php - 推进 ORM : PDOException "Can' t create more than max_prepared_stmt_count statements"

Question

我有大型 MySQL 数据库。我想一次获取 100 行，直到处理完所有数据库。

protected function doEcho($msg){
    static $time, $start;
    if (!$start) $start = time();

    if (time() - $time > 0) {
        echo $msg . "\n\n";
        $time = time();
    }
}

// ZF2 action
public function stuffAction() {
    $request = $this->getRequest();
    if (!$request instanceof ConsoleRequest){
        throw new \RuntimeException('You can only use this action from a console!');
    }

    // Propel ORM generated Model UserQuery
    $q = \UserQuery::create()->limit(100)->filterByProcessed(0);
    $users = $q->find();        

    while ($users->count() ) {
        foreach ($users as $user) {
            $id = $user->getId();
            $email = $user->getEmail();
            $password = $user->getPassword();
            $this->doEcho("$id - $email - $password");
            // do stuff and set processed to 1
        }

        $q = \UserQuery::create()->limit(100)->filterByProcessed(0);
        $users = $q->find();
    }
}

我收到以下异常:

================================================== =======================

应用程序抛出异常!

Propel\Runtime\Exception\PropelException

无法执行 SELECT 语句 [SELECT user.ID, user.EMAIL, user.PASSWORD, user.PHONE, user.IP, user.PROCESSED, user.WHEN FROM user WHERE user.PROCESSED =:p1 限制 100]

//调试回溯

================================================== =======================

之前的异常:

PDO异常

SQLSTATE[42000]:语法错误或访问冲突:1461 无法创建超过 max_prepared_stmt_count 语句(当前值:16382)

//调试回溯

显然，原因是:

An application connecting to the database was preparing sql statements, executing them, then not closing them.

如何让 Propel 关闭语句？我确实使用 Propel 2: "propel/propel": "2.0.*@dev"

Answer 1

已解决:

use Propel\Runtime\Propel;
use Propel\Runtime\Connection\ConnectionWrapper;

// ...

Propel::getServiceContainer()
    // connection_name - connection from propel config
    ->getReadConnection('connection_name')
    ->setAttribute(ConnectionWrapper::PROPEL_ATTR_CACHE_PREPARES, true);