MySQL の PDO::exec で select すると以降のクエリがすべて失敗する - Qiita

<?php $dsn = 'mysql:host=127.0.0.1;dbname=test;charset=utf8'; $pdo = new PDO($dsn, "test", "pass", array( PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, )); $pdo->exec("select 1 from dual"); $pdo->exec("select 2 from dual"); Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. Consider usin