12. MongoDB : GridFS - to store (static data, audio, video large files)

12. MongoDB : GridFS - to store (static data, audio, video large files)

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//save file on db
GridFSInputFile gfsFile = gfsPhoto.createFile(imageFile);
gfsFile.save();

//get all grid files
DBCursor cursor = gfsPhoto.getFileList();

//get particular grid file
GridFSDBFile imageForOutput = gfsPhoto.findOne(newFileName);

//remove grid file from db
gfsPhoto.remove(gfsPhoto.findOne(newFileName));

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bez we know 16MB is the max in document.
GridFS -> how it stores more than 16MB, internally it split in to chunks and stores

###############################JAVA PROGRAM TO STORE/READ/DELETE GRIDFILE FROM DB###############################################

-- Download JDK 1.8 (Version that you prefer) for Windows/Linux
-- Install Eclipse oxygen
-- Create a project in eclipse
-- Create a simple Java Class in eclipse
-- Use the code below to upload an image file
-- Get these dependencies and add it to the java classes build path

mongodb-driver-core-3.4.2.jar
mongodb-driver-3.4.2.jar
bson-3.4.2.jar

https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver/3.4.2   -> mongodb-driver-core-3.4.2.jar
https://mvnrepository.com/artifact/org.mongodb/mongodb-driver/3.4.2   -> mongodb-driver-3.4.2.jar
https://mvnrepository.com/artifact/org.mongodb/bson/3.4.2    -> bson-3.4.2.jar

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package com.mongodb.gridfs;

import java.io.File;

import java.io.IOException;

import com.mongodb.DB;

import com.mongodb.DBCursor;

import com.mongodb.MongoClient;

import com.mongodb.gridfs.GridFS;

import com.mongodb.gridfs.GridFSDBFile;

import com.mongodb.gridfs.GridFSInputFile;

public class UploadFile {

    public static void main(String[] args) throws IOException {

        MongoClient mongoClient = new MongoClient("localhost", 27017);

        DB db = mongoClient.getDB("sample");

        String newFileName = "gridFS-java-image";

        File imageFile = new File("C:\\Users\\Pictures\\MyFile.png");

        // create a "photo" namespace

        GridFS gfsPhoto = new GridFS(db, "photo");

        // get image from local drive

        GridFSInputFile gfsFile = gfsPhoto.createFile(imageFile);

        // set the new file name for identity

        gfsFile.setFilename(newFileName);

        // save the image file to mongoDB

        gfsFile.save();

        // print the result

        DBCursor cursor = gfsPhoto.getFileList();

while (cursor.hasNext()){

            System.out.println(cursor.next());

        }

        // get the image file by it's filename

        GridFSDBFile imageForOutput = gfsPhoto.findOne(newFileName);

        // save it to a new image file

        imageForOutput.writeTo("C:\\Users\\Pictures\\MyFileFromMongDB.png");

        System.out.println("Done");

        // Remove the file.

        gfsPhoto.remove(gfsPhoto.findOne(newFileName));

        // close the connection

        mongoClient.close();

    }

}

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