laravel（二）migration leverage ratio gearing ratio pe rati

Migation in laravel is similar to a kind of data version control.
1. Create database
(1) Create a database based on the database php file

php artisan migrate

(2) If you find a creation error, you can undo

php artisan migrate:rollback

(3) Create in lar A php file used to create a database

php artisan make:migration create_articles_table --create=articles //where articles specifies the table name

(4) Add fields

php artisan make:migration add_intro_column_to_articles - -table=articles
//Need to write in the newly created php file,
In the up() function:
$table->string('xxx');
In the down() function:
$table->dropColumn('xxx')
Note: dropColumn requires import package: doctrine/dbal

2.Update after database change

php artisan migrate:refresh

3.apache2 startup

sudo /etc/init.d/apache2 restart

The above introduces laravel (2) migration, including laravel and ratio content. I hope it will be helpful to friends who are interested in PHP tutorials.