代码在WIN平台开发一切OK,到测试服务器上.centos,PHP5.3.9 报下面的错误

2012/05/15 20:14:10 [error] [system.db.CDbCommand] CDbCommand::fetchAll() failed: 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… The SQL statement executed was: SHOW COLUMNS FROM lookup_country_codes.

请问 这个问题 如何去处理. 查过大量资料. 在PHP5.2时代有的. 但是.我的环境已经是5.3.9了.