如果我比较两个 Magento 适配器类 Varien_Db_Adapter_Mysqli 和 Varien_Db_Adapter_Pdo_Mysql 我可以发现方法 raw_query 的查询异常处理有一些差异。

<?php

class Varien_Db_Adapter_Mysqli extends Zend_Db_Adapter_Mysqli
{

//....

/**
 * Run RAW Query
 *
 * @param string $sql
 * @return Zend_Db_Statement_Interface
 */
public function raw_query($sql)
{
    $timeoutMessage = 'SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded;      try restarting transaction';
    $tries = 0;
    do {
        $retry = false;
        try {
            $this->clear_result();
            $result = $this->getConnection()->query($sql);
            $this->clear_result();
        } catch (Exception $e) {
            if ($tries < 10 && $e->getMessage() == $timeoutMessage) {
                $retry = true;
                $tries++;
            } else {
                throw $e;
            }
        }
    } while ($retry);

    return $result;
}

//....

}

如果我将它与 Varien_Db_Adapter_Pdo_Mysql 中的 equal 方法进行比较，我会发现另一个错误处理。它不检查超时，而是检查丢失的连接。

<?php

class Varien_Db_Adapter_Pdo_Mysql  extends Zend_Db_Adapter_Pdo_Mysql implements Varien_Db_Adapter_Interface
{

//....


/**
 * Run RAW Query
 *
 * @param string $sql
 * @return Zend_Db_Statement_Interface
 * @throws PDOException
 */
public function raw_query($sql)
{
    $lostConnectionMessage = 'SQLSTATE[HY000]: General error: 2013 Lost connection to MySQL server during query';
    $tries = 0;
    do {
        $retry = false;
        try {
            $result = $this->query($sql);
        } catch (Exception $e) {
            // Convert to PDOException to maintain backwards compatibility with usage of MySQL adapter
            if ($e instanceof Zend_Db_Statement_Exception) {
                $e = $e->getPrevious();
                if (!($e instanceof PDOException)) {
                    $e = new PDOException($e->getMessage(), $e->getCode());
                }
            }
            // Check to reconnect
            if ($tries < 10 && $e->getMessage() == $lostConnectionMessage) {
                $retry = true;
                $tries++;
            } else {
                throw $e;
            }
        }
    } while ($retry);

    return $result;
}

//....

}

这样对吗？检查两个失败案例不是更好吗？

例子:

/**
 * Run RAW Query
 *
 * @param string $sql
 * @return Zend_Db_Statement_Interface
 * @throws PDOException
 */
public function raw_query($sql)
{
    $lostConnectionMessages = array(
        'SQLSTATE[HY000]: General error: 2013 Lost connection to MySQL server during query',
        'SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction',
    );
    $tries = 0;
    do {
        $retry = false;
        try {
            $result = $this->query($sql);
        } catch (Exception $e) {
            // Convert to PDOException to maintain backwards compatibility with usage of MySQL adapter
            if ($e instanceof Zend_Db_Statement_Exception) {
                $e = $e->getPrevious();
                if (!($e instanceof PDOException)) {
                    $e = new PDOException($e->getMessage(), $e->getCode());
                }
            }
            // Check to reconnect
            if ($tries < 10 && in_array($e->getMessage(), $lostConnectionMessages)) {
                $retry = true;
                $tries++;
            } else {
                throw $e;
            }
        }
    } while ($retry);

    return $result;
}

最佳答案

我会说，是的，他们也应该检查一下。在 Magento2 they removed even the lost-connection reconnect , 但在 MysqlI 适配器中它仍然存在。

关于php - 在 magento 的 pdo_mysql 适配器中缺少 "Lock wait timeout exceeded"处理？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11366048/