使用Mongodb 做对象缓存

mongodb高效的访问速度，用来快速存取数据再合适不过了，缓存神马的，可以用这个的

另外，有的时候，如果仅仅存储几条数据，单独去建立一张表代价太大，这个时候，不妨试试这个

 

先发一个mongodb数据访问帮助类

public class MongdbHelper : IDisposable
    {
        public MongoServer Server { get; private set; }

        public MongoDB.Driver.MongoDatabase Database { get; private set; }

        public MongoCollection
   
   
   
     DataSet { get; set; } public MongdbHelper( string dbName, string tableName) { Server = MongoServer.Create("mongodb://localhost/?socketTimeoutMS=2400000"); Database = Server.GetDatabase(dbName); DataSet = Database.GetCollection(tableName); } public MongdbHelper(string connectionString, string dbName, string tableName) { Server = MongoServer.Create(connectionString); Database = Server.GetDatabase(dbName); DataSet = Database.GetCollection(tableName); } public void Dispose() { Server.Disconnect(); } public static List 
    
      GetOnColumn 
     
       (string dbName, string tableName, string column, Func 
      
        convert) { try { using (MongdbHelper db = new MongdbHelper(dbName, tableName)) { List 
       
         results = new List 
        
          (); var r = db.DataSet.FindAll(); r.SetFields(column); foreach (var c in r) { results.Add(convert(c[column])); } return results; } } catch { return null; } } public static bool IsExist(string dbName, string tableName, string column, object value) { try { using (MongdbHelper db = new MongdbHelper(dbName, tableName)) { IMongoQuery query = new QueryDocument() { { column, value.ToString() } }; var results = db.DataSet.FindOne(query); return results != null; } } catch { return false; } } } 
         
        
       
      
     
   

 

再来看具体的实现：

原理：将对象通过序列化操作后以二进制的方式存储到mongodb中

存实现：

/// 

        /// 存储数据
        /// 
        /// 
  
  
  
        /// 
        /// 
        public static void Set
  
  
  
   
   
   (string key, T value)
        {
            try
            {
                using (MongdbHelper db = new MongdbHelper(DefaultDbName, DefaultTableName))
                {
                    IMongoQuery query = new QueryDocument()
                {
                    {"Key",key}
                };
                    var document = db.DataSet.FindOne(query);
                    if (document != null)
                    {
                        document["Value"] = SerializeHelper.BinarySerialize(value);
                        document["Type"] = value.GetType().Name;
                        document["Date"] = DateTime.Now.ToString();
                    }
                    else
                    {
                        IDictionary
   
   
   
     newDict = new Dictionary 
    
      (); newDict.Add("Value", SerializeHelper.BinarySerialize(value)); newDict.Add("Key", key); newDict.Add("Type", value.GetType().Name); newDict.Add("Date", DateTime.Now.ToString()); document = new BsonDocument(newDict); } db.DataSet.Save(document); } } catch (Exception ex) { throw new Exception("保存数据出错", ex); } } 
     
   
  
  
  

取实现：

/// 

        /// 获取对象
        /// 
        /// 
  
  
  
        /// 
        /// 
  
  
  
        public static T Get
  
  
  
   
   
   (string key)
        {
            using (MongdbHelper db = new MongdbHelper(DefaultDbName, DefaultTableName))
            {

                IDictionary
   
   
   
     dict = new Dictionary 
    
      (); dict.Add("Key", key); IMongoQuery query = new QueryDocument() { {"Key",key} }; // 查询 var document = db.DataSet.FindOne(query); if (document != null) { try { byte[] bytes = ((MongoDB.Bson.BsonBinaryData)document["Value"]).Bytes; #region 反序列化字节数组 if (string.Equals(document["Type"].ToString(), typeof(T).Name, StringComparison.InvariantCultureIgnoreCase)) { return SerializeHelper.BinaryDeSerialize 
     
       (bytes); } else { return default(T); } #endregion } catch { return default(T); } } return default(T); } } 
      
     
   
  
  
  

另外，为了方便存储单个对象的数据，例如配置信息，增加下面两个方法：

/// 

        /// 存储对象 
        /// 适用于只有单个对象或单条记录的数据,例如系统配置
        /// 
        /// 
  
  
  
        /// 
        public static void Set
  
  
  
   
   
   (T value)
        {
            Set(typeof(T).Name, value);
        }

        /// 
   
   
   
 /// 获取对象 /// 适用于只有单个对象或单条记录的数据,例如系统配置 /// 
        /// 
   
   
   
        /// 
   
   
   
        public static T Ge
   
   
   
     () { return Get 
    
      (typeof(T).Name); } 
     
   
  
  
  

 

完整代码：

public class SerializeHelper
    {
        /// 

        /// 反序列化
        /// 
        /// 
  
  
  
