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You can use only $pull operator that removes and updates the existing record in MongoDB. Let us first create a collection with documents −> db.removeDemo.insertOne( ... { ... "UserName" : "Larry", ... "UserDetails" : [ ... { ... "_id" : 101, ... "UserEmailId" : "976Larry@gmail.com", ... } ... ] ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5cc7f9f88f9e6ff3eb0ce446") } > db.removeDemo.insertOne( ... { ... ... Read More
To get the count of siblings of this node, use the getSiblingCount() method. Let’s say you have a node with 4 child nodes. Find the sibling of any of this node’s child node. Here, “eight” is the child node −eight.getSiblingCount());Note − Remember, a node is it’s own sibling.The following is an example to get the number of siblings of this node in a JTree −Examplepackage my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing (Product1 - P66778)"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Accessories (Product2 - P66779)"); DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Home Decor (Product3 - ... Read More
Let’s say you have saved the Login date of users. Now, you want the users who logged in between specific dates i.e. login date. For this, use $gte and $lt operator along with count(). Let us first create a collection with documents −> db.findDataByDateDemo.insertOne({"UserName":"John", "UserLoginDate":new ISODate("2019-01-31")}); { "acknowledged" : true, "insertedId" : ObjectId("5cdd8cd7bf3115999ed511ed") } > db.findDataByDateDemo.insertOne({"UserName":"Larry", "UserLoginDate":new ISODate("2019-02-01")}); { "acknowledged" : true, "insertedId" : ObjectId("5cdd8ce7bf3115999ed511ee") } > db.findDataByDateDemo.insertOne({"UserName":"Sam", "UserLoginDate":new ISODate("2019-05-02")}); { "acknowledged" : true, "insertedId" : ObjectId("5cdd8cf3bf3115999ed511ef") } > db.findDataByDateDemo.insertOne({"UserName":"David", "UserLoginDate":new ISODate("2019-05-16")}); { "acknowledged" : true, "insertedId" : ObjectId("5cdd8d00bf3115999ed511f0") } > db.findDataByDateDemo.insertOne({"UserName":"Carol", ... Read More
This is a C++ program in which we generate a undirected random graph for the given edges ‘e’. This algorithm basically implements on a big network and time complexity of this algorithm is O(log(n)).AlgorithmBegin Function GenerateRandomGraphs(), has ‘e’ as the number edges in the argument list. Initialize i = 0 while(i < e) edge[i][0] = rand()%N+1 edge[i][1] = rand()%N+1 Increment I; For i = 0 to N-1 Initialize count = 0 For j = 0 to e-1 ... Read More
Python uses a mechanism, which is known as "Call-by-Object", sometimes also called "Call by Object Reference" or "Call by Sharing"If you pass immutable arguments like integers, strings or tuples to a function, the passing acts like Call-by-value. It's different, if we pass mutable arguments.All parameters (arguments) in the Python language are passed by reference. It means if you change what a parameter refers to within a function, the change also reflects back in the calling function.Examplestudent={'Archana':28, 'krishna':25, 'Ramesh':32, 'vineeth':25} def test(student): new={'alok':30, 'Nevadan':28} student.update(new) print("Inside the function", student) return test(student) print("outside the function:", student)OutputInside the function ... Read More
The HTML DOM input hidden name property returns and alter the value of name attribute of input field of type=”hidden” in an HTML document.SyntaxFollowing is the syntax −1. Returning nameobject.name2. modifying nameobject.name=”text”ExampleLet us see an example of HTML DOM input hidden name property − Live Demo body{ text-align:center; background-color:#F19A3E; color:#fff; } .btn{ background-color:#3C787E; border:none; height:2rem; border-radius:50px; width:60%; margin:1rem auto; display:block; color:#fff; ... Read More
Here we will see one interesting Boolean matrix problem. One Boolean matrix is given which contains 0’s and 1’s. Our goal is to find where 1 is marked. If the 1 is marked at position mat[i, j], then we will make all entries to 1 of the row i and column j. Let us see an example. If the matrix is like below −1 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0Then after modification, it will be −1 1 1 1 1 1 0 1 1 1 0 1 1 1 1 1AlgorithmmatrixUpdate(matrix[R, ... Read More
As per the question, the task is to find the nearest prime number by adding the prime number starting from 2 if the number N is not Prime.Input: N=6 Output: 11ExplanationSince 6 is not prime add first prime to 6 i.e. 2 which will result to 8 now 8 is also not prime now add next prime after 2 which is 3 which will give 8+3 = 11. Hence 11 is a prime number output will be 11.AlgorithmSTART Step 1- > declare num=15, i = num/2 Step 2 -> Loop For k=2 and k
In order to convert NumberLong to String in MongoDB, you can use toString() −NumberLong('yourValue').valueOf().toString();To convert NumberLong to String, you can use valueOf() as well −NumberLong('yourValue').valueOf();Let us implement both the above syntaxes.Following is the query to convert NumberLong to String with toString() −> NumberLong('1000').valueOf().toString();This will produce the following output −1000Following is the query to convert NumberLong to Number with valueOf()> NumberLong('1000').valueOf();This will produce the following output −1000
The following is an example to add action listener to Button:Examplepackage my; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingDemo { private JFrame frame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingDemo(){ prepareGUI(); } public static void main(String[] args){ SwingDemo swingControlDemo = new SwingDemo(); swingControlDemo.showButtonDemo(); } private void prepareGUI(){ frame = new JFrame("Java Swing"); frame.setSize(500, 500); frame.setLayout(new GridLayout(3, 1)); frame.addWindowListener(new WindowAdapter() { ... Read More
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