PHP mysqli - 从准备好的语句返回关联数组

Question

我正在尝试使用 mysqli 来准备一个语句，以便安全地将变量值传递给查询。所有这些都对我有用，但我遇到的问题是将结果放入关联数组中。 到目前为止，这是我的结构：

$query = $c->stmt_init();
$query->prepare("SELECT e._id,e.description,e.eventDate,e.eventTime,e.address,e.locationDescription,i.guestId,r.guestId IS NOT NULL AS 'RSVP-ed'  FROM eventList AS e  JOIN inviteList AS i ON e._id = i.eventId LEFT JOIN rsvpList AS r ON r.eventId = e._id AND i.guestId = r.guestId JOIN guestList AS g ON g._id = i.guestId WHERE g.groupName = ?");
$query->bind_param('s',$groupName);
if ($result = $query->execute()){
    $a  = $result->fetch_array(MYSQLI_ASSOC); // this doesn't work :/
} else{
    error_log ("Didn't work");
}

如您所见，我有很多列被传回，所以我不想将它们每一个绑定到一个变量。

最重要的是，最终目标是将一个 json 编码的关联数组传回我的应用程序的其余部分。

我在 php 文档和堆栈交换中查找了该问题，并找到了建议，但我似乎无法让它们正常工作。有人可以帮忙吗？？

Answer 1

如果你有 MySql Native Driver 扩展（mysqlnd），你可以使用get_result 方法获取一个ResultSet，然后按照通常的方式从中获取：

$query = $c->prepare("SELECT e._id,e.description,e.eventDate,e.eventTime,e.address,e.locationDescription,i.guestId,r.guestId IS NOT NULL AS 'RSVP-ed'  FROM eventList AS e  JOIN inviteList AS i ON e._id = i.eventId LEFT JOIN rsvpList AS r ON r.eventId = e._id AND i.guestId = r.guestId JOIN guestList AS g ON g._id = i.guestId WHERE g.groupName = ?");
$query->bind_param('s',$groupName);
$query->execute();
$result = $query->get_result();
$a  = $result->fetch_array(MYSQLI_ASSOC); // this does work :)