Souke/console/migrations/m161113_155900_systeme_paiement.php

<?php

use yii\db\Schema;
use yii\db\Migration;

class m161113_155900_systeme_paiement extends Migration
{
    public function up()
    {
        $this->addColumn('etablissement', 'date_creation', Schema::TYPE_DATETIME.' NOT NULL DEFAULT CURRENT_TIMESTAMP') ;
        $this->addColumn('etablissement', 'date_paiement', Schema::TYPE_DATETIME) ;
        $this->addColumn('etablissement', 'gratuit', Schema::TYPE_BOOLEAN.' DEFAULT 0') ;
    }

    public function down()
    {
        $this->dropColumn('etablissement', 'date_creation') ;
        $this->dropColumn('etablissement', 'date_paiement') ;
        $this->dropColumn('etablissement', 'gratuit') ;
    }

    /*
    // Use safeUp/safeDown to run migration code within a transaction
    public function safeUp()
    {
    }

    public function safeDown()
    {
    }
    */
}