Backend Database Migrations

When to use this skill

• Database schema changes
• Version control for database
• Deploying schema updates
• Team collaboration

Workflow

• ] Create migration files
• ] Write up() and down()
• ] Run migrations
• ] Track in version control
• ] Never edit existing migrations

Instructions

Create Migration

bash
php spark make:migration add_users_table

Migration File

php
<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class AddUsersTable extends Migration
{
    public function up()
    {
        $this->forge->addField([
            'id' => [
                'type' => 'INT',
                'constraint' => 11,
                'unsigned' => true,
                'auto_increment' => true
            ],
            'email' => [
                'type' => 'VARCHAR',
                'constraint' => 255,
                'unique' => true
            ],
            'created_at' => [
                'type' => 'DATETIME',
                'null' => true
            ]
        ]);
        $this->forge->addKey('id', true);
        $this->forge->createTable('users');
    }

    public function down()
    {
        $this->forge->dropTable('users');
    }
}

Run Migrations

bash
php spark migrate
php spark migrate:rollback

Resources

• Always write down() method
• Test rollback
• Never modify existing migrations