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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to find all objects created before specified Date in MongoDB?
You can use $lt operator for this. Let us create a collection with documents −> db.beforeSpecifyDateDemo.insertOne({"UserLoginDate":new ISODate('2016-03-21')}); { "acknowledged" : true, "insertedId" : ObjectId("5cbd91e4de8cc557214c0e0d") } > db.beforeSpecifyDateDemo.insertOne({"UserLoginDate":new ISODate('2016-05-11')}); { "acknowledged" : true, "insertedId" : ObjectId("5cbd91ecde8cc557214c0e0e") } > db.beforeSpecifyDateDemo.insertOne({"UserLoginDate":new ISODate('2017-01-31')}); { "acknowledged" : true, "insertedId" : ObjectId("5cbd91f9de8cc557214c0e0f") } > db.beforeSpecifyDateDemo.insertOne({"UserLoginDate":new ISODate('2018-05-15')}); { "acknowledged" : true, "insertedId" : ObjectId("5cbd9206de8cc557214c0e10") } > db.beforeSpecifyDateDemo.insertOne({"UserLoginDate":new ISODate('2019-04-01')}); { "acknowledged" : true, "insertedId" : ObjectId("5cbd9211de8cc557214c0e11") }Display all documents from a collection with the help of find() method. The query is as follows −> db.beforeSpecifyDateDemo.find().pretty();This will produce the ...
Read MoreRetrieve the position in an Array in MongoDB?
You can use the concept of map reduce to get the position in an array. Let us first create a collection with documents −> db.retrievePositionDemo.find(); { "_id" : ObjectId("5cd569ec7924bb85b3f4893f"), "Subjects" : [ "MySQL", "MongoDB", "Java" ] }Following is the query to display all documents from a collection with the help of find() method −> db.retrievePositionDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cd569ec7924bb85b3f4893f"), "Subjects" : [ "MySQL", "MongoDB", "Java" ] }Following is the query to retrieve the position in an array in MongoDB ...
Read MoreHow to create a Borderless Window in Java?
To create a borderless window in Java, do not decorate the window. The following is an example to create a BorderLess Window −Examplepackage my; import java.awt.GraphicsEnvironment; import java.awt.GridLayout; import java.awt.Point; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.JWindow; import javax.swing.SwingConstants; public class SwingDemo { public static void main(String[] args) throws Exception { JWindow frame = new JWindow(); JLabel label1, label2, label3; frame.setLayout(new GridLayout(2, 2)); label1 = new JLabel("Id", SwingConstants.CENTER); label2 = new JLabel("Age", SwingConstants.CENTER); label3 = new JLabel("Password", SwingConstants.CENTER); ...
Read MoreDoes Java support multiple inheritance? Why? How can we resolve this?
Whenever, you extend a class a copy of superclass’s members is available to the subclass object and, when you can call the method of the superclass using the object of the subclass.ExampleIn the following example, we have a class named SuperClass with a method with name demo(). We are extending this class with another class (SubClass).Now, you create an object of the subclass and call the method demo(). Live Democlass SuperClass{ public void demo() { System.out.println("demo method"); } } public class SubClass extends SuperClass { public ...
Read MoreHTML DOM Input Email disabled Property
The HTML DOM Input Email disabled property sets/returns whether Input Email is enabled or disabled.SyntaxFollowing is the syntax −Returning boolean value - true/falseinputEmailObject.disabledSetting disabled to booleanValueinputEmailObject.disabled = booleanValueBoolean ValuesHere, “booleanValue” can be the following −booleanValueDetailstrueIt defines that the input email is disabled.falseIt defines that the input email is not disabled and it is also the default value.ExampleLet us see an example of Input Email disabled property − Live Demo Input Email disabled form { width:70%; margin: 0 auto; text-align: center; } * { padding: ...
Read MorePrint missing elements that lie in range 0 – 99
It will display the missing values from the given set entered by the userGiven : array = {88, 105, 3, 2, 200, 0, 10}; Output : 1 4-9 11-87 89-99AlgorithmSTART STEP 1-> Take an array with elements, bool flag[MAX] to Fale, int i, j, n to size of array Step 2-> Loop For from I to 0 and i=0 Set flag[array[i]]=true End IF Step 3 -> End For Loop Step 4 -> Loop For from i to 0 and i=0) { flag[array[i]] = true; //Making the value of the elements present in ...
Read MoreHow can I update and increment two fields in one command in MongoDB?
Let us first create a collection with documents −> db.incrementDemo.insertOne({"Value1":10, "Value2":20}); { "acknowledged" : true, "insertedId" : ObjectId("5cbdaf07de8cc557214c0e15") }Display all documents from a collection with the help of find() method. The query is as follows −> db.incrementDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cbdaf07de8cc557214c0e15"), "Value1" : 10, "Value2" : 20 }Following is the query to increment two fields in one command in MongoDB −> db.incrementDemo.update({}, { $inc : { Value1 : 1, Value2 : 1 } }); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check both the fields ...
Read MoreJava ResultSetMetaData getColumnTypeName() method with example
The getColumnTypeName() method of the ResultSetMetaData (interface) retrieves and returns the name of the datatype of the specified column in the current ResultSet object.This method accepts an integer value representing the index of a column and, returns a String value representing the name of the SQL data type of the specified column.To get the ResultSetMetaData object, you need to −Register the Driver: Select the required database register the Driver class of the particular database using the registerDriver() method of the DriverManager class or, the forName() method of the class named Class.DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get connection: Create a connection object by passing the URL ...
Read MoreHow to remove key fields in MongoDB?
To remove key fields in MongoFB, you can use $unset operator. Let us first create a collection with documents −>db.removeKeyFieldsDemo.insertOne({"StudentFirstName":"John", "StudentLastName":"Doe", "StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cc6c8289cb58ca2b005e672") } >db.removeKeyFieldsDemo.insertOne({"StudentFirstName":"John", "StudentLastName":"Smith", "StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5cc6c8359cb58ca2b005e673") }Following is the query to display all documents from a collection with the help of find() method −> db.removeKeyFieldsDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cc6c8289cb58ca2b005e672"), "StudentFirstName" : "John", "StudentLastName" : "Doe", "StudentAge" : 23 } { "_id" : ObjectId("5cc6c8359cb58ca2b005e673"), "StudentFirstName" : "John", "StudentLastName" : "Smith", ...
Read MoreWrite a program that produces different results in C and C++
Here we will see some program that will return different results if they are compiled in C or C++ compilers. We can find many such programs, but here we are discussing about some of them.In C and C++, the character literals are treated as different manner. In C, they are treated as int but in C++, they are treated as characters. So if we check the size using sizeof() operator, it will return 4 in C, and 1 in C++.Live Demo For C.Example Live Demo#include int main() { printf("The character: %c, size(%d)", 'a', sizeof('a')); }Output(C)The character: a, size(4)Live Demo For ...
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