8天學會MongoDB——第八天驅動實踐

2020-03-14 13:12:27

字體：大中小

來源：轉載

供稿：網友

作為系列的最后一篇，得要說說C#驅動對mongodb的操作，目前驅動有兩種：官方驅動和samus驅動，不過我個人還是喜歡后者，

因為提供了豐富的linq操作，相當方便。

號外：博主的《完整版MongoDB 3.0 視頻教程 》正在淘寶熱銷，購買的請抓緊喲!

官方驅動：https://github.com/mongodb/mongo-csharp-driver/downloads。下載后，還提供了一個酷似msdn的幫助文檔。

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

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

一個簡單的demo，大體上看看我們就知道怎么玩了。

一：實踐

1：我們建立一個Person實體，MongoAlias特性表示取別名，這里的ID值將會覆蓋掉數據庫自動生成的_id。

 1 #region 數據實體 2     /// <summary> 3 /// 數據實體 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：初始化一些變量

 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：為了方便T的繼承類使用linq功能，我們還需要映射一下。

 1 #region 實現linq查詢的映射配置 2         /// <summary> 3 /// 實現linq查詢的映射配置 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的代碼，跟寫EF代碼很類似，寫起來好舒服。

  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 獲取集合 66         /// <summary> 67 ///獲取集合 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 讀取單條記錄105         /// <summary>106 ///讀取單條記錄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 刪除操作139         /// <summary>140 /// 刪除操作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                     //這個地方要注意，一定要加上T參數，否則會當作object類型處理157 //導致刪除失敗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，我們開一下2222端口，由于前前篇我已經把這個mongodb做成了服務，現在就直接連過去了，并做一下對Name的索引。

MongoDB,驅動實踐

6. 一切準備妥當，我們做下基本的操作，比如這里我添加一千條數據，注意我開啟的是安全模式，如果插入不成功，將會拋出異常。

<1> Add:

 1    static void Main(string[] args) 2         { 3             MongodbHelper<Person> helper = new MongodbHelper<Person>(); 4  5             //插入1000條數據 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         }

