laravel 运行migrate报错 1071 Specified key was too long

 转自：https://segmentfault.com/a/1190000008416200

laravel运行命令migrate时报错：

1071 Specified key was too long; max key length is 1000 bytes (S

  QL: alter table `users` add unique `users_email_unique`(`email`))

  [PDOException]

  SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes

     解决：

1. 升级MySql版本到5.5.3以上。

2. 手动配置迁移命令migrate生成的默认字符串长度，App/Providers/AppServiceProvider.php

   <?php

   
   namespace App\Providers;
   
   use Illuminate\Support\ServiceProvider;
   use Illuminate\Support\Facades\Schema;
   
   class AppServiceProvider extends ServiceProvider
   {
       /**
        * Bootstrap any application services.
        *
        * @return void
        */
       public function boot()
       {
           Schema::defaultStringLength(191);
       }