PDO Mysql不正确返回结果

Question

嗨,我坚持这个非常奇怪的情况.

我是一个mysql服务器和一个应用服务器.应用程序通过专用网络连接到mysql,我授予.两个用户的权限.

这是来自app server的代码.

$db2 = new PDO('mysql:host=' . $host . ';dbname=' .$database. ';charset=utf8mb4', $userid, $db_password);
$db2->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db2->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);


$somequery = $db2->query('SELECT mail,message_id from mc_mails');
$somequery->execute();

$somedata = $somequery->fetchAll(\PDO::FETCH_ASSOC);

pretty_print($somedata); //my own <pre>print_r()</pre> function

var_dump($somedata); //shows raw dump


//so below i try to do again in a try loop to get Exception, and there's no exception.
try {
    $somequery->execute();

    while ($row = $somequery->fetch(PDO::FETCH_ORI_NEXT)) {
        pretty_print($row);
    }

} catch (PDOException $e) {
    echo $e->getMessage();
}

以上结果给出了以下结果

    **This is from pretty_print() **
Array
(
    [0] => Array
        (
            [mail] => 20
            [message_id] => <2061A721-82BE-48EC-BA44-D2CD6D6DAC00@gmail.com>
        )

    [1] => Array
        (
            [mail] => 21
            [message_id] => <8064AD4C-7C30-499B-8D83-E7DBABADCF36@gmail.com>
        )

    [2] => Array
        (
            [mail] => 22
            [message_id] => 
        )

    [3] => Array
        (
            [mail] => 23
            [message_id] => 
        )

    [4] => Array
        (
            [mail] => 24
            [message_id] => 
        )

    [5] => Array
        (
            [mail] => 25
            [message_id] => 
        )

    [6] => Array
        (
            [mail] => 26
            [message_id] => 
        )

    [7] => Array
        (
            [mail] => 27
            [message_id] => <850E2143-F797-4B6B-8F29-1004EEBCC0D2@gmail.com>
        )

    [8] => Array
        (
            [mail] => 28
            [message_id] => 
        )

    [9] => Array
        (
            [mail] => 29
            [message_id] => 
        )

    [10] => Array
        (
            [mail] => 30
            [message_id] => <59DED427-255B-45EB-AC10-172FD49D529D@gmail.com>
        )

    [11] => Array
        (
            [mail] => 31
            [message_id] => <50360840-52AD-44FE-9257-B51610F36171@gmail.com>
        )

    [12] => Array
        (
            [mail] => 34
            [message_id] => 
        )

    [13] => Array
        (
            [mail] => 35
            [message_id] => 
        )

)

** This is from var_dump() **
array(14) { [0]=> array(2) { ["mail"]=> int(20) ["message_id"]=> string(48) "<2061A721-82BE-48EC-BA44-D2CD6D6DAC00@gmail.com>" } [1]=> array(2) { ["mail"]=> int(21) ["message_id"]=> string(48) "<8064AD4C-7C30-499B-8D83-E7DBABADCF36@gmail.com>" } [2]=> array(2) { ["mail"]=> int(22) ["message_id"]=> string(48) "" } [3]=> array(2) { ["mail"]=> int(23) ["message_id"]=> string(48) "" } [4]=> array(2) { ["mail"]=> int(24) ["message_id"]=> string(48) "" } [5]=> array(2) { ["mail"]=> int(25) ["message_id"]=> string(48) "" } [6]=> array(2) { ["mail"]=> int(26) ["message_id"]=> string(48) "" } [7]=> array(2) { ["mail"]=> int(27) ["message_id"]=> string(48) "<850E2143-F797-4B6B-8F29-1004EEBCC0D2@gmail.com>" } [8]=> array(2) { ["mail"]=> int(28) ["message_id"]=> string(48) "" } [9]=> array(2) { ["mail"]=> int(29) ["message_id"]=> string(48) "" } [10]=> array(2) { ["mail"]=> int(30) ["message_id"]=> string(48) "<59DED427-255B-45EB-AC10-172FD49D529D@gmail.com>" } [11]=> array(2) { ["mail"]=> int(31) ["message_id"]=> string(48) "<50360840-52AD-44FE-9257-B51610F36171@gmail.com>" } [12]=> array(2) { ["mail"]=> int(34) ["message_id"]=> string(48) "" } [13]=> array(2) { ["mail"]=> int(35) ["message_id"]=> string(48) "" } }


** This is from fetch loop**
Array
(
    [mail] => 20
    [0] => 20
    [message_id] => <2061A721-82BE-48EC-BA44-D2CD6D6DAC00@gmail.com>
    [1] => <2061A721-82BE-48EC-BA44-D2CD6D6DAC00@gmail.com>
)
Array
(
    [mail] => 21
    [0] => 21
    [message_id] => <8064AD4C-7C30-499B-8D83-E7DBABADCF36@gmail.com>
    [1] => <8064AD4C-7C30-499B-8D83-E7DBABADCF36@gmail.com>
)
Array
(
    [mail] => 22
    [0] => 22
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 23
    [0] => 23
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 24
    [0] => 24
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 25
    [0] => 25
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 26
    [0] => 26
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 27
    [0] => 27
    [message_id] => <850E2143-F797-4B6B-8F29-1004EEBCC0D2@gmail.com>
    [1] => <850E2143-F797-4B6B-8F29-1004EEBCC0D2@gmail.com>
)
Array
(
    [mail] => 28
    [0] => 28
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 29
    [0] => 29
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 30
    [0] => 30
    [message_id] => <59DED427-255B-45EB-AC10-172FD49D529D@gmail.com>
    [1] => <59DED427-255B-45EB-AC10-172FD49D529D@gmail.com>
)
Array
(
    [mail] => 31
    [0] => 31
    [message_id] => <50360840-52AD-44FE-9257-B51610F36171@gmail.com>
    [1] => <50360840-52AD-44FE-9257-B51610F36171@gmail.com>
)
Array
(
    [mail] => 34
    [0] => 34
    [message_id] => 
    [1] => 
)
Array
(
    [mail] => 35
    [0] => 35
    [message_id] => 
    [1] => 
)

我不知道为什么有些数组是空的.请注意,var_dump结果显示其字符串为48,但它仍然为空.

循环还显示数组中的某些内容,但它永远不会被打印出来.但是,我在ssh中直接使用的完全相同的查询给出了以下内容.所有字段都已设置.

我不知道这是否是问题,但我的MESSAGE_ID为varchar(1000) - 是的,它是非常大的,但我刚开始学习有关电子邮件标题和我读RFC是邮件ID约1000个字符,虽然我对此表示怀疑永远过去.

需要帮助.我放养了.

编辑:这也发生在许多领域,我只是为了清晰起见选择一个字段.

Answer 1

您正在转储到浏览器中,并且这些消息ID已经存在<>,这意味着它们将被呈现为未知/非法的html标记.做一个页面的视图源,你会看到它们在那里

我猜测显示的前两个是编码的<...>,因此它们显示为文本,而不是呈现为html.