Class not found

Question

This is the error I am getting.

Fatal error: Class 'Database' not found in C:\\wamp\\www\\midtermexam\\read.php on line 11

<?php
    include 'database.php';
    $id = null;
    if ( !empty($_GET['id'])) {
        $id = $_REQUEST['id'];
    }

    if ( null==$id ) {
        header("Location: index.php");
    } else {
        $pdo = Database::connect(); //HERE IS THE LINE PROBLEM
        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $sql = "SELECT * FROM tbl_students where id = ?";
        $q = $pdo->prepare($sql);
        $q->execute(array($id));
        $data = $q->fetch(PDO::FETCH_ASSOC);
        Database::disconnect();
    }
?>

And here is my database file database.php

<?php 
   $DB_HOST = 'localhost'; 
   $DB_USER = 'root'; 
   $DB_PASS = '';
   $DB_NAME = 'midtermexam'; 
   try{ 
       $DB_con = new PDO("mysql:host={$DB_HOST};
       dbname={$DB_NAME}",$DB_USER,$DB_P‌​ASS); 
       $DB_con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
  } 
  catch(PDOException $e){
       echo $e->getMessage(); 
  } ?> 

Answer 1

Try this, I have not tested it but it should be fairly close.

 <?php 
# database.php
#############################
$DB_HOST = 'localhost'; 
$DB_USER = 'root'; 
$DB_PASS = ''; 
$DB_NAME = 'midtermexam'; 
try
{ 
    $DB_con = new PDO("mysql:host={$DB_HOST}; dbname={$DB_NAME}",$DB_USER,$DB_P‌​ASS); 
    $DB_con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
} 
catch(PDOException $e)
{ 
    echo $e->getMessage(); 
} 

#############################
?>

<?php
# read.php
#############################
$id = null;
if ( !empty($_GET['id'])) {
  $id = $_REQUEST['id'];
}

if ( null==$id )
{
  header("Location: index.php");
} 
else 
{
  $sql = "SELECT * FROM tbl_students where id = ?";
  $q = $DB_con->prepare($sql);
  $q->execute(array($id));
  $data = $q->fetch(PDO::FETCH_ASSOC);
}

#############################
?>

From what I can tell you are using the name of the database file as the class name, however, you have created the instance of the database connection as $DB_con within the database.php file.

This may help a little for further reading. Sitepoint PDO

If you get any issues with this give us a shout.

Good Luck,

Blinky

Answer 2

step 1： check your database configuation in database.php, make sure that all necessary params have been set and all the values are correct.

step 2： if step 1 can not solve your problem, make sure your database server is running, your network is alive.

that's my view, hope it's useful for you.