mysqli show「找不到結果」

Question

如果沒有與查詢匹配的行，我想顯示「找不到結果」。 我我曾嘗試：

if(!$result) {echo"no results found";} 

和

if($stmt->num_rows < 1) {echo"no results found"} 

但他們沒有工作。什麼是正確的程序？

$stmt = $mydb->prepare("SELECT * FROM messages where from_user = ? and deleted = 'yes' or to_user = ? and deleted = 'yes'"); 
$stmt->bind_param('ss', $username->username, $username->username); 
$stmt->execute(); 
$result = $stmt->get_result(); 

while ($row = $result->fetch_assoc()) { 
echo $row['message'];} 

Answer 1

嘗試此相反的
if($result->num_rows < 1)

if($stmt->num_rows < 1)

您在結果對象得到NUM_ROWS

Answer 2

<?php if($stmt->num_rows != 0) { 
while ($row = $result->fetch_assoc()) { 
echo $row['message'];} 
} else {echo"no results found";} ?>