        /// 
        /// 
  
  
  
        public static T BinaryDeSerialize
  
  
  
   
   
   (byte[] serializedObject)
        {
            MemoryStream serializationStream = new MemoryStream();
            serializationStream.Write(serializedObject, 0, serializedObject.Length);
            serializationStream.Seek(0L, SeekOrigin.Begin);
            object obj2 = new BinaryFormatter().Deserialize(serializationStream);
            serializationStream.Close();
            serializationStream.Dispose();
            return (T)obj2;
        }

        /// 
   
   
   
 /// 序列化 /// 
        /// 
   
   
   
        /// 
   
   
   
        public static byte[] BinarySerialize(object obj)
        {
            MemoryStream serializationStream = new MemoryStream();
            new BinaryFormatter().Serialize(serializationStream, obj);
            serializationStream.Seek(0L, SeekOrigin.Begin);
            byte[] buffer = serializationStream.ToArray();
            serializationStream.Close();
            serializationStream.Dispose();
            return buffer;
        }
    }

    /// 
   
   
   
 /// 简易的mongodb数据存储服务 /// 
    public class DataService
    {
        /// 
   
   
   
 /// 数据接名 /// 
        static string DefaultDbName = "MongodbService";

        static string DefaultTableName = "DataSet";

 
        /// 
   
   
   
 /// 获取对象 /// 
        /// 
   
   
   
        /// 
   
   
   
        /// 
   
   
   
        public static T Get
   
   
   
     (string key) { using (MongdbHelper db = new MongdbHelper(DefaultDbName, DefaultTableName)) { IDictionary 
    
      dict = new Dictionary 
     
       (); dict.Add("Key", key); IMongoQuery query = new QueryDocument() { {"Key",key} }; // 查询 var document = db.DataSet.FindOne(query); if (document != null) { try { byte[] bytes = ((MongoDB.Bson.BsonBinaryData)document["Value"]).Bytes; #region 反序列化字节数组 if (string.Equals(document["Type"].ToString(), typeof(T).Name, StringComparison.InvariantCultureIgnoreCase)) { return SerializeHelper.BinaryDeSerialize 
      
        (bytes); } else { return default(T); } #endregion } catch { return default(T); } } return default(T); } } /// 
       
 /// 存储数据 /// 
 /// 
        /// 
        /// 
        public static void Set 
       
         (string key, T value) { try { using (MongdbHelper db = new MongdbHelper(DefaultDbName, DefaultTableName)) { IMongoQuery query = new QueryDocument() { {"Key",key} }; var document = db.DataSet.FindOne(query); if (document != null) { document["Value"] = SerializeHelper.BinarySerialize(value); document["Type"] = value.GetType().Name; document["Date"] = DateTime.Now.ToString(); } else { IDictionary 
        
          newDict = new Dictionary 
         
           (); newDict.Add("Value", SerializeHelper.BinarySerialize(value)); newDict.Add("Key", key); newDict.Add("Type", value.GetType().Name); newDict.Add("Date", DateTime.Now.ToString()); document = new BsonDocument(newDict); } db.DataSet.Save(document); } } catch (Exception ex) { throw new Exception("保存数据出错", ex); } } /// 
          
 /// 存储对象 /// 适用于只有单个对象或单条记录的数据,例如系统配置 /// 
 /// 
           /// 
           public static void Set 
          
            (T value) { Set(typeof(T).Name, value); } /// 
           
 /// 获取对象 /// 适用于只有单个对象或单条记录的数据,例如系统配置 /// 
 /// 
            /// 
            public static T Ge 
           
             () { return Get 
            
              (typeof(T).Name); } } 
             
            
           
          
         
        
       
      
     
   
  
  
  

 

使用举例：

有这个一个用户类：

/// 

    /// 简易的用户模型
    /// 
    [Serializable]
    public class UserModel
    {
        public int UserId
        {
            get;
            set;
        }

        public string UserName
        {
            get;
            set;
        }

        public string Name
        {
            get;
            set;
        }
    }

可以用这样的方式来进行存取：

public UserModel CurrentUser
        {
            get
            {
                if (currentUser == null)
                {
                    if (!string.IsNullOrEmpty(CurrentUserName))
                    {
                        currentUser = DataService.Get
  
  
  
   
   
   (this.CurrentUserName);

                        if (currentUser == null)
                        {
                            var user = IoC.Resolve
   
   
   
     ().FindByAccountName(CurrentUserName); if (user != null) { currentUser = new UserModel { UserName = CurrentUserName, Name = user.Name, UserId = user.ID }; // 保存到mongodb 长久存储 DataService.Set 
    
      (this.CurrentUserName, currentUser); } } } } return currentUser; } }