How Can I Dynamically Connect to Multiple Databases in Laravel?

Connecting to Databases Dynamically in Laravel

In Laravel applications, it's often necessary to connect to multiple databases for different purposes. However, in scenarios where the target databases are unknown at the time of configuration, traditional approaches such as modifying the database.php file become impractical.

Dynamic Database Connection

To establish a dynamic database connection in Laravel, you can utilize the config() helper function to modify the database configuration at runtime:

Config::set("database.connections.dynamicConnectionName", [
    "host" => "...",
    "database" => "...",
    "username" => "...",
    "password" => "..."
]);

Where "dynamicConnectionName" represents the name of your new database connection.

Eloquent Model Compatibility

Once the dynamic connection is established, Eloquent models that use this connection will automatically reflect the changes. For example, if you have a model named "User" that uses the "dynamicConnectionName" connection:

class User extends Eloquent {
    protected $connection = "dynamicConnectionName";
}

Service Provider Recommendation

It's good practice to define the dynamic connection configuration in a service provider, ensuring it's initialized when the application boots:

<?php

use Illuminate\Support\ServiceProvider;

class DatabaseServiceProvider extends ServiceProvider {
    public function boot() {
        $enabledConnections = config('database.enable_dynamic');

        foreach ($enabledConnections as $connectionName => $config) {
            Config::set("database.connections.$connectionName", $config);
        }
    }
}

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