php - mysqli 显示“未找到结果”

Question

如果没有与查询匹配的行，我想显示“未找到结果”。我试过：

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

和

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

但它们都不起作用。什么是正确的程序？

 $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

试试这个
if($result->num_rows < 1)
而不是
if($stmt->num_rows < 1)

您在结果对象中获得 num_rows

Answer 2

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