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。
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 }
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
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 实现linq查询的映射配置
38 /// <summary>
39 /// 实现linq查询的映射配置
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 try
107 {
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 #endregion
127
128 #region 获取集合
129 /// <summary>
130 ///获取集合
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 try
141 {
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 #endregion
166
167 #region 读取单条记录
168 /// <summary>
169 ///读取单条记录
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 try
178 {
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 #endregion
200
201 #region 删除操作
202 /// <summary>
203 /// 删除操作
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 try
212 {
213 mongo.Connect();
214
215 var db = mongo.GetDatabase(databaseName);
216
217 var collection = db.GetCollection<T>(collectionName);
218
219 //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
220 //导致删除失败
221 collection.Remove<T>(func);
222
223 mongo.Disconnect();
224
225 }
226 catch (Exception)
227 {
228 mongo.Disconnect();
229 throw;
230 }
231 }
232 }
233 #endregion
234 }
235
236 #region 数据实体
237 /// <summary>
238 /// 数据实体
239 /// </summary>
240 public class Person
241 {
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 #endregion
252 }
