Question

最近我开始玩Exceptions及其处理。一切似乎工作得很好，但我刚刚碰到了一堵砖墙，我不确定是否有解决方案可以解决我的问题，或者我应该重新制作我的代码库。

情况：

我正在try块中执行一小段代码，我正在捕获所有异常，只是记录/输出错误。我正在尝试执行一个从数据库中删除对象的函数：

删除了关系;
删除对象。

我想要完成的是：如果删除对象失败 - 恢复以前删除的关系。

我认为将嵌套的try-catch块放在正在执行最终删除的位置的函数中我会捕获异常并还原更改，但是这在函数内部不起作用而且它只是忽略了try -catch块并进入顶部。 HOWEVER ：当我将相同的代码放在函数之外时，它的工作正常并且与预期的一样！

下面是两段代码 - 工作但不工作。

编辑：我忘了提到我故意在“路由器”DELETE查询中犯了一个语法错误，它总是在“$ status_r = \ sys \ database \ query（$ query， $ db，$ elem_t，$ elem）;“执行。在第一种情况下，它忽略函数“delete”中的try-catch块，并转到调用函数的顶部try-catch块。

不按预期工作

try
{
    $db = \sys\database\connect();
    $status = ips\routers\delete($id, $db);
    echo "success";
    \sys\core\log_action("router_delete", "success", "Router '$id' successfully deleted", $db);
}
catch (Exception $ex)
{
    echo (sys\errors\is_error($ex->getMessage())) ? sys\errors\parse($ex->getMessage()) : $ex->getMessage();
    \sys\core\log_action("router_delete", "failure", $ex->getMessage(), $db);
}

代码：

function delete($id, &$db = false)
{
    // Check if Any Interfaces are set on this router
    if (\ips\interfaces\exists(array("router", $id), $db) !== false)
        throw new \Exception(\sys\errors\exist("Router has active interfaces and cant be removed!"));

    $curr_ip_id = \ips\ips\get(array("router_id", $id), "id", $db);
    if (!\sys\validation\validate("numeric", $curr_ip_id[0]['id']))
        throw new \Exception(\sys\errors\database());

    $status = \ips\ips\revoke($curr_ip_id[0]['id'], NULL, $db);
    if ($status === true)
    {
        // if we get an error we need to revert changes - aka rebind IP to router
        try
        {
            $query = "DELETE FROM routers WHERE i = ?";
            $elem_t = "i";
            $elem = array($id);
            $status_r = \sys\database\query($query, $db, $elem_t, $elem);
            if ($status_r === true)
                return true;
            else
                throw new \Exception();
        }
        catch (Exception $ex)
        {
            $status_rebind = \ips\ips\set_owner(array("id", $curr_ip_id[0]['id']), $id, "router", $db);
            if ($status_rebind === true)
                throw \Exception(\sys\errors\database("Failed Deleting router at the last step. IP reassigned successfully!"));
            else
                throw \Exception(\sys\errors\database("Failed Deleting router at the last step. IP reassigned failed!"));
        }
    }
    else
        throw new \Exception(\sys\errors\database("Failed revoking IP address from router!"));
}

按预期工作

try
{
    $db = \sys\database\connect();

    if (\ips\interfaces\exists(array("router", $id), $db) !== false)
        throw new \Exception(\sys\errors\exist("Router has active interfaces and cant be removed!"));

    $curr_ip_id = \ips\ips\get(array("router_id", $id), "id", $db);
    if (!\sys\validation\validate("numeric", $curr_ip_id[0]['id']))
        throw new \Exception(\sys\errors\database());

    $status = \ips\ips\revoke($curr_ip_id[0]['id'], NULL, $db);
    if ($status === true)
    {
        // if we get an error we need to revert changes - aka rebind IP to router
        try
        {
            $query = "DELETE FROM routers WHERE i = ?";
            $elem_t = "i";
            $elem = array($id);
            $status_r = \sys\database\query($query, $db, $elem_t, $elem);
            if ($status_r === true)
                return true;
            else
                throw new \Exception();
        }
        catch (Exception $ex)
        {
            $status_rebind = \ips\ips\set_owner(array("id", $curr_ip_id[0]['id']), $id, "router", $db);
            if ($status_rebind === true)
                throw new \Exception(\sys\errors\database("Failed Deleting router at the last step. IP reassigned successfully!"));
            else
                throw new \Exception(\sys\errors\database("Failed Deleting router at the last step. IP reassigned failed!"));
        }
    }
    else
        throw new \Exception(\sys\errors\database("Failed revoking IP address from router!"));

}
catch (Exception $ex)
{
    echo (sys\errors\is_error($ex->getMessage())) ? sys\errors\parse($ex->getMessage()) : $ex->getMessage();
    \sys\core\log_action("router_delete", "failure", $ex->getMessage(), $db);
}

我不确定为什么try-catch在函数内部不起作用。任何帮助都将受到高度赞赏。

提前致谢！

PHP：嵌套的try-catch在函数中不起作用

0 个答案: