com.DA.assignment1.Query.Demonstrate.java Source code

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Here is the source code for com.DA.assignment1.Query.Demonstrate.java

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package com.DA.assignment1.Query;

import com.mongodb.Block;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.FindIterable;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.bson.Document;

public class Demonstrate {
    public void Answer() throws Exception {
        MongoClient mongoClient = new MongoClient();
        MongoDatabase db = mongoClient.getDatabase("test");
        MongoCollection<Document> tag = db.getCollection("tags");
        MongoCollection<Document> movie = db.getCollection("movies");
        MongoCollection<Document> rating = db.getCollection("ratings");

        sum(movie);

        //selectMovie(rating);

        Tag(tag);

    }

    public static void sum(MongoCollection<Document> movie) {
        long sum = movie.count();
        System.out.println("the total movies are: " + sum);
    }

    public static void selectMovie(MongoCollection<Document> rating) throws IOException {
        System.out.println("Please enter userID: you can check the rating records ");
        BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
        String userID = br1.readLine();

        FindIterable<Document> movies = rating.find(new Document("userID", userID));

        movies.forEach(new Block<Document>() {
            @Override
            public void apply(final Document document) {
                System.out.println(document);
            }
        });

    }

    public static void Tag(MongoCollection<Document> tag) throws IOException {
        System.out.println("Please enter movieID:");

        BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
        String movieID = br1.readLine();

        FindIterable<Document> tags = tag.find(new Document("movieID", movieID));
        tags.forEach(new Block<Document>() {
            @Override
            public void apply(final Document document) {
                System.out.println(document);
            }
        });
    }

}