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Articles on Trending Technologies
Technical articles with clear explanations and examples
Instant get() method in Java
The value of the required ChronoField for an Instant can be obtained using the get() method in the Instant class in Java. This method requires a single parameter i.e. the ChronoField and it returns the value of the ChronoField that was passed as a parameter.A program that demonstrates this is given as follows −Example Live Demoimport java.time.*; import java.time.temporal.ChronoField; import java.time.temporal.ValueRange; public class Demo { public static void main(String[] args) { Instant i = Instant.now(); int micro = i.get(ChronoField.MICRO_OF_SECOND); System.out.println("The current Instant is: " + i); System.out.println("The MICRO_OF_SECOND ...
Read MoreArrayBlockingQueue add() method in Java
To add elements to the ArrayBlockingQueue class, use the add() method.The syntax is as followsboolean add(E ele)Here, ele is the element to be added to the queue. To work with ArrayBlockingQueue class, you need to import the following packageimport java.util.concurrent.ArrayBlockingQueue;The following is an example to add elements in Java ArrayBlockingQueue classExample Live Demoimport java.util.concurrent.ArrayBlockingQueue; public class Demo { public static void main(String[] args) { ArrayBlockingQueue q = new ArrayBlockingQueue(7); q.add(100); q.add(250); q.add(300); q.add(450); q.add(550); q.add(600); q.add(700); System.out.println("ArrayBlockingQueue = " + q); } }OutputArrayBlockingQueue = [100, 250, 300, 450, 550, 600, 700]
Read MoreMySQL query to skip the duplicate and select only one from the duplicated values
The syntax is as follows to skip the duplicate value and select only one from the duplicated values −select min(yourColumnName1), yourColumnName2 from yourTableName group by yourColumnName2;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table doNotSelectDuplicateValuesDemo -> ( -> User_Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> User_Name varchar(20) -> ); Query OK, 0 rows affected (0.78 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> insert into doNotSelectDuplicateValuesDemo(User_Name) values('John'); Query OK, 1 row affected ...
Read MoreSorting in C++
In this section we will see how to perform sorting algorithm in C++. A sorted array is an array in which each of the elements are sorted in some order such as numerical, alphabetical etc. There are many algorithms to sort a numerical array such as bubble sort, insertion sort, selection sort, merge sort, quick sort, heap sort etc. More details about sorting the array using selection sort are given below.The selection sort is a sorting method that yields a sorted array. It does so by repeatedly finding the smallest element in the array and interchanging it with the element ...
Read MoreAdd a temporary column in MySQL where the values depend on another column?
You can use CASE statement for this and set conditions to get result in the temporary column.Let us first create a table −mysql> create table DemoTable ( EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, EmployeeName varchar(20), EmployeeSalary int, EmployeeExperience int ); Query OK, 0 rows affected (0.64 sec)Following is the query to insert some records in the table using insert command −mysql> insert into DemoTable(EmployeeName, EmployeeSalary, EmployeeExperience) values('Larry', 4500, 5); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(EmployeeName, EmployeeSalary, EmployeeExperience) values('Mike', 130000, 8); Query OK, 1 row affected (0.21 sec) mysql> ...
Read MoreExact count of all rows in MySQL database?
To exactly count all rows, you need to use the aggregate function COUNT(*). The syntax is as follows −select count(*) as anyAliasName from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table CountAllRowsDemo -> ( -> Id int, -> Name varchar(10), -> Age int -> ); Query OK, 0 rows affected (1.49 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> insert into CountAllRowsDemo values(1, 'John', 23); Query OK, 1 row affected (0.15 ...
Read MoreAdd a value to Septet class in JavaTuples
The addAtX() method is used to add value to the Septet Tuple. The index can be set here with the X i.e. the place where the value gets added.Let us first see what we need to work with JavaTuples. To work with Septet class in JavaTuples, you need to import the following package −import org.javatuples.Septet;Note − Steps to download and run JavaTuples program If you are using Eclipse IDE to run Septet Class in JavaTuples, then Right Click Project → Properties → Java Build Path → Add External Jars and upload the downloaded JavaTuples jar file.The following is an example ...
Read MoreRename Root @ localhost username in MySQL?
The syntax is as follows to rename Root @localhostUPDATE MySQL.user SET user = ‘yourNewRootName’ WHERE user = 'root';To understand the above concept, let us check all the user names and host. The query is as followsmysql> select user, host from MySQL.user;The following is the output+------------------+-----------+ | user | host | +------------------+-----------+ | Bob | % | | Manish | % | | User2 | % ...
Read MoreUsing MySQL SELECT for simple BOOLEAN evaluation?
You can use CASE statement for this. Let us see an example −mysql> create table BooleanEvaluationDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstValue int, -> SecondValue int -> ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into BooleanEvaluationDemo(FirstValue, SecondValue) values(10, 5); Query OK, 1 row affected (0.20 sec) mysql> insert into BooleanEvaluationDemo(FirstValue, SecondValue) values(15, 20); Query OK, 1 row affected (0.16 sec) mysql> insert into BooleanEvaluationDemo(FirstValue, SecondValue) values(50, 40); Query OK, 1 row affected (0.14 ...
Read MoreOnly insert if a value is unique in MongoDB else update
You can use upsert i.e. whenever you insert a value and it already exist then update would be performed. If the value does not already exist then it would get inserted.Let us first create a collection with documents> db.onlyInsertIfValueIsUniqueDemo.insertOne({"StudentName":"Larry", "StudentAge":22}); { "acknowledged" : true, "insertedId" : ObjectId("5c9a633815e86fd1496b38a4") } > db.onlyInsertIfValueIsUniqueDemo.insertOne({"StudentName":"Mike", "StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5c9a634a15e86fd1496b38a5") } > db.onlyInsertIfValueIsUniqueDemo.insertOne({"StudentName":"Sam", "StudentAge":24}); { "acknowledged" : true, "insertedId" : ObjectId("5c9a635015e86fd1496b38a6") }Following is the query to display all documents from a collection with the help of find() method> db.onlyInsertIfValueIsUniqueDemo.find().pretty();This will produce the following output{ "_id" ...
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