How to execute Join queries between multiple Databases that are on different server with Laravel Eloquent?

Question

This is how we handle multiple DB Connections with Laravel, which is a PHP Framework not Python (For whom thinks that this is a duplicate post)

<?php
return array(

    'default' => 'mysql',

    'connections' => array(

        # Our primary database connection
        'mysql' => array(
            'driver'    => 'mysql',
            'host'      => 'host1',
            'database'  => 'database1',
            'username'  => 'user1',
            'password'  => 'pass1'
            'charset'   => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix'    => '',
        ),

        # Our secondary database connection
        'mysql2' => array(
            'driver'    => 'mysql',
            'host'      => 'host2',
            'database'  => 'database2',
            'username'  => 'user2',
            'password'  => 'pass2'
            'charset'   => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix'    => '',
        ),
    ),
);

And this is how you connect to this database.

$user1 = User::on('mysql1')->where(/* ... */)->get()
$user2 = User::on('mysql2')->where(/* ... */)->get()

These are only SELECT queries. Therefore Eloquent works flawlessly.

However, when I want to execute a JOIN query operation between these 2 databases, this seems not possible.

Answer 1

If these 2 databases are on different servers, you can't do this. At least not simply. I read about a storage engine. But I have never tried to do this before.

BUT

If there databases are on the same server, you can do it with a simple join, IF the user has the right permission!