Using Mongodb for Object Caching

Mongodb's efficient access speed can be used to quickly access data.

In addition, it may be too costly to create a table separately if only a few pieces of data are stored.

 

Start with a mongodb data access help class

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; } } }
       
      
    
   
  

 

Let's take a look at the specific implementation:

Principle: objects are stored in mongodb in binary format after being serialized.

Storage implementation:

////// Store data //////
 //////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 ("failed to Save data", ex );}}
   
  
 

Implementation:

////// Get the object //////
 //////
 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 }}; // query var document = db. dataSet. findOne (query); if (document! = Null) {try {byte [] bytes = (MongoDB. bson. bsonBinaryData) document ["Value"]). bytes; # region deserialization byte array if (string. equals (document ["Type"]. toString (), typeof (T ). name, StringComparison. invariantCultureIgnoreCase) {return SerializeHelper. binaryDeSerialize
    
     
(Bytes) ;}else {return default (T) ;}# endregion} catch {return default (T );}}
    
   
  
 

In addition, to facilitate the storage of data of a single object, such as configuration information, add the following two methods:

////// Storage object // applicable to data with only one object or one record, such as system configuration //////
 ///Public static void Set
 
  
(T value) {Set (typeof (T). Name, value );}///
  /// Get object /// applicable to data with only one object or one record, for example, system configuration //////
  ///
  Public static T Ge
  
   
() {Return Get
   
    
(Typeof (T). Name );}
   
  
 

 

Complete code:

Public class SerializeHelper {////// Deserialization //////
 //////
 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 ;}///
  /// Serialization //////
  ///
  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 ;}}///
  /// Simple mongodb Data Storage Service ///Public class DataService {///
  /// Data connection name ///Static string DefaultDbName = "MongodbService"; static string DefaultTableName = "DataSet ";///
  /// Get the object //////
  ///
  ///
  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 }}; // query var document = db. dataSet. findOne (query); if (document! = Null) {try {byte [] bytes = (MongoDB. bson. bsonBinaryData) document ["Value"]). bytes; # region deserialization byte array 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 );}}///
      /// Store data //////
      ///
      ///
      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 ("failed to Save data", ex );}}///
         /// Storage object // applicable to data with only one object or one record, such as system configuration //////
         ///
         Public static void Set
         
           (T value) {Set (typeof (T). Name, value );}///
          /// Get object /// applicable to data with only one object or one record, for example, system configuration //////
          ///
          Public static T Ge
          
            () {Return Get
           
             (Typeof (T). Name );}}
           
          
         
        
       
      
     
    
   
  
 

 

Example:

There is a user class:

////// Simple user model ///[Serializable] public class UserModel {public int UserId {get; set;} public string UserName {get; set;} public string Name {get; set ;}}

You can use this method for access:

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}; // save it to the mongodb long-term storage DataService. Set
   
    
(This. CurrentUserName, currentUser) ;}}} return currentUser ;}}