在重复键更新错误

Question

我使用了函数ON DUPLICATE KEY UPDATE。这很奇怪，因为在我的其他代码上，它运行得很好，但有了这个，我仍然可以得到相同的记录。

这是我的存储过程。

IF ((SELECT COUNT(