在一个新的laravel安装，运行代客，应用程序的工作良好。
问题是试图使用mysql建立一个数据库。我可以创建一个数据库，告诉mysql使用它，但不能用它做任何事情：

mysql> create database foobar;
Query OK, 1 row affected (0.09 sec)

mysql> use foobar;
Database changed

mysql> show tables;
ERROR 1449 (HY000): The user specified as a definer ('mysql.infoschema'@'localhost') does not exist

如果我尝试 php artisan migrate 我得到以下信息：

PDOException  : SQLSTATE[HY000] [2006] MySQL server has gone away

  at /Users/isaacfennell/Sites/anything/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:68
    64|         if (class_exists(PDOConnection::class) && ! $this->isPersistentConnection($options)) {
    65|             return new PDOConnection($dsn, $username, $password, $options);
    66|         }
    67|
  > 68|         return new PDO($dsn, $username, $password, $options);
    69|     }
    70|
    71|     /**
    72|      * Determine if the connection is persistent.

  Exception trace:

  1   PDO::__construct("mysql:host=127.0.0.1;port=3306;dbname=anything", "root", "", [])
      /Users/isaacfennell/Sites/anything/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:68

  2   Illuminate\Database\Connectors\Connector::createPdoConnection("mysql:host=127.0.0.1;port=3306;dbname=anything", "root", "", [])
      /Users/isaacfennell/Sites/anything/vendor/laravel/framework/src/Illuminate/Database/Connectors/Connector.php:98

  Please use the argument -v to see more details.

我对laravel和mysql还不熟悉，不知道如何解决这个问题-这是怎么回事？谢谢