No database selected in php? - php

Question

i am working and new to php i am getting no database selected error;
here is the my code which is dd.php
<?php
include('database.php'); //include of db config file
$pdo = Database::connect();
$per_page = 2; // number of results to show per page
$sql = 'SELECT * FROM customers ORDER BY id DESC';
$result=mysql_query($sql) or die("ERROR".mysql_error()."*****".$sql);
$total_results = mysql_num_rows($sql);
$total_pages = ceil($total_results / $per_page);//total pages we going to have
//-------------if page is setcheck------------------//
if (isset($_GET['page'])) {
$show_page = $_GET['page']; //it will telles the current page
if ($show_page > 0 && $show_page <= $total_pages) {
$start = ($show_page - 1) * $per_page;
$end = $start + $per_page;
} else {
// error - show first set of results
$start = 0;
$end = $per_page;
}
} else {
// if page isn't set, show first set of results
$start = 0;
$end = $per_page;
}
// display pagination
$page = intval($_GET['page']);
$tpages=$total_pages;
if ($page <= 0)
$page = 1;
?>
fix error in this code one after another i am getting new error like mysql_num_rows() error ODBC#localhost acess denied????
plz help me out??
here is my database.php
<?php
class Database
{
private static $dbName = 'crud_tutorial' ;
private static $dbHost = 'localhost' ;
private static $dbUsername = 'root';
private static $dbUserPassword = '';
private static $cont = null;
public function __construct() {
die('Init function is not allowed');
}
public static function connect()
{
// One connection through whole application
if ( null == self::$cont )
{
try
{
{
self::$cont = new PDO( "mysql:host=".self::$dbHost.";"."dbname=".self::$dbName, self::$dbUsername, self::$dbUserPassword);
}
catch(PDOException $e){
die($e->getMessage());
}
}
return self::$cont;
}
public static function disconnect()
{
self::$cont = null;
}
}
?>

Answer 1

problem is due to mysql_* is deprecated replacing with mysqli_ works