hemall.terabimsoft.com.cn/plugins/business-card/migrations/2019_05_16_150713_add_min_code.php

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class AddMinCode extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        //添加字段
        if (Schema::hasTable('yz_business_card')) {
            if (!Schema::hasColumn('yz_business_card', 'min_code')) {
                Schema::table('yz_business_card', function (Blueprint $table) {
                    $table->string('min_code')->nullable()->comment('小程序名片二维码');
                });
            }
        }
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        //
    }
}