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Yes, you can use capped parameter along with max size. Following is the syntax −db.createCollection("yourCollectionName", {capped:true, size:yourSizeInBytes, max:howManyRecordsYouWant})Let us first create a collection with capped:true −> db.createCollection("limitTheNumberOfRecordsDemo", {capped:true, size:200024, max:3}) { "ok" : 1 }We will now create a collection with documents −> db.limitTheNumberOfRecordsDemo.insertOne({"ClientName":"James Brown"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9e601b50a6c6dd317adad") } > db.limitTheNumberOfRecordsDemo.insertOne({"ClientName":"Sam Williams"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9e60bb50a6c6dd317adae") } > db.limitTheNumberOfRecordsDemo.insertOne({"ClientName":"David Miller"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9e612b50a6c6dd317adaf") } > db.limitTheNumberOfRecordsDemo.insertOne({"ClientName":"Carol Taylor"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9e61ab50a6c6dd317adb0") } > db.limitTheNumberOfRecordsDemo.insertOne({"ClientName":"Adam Smith"}); { "acknowledged" ... Read More
The HTML DOM Anchor origin property returns the protocol, hostname and port number of the href attribute value, for example, https://www.demo.com:6064 Following is the syntax−anchorObj.originLet us now see an example to implement the DOM Anchor origin property −Example Live Demo Company Products Display href Part Display origin Display hreflang function display() { var a = document.getElementById("mylink").href; document.getElementById("myid").innerHTML = a; } function display2() { var a = document.getElementById("mylink").origin; document.getElementById("myid").innerHTML = a; } function display3() { var a = document.getElementById("mylink").hreflang; document.getElementById("myid").innerHTML = a; } OutputClick on the “Display origin” button−
Tringle is a closed figure with three sides. An equilateral triangle has all sides equal. Area and perimeter of an equilateral triangle can be found using the below formula, Area of equilateral triangle = (√3)/4*a2Perimeter of equilateral triangle = 3 * aLogic of CodeTo find the area of an equilateral triangle program uses square-root and power functions. The math library has both these functions and can be used to do the calculation in the program.The below code display program to calculate the area and perimeter of an equilateral triangle, Example Live Demo#include #include int main(){ int side = ... Read More
The HTML DOM Input Date name property returns a string, which is the name attribute of input date. User can also set it to a new string.SyntaxFollowing is the syntax −Returning string valueinputDateObject.nameSetting name attribute to a string valueinputDateObject.name = ‘String’ExampleLet us see an example of Input Date name property − Live Demo Input Date Name Date Select: Change name value var inputDate = document.getElementById("date"); var divDisplay = document.getElementById("divDisplay"); divDisplay.textContent = 'Name of date input: '+inputDate.name; function changeNameValue() { if(inputDate.name == 'Monday'){ ... Read More
The HTML DOM Input Time stepdown() method defines the number of minutes the Time field should decrease.SyntaxFollowing is the syntax −Calling stepDown method with a number, which by default is equal to 1inputTimeObject.stepDown(number)ExampleLet us see an example of Input Time stepDown method − Live Demo Input Time stepDown() form { width:70%; margin: 0 auto; text-align: center; } * { padding: 2px; margin:5px; } input[type="button"] { border-radius: 10px; } Time-stepDown( ... Read More
In this section we are going to create a Whatsapp chatbots, but unlike few other chatbots for twitter or facebook, whatsapp chatbots don’t run on the platform directly because of whatsapp’s policies.But there is a way to get is done, using selenium, a very smart package in python with which developer’s can automate the browser’s activity. With this we can make use of whatsapp-web through the browser.RequirementsWe need three basic things to get things done: Selenium.We can install selenium very easily using pip, just run below command on your terminal −$pip install seleniumChrome/firefox or any other webdriver.As I using chrome ... Read More
In C we have used Files. To handle files, we use the pointer of type FILE. So the FILE is a datatype. This is called the Opaque datatype. So its implementation is hidden. The definition of the FILE is system specific. This is the definition of FILE in Ubuntu System −FILE Definitionstruct _IO_FILE { int _flags; /* High-order word is _IO_MAGIC; rest is flags. */ #define _IO_file_flags _flags /* The following pointers correspond to the C++ streambuf protocol. */ /* Note: Tk uses the _IO_read_ptr and _IO_read_end fields directly. */ char* _IO_read_ptr; /* Current read ... Read More
Whenever we execute SQL statements using the executeQuery() method, it returns a ResultSet object which holds the tabular data returned by the SELECT queries (in general).The ResultSet object contains a cursor/pointer which points to the current row. Initially this cursor is positioned before first row (default position).You can move the cursor of the ResultSet object to the last row from the current position, using the last() method of the ResultSet interface.rs.last()This method returns a boolean value specifying whether the cursor has been moved to the last row successfully.If there are no rows in the current ResultSet object this method returns false, else ... Read More
Use delete operator to unset variable in MongoDB shell. Following is the syntax −delete yourVariableName;Let us now implement the above syntax in order to unset variable in MongoDB shell. First, print the variable name −> customerDetail;This will produce the following output −2019-05-08T22:29:17.361+0530 E QUERY [js] ReferenceError: customerDetail is not defined : @(shell):1:1Now you can set a value in the above variable. Following is the query −> customerDetail={"CustomerFirstName":"Chris"};This will produce the following output −{ "CustomerFirstName" : "Chris" }Following is the query to show the value of a variable −> customerDetail; This will produce the following output −{ "CustomerFirstName" : "Chris" }Following ... Read More
Use the UIManager to customize the MenuBar:JMenuBar menuBar = new JMenuBar(); UIManager.put("MenuBar.background", Color.ORANGE);We have used the following above to update the background color of the MenuBar:UIManager.put("MenuBar.background", Color.ORANGE);The following is an example to customize MenuBar and change the background color:package my; import java.awt.Color; import java.awt.event.KeyEvent; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.UIManager; public class SwingDemo { public static void main(final String args[]) { JFrame frame = new JFrame("MenuBar Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JMenuBar menuBar = new JMenuBar(); UIManager.put("MenuBar.background", Color.ORANGE); JMenu fileMenu = new JMenu("File"); ... Read More