MongoDB,驅動實踐

乍一看顯示的數據以為有問題，為什么沒有出現jack0或者jack999，不過find的一下后心情舒坦了。

<2> update: 這里就把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         }

MongoDB,驅動實踐

<3>Delete：刪除mary這條記錄

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

MongoDB,驅動實踐

<4> list操作：這里我獲取一下名字里面帶9的人數列表

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

MongoDB,驅動實踐

總的運行代碼

			
  1 using System;  2 using System.Collections.Generic;  3 using System.Linq;  4 using System.Text;  5 using System.Configuration;  6 using System.Linq.Expressions;  7   8 using MongoDB.Configuration;  9 using MongoDB.Linq; 10 using MongoDB.Attributes; 11  12  13 namespace MongoDB.Test 14 { 15     public class MongodbHelper<T> where T : class 16     { 17         string connectionString = string.Empty; 18  19         string databaseName = string.Empty; 20  21         string collectionName = string.Empty; 22  23         static MongodbHelper<T> mongodb; 24  25         #region 初始化操作 26         /// <summary> 27 /// 初始化操作 28 /// </summary> 29         public MongodbHelper() 30         { 31             connectionString = "Server=127.0.0.1:2222"; 32             databaseName = "shopex"; 33             collectionName = "person"; 34         } 35         #endregion 36  37         #region 實現linq查詢的映射配置 38         /// <summary> 39 /// 實現linq查詢的映射配置 40 /// </summary> 41         public MongoConfiguration configuration 42         { 43             get 44             { 45                 var config = new MongoConfigurationBuilder(); 46  47                 config.Mapping(mapping => 48                 { 49                     mapping.DefaultProfile(profile => 50                     { 51                         profile.SubClassesAre(t => t.IsSubclassOf(typeof(T))); 52                     }); 53                     mapping.Map<T>(); 54                     mapping.Map<T>(); 55                 }); 56  57                 config.ConnectionString(connectionString); 58  59                 return config.BuildConfiguration(); 60             } 61         } 62         #endregion 63  64         #region 插入操作 65         /// <summary> 66 /// 插入操作 67 /// </summary> 68 /// <param name="person"></param> 69 /// <returns></returns> 70         public void Insert(T t) 71         { 72             using (Mongo mongo = new Mongo(configuration)) 73             { 74                 try 75                 { 76                     mongo.Connect(); 77  78                     var db = mongo.GetDatabase(databaseName); 79  80                     var collection = db.GetCollection<T>(collectionName); 81  82                     collection.Insert(t, true); 83  84                     mongo.Disconnect(); 85  86                 } 87                 catch (Exception) 88                 { 89                     mongo.Disconnect(); 90                     throw; 91                 } 92             } 93         } 94         #endregion 95  96         #region 更新操作 97         /// <summary> 98 /// 更新操作 99 /// </summary>100 /// <param name="person"></param>101 /// <returns></returns>102         public void Update(T t, Expression<Func<T, bool>> func)103         {104             using (Mongo mongo = new Mongo(configuration))105             {106                 try107                 {108                     mongo.Connect();109 110                     var db = mongo.GetDatabase(databaseName);111 112                     var collection = db.GetCollection<T>(collectionName);113 114                     collection.Update<T>(t, func, true);115 116                     mongo.Disconnect();117 118                 }119                 catch (Exception)120                 {121                     mongo.Disconnect();122                     throw;123                 }124             }125         }126         #endregion127 128         #region 獲取集合129         /// <summary>130 ///獲取集合131 /// </summary>132 /// <param name="person"></param>133 /// <returns></returns>134         public List<T> List(int pageIndex, int pageSize, Expression<Func<T, bool>> func, out int pageCount)135         {136             pageCount = 0;137 138             using (Mongo mongo = new Mongo(configuration))139             {140                 try141                 {142                     mongo.Connect();143 144                     var db = mongo.GetDatabase(databaseName);145 146                     var collection = db.GetCollection<T>(collectionName);147 148                     pageCount = Convert.ToInt32(collection.Count());149 150                     var personList = collection.Linq().Where(func).Skip(pageSize * (pageIndex - 1))151                                                    .Take(pageSize).Select(i => i).ToList();152 153                     mongo.Disconnect();154 155                     return personList;156 157                 }158                 catch (Exception)159                 {160                     mongo.Disconnect();161                     throw;162                 }163             }164         }165         #endregion166 167         #region 讀取單條記錄168         /// <summary>169 ///讀取單條記錄170 /// </summary>171 /// <param name="person"></param>172 /// <returns></returns>173         public T Single(Expression<Func<T, bool>> func)174         {175             using (Mongo mongo = new Mongo(configuration))176             {177                 try178                 {179                     mongo.Connect();180 181                     var db = mongo.GetDatabase(databaseName);182 183                     var collection = db.GetCollection<T>(collectionName);184 185                     var single = collection.Linq().FirstOrDefault(func);186 187                     mongo.Disconnect();188 189                     return single;190 191                 }192                 catch (Exception)193                 {194                     mongo.Disconnect();195                     throw;196                 }197             }198         }199         #endregion200 201         #region 刪除操作202         /// <summary>203 /// 刪除操作204 /// </summary>205 /// <param name="person"></param>206 /// <returns></returns>207         public void Delete(Expression<Func<T, bool>> func)208         {209             using (Mongo mongo = new Mongo(configuration))210             {211                 try212                 {213                     mongo.Connect();214 215                     var db = mongo.GetDatabase(databaseName);216 217                     var collection = db.GetCollection<T>(collectionName);218 219                     //這個地方要注意，一定要加上T參數，否則會當作object類型處理220 //導致刪除失敗221                     collection.Remove<T>(func);222 223                     mongo.Disconnect();224 225                 }226                 catch (Exception)227                 {228                     mongo.Disconnect();229                     throw;230                 }231             }232         }233         #endregion234     }235 236     #region 數據實體237     /// <summary>238 /// 數據實體239 /// </summary>240     public class Person241     {242         [MongoAlias("_id")]243         public string ID { get; set; }244 245         public string Name { get; set; }246 247         public int Age { get; set; }248 249         public DateTime CreateTime { get; set; }250     }251     #endregion252 }			