Working with MySQL Cross Join in Laravel 8

When we work with MySQL Queries, then definitely for some relational data we need to work with Joins. Inside this article we will see the concept of Cross Join in Laravel 8.

Joins in Laravel 8 is the connection between one and more tables to get data. In MySQL we have Inner join, Left join, Right join, Cross Join etc.

We will see the concept of Cross Join in this Laravel 8 article.

Learn Laravel 8 relationships –

• One To One
• One To Many
• Many To Many
• Has One Through
• Has Many Through

This article will give you the detailed concept of about implementation of Cross Join in laravel 8.

For this tutorial we will consider a sizes table and a colors table.

Let’s get started.

Types of Joins available in Laravel 8

In Laravel 8 application, as per the documentation we have following types of joins available –

• Inner Join
• Left Join
• Right Join
• Cross Join

What is Cross Join?

Cross Join – Cross joins generate a Cartesian product between the first table and the joined table

How can we use inside an application and get relational data we will see by making an application. Let’s create an application in which we use Cross Join.

Laravel Installation

We will create laravel project using composer. So, please make sure your system should have composer installed. If not, may be this article will help you to Install composer in system.

Here is the command to create a laravel project-

composer create-project --prefer-dist laravel/laravel blog

To start the development server of Laravel –

php artisan serve

URL: http://127.0.0.1:8000

Assuming laravel already installed inside your system.

Create Database & Connect

To create a database, either we can create via Manual tool of PhpMyadmin or by means of a mysql command.

CREATE DATABASE laravel_app;

To connect database with application, Open .env file from application root. Search for DB_ and update your details.

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=laravel_app
DB_USERNAME=root
DB_PASSWORD=root

Create Migrations & Model

Open project into terminal and run this artisan command.

$ php artisan make:model Size -m

It will create two files –

• Model file Size.php at /app/Models folder.
• Migration file 2021_06_15_062204_create_sizes_table.php at /database/migrations folder.

$ php artisan make:migration create_colors_table

It will create a migration file 2021_06_15_062234_create_colors_table.php at /database/migrations folder.

Open 2021_06_15_062204_create_sizes_table.php and write this following code into it.

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateSizesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('sizes', function (Blueprint $table) {
            $table->increments("id");
            $table->string("size", 15);
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('sizes');
    }
}

Open 2021_06_15_062234_create_colors_table.php and write this following code into it.

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateColorsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('colors', function (Blueprint $table) {
            $table->id();
            $table->string("color_name", 50);
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('colors');
    }
}

Migrate Migrations

Back to terminal and run this command to migrate all migrations.

$ php artisan migrate

This command will migrate all.

Insert Test Data For Tables

Here, we have some mysql queries which will insert test data to sizes and colors table.

Copy command and run into SQL tab of mysql database.

--
-- Dumping data for table `sizes`
--

INSERT INTO `sizes` (`id`, `size`) VALUES
(1, 'Small'),
(2, 'Large'),
(3, 'XXL');

--
-- Dumping data for table `colors`
--

INSERT INTO `colors` (`id`, `color_name`) VALUES
(1, 'White'),
(2, 'Black'),
(3, 'Red');

Create Controller

Open project into terminal and run this command.

$ php artisan make:controller SiteController

It will create SiteController.php file at /app/Http/Controllers folder.

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Size;

class SiteController extends Controller
{
    public function getData()
    {
        $data = Size::crossJoin("colors")->get();

        /* Get Last Executed Query */
        // $query = Size::crossJoin("colors")->toSql();

        // echo $query;

        echo "<pre>";
        print_r($data);
    }
}

Cross Join Logic

$data = Size::crossJoin("colors")->get();

Generated Query

select * from `sizes` cross join `colors`

Add Route

Open web.php file from /routes folder.

//...

use App\Http\Controllers\SiteController;

Route::get("cross-join", [SiteController::class, "getData"]);

//...

Application Testing

Run this command into project terminal to start development server,

php artisan serve

URL – http://127.0.0.1:8000/cross-join

You will get your data set at output screen.

Complete Data of cartesian between sizes and colors table.

We hope this article helped you to learn about MySQL Cross Join in Laravel 8 Tutorial in a very detailed way.

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