您的SQL語法有錯誤;靠近'SET` points` =`points` +？'

Question

我得到這個錯誤，看起來應該很容易找到，但無論我看了多少代碼或谷歌它，我都弄不明白。

下面是代碼

INSERT INTO `users` (`username`) 
    VALUES (?) 
     ON DUPLICATE KEY 
      UPDATE `users` SET `points` = `points` + ? 

的？使用預處理語句後面給定的值，但是對於測試我取而代之的是實際值如下面

INSERT INTO `users` (`username`) 
    VALUES (`existingusername`) 
     ON DUPLICATE KEY 
      UPDATE `users` SET `points` = `points` + 5 

而且我也試過nonextistingusername作爲值。我試着用WHERE爲UPDATE但相信是不需要的，因爲我使用ON DUPLICATE KEY UPDATE

我不明白我要去哪裏錯在這裏

編輯：我也試過圍繞「points支架+ 5"

編輯：進一步代碼

foreach ($users as $user) 
{ 
    $points_query = mysqli_prepare($db, 'INSERT INTO `users` (`username`) 
     VALUES (?) 
      ON DUPLICATE KEY 
       UPDATE `users` SET (`points` = `points` + ?)'); 

    mysqli_stmt_bind_param($points_query, 'si', $user, $user_points); 
    mysqli_stmt_execute($points_query); 

    echo mysqli_error($db) . "\n"; 
} 

和SQL錯誤

You have an error in your SQL syntax; 
check the manual that corresponds to your MySQL 
server version for the right syntax to 
use near 'SET (`points` = `points` + ?)' at line 4 

Answer 1

正確的語法不再使用表名或關鍵字SET。

ON DUPLICATE KEY 
    UPDATE `points` = `points` + ? 

https://dev.mysql.com/doc/refman/5.7/en/insert-on-duplicate.html