MongoDB file (MongoDB FS)

1. Whether it is storing normal data or storing files, we must first visit the MongoDB database

 Public Static mongodatabase getdatabase ()        {            //MongoDB server address         var New mongoclient (Config.BasicConfig.DbAddress);             var server = client. Getserver ();             // MongoDb database name         return server. Getdatabase (Config.BasicConfig.DbName);        }

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2: Get FS

MongoDB get an instance of FS I know there are two ways to do this.

• 1: Directly through the Database property call, if we understand MongoDB as SQL Server database, then this way is to get to the default table "FS" instance.
• 2: By setting the root property value by Mongogridfssettings, MongoDB will generate a specific table based on the root value, without having to create

Don't talk nonsense, look at the code

// accesses a collection or table of files named Test, and if not, automatically creates Dbhelper.getdatabase (). Getgridfs (new"Test"}); // Gets the default collection or table "FS" Dbhelper.getdatabase (). Gridfs;

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3: Implement File Upload
File Upload, MongoDB provides a mongogridfscreateoptions class to improve our file information, I generally only use the inside of the ContentType

// Huo de Wen Jian ji he var fs = Dbhelper.getdatabase (). Getgridfs (new mongogridfssettings {Root = fileType}); // Chuang Jian Wen Jian shu xing, zhi jie shang chuan de wen Jian mei u ContentType Shu Xing, Xu Yao Shou dong zhi di ngvarnew MongoDB.Driver.GridFS.MongoGridFSCreateOptions {ContentType = ContentType}; // Wen Jian Shang Chuan var fileInfo = fs. Upload (stream, filename, op);

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4: File acquisition
When I use MongoDB FS, I use the program to control the file name unique, get the code

//Get File PublicFileitem GetFile (stringFileno,stringFileType) {            //assembly file name            varfilename =string. Format ("{0}_{1}", FileType, Fileno); varFS = Dbhelper.getdatabase (). Getgridfs (Newmongogridfssettings {Root=FileType}); //find a file based on the file name            varFileInfo =FS.            FindOne (filename); if(FileInfo! =NULL&&fileinfo.exists) {using(varFileStream =Fileinfo.open (FileMode.Open, FileAccess.Read)) {                    varbytes =New byte[Filestream.length]; //read file as bytesFileStream.Read (Bytes,0, Bytes.                    Length); return NewFileitem {ContentType= fileinfo.contenttype, filecontent = bytes, Filename = fileinfo.name, MD5 = fileinfo.md5, Size = Fileinfo.length +"", Uploaddate=Fileinfo.uploaddate}; }            }            return NULL; }

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5: File Modification
File modification I'm not talking nonsense, just look at the code.

//modify File (overwrite) PublicFileitem Upload (stringFileno,stringFileType, Stream stream) {            varfilename =string. Format ("{0}_{1}", FileType, Fileno); varFS = Dbhelper.getdatabase (). Getgridfs (Newmongogridfssettings {Root =FileType}); varOldfileinfo =FS.            FindOne (filename); if(Oldfileinfo! =NULL&&oldfileinfo.exists) {varbytes =New byte[Stream.                Length]; Stream. Read (Bytes,0, Bytes.                Length); using(varSW =Oldfileinfo.openwrite ()) {SW. Seek (0, Seekorigin.begin); Sw. Write (Bytes,0, Bytes.                    Length); Sw.                    Flush ();                Oldfileinfo.refresh (); }              }            return NewFileitem {ContentType = oldfileinfo.contenttype, filecontent =NULL, Filename = oldfileinfo.name, MD5 = oldfileinfo.md5, Size = Oldfileinfo.length +"", uploaddate =Oldfileinfo.uploaddate}; }

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MongoDB file (MongoDB FS)