How to append connection dynamically in database.php file in laravel

Question

I need to append dynamically connection in the database.php file using PHP code, is it possible or not?

Answer 1

It is working for me When I create a new customer then

public function setConnection($tenantName){
    //GET Database Connection file path
            $path = config_path('database.php');
            //GET Database Connection file 
            $arr = include $path;
            // load the array from the file
            $new_connection=[
                'driver'    => 'mysql',
                'host'      => env('DB_HOST'),
                'database'  => $tenantName,
                'username'  => env('DB_USERNAME'),
                'password'  => env('DB_PASSWORD'),
                'charset'   => 'utf8',
                'collation' => 'utf8_unicode_ci',
                'prefix'    => '',
                'strict' => false
            ];
            // modify the array
            $arr['connections'][$tenantName]=$new_connection;
           // write it back to the file
            file_put_contents($path, "<?php  return " . var_export($arr, true) . ";");
    }

Answer 2

It's possible to have multiple database connections and explicitly execute queries on one of them: https://laravel.com/docs/8.x/database#using-multiple-database-connections

The config/database.php has to return an array where config('database.connections') contains an array with keys representing different database engines but it's totally possible to for example add mysql2 and mysql3 to that array.

For example:

<?php

use Illuminate\Support\Str;

$customConnections = [];
for(var $i = 1; $i < 5; $i++) {
    $customConnections['mysql'.$i] = [
            'driver' => 'mysql',
            'url' => env('DATABASE_URL'),
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '330'.$i),
            'database' => env('DB_DATABASE', 'mysql'.$i),
            'username' => env('DB_USERNAME', 'mysql'.$i),
            'password' => env('DB_PASSWORD', ''),
            'unix_socket' => env('DB_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'prefix_indexes' => true,
            'strict' => true,
            'engine' => null,
            'options' => extension_loaded('pdo_mysql') ? array_filter([
                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
            ]) : [],
        ];
}

return [

    /*
    |--------------------------------------------------------------------------
    | Default Database Connection Name
    |--------------------------------------------------------------------------
    |
    | Here you may specify which of the database connections below you wish
    | to use as your default connection for all database work. Of course
    | you may use many connections at once using the Database library.
    |
    */

    'default' => env('DB_CONNECTION', 'mysql'),

    /*
    |--------------------------------------------------------------------------
    | Database Connections
    |--------------------------------------------------------------------------
    |
    | Here are each of the database connections setup for your application.
    | Of course, examples of configuring each database platform that is
    | supported by Laravel is shown below to make development simple.
    |
    |
    | All database work in Laravel is done through the PHP PDO facilities
    | so make sure you have the driver for your particular database of
    | choice installed on your machine before you begin development.
    |
    */

    'connections' => [
        ...$customConnections,
        'sqlite' => [
            'driver' => 'sqlite',
            'url' => env('DATABASE_URL'),
            'database' => env('DB_DATABASE', database_path('database.sqlite')),
            'prefix' => '',
            'foreign_key_constraints' => env('DB_FOREIGN_KEYS', true),
        ],

        'mongodb' => [
            'driver' => 'mongodb',
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', 27017),
            'database' => env('DB_DATABASE', 'homestead'),
            'username' => env('DB_USERNAME', 'homestead'),
            'password' => env('DB_PASSWORD', 'secret'),
            'options' => [
                // here you can pass more settings to the Mongo Driver Manager
                // see https://www.php.net/manual/en/mongodb-driver-manager.construct.php under "Uri Options" for a list of complete parameters that you can use

                'database' => env('DB_AUTHENTICATION_DATABASE', 'admin'), // required with Mongo 3+
            ],
        ],

        'mysql' => [
            'driver' => 'mysql',
            'url' => env('DATABASE_URL'),
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '3306'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'unix_socket' => env('DB_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'prefix_indexes' => true,
            'strict' => true,
            'engine' => null,
            'options' => extension_loaded('pdo_mysql') ? array_filter([
                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
            ]) : [],
        ],

        'pgsql' => [
            'driver' => 'pgsql',
            'url' => env('DATABASE_URL'),
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '5432'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'charset' => 'utf8',
            'prefix' => '',
            'prefix_indexes' => true,
            'schema' => 'public',
            'sslmode' => 'prefer',
        ],

        'sqlsrv' => [
            'driver' => 'sqlsrv',
            'url' => env('DATABASE_URL'),
            'host' => env('DB_HOST', 'localhost'),
            'port' => env('DB_PORT', '1433'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'charset' => 'utf8',
            'prefix' => '',
            'prefix_indexes' => true,
        ],

    ],

    // ...

];