为什么'php artisan migrate'命令会创建一个迁移表以及我打算创建的表？

Question

app/migrations/create_user.php

public function up(){
  Schema::create('interns', function($intern){
     $intern->increments('id');
     $intern->string('name');
     $intern->integer('salary');
  });
}

So the above function creates a table called "intern" but along with that it also creates a "migrations" table on running the command "php artisan migrate". Why is it doing this?

Answer 1

It's Laravel's way of keeping track of which migrations have been run.

Let's assume you make another table but it doesn't work right, so you need to run php artisan migrate:rollback. Laravel will know that the second table was created in the second batch and only rollback that one, leaving your interns table alone.

Every time you run another migration, that table will be updated with the migration's file name and the batch it was ran in.