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All documents from students collection. > db.students.find().pretty(); { "_id" : ObjectId("58f29a694117d1b7af126dca"), "studentNo" : 1, "firstName" : "Prosen", "lastName" : "Ghosh", "age" ...

MongoDB's db.collection.drop() is used to drop a collection from the database. First, check the available collections into your database mydb. > use mydb switched to db mydb > show collections newCollection1 newCollection2 newCollection3 system.indexes Now drop the collection with...

Virtual Environment tool (virtualenv) is used to isolate different projects and their dependencies by creating individual python environments for each of them. It's like installing a package locally (and not globally), similar to npm package installation option. Following is an example to install ...

Ajax calls, request and retrieve data for giving the user a sense of a better interactive user interface experience. This article will show you how to use jQuery and send data through Ajax calls. For this example, we’re going to POST the following JavaScript object to our server. var post = { ...

After installation of hazelcast and adding to Java Build Path, you can write Main.class that starts cluster work public static void main(String[] args){ Config config = new Config(); // creates a new HazelcastInstance (a new node in a cluster) HazelcastInstance instance = Hazelcast.n...

Prerequisite A running MongoDB server, more details on that here. Setting Up a Java Project The MongoDB Java Driver is supplied as a JAR file and can be included in a project just like any other JAR. For example: Maven: add an entry to the <dependencies> section of your pom.xml. &lt...

MongoClient.connect('mongodb://localhost:27017/myNewDB',function (err,db) { if(err) console.log("Unable to connect DB. Error: " + err) else console.log('Connected to DB'); db.close(); }); myNewDB is DB name, if it does not exists in database then it...

In GraphQL the Schema defines the root execution queries and mutations as well as the types for your data. Schema Object Type The Person type has two fields, one is a standard Scalar type and the other represents a relationship to a list of other Person types that are 'friends'. Linking other type...

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/In async.series,all the functions are executed in series and the consolidated outputs of each function is passed to the final callback. e.g/ var async = require('async'); async.series([ function (callback) { console.log('First Execute..'); callback(null, 'userPersonalData'); }, function (cal...

The basic syntax of find() method with projection is as follows > db.COLLECTION_NAME.find({},{KEY:1}); If you want to show all documents without the age field then the command is as follows db.people.find({},{age : 0}); If you want to show all documents the age field then the command is a...

In MongoDB, projection means selecting only the necessary data rather than selecting whole of the data of a document. The basic syntax of find() method with projection is as follows > db.COLLECTION_NAME.find({},{KEY:1}); If you want to to show all document without the age field then the comm...

Using sequence function you can easily describe a message that calls a list of other messages. It's useful when dealing with semantics of your messages. Example 1: You are making a game engine, and you need to refresh the screen on every frame. module Video exposing (..) type Message = module Vid...

Detailed instructions on getting optimization set up or installed.

RDBMSGraph DatabaseTablesGraphsRowsNodesColumns and DataProperties and its valuesConstraintsRelationshipsJoinsTraversal

To register your methods, the class containing the EventHandler(s) must implement the Listener interface. import org.bukkit.event.Listener; public final class ListenerClass implements Listener { } You need to register the event listener by adding the following call to your onEnable method in...

Creating a basic block Creating a basic item Writing a Hello command Writing an Event Handler Getting started with Capabilities [1.8+]

When using the .get() method whatever is in the entry widget will be converted into a string. For example, regardless of the type of input(It can be a number or sentence), the resulting outcome will be a string. If the user types 4 the output will be "4" as in a string. To get an int from ...

Creating an event listener in Forge is very similar to creating one in Bukket. Creating the listener class requires a lot less. There's no interface to implement or other imports. public class ListenerClass { } //perfectly valid event listener class Registering it requires passing the instance ...

The andThen function allows update call composition. Can be used with the pipeline operator (|>) to chain updates. Example: You are making a document editor, and you want that each modification message you send to your document, you also save it: import Update.Extra exposing (andThen) import U...