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You can use $in operator to find with multiple array items. 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.findByMultipleArrayDemo.insertOne({"StudentFirstName":"John", "StudentLastName":"Smith", "StudentCoreSubject":["Compiler", "Operating System", "Computer Networks"]}); { "acknowledged" : true, "insertedId" : ObjectId("5c7ef07b559dd2396bcfbfc4") } >db.findByMultipleArrayDemo.insertOne({"StudentFirstName":"Carol", "StudentLastName":"Taylor", "StudentCoreSubject":["MongoDB", "MySQL", "SQL Server"]}); { "acknowledged" : true, "insertedId" : ObjectId("5c7ef09d559dd2396bcfbfc5") } >db.findByMultipleArrayDemo.insertOne({"StudentFirstName":"Bob", "StudentLastName":"Taylor", "StudentCoreSubject":["MongoDB", "MySQL", "SQL Server"]}); { "acknowledged" : true, "insertedId" : ObjectId("5c7ef0c7559dd2396bcfbfc6") } >db.findByMultipleArrayDemo.insertOne({"StudentFirstName":"David", "StudentLastName":"Johnson", "StudentCoreSubject":["Compiler", "Operating System", "Computer Networks"]}); { "acknowledged" : true, ... Read More
Let us first create a demo tablemysql> create table excludeCertainColumnsDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(100), -> StudentAge int, -> StudentMarks int, -> StudentAddress varchar(200) -> ); Query OK, 0 rows affected (0.50 sec)Now you can check the description of table with the help of desc command. The query is as follows −mysql> desc excludeCertainColumnsDemo;The following is the output+----------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------+--------------+------+-----+---------+----------------+ | ... Read More
This example demonstrate about How to detect when an Android app goes to the background and come back to the foregroundStep 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. ss In the above code, we have taken text view to show an application status.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.app.ActivityManager; import android.content.ComponentName; import android.content.Context; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.widget.TextView; import java.util.List; public class MainActivity extends FragmentActivity ... Read More
In C or C++, we can use the constant variables. The constant variable values cannot be changed after its initialization. In this section we will see how to change the value of some constant variables.If we want to change the value of constant variable, it will generate compile time error. Please check the following code to get the better idea.Example#include main() { const int x = 10; //define constant int printf("x = %d", x); x = 15; //trying to update constant value printf("x = %d", x); }Output[Error] assignment of read-only variable 'x'So this is generating ... Read More
Here we will see how the C variables are scoped. The variables are always statically scoped in C. Binding of a variable, can be determined by the program text. These are independent of runtime function call stack.Let us see one example to get the idea.Example# include int x = 0; int my_function() { return x; } int my_function2() { int x = 1; return my_function(); } int main(){ printf("The value is: %d", my_function2()); }OutputThe value is: 0Here the result is 0. Because the value returned by my_function() is not depends on the function, which is ... Read More
In this program we will see how to find nth power of a number.Problem StatementWrite 8085 Assembly language program to find nth power of a number. The base is stored at location 8000H, and the exponent is stored at 8001H. Store the result at 8002H.DiscussionIn 8085, we cannot perform the multiplication operation directly. Here we are writing a subroutine to perform the multiplication by using repetitive addition. To perform nth power of a number, we have to multiply the number n times. The n value is used as a counter. If the base is 03H, exponent is 05H, then the ... Read More
Before getting into an example, we should know what gravity view in android is. Gravity view allows us to utilize the motion sensors of an Android device and allow the end user to explore the product by rotating his device.This example demonstrates How to use Gravity View for 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 − Open build.gradle and add design support library dependency.apply plugin: 'com.android.application' android { packagingOptions { exclude 'META-INF/proguard/androidx-annotations.pro' } packagingOptions ... Read More
include action lets you insert files into the page being generated. The syntax looks like this −Unlike the include directive, which inserts the file at the time the JSP page is translated into a servlet, this action inserts the file at the time the page is requested.
The tag is used to parse numbers, percentages, and currencies.AttributeThe tag has the following attributes −AttributeDescriptionRequiredDefaultValueNumeric value to read (parse)NoBodytypeNUMBER, CURRENCY, or PERCENTNonumberparseLocaleLocale to use when parsing the numberNoDefault localeintegerOnlyWhether to parse to an integer (true) or floating-point number (false)NofalsepatternCustom parsing patternNoNonetimeZoneTime zone of the displayed dateNoDefault time zonevarName of the variable to store the parsed numberNoPrint to pagescopeScope of the variable to store the formatted numberNopageA pattern attribute is provided that works just like the pattern attribute for the tag. However, in the case of parsing, the pattern attribute tells the parser what format to expect.Example ... Read More
The LocalDateTime can be formatted with the specified formatter using the format() method in the LocalDateTime class in Java. This method requires a single parameter i.e. the LocalDateTime object to be formatted and it returns the formatted LocalDateTime with the specified formatter.A program that demonstrates this is given as follows −Example Live Demoimport java.util.*; import java.time.*; import java.time.format.DateTimeFormatter; public class Main { public static void main(String[] args) { LocalDateTime ldt = LocalDateTime.parse("2019-02-18T14:30:47"); System.out.println("The LocalDateTime is: " + ldt); DateTimeFormatter dtf = DateTimeFormatter.ISO_TIME; System.out.println("The formatted LocalDateTime is: " + ... Read More