Php 创建不使用PDO的事件语句？

我似乎一辈子都不明白为什么这个CREATE-EVENT语句不起作用。我可以从CLI将其等效项直接放入MariaDB中，但由于某些原因，此项不起作用

echo "unspaced, nexttime, ident, ttime<br />";

var_dump ($unspaced, $nexttime, $ident, $ttime);
echo "<br />";

$neweventstatement = $loginconn->prepare("CREATE EVENT :eventname ON SCHEDULE AT CURRENT_TIMESTAMP + :nexttime SECOND DO BEGIN UPDATE `tasks` SET ended = NULL WHERE id = :id AND created = :tasktime; END");
$neweventstatement->bindParam(':eventname', $unspaced, PDO::PARAM_STR);
$neweventstatement->bindParam(':nexttime', $nexttime, PDO::PARAM_INT);
$neweventstatement->bindParam(':id', $ident, PDO::PARAM_INT);
$neweventstatement->bindParam(':tasktime', $ttime, PDO::PARAM_STR);
$neweventstatement->execute();

我也尝试过一些明显的变体，比如

CREATE EVENT :eventname ON SCHEDULE AT CURRENT_TIMESTAMP + :nexttime SECONDS DO BEGIN UPDATE `tasks` SET ended = NULL WHERE id = :id AND created = :tasktime; END
CREATE EVENT :eventname ON SCHEDULE AT CURRENT_TIMESTAMP + :nexttime SECOND DO UPDATE `tasks` SET ended = NULL WHERE id = :id AND created = :tasktime;
CREATE EVENT :eventname ON SCHEDULE AT CURRENT_TIMESTAMP + :nexttime SECOND DO BEGIN UPDATE `tasks` SET ended = NULL WHERE id = :id AND created = :tasktime; END
DELIMITER ^^ CREATE EVENT :eventname ON SCHEDULE AT CURRENT_TIMESTAMP + :nexttime SECOND DO BEGIN UPDATE `tasks` SET ended = NULL WHERE id = :id AND created = :tasktime; END ^^

但似乎一切都不起作用

我觉得我错过了一些明显的东西，但我看不见

编辑：出于某种原因，一个卑鄙的人将此标记为“为什么我准备的语句不能使用表名”的副本，但事实并非如此。我对它进行了编辑，以明确问题是什么。如下所述，问题在于CREATE EVENT不能是预处理语句。

mysql手册中的部分包含您在预处理语句中使用的SQL语句列表<代码>创建事件语句不包括在此列表中，因此不能将其用作准备好的语句

---

您必须通过字符串连接创建sql语句并执行它。您必须添加进一步的检查，以确保这不会导致sql注入漏洞。

您在cli中尝试过这一点吗？这是我在mysql 5.7.30中得到的信息<代码>#1295-此命令在准备好的语句协议中还不受支持Well。。。废话。这就是我害怕的。关于StackOverflow还有几个关于预处理语句和创建事件的问题，但没有一个答案提到它不兼容的事实，所以我想“如果它不兼容，有人会提到它……对吧？”无论如何，这实际上非常有用，尽管我很失望。谢谢

CREATE EVENT :eventname ON SCHEDULE AT CURRENT_TIMESTAMP + :nexttime SECONDS DO BEGIN UPDATE `tasks` SET ended = NULL WHERE id = :id AND created = :tasktime; END
CREATE EVENT :eventname ON SCHEDULE AT CURRENT_TIMESTAMP + :nexttime SECOND DO UPDATE `tasks` SET ended = NULL WHERE id = :id AND created = :tasktime;
CREATE EVENT :eventname ON SCHEDULE AT CURRENT_TIMESTAMP + :nexttime SECOND DO BEGIN UPDATE `tasks` SET ended = NULL WHERE id = :id AND created = :tasktime; END
DELIMITER ^^ CREATE EVENT :eventname ON SCHEDULE AT CURRENT_TIMESTAMP + :nexttime SECOND DO BEGIN UPDATE `tasks` SET ended = NULL WHERE id = :id AND created = :tasktime; END ^^