Hi Dev,

Are you looking to multiple database connection in laravel 9? Sometimes, you may come across a situation where you need to deal with more than one database. In this article, we study multiple database connection in laravel 9 application.you can understand the concept of laravel 9 multiple database connections .env. you will do the following things for multiple database connection in laravel 9.

In this article, we will discuss the “How to use Multiple Database Connections in Laravel 9”. In some conditions, we need to connect multiple databases to the Laravel application.

We need to use multiple database connections like MySQL, MongoDB, etc. I can say when you work with a large number of projects then you will need maybe. So let's follow bellow steps.

Let us begin the tutorial by installing a new laravel application. if you have already created the project, then skip following step.

composer create-project laravel/laravel example-app

Here, you need to set configuration variable on .env file. let's create as bellow:

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=mydatabase
DB_USERNAME=root
DB_PASSWORD=root
   
DB_CONNECTION_SECOND=mysql
DB_HOST_SECOND=127.0.0.1
DB_PORT_SECOND=3306
DB_DATABASE_SECOND=mydatabase2
DB_USERNAME_SECOND=root
DB_PASSWORD_SECOND=root

Now, as we created variable in env file, we need to use that variable on config file so let's open database.php file and add new connections key as like bellow:

<?php
  
use Illuminate\Support\Str;
  
return [ 
    'default' => env('DB_CONNECTION', 'mysql'),
    'connections' => [
        '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'),
            ]) : [],
        ],
        'mysql_second' => [
            'driver' => 'mysql',
            'url' => env('DATABASE_URL_SECOND'),
            'host' => env('DB_HOST_SECOND', '127.0.0.1'),
            'port' => env('DB_PORT_SECOND', '3306'),
            'database' => env('DB_DATABASE_SECOND', 'forge'),
            'username' => env('DB_USERNAME_SECOND', 'forge'),
            'password' => env('DB_PASSWORD_SECOND', ''),
            'unix_socket' => env('DB_SOCKET_SECOND', ''),
            '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'),
            ]) : [],
        ],
.....

I will give write two routes with getting products from different database connections. you can see simple example with DB.

let's add two routes in your file:

<?php
  
use Illuminate\Support\Facades\Route;
  
/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/
  
/*------------------------------------------
--------------------------------------------
Getting Records of Mysql Database Connections
--------------------------------------------
--------------------------------------------*/
Route::get('/get-mysql-products', function () {
    $products = DB::table("products")->get();
      
    dd($products);
});
  
/*------------------------------------------
--------------------------------------------
Getting Records of Mysql Second Database Connections
--------------------------------------------
--------------------------------------------*/
Route::get('/get-mysql-second-products', function () {
    $products = DB::connection('mysql_second')->table("products")->get();
      
    dd($products);
});

you can create separate migrations for multiple database connections:

<?php

public function up()
{
    Schema::create('blog', function (Blueprint $table) {
        $table->increments('id');
        $table->string('title');
        $table->string('body')->nullable();
        $table->timestamps();
    });
}

<?php

public function up()
{
    Schema::connection('mysql_second')->create('blog', function (Blueprint $table) {
        $table->increments('id');
        $table->string('title');
        $table->string('body')->nullable();
        $table->timestamps();
    });
}

<?php
  
namespace App\Models;
  
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
  
class Product extends Model
{
    use HasFactory;
   
    protected $fillable = [
        'name', 'detail'
    ];
}

<?php
  
namespace App\Models;
  
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
  
class Product extends Model
{
    use HasFactory;
  
    protected $connection = 'mysql_second';
  
    protected $fillable = [
        'name', 'detail'
    ];
}

<?php
  
use App\Models\Product;
    
class ProductController extends BaseController
{
    /**
     * Write code on Method
     *
     * @return response()
     */
    public function getRecord()
    {
        $products = Product::get();
        return $products;
    }
}

<?php

use App\Models\Product;
  
class ProductController extends BaseController
{
    /**
     * Write code on Method
     *
     * @return response()
     */
    public function getRecord()
    {
        $product = new Product;
        $product->setConnection('mysql_second');
        $something = $product->find(1);
        return $something;
    }
}

I hope it can help you...