class.pdo.db.php

<?php
class Db
{
    private $_connection;
    private static $_instance; //The single instance
    private $_host = DB_HOST;
    private $_username = DB_USER;
    private $_password = DB_PASSWORD;
    private $_database = DB_DB;

    /*
    Get an instance of the Database
    @return Instance
    */
    public static function getInstance()
    {
        if (!self::$_instance) { // If no instance then make one
            self::$_instance = new self();
        }
        return self::$_instance;
    }

    // Constructor
    private function __construct()
    {
        try {

            $this->_connection  = new \PDO("mysql:host=$this->_host;dbname=$this->_database", $this->_username, $this->_password);
            /*** echo a message saying we have connected ***/
            echo 'Connected to database';
        } catch (PDOException $e) {
            echo $e->getMessage();
        }
    }

    // Magic method clone is empty to prevent duplication of connection
    private function __clone()
    {
    }

    // Get mysql pdo connection
    public function getConnection()
    {
        return $this->_connection;
    }
}

/**
 * And you can use it as such in a class
 * */
 
 class Post {

    public function __construct(){
        $db = Db::getInstance();
        $this->_dbh = $db->getConnection();

    }

    public function getPosts()
    {
        try {

            /*** The SQL SELECT statement ***/
            $sql = "SELECT * FROM posts";
            foreach ($this->_dbh->query($sql) as $row) {
                var_dump($row);
            }

            /*** close the database connection ***/
            $this->_dbh = null;
        } catch (PDOException $e) {
            echo $e->getMessage();
        }
    }

}

I already created class DB, and my second class is XYZ.

`
/*

• Mysql database class - only one connection alowed
  /
  class Configuration {
  private $_connection;
  private static $_instance; //The single instance
  private $_host = "localhost";
  private $_username = "root";
  private $_password = "";
  private $_database = "centreonyx";
  /
  Get an instance of the Database
  @return Instance
  */
  public static function getInstance() {
  if(!self::$_instance) { // If no instance then make one
  self::$_instance = new self();
  }
  return self::$_instance;
  }
  // Constructor
  private function __construct() {
  $this->_connection = new mysqli($this->_host, $this->_username, $this->_password, $this->_database);

    // Error handling
    if(mysqli_connect_error()) {
    	trigger_error("Failed to conencto to MySQL: " . mysql_connect_error(),
    		 E_USER_ERROR);
    }
  

  }
  // Magic method clone is empty to prevent duplication of connection
  private function __clone() { }
  // Get mysqli connection
  public function getConnection() {
  return $this->_connection;
  }
  }

require_once 'Config/Configuration.php';
class XYZ {
public function _construct()
{
$db = Configuration::getInstance();
$this->mysqli = $db->getConnection();
}
function insertBlogDetails($bcat,$bname,$bdesc,$bdate,$bwritter)
{
/check blog exist/
$sqlToCheckBlog="SELECT * FROM blog_details WHERE Blog_Name='".$bname."'";
$resultQueryCheck=$this->mysqli->query($sqlToCheckBlog);
print_r($resultQueryCheck);
exit();
}
}`

I m using this way.

please help me where i m doing wrong

Hi,
How do I add ? charset=utf8

After using this class to run a DELETE query, how do I see what was deleted or the affected rows?