What is Migration in Laravel:

Let's Understand this better.

After Installing Laravel , let's understand migration.

Create a migration and understand the structure:

To generate a migration you need run a command.

php artisan make:migration create_posts_table --create=posts

this will generate a contacts table file in database\migrations folder.

The file consist of new class extending the migration class of LARAVEL.

The new class consist of 2 major function up() & down(). The up() function holds all information about migrating the file.

public function up()
{
    Schema::create('contacts', function (Blueprint $table) 
    {
            $table->id();
            $table->string('name');
            $table->string('mobile_no');
            $table->boolean('status');
            $table->timestamps();
    });
}

whereas down() function holds information about reversing the migration action.

public function down()
{
    Schema::dropIfExists('contacts');
}

Run & Rollback The Migration:

To run a migration we need to use the command.

php artisan migrate

For rolling back latest migration we have command.

php artisan migrate:rollback

when we have to rollback till specific steps we can pass steps in rollback command like.

php artisan migrate:rollback --step (this command will delete the latest migration migrations)

php artisan migrate:rollback --step=2 (this command will delete 2 migrations)

this will rollback the migration upto 3 step starting from latest.

if you want to check that if a new migration is created and not add in the database.

php artisan migrate:status

if you want to add a column in a existing table using migration.

php artisan make:migration add_email_column_in_contact_table --table=contacts

if you want to delete all the database.

php artisan migrate:reset

if you want to refresh all the database.

php artisan migrate:refresh

if you want to delete a specific migration file.

php artisan migrate:rollback --path=database\migrations\file_name