今更ですが、PHPでPDOを使ってみた。そしたらエラーが
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. . . . 本文を読む
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