MySql准备的更新查询失败

Question

这些是我的代码：

$stmt1 = $mysqli->prepare("UPDATE users SET u_lpwd = ? WHERE u_id=? LIMIT 1");
$stmt1->bind_param("si", $pwd, $uid);
$stmt1->execute();
if ($stmt1->affected_rows > 0){
    echo 'password has been updated successfully.';
} else {
    echo 'password update failed.';
} 

看起来查询正在执行，但记录没有更新。这是SQLYog中的报告：

1 queries executed, 1 success, 0 errors, 0 warnings

Query: UPDATE users SET u_lpwd = 'nAJR9d4iVeOTS6D3JiPRVSMXgBRGqTKNo' WHERE u_id= 15 LIMIT 1

0 row(s) affected

Execution Time : 0.153 sec
Transfer Time  : 0 sec
Total Time     : 0.153 sec

Answer 1

可能是白色空间问题

u_id= 15

似乎数据库中没有Entiry