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8天学习MongoDB——第八天 驱动实践

 
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 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。

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 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
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2:初始化一些变量

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 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
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3:为了方便T的继承类使用linq功能,我们还需要映射一下。

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 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
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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。

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  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
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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:

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 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”

复制代码
 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

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 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

复制代码
 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         }
复制代码

 

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
}

 

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