>();19                 });20 21                 config.ConnectionString(connectionString);22 23                 return config.BuildConfiguration();24             }25         }26         #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。

  1     #region 插入操作  2         /// <summary>  3 /// 插入操作  4 /// </summary>  5 /// <param name="person"></param>  6 /// <returns></returns>  7         public void Insert(T t)  8         {  9             using (Mongo mongo = new Mongo(configuration)) 10             { 11                 try 12                 { 13                     mongo.Connect(); 14  15                     var db = mongo.GetDatabase(databaseName); 16  17                     var collection = db.GetCollection<T>(collectionName); 18  19                     collection.Insert(t, true); 20  21                     mongo.Disconnect(); 22  23                 } 24                 catch (Exception) 25                 { 26                     mongo.Disconnect(); 27                     throw; 28                 } 29             } 30         } 31         #endregion 32  33         #region 更新操作 34         /// <summary> 35 /// 更新操作 36 /// </summary> 37 /// <param name="person"></param> 38 /// <returns></returns> 39         public void Update(T t, Expression<Func<T, bool>> func) 40         { 41             using (Mongo mongo = new Mongo(configuration)) 42             { 43                 try 44                 { 45                     mongo.Connect(); 46  47                     var db = mongo.GetDatabase(databaseName); 48  49                     var collection = db.GetCollection<T>(collectionName); 50  51                     collection.Update<T>(t, func, true); 52  53                     mongo.Disconnect(); 54  55                 } 56                 catch (Exception) 57                 { 58                     mongo.Disconnect(); 59                     throw; 60                 } 61             } 62         } 63         #endregion 64  65         #region 获取集合 66         /// <summary> 67 ///获取集合 68 /// </summary> 69 /// <param name="person"></param> 70 /// <returns></returns> 71         public List<T> List(int pageIndex, int pageSize, Expression<Func<T, bool>> func, out int pageCount) 72         { 73             pageCount = 0; 74  75             using (Mongo mongo = new Mongo(configuration)) 76             { 77                 try 78                 { 79                     mongo.Connect(); 80  81                     var db = mongo.GetDatabase(databaseName); 82  83                     var collection = db.GetCollection<T>(collectionName); 84  85                     pageCount = Convert.ToInt32(collection.Count()); 86  87                     var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1)) 88                                                    .Take(pageSize).Select(i => i).ToList(); 89  90                     mongo.Disconnect(); 91  92                     return personList; 93  94                 } 95                 catch (Exception) 96                 { 97                     mongo.Disconnect(); 98                     throw; 99                 }100             }101         }102         #endregion103 104         #region 读取单条记录105         /// <summary>106 ///读取单条记录107 /// </summary>108 /// <param name="person"></param>109 /// <returns></returns>110         public T Single(Expression<Func<T, bool>> func)111         {112             using (Mongo mongo = new Mongo(configuration))113             {114                 try115                 {116                     mongo.Connect();117 118                     var db = mongo.GetDatabase(databaseName);119 120                     var collection = db.GetCollection<T>(collectionName);121 122                     var single = collection.Linq().FirstOrDefault(func);123 124                     mongo.Disconnect();125 126                     return single;127 128                 }129                 catch (Exception)130                 {131                     mongo.Disconnect();132                     throw;133                 }134             }135         }136         #endregion137 138         #region 删除操作139         /// <summary>140 /// 删除操作141 /// </summary>142 /// <param name="person"></param>143 /// <returns></returns>144         public void Delete(Expression<Func<T, bool>> func)145         {146             using (Mongo mongo = new Mongo(configuration))147             {148                 try149                 {150                     mongo.Connect();151 152                     var db = mongo.GetDatabase(databaseName);153 154                     var collection = db.GetCollection<T>(collectionName);155 156                     //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157 //导致删除失败158                     collection.Remove<T>(func);159 160                     mongo.Disconnect();161 162                 }163                 catch (Exception)164                 {165                     mongo.Disconnect();166                     throw;167                 }168             }169         }170         #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:

 1    static void Main(string[] args) 2         { 3             MongodbHelper<Person> helper = new MongodbHelper<Person>(); 4  5             //插入1000条数据 6             for (int i = 0; i < 1000; i++) 7             { 8                 helper.Insert(new Person() 9                 {10                     ID = Guid.NewGuid().ToString(),11                     Name = "jack" + i,12                     Age = i,13                     CreateTime = DateTime.Now14                 });15             }16 17             Console.WriteLine("插入成功");18 19             Console.Read();20         }

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”

 1  static void Main(string[] args) 2         { 3             MongodbHelper<Person> helper = new MongodbHelper<Person>(); 4  5             //修改jack941改成mary 6             var single = helper.Single(i => i.Name == "jack941"); 7             single.Name = "mary"; 8             helper.Update(single, i => i.ID == single.ID); 9 10             Console.WriteLine("修改成功");11             Console.Read();12         }

<3>Delete：删除mary这条记录

 1      static void Main(string[] args) 2         { 3             MongodbHelper<Person> helper = new MongodbHelper<Person>(); 4  5             //删除mary这个记录 6             helper.Delete(i => i.Name == "mary"); 7  8             Console.WriteLine("删除成功"); 9             Console.Read();10         }

<4> list操作：这里我获取一下名字里面带9的人数列表

 1    static void Main(string[] args) 2         { 3             MongodbHelper<Person> helper = new MongodbHelper<Person>(); 4  5             int pagecount; 6  7             //获取名字里面带9的人数 8             var list = helper.List(1, 20, i => i.Name.Contains("9"), out pagecount); 9 10            Console.Read();11         }

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
}

趁着3天的休假，不断的努力终于把这个系列写完了，很感谢一直关注此系列的朋友。

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