mongodb.JavaDocDelete.java Source code

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Here is the source code for mongodb.JavaDocDelete.java

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/*
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//Deleting Documents from a Collection Using Java.

package mongodb;

/**
 *
 * @author soham
 */
import com.mongodb.MongoClient;
import com.mongodb.WriteConcern;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.BasicDBObject;
import com.mongodb.DBCursor;
import com.mongodb.WriteResult;

public class JavaDocDelete {
    public static void main(String[] args) {
        try {
            MongoClient mongoClient = new MongoClient("localhost", 27017);
            mongoClient.setWriteConcern(WriteConcern.MAJORITY);
            DB db = mongoClient.getDB("words");
            DBCollection collection = db.getCollection("word_stats");
            JavaDocDelete.showNewDocs(collection, "Before delete");
            JavaDocDelete.removeNewDocs(collection);
            JavaDocDelete.showNewDocs(collection, "After delete");
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    public static void removeNewDocs(DBCollection collection) {
        BasicDBObject query = new BasicDBObject("category", "New");
        WriteResult result = collection.remove(query);
        System.out.println("Delete Result: \n" + result.toString());
    }

    public static void showNewDocs(DBCollection collection, String msg) {
        System.out.println("\n" + msg + ": ");
        BasicDBObject query = new BasicDBObject("category", "New");
        DBCursor cursor = collection.find(query);
        while (cursor.hasNext()) {
            DBObject doc = cursor.next();
            System.out.println(doc);
        }
    }
}