The $unwind operator in MongoDB is the same for each array, it returns the mapping document. Here is the demo of $unwind operator in MongoDB.To understand the concept, let us create a collection with the document. The query to create a collection with a document is as follows −> db.unwindOperatorDemo.insertOne({"StudentName":"Larry", ... Read More

Here we will see what is the meaning of volatile qualifier in C++. The volatile qualifier is applied to a variable when we declare it. It is used to tell the compiler, that the value may change at any time. These are some properties of volatile.The volatile keyword cannot remove ... Read More

Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to ... Read More

You need to use some code in order to convert a string to numerical values in MongoDB.Let us first create a collection with a document. The query to create a collection with a document is as follows:> db.convertStringToNumberDemo.insertOne({"EmployeeId":"101", "EmployeeName":"Larry"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c7f56528d10a061296a3c31") } > ... Read More

To know which storage engine is used in MongoDB, you can use storageEngine. The syntax is as follows −db.serverStatus().storageEngine;To know all the configuration details of storage engine, you can use the following syntax:db.serverStatus().yourStorageEngineName;Let us implement the above syntax to know which storage engine is being used in MongoDB. The query ... Read More

We have used the integer and character variables many times in our program. Here we will see how they are stored in the memory.In C the character values are also stored as integers. In the following code, we shall put 270 into a character type data. So the binary equivalent ... Read More

This example demonstrate about How to find its first non-repeating character in a given string in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. ... Read More

To set Octet value in Java, you need to use the setAtX() method. Here, X is the index wherein you need to set the value i.e. to set value at index 1, use the setAt1() and value as a parameter.Let us first see what we need to work with JavaTuples. ... Read More

The character type data is stored by its ASCII value internally in C or C++. If we want to print a single character as integer, we will get the ASCII value. But when we are trying to print more than one character using a single quote, then it will print ... Read More

This example demonstrate about How to remove duplications from unsorted linked list in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.     ... Read More