Add Doctrine DBAL into own php project - php

Question

Trying to add Doctrine DBAL into my own project to use it to access my db etc. I don't have composer and i never used it. This is what i am trying to do according to the docu:
use Doctrine\Common\ClassLoader;
class Connection
{
var $connection;
//Constructor
public function __construct()
{
require_once "doctrine/Common/ClassLoader.php";
$classLoader = new ClassLoader('Doctrine', 'doctrine');
$classLoader->register();
$config = new Configuration();
$connectionParams = array(
'dbname' => 'mydb',
'user' => 'root',
'password' => "",
'host' => 'localhost',
'driver' => 'pdo_mysql',
);
$this->connection = \Doctrine\DBAL\DriverManager::getConnection($connectionParams, $config);
}
}
This is taken from here:
-http://docs.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html
and:
- http://docs.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/introduction.html
I have the Common and DBAL folder added into my project
My folder structure looks like this:
root
doctrine
DBAL
Common
php stuff
index.php (where connection.php) is executed
So what happens is that i either get "Cannot find class XY" or something similar, based upon what i change on the code. I never am able to execute it as it should following the tutorial.
What am i doing wrong here?
I just want to have the connection object, where i can start doing my stuff like useing the query builder etc...
I am completely lost here...
UPDATE: Installed composer as requested and have this Code now:
use Doctrine\DBAL\Configuration;
class Connection
{
var $connection;
//Constructor
public function __construct()
{
$config = new Configuration();
$connectionParams = array(
'url' => 'mysql://root:secret#localhost/mydb',
);
$this->connection = \Doctrine\DBAL\DriverManager::getConnection($connectionParams, $config);
}
Which is the 2nd code example in my 1st link. Tells me " Class 'Doctrine\DBAL\Configuration' not found ". Funny thing is, that IntelliJ can perfectly autocomplete the path (suggests me Configuration when finishing DBAL in the path) but PHP doesn't find it. If i remove the new Configuration PHP just tells me, that it doesn't find the DriverManager...
I installed it correctly via composer though, at least composer tells me it is installed correctly now (Where does composer save the libs?)

Answer 1

You now need to require composers autoload file.
require __DIR__.'/vendor/autoload.php';
use Doctrine\DBAL\Configuration;
class Connection
{
var $connection;
//Constructor
public function __construct()
{
$config = new Configuration();
$connectionParams = array(
'url' => 'mysql://root:secret#localhost/mydb',
);
$this->connection = \Doctrine\DBAL\DriverManager::getConnection($connectionParams, $config);
}
Please note, depending on your directory structure, the autoload file might be somewhere else, but usually this should work.

Answer 2

Pay attention to the use of namespaces: if the Doctrine namespace for its loader is Doctrine\Common\ClassLoader, you have to put the files inside the Doctrine\Common folder ("Doctrine" with a capital "D").
See the code snippet shown inside the Introduction chapter of the Doctrine DBAL documentations.