<?php

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

class m150722_150000_single_tree extends Migration
{
    public function up()
    {
        $tableOptions = null;
        if ($this->db->driverName === 'mysql') {
            // http://stackoverflow.com/questions/766809/whats-the-difference-between-utf8-general-ci-and-utf8-unicode-ci
            $tableOptions = 'CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE=InnoDB';
        }

        $this->createTable('{{%single_tree}}', [
            'id'    => Schema::TYPE_PK,
            'lft'   => Schema::TYPE_INTEGER . ' NOT NULL',
            'rgt'   => Schema::TYPE_INTEGER . ' NOT NULL',
            'depth' => Schema::TYPE_INTEGER . ' NOT NULL',
        ], $tableOptions);
        $this->createIndex('lft', '{{%single_tree}}', ['lft', 'rgt']);
        $this->createIndex('rgt', '{{%single_tree}}', ['rgt']);
    }
}