[英]get_result()->fetch_assoc() returns 0 even thought num rows is 2
I have a function that accesses the database to get a message based on the recipients UserID. 我有一个函数,可以访问数据库以根据收件人的UserID获取消息。
function GetUnreadMessages($recipientID, $db) {
$sql = 'SELECT
senderID AND headline AND message
FROM
Message
WHERE
recipientID = ? AND unread = 1
LIMIT 100';
$stmt = $db->prepare($sql);
if ($stmt) {
$stmt->bind_param('i', $recipientID);
$stmt->execute();
return $stmt->get_result();
}
else {
http_redirect("", array(
section => "info",
message => "Internal error while recieving messages!"
));
}
}
Then I call this. 然后我称之为。
$messageCount
is 2 like it should be because there are two messages for my testuser. $messageCount
是2,就像应该这样,因为我的testuser有两条消息。
$messages = GetUnreadMessages($userID, $db);
$messageCount = $messages->num_rows; // 2
But when I call this $messages
is always 0. Any idea why? 但是,当我称此
$messages
始终为0时,为什么?
$message = $messages->fetch_array(MYSQL_ASSOC); // 0
你有独立的领域,
不AND
。
SELECT senderID, headline, message
This gives you the logical AND of the values as one result: 这使您可以将值的逻辑与作为一个结果:
select senderID AND headline AND message
You want this: 你要这个:
select senderID, headline, message
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