package com.jaeson.mongodb;
import java.util.ArrayList;
import java.util.List;
import org.bson.Document;
import com.mongodb.Block;
import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
//import com.mongodb.MongoClientURI;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.Sorts;
import com.mongodb.client.model.Projections;
public class MongodbTest {
@SuppressWarnings("unused")
public static void connectServer() {
try {
// connect to mongodb service
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
//MongoClientURI connectionString = new MongoClientURI("mongodb://localhost:27017");
//MongoClient mongoClient = new MongoClient(connectionString);
//MongoClient mongoClient = new MongoClient(
// Arrays.asList(new ServerAddress("localhost", 27017),
// new ServerAddress("localhost", 27018)));
//Get A List of Databases
for (String name: mongoClient.listDatabaseNames()) {
System.out.println(name);
}
//drop database
//mongoClient.getDatabase("databaseToBeDropped").drop();
// connect to the database
MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb");
System.out.println("Connect to database successfully");
mongoClient.close();
} catch(Exception e) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
@SuppressWarnings("unused")
public static void connectServer(String username, String password) {
try {
//Connect to the MongoDB service, if it is a remote connection, you can replace "localhost" with the IP address of the server
//ServerAddress() The two parameters are the server address and port respectively
ServerAddress serverAddress = new ServerAddress("localhost", 27017);
List<ServerAddress> addrs = new ArrayList<ServerAddress>();
addrs.add(serverAddress);
//MongoCredential.createScramSha1Credential() The three parameters are username database name password
MongoCredential credential = MongoCredential.createScramSha1Credential(username, "databaseName", password.toCharArray());
List<MongoCredential> credentials = new ArrayList<MongoCredential>();
credentials.add(credential);
//Get MongoDB connection through connection authentication
MongoClient mongoClient = new MongoClient(addrs, credentials);
//connect to database
MongoDatabase mongoDatabase = mongoClient.getDatabase("databaseName");
System.out.println("Connect to database successfully");
mongoClient.close();
} catch (Exception e) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
public static void createCollection() {
try{
// connect to mongodb service
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
// connect to the database
MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb");
System.out.println("Connect to database successfully");
mongoDatabase.createCollection("mycol");
System.out.println("Collection created successfully");
//Get A List of Collections
for (String name : mongoDatabase.listCollectionNames()) {
System.out.println(name);
}
MongoCollection<Document> collection = mongoDatabase.getCollection("mycol");
System.out.println("Collection mycol selected successfully");
// create an ascending index on the "i" field, 1 = ascending, -1 = descending
collection.createIndex(new Document("i", 1));
//Get a List of Indexes on a Collection
for (final Document index : collection.listIndexes()) {
System.out.println(index.toJson());
}
//drop collection
//collection.dropCollection();
mongoClient.close();
} catch(Exception e) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
public static void insert() {
try{
// connect to mongodb service
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
// connect to the database
MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb");
System.out.println("Connect to database successfully");
MongoCollection<Document> collection = mongoDatabase.getCollection("mycol");
System.out.println("Collection mycol selected successfully");
//insert document
/**
* 1. Create document org.bson.Document parameter is key-value format
* 2. Create a document collection List<Document>
* 3. Insert the document collection into the database collection mongoCollection.insertMany(List<Document>) Inserting a single document can use mongoCollection.insertOne(Document)
*/
Document document = new Document("title", "MongoDB").
append("description", "database").
append("likes", 100).
append("by", "Fly");
List<Document> documents = new ArrayList<Document>();
documents.add(document);
collection.insertMany(documents);
//collection.insertOne(document);
System.out.println("Document inserted successfully");
mongoClient.close();
} catch(Exception e) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
public static void find() {
try{
// connect to mongodb service
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
// connect to the database
MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb");
System.out.println("Connect to database successfully");
MongoCollection<Document> collection = mongoDatabase.getCollection("mycol");
System.out.println("Collection mycol selected successfully, count=" + collection.count());
// retrieve all documents
/**
* 1. Get the iterator FindIterable<Document>
* 2. Get the cursor MongoCursor<Document>
* 3. Traverse the retrieved document collection through the cursor
*/
FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while (mongoCursor.hasNext()) {
System.out.println(mongoCursor.next());
}
List<Document> foundDocument = collection.find().into(new ArrayList<Document>());
for (Document document : foundDocument) {
System.out.println(document.toJson());
}
//find first
Document myDoc = collection.find(Filters.eq("likes", 100)).first();
System.out.println(myDoc.toJson());
//find 50 < likes <= 200
Block<Document> printBlock = new Block<Document>() {
@Override
public void apply(final Document document) {
System.out.println(document.toJson());
}
};
collection.find(Filters.and(Filters.gt("likes", 50), Filters.lte("likes", 200))).forEach(printBlock);
//sort by likes desc
myDoc = collection.find(Filters.exists("likes")).sort(Sorts.descending("likes")).first();
System.out.println(myDoc.toJson());
//exclude the _id field
myDoc = collection.find().projection(Projections.excludeId()).first();
System.out.println(myDoc.toJson());
mongoClient.close();
} catch(Exception e) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
public static void update() {
try{
// connect to mongodb service
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
// connect to the database
MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb");
System.out.println("Connect to database successfully");
MongoCollection<Document> collection = mongoDatabase.getCollection("mycol");
System.out.println("Collection mycol selected successfully");
//Update the document Change the document with likes=100 in the document to likes=200
//collection.updateOne(Filters.eq("likes", 100), new Document("$set",new Document("likes",200)));
collection.updateMany(Filters.eq("likes", 100), new Document("$set",new Document("likes",200)));
//Update the document to increase the likes of documents with likes=100 in the document by 50
collection.updateMany(Filters.eq("likes", 100), new Document("$inc", new Document("likes", 50)));
//Retrieve view result
FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while (mongoCursor.hasNext()) {
System.out.println(mongoCursor.next());
}
mongoClient.close();
} catch(Exception e) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
public static void delete() {
try{
// connect to mongodb service
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
// connect to the database
MongoDatabase mongoDatabase = mongoClient.getDatabase("mydb");
System.out.println("Connect to database successfully");
MongoCollection<Document> collection = mongoDatabase.getCollection("mycol");
System.out.println("Collection mycol selected successfully");
// delete the first document that matches the condition
//collection.deleteOne(Filters.eq("likes", 200));
// delete all eligible documents
collection.deleteMany (Filters.eq("likes", 200));
//Retrieve view result
FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while (mongoCursor.hasNext()) {
System.out.println(mongoCursor.next());
}
mongoClient.close();
} catch(Exception e) {
System.err.println( e.getClass().getName() + ": " + e.getMessage() );
}
}
public static void main(String[] args) {
}
}