PDO报错:Cannot execute queries while other unbuffered queries are active.

错误信息:

Cannot execute queries while other unbuffered queries are active.  Consider using PDOStatement::fetchAll().  Alternatively, if your code is only ever going to run agains
t mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute.

也就是说，未结束之前的查询而再次查询，这样是会出错地，所以要释放掉之前的查询。

解决方法:

$configs = $this->config;
// 解决方法就是增加这句
$configs['params'][constant('PDO::MYSQL_ATTR_USE_BUFFERED_QUERY')] = true;
if ($this->pconnect) {
$configs ['params'] [constant ( 'PDO::ATTR_PERSISTENT' )] = true;
}
try {
$this->link = new PDO ( $configs ['dsn'], $configs ['username'], $configs ['password'], $configs ['params'] );
} catch ( PDOException $e ) {
throw new exception ( $e->getMessage () );
//exit('连接失败:'.$e->getMessage());
}

最后

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