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8天学通MongoDB——第八天 驱动实践

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 #endregion
103
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 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 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 try
149 {
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。

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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.Now
14 });
15 }
16
17 Console.WriteLine("插入成功");
18
19 Console.Read();
20 }

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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 }

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<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 }

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<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 }

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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。技术分享

8天学通MongoDB——第八天 驱动实践