このエラーが発生します:
Error: SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered
queries are active. Consider using PDOStatement::fetchAll(). Alternatively, if your code
is only ever going to run against mysql, you may enable query buffering by setting the
PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute.
このPDO::MYSQL_ATTR_USE_BUFFERED_QUERY属性をどのように設定しますか?