public MongoClient mongoClient() { if (mongoClient == null) { mongoClient = MongoClients.create(); } return mongoClient; }
/** * Run this main method to see the output of this quick example. * * @param args takes an optional single argument for the connection string * @throws InterruptedException if a latch is interrupted */ public static void main(final String[] args) throws InterruptedException { MongoClient mongoClient; if (args.length == 0) { // connect to the local database server mongoClient = MongoClients.create(); } else { mongoClient = MongoClients.create(args[0]); } // get handle to "mydb" database MongoDatabase database = mongoClient.getDatabase("mydb"); // get a handle to the "test" collection final MongoCollection<Document> collection = database.getCollection("test"); // drop all the data in it final CountDownLatch dropLatch = new CountDownLatch(1); collection.drop( new SingleResultCallback<Void>() { @Override public void onResult(final Void result, final Throwable t) { dropLatch.countDown(); } }); dropLatch.await(); // make a document and insert it Document doc = new Document("name", "MongoDB") .append("type", "database") .append("count", 1) .append("info", new Document("x", 203).append("y", 102)); collection.insertOne( doc, new SingleResultCallback<Void>() { @Override public void onResult(final Void result, final Throwable t) { System.out.println("Inserted!"); } }); // get it (since it's the only one in there since we dropped the rest earlier on) collection .find() .first( new SingleResultCallback<Document>() { @Override public void onResult(final Document document, final Throwable t) { System.out.println(document.toJson()); } }); // now, lets add lots of little documents to the collection so we can explore queries and // cursors List<Document> documents = new ArrayList<Document>(); for (int i = 0; i < 100; i++) { documents.add(new Document("i", i)); } collection.insertMany( documents, new SingleResultCallback<Void>() { @Override public void onResult(final Void result, final Throwable t) { collection.count( new SingleResultCallback<Long>() { @Override public void onResult(final Long count, final Throwable t) { System.out.println( "total # of documents after inserting 100 small ones (should be 101) " + count); } }); } }); // find first SingleResultCallback<Document> printDocument = new SingleResultCallback<Document>() { @Override public void onResult(final Document document, final Throwable t) { System.out.println(document.toJson()); } }; collection.find().first(printDocument); // lets get all the documents in the collection and print them out Block<Document> printDocumentBlock = new Block<Document>() { @Override public void apply(final Document document) { System.out.println(document.toJson()); } }; SingleResultCallback<Void> callbackWhenFinished = new SingleResultCallback<Void>() { @Override public void onResult(final Void result, final Throwable t) { System.out.println("Operation Finished!"); } }; collection.find().forEach(printDocumentBlock, callbackWhenFinished); // Query Filters // now use a query to get 1 document out collection.find(eq("i", 71)).first(printDocument); // now use a range query to get a larger subset collection.find(gt("i", 50)).forEach(printDocumentBlock, callbackWhenFinished); // range query with multiple constraints collection .find(and(gt("i", 50), lte("i", 100))) .forEach(printDocumentBlock, callbackWhenFinished); // Sorting collection.find(exists("i")).sort(descending("i")).first(printDocument); // Projection collection.find().projection(excludeId()).first(printDocument); // Update One collection.updateOne( eq("i", 10), set("i", 110), new SingleResultCallback<UpdateResult>() { @Override public void onResult(final UpdateResult result, final Throwable t) { System.out.println(result.getModifiedCount()); } }); // Update Many collection.updateMany( lt("i", 100), inc("i", 100), new SingleResultCallback<UpdateResult>() { @Override public void onResult(final UpdateResult result, final Throwable t) { System.out.println(result.getModifiedCount()); } }); // Delete One collection.deleteOne( eq("i", 110), new SingleResultCallback<DeleteResult>() { @Override public void onResult(final DeleteResult result, final Throwable t) { System.out.println(result.getDeletedCount()); } }); // Delete Many collection.deleteMany( gte("i", 100), new SingleResultCallback<DeleteResult>() { @Override public void onResult(final DeleteResult result, final Throwable t) { System.out.println(result.getDeletedCount()); } }); final CountDownLatch dropLatch2 = new CountDownLatch(1); collection.drop( new SingleResultCallback<Void>() { @Override public void onResult(final Void result, final Throwable t) { dropLatch2.countDown(); } }); dropLatch2.await(); // ordered bulk writes List<WriteModel<Document>> writes = new ArrayList<WriteModel<Document>>(); writes.add(new InsertOneModel<Document>(new Document("_id", 4))); writes.add(new InsertOneModel<Document>(new Document("_id", 5))); writes.add(new InsertOneModel<Document>(new Document("_id", 6))); writes.add( new UpdateOneModel<Document>( new Document("_id", 1), new Document("$set", new Document("x", 2)))); writes.add(new DeleteOneModel<Document>(new Document("_id", 2))); writes.add( new ReplaceOneModel<Document>( new Document("_id", 3), new Document("_id", 3).append("x", 4))); SingleResultCallback<BulkWriteResult> printBatchResult = new SingleResultCallback<BulkWriteResult>() { @Override public void onResult(final BulkWriteResult result, final Throwable t) { System.out.println(result); } }; collection.bulkWrite(writes, printBatchResult); final CountDownLatch dropLatch3 = new CountDownLatch(1); collection.drop( new SingleResultCallback<Void>() { @Override public void onResult(final Void result, final Throwable t) { dropLatch3.countDown(); } }); dropLatch2.await(); collection.bulkWrite(writes, new BulkWriteOptions().ordered(false), printBatchResult); collection.find().forEach(printDocumentBlock, callbackWhenFinished); // Clean up final CountDownLatch dropLatch4 = new CountDownLatch(1); collection.drop( new SingleResultCallback<Void>() { @Override public void onResult(final Void result, final Throwable t) { dropLatch4.countDown(); } }); dropLatch4.await(); // release resources mongoClient.close(); }