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How to filter records in postgreys table with bytea field ?

Before telling about solution please avoid storing data in postgrey bytea field if you need a filter on stored data, instead store it in jsonb data type. Yes but we don’t have all time a luxury to change the data type if we are working on a legacy system. hence if you are in the same boat you can write the queries as mentioned below. Take example of following json stored in bytea data type of…

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Create custom session handler in php using mysql database

dbConnection = new PDO('mysql:dbname=db_based_session;host:localhost', 'XXX', 'XXX'); //set the default session expiration time $this->sessionLifeTime = get_cfg_var('session.gc_maxlifetime'); if ($this->dbConnection) return true; else return false; //if it was a file based then we have to create file for all session and have to store in specified path } function close() { //expire time for this…

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#mysql #PDO #php #session

Find second highest number in an integer Array

package dsProblem; /** * Created by gyaneshwar on 26/11/2016. */ public class SecondLargestNumber { int[] a; public int[] getA() { return a; } public void setA(int[] a) { this.a = a; } public int findSecondLargestNumber() { int largestEle = 0; int secondLargestEle = 0; for (int aa : a) { if (largestEle < aa) { secondLargestEle = largestEle; largestEle = aa; } else if (secondLargestEle < aa) {…

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Given a dictionary and a list of letters find all valid words that can be built with the letters

package dsProblem; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** * Created by gyaneshwar on 26/11/2016. */ public class DictionaryWithChar { List dictionary; char[] characters; Map alphabet; public DictionaryWithChar(List dictionary, char[] ch) { this.dictionary = dictionary; this.characters = ch; this.alphabet = new HashMap();…

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#Hash Map #list #String

WhatsApp world best text messaging app I am fond of the way they maintain the simplicity of app with some of the greater features. Recently I got some interesting update on Android app.

Make text bold in the message : you just need to surround the text with star(*). Example : *hello world I am bold text in WhatsApp*

Make text Italic in the message : you just need to surround your text with the underscores (_) Example : _hello world I am italic text in whatsapp_ . But where is the underscore in the default android keyboard ? Below screenshot will help you to find out the hidden underscore. a. open second page of keyboard by pressing bottom left ?1:) b. open next keyboard screen by pressing =\<

3.Here is example screen for italic text

How to write bold and italic text in whatsApp message WhatsApp world best text messaging app I am fond of the way they maintain the simplicity of app with some of the greater features.

Install laravel in Mac OS X and Linux

Laravel has awesome documentation but still I Faced problem while installation.Below are the Just three commands which can help you to run Laravel in your mac book or Linux systems like ubuntu and any other distribution. $ cd ~ $ curl -sS https://getcomposer.org/installer | php $ ./composer.phar global require "laravel/installer=~1.1" $ ./composer.phar create-project laravel/laravel --prefer-dist…

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#command #laravel #php

Remove duplicate character from a given string program in c++

There are many way to write a program to solve a problem. removing duplicate character from a given string can also solve in many way with different time and space complexity. I have written three functions which can be used to solve this. 1. Using simple brute force method with time complexity: O(n^2) space complexity: O(1) 2. First sort the string and then remove the duplicate character with…

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#Hash Map #String

Implementation of Golang routines

Now the development of software is an easy task but scaling things for millions of users and performing things in the millisecond are the most challenging and interesting task. Parallel processing is the first thing comes in mind when we think about scaling and performance. Java is the best in terms of concurrency and threading, but java threading is heavy and needs lots of attention during…

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#concurrency #golang #goroutines

Solo trip is not a fun. It’s just a time when you explore yourself and world together.

Heard a lot about solo trip so thought to let’s experience it. After resigning from one job, I want to take a break. Time after resignation is the best to do such things no deadlines, no coding, no programming, no urgent calls, no job just me with myself. I booked bus ticket for Gokarna and just moved on for three days holiday without knowing how’s the weather, whether it’s good time to go or…

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Print all nodes of binary at distance k from a given node

#include using namespace std; class Node { public: Node *leftChild; Node *rightChild; Node *parent; int value; int visited; Node(int val) { this->value = val; this->leftChild = NULL; this->rightChild = NULL; this->parent = NULL; this->visited=0; } ~Node(); }; void printKthDistanceNode(Node *root, int k) { //lets mark root at visited root->visited=1; if (root == NULL && k > 0) { //for leaf node //…

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Implementation of Finite State Machine

stateName = $state; } abstract function execute(); } //transition class class Transitions { public $transitionName; public $toState; function __construct($transition, $toState) { $this->transitionName = $transition; $this->toState = $toState; } function execute() { echo "Executing Transition " . $this->transitionName . "\n"; } } /** * implementation of fsm */ class SimplestFSM { public $states;…

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#design patterns #fsm #inheritance

Multiple Inheritance (Horizontal) in php

hello(); echo $myClass->bye(); echo $myClass->whatsup(); A Developer Gy@n!

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#inheritance

Implementation of array iterator in php

= 5.0.0) * Return the current element * @link http://php.net/manual/en/iterator.current.php * @return mixed Can return any type. */ public function __construct($array){ $this->Arr=$array; } public function current() { return current($this->Arr); } /** * (PHP 5 >= 5.0.0) * Move forward to next element * @link…

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Singleton design pattern in php

<?php /** * Created by JetBrains PhpStorm. * User: gyani * Date: 28/3/15 * Time: 5:22 PM */ class SingletonDesignPattern { //just for demo there will be only one instance private static $instanceCount =0; //create the private instance variable private static $myInstance=null; //make constructor private so no one create object using new Keyword private function __construct(){} //no one clone the…

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My Phone screen with google awesome :)

Cloning the Javascript object

Javascript keep the same reference for original and cloned objects, so when you change anything in original object it will change in cloned object also and vice versa. So we can’t simply copy one object to another. Below i have copied each property of original object to cloned using recursive approach.

/* * Created with JetBrains PhpStorm. * User: gyani * Date: 29/3/15 * Time: 11:38 AM * To…

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Program to display bottom view of binary tree

#include #include #include #include using namespace std; class Node { public: int horizontalHeight; int data; Node * leftChild; Node * rightChild; Node(int value) { this->data = value; this->leftChild = NULL; this->rightChild = NULL; this->horizontalHeight=INT_MAX; } }; class MyTree { private:Node * root; public: MyTree(Node * myNode) { this->root = myNode; this->root->horizontalHeight=0; } void…

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#binary tree #tree

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