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新版本的pdo会有这个问题:
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.‘ in。。。
意思是要么使用fetchAll(),要么使用MYSQL_ATTR_USE_BUFFERED_QUERY这个属性,前者不想那样用,因为担心占用内存,后者发现没效果。
$this->db->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);
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原文地址:http://www.cnblogs.com/xitongmaxiazai/p/4228426.html