MongoDB 学习笔记（四）C# 操作MongoDB

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。

封装的 MongoDBHepler

 public class MongoDBHepler<T> where T:class
    {
//数据库连接字符串区分大小写
        public static string connectionString =ConfigurationManager.AppSettings["mongodbconn"].ToString();
        public static string databaseName = ConfigurationManager.AppSettings["mongodbName"].ToString();

        #region 初始化操作
        /// <summary>
        ///
        /// </summary>
        /// <param name="strdatabaseName"></param>
        /// <param name="strcollectionName"></param>
        public MongoDBHepler()
        {
        }
        #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>
        /// <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>();
                    collection.Insert(t, true);
                    mongo.Disconnect();
                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        public void Insert(List<T> list)
        {
            using (Mongo mongo = new Mongo(configuration))
            {
                try
                {
                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);
                    var collection = db.GetCollection<T>();
                    collection.Insert(list, true);
                    mongo.Disconnect();
                }
                catch (Exception)
                {
                    mongo.Disconnect();
                    throw;
                }
            }
        }
        #endregion

        #region 更新操作
        /// <summary>
        /// 更新操作
        /// </summary>
        /// <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>();
                    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>

        /// <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>();
                    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;
                }
            }
        }
        public List<T> List(Expression<Func<T, bool>> func)
        {
            using (Mongo mongo = new Mongo(configuration))
            {
                try
                {
                    mongo.Connect();
                    var db = mongo.GetDatabase(databaseName);
                    var collection = db.GetCollection<T>();
                    var personList = collection.Linq().Where(func).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>
        /// <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>();
                    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>

        /// <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>();
                    //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

    }

使用：

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

<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         }