8天學通MongoDB——第八天 驅動實踐

標籤：

作為系列的最後一篇，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後者，

因為提供了豐富的linq操作，相當方便。

 

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

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麼玩了。

 

一： 實踐

1：我們建立一個Person實體，MongoAlias特性表示取別名，這裡的ID值將會覆蓋掉資料庫自動產生的_id。

 1 #region 資料實體
 2     /// <summary>
 3 /// 資料實體
 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：初始化一些變數

 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 擷取集合
 66         /// <summary>
 67 ///擷取集合
 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         #endregion
103 
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                 try
115                 {
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         #endregion
137 
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                 try
149                 {
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連接埠，由於前前篇我已經把這個mongodb做成了服務，現在就直接連過去了，並做一下對Name的索引。

 

6. 一切準備妥當，我們做下基本的操作，比如這裡我添加一千條資料，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條資料
 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.Now
14                 });
15             }
16 
17             Console.WriteLine("插入成功");
18 
19             Console.Read();
20         }

乍一看顯示的資料以為有問題，為什麼沒有出現jack0或者jack999，不過find的一下後心情舒坦了。

<2> update:   這裡就把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：  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         }

<4> list操作： 這裡我擷取一下名字裡面帶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             //擷取名字裡面帶9的人數
 8             var list = helper.List(1, 20, i => i.Name.Contains("9"), out pagecount);
 9 
10            Console.Read();
11         }

 

總的運行代碼

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 實現linq查詢的映射配置        /// <summary>/// 實現linq查詢的映射配置/// </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 擷取集合        /// <summary>///擷取集合/// </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 讀取單條記錄        /// <summary>///讀取單條記錄/// </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 刪除操作        /// <summary>/// 刪除操作/// </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);                    //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//導致刪除失敗                    collection.Remove<T>(func);                    mongo.Disconnect();                }                catch (Exception)                {                    mongo.Disconnect();                    throw;                }            }        }        #endregion    }    #region 資料實體    /// <summary>/// 資料實體/// </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}

　　

趁著3天的休假，不斷的努力終於把這個系列寫完了，很感謝一直關注此系列的朋友。

8天學通MongoDB——第八天 驅動實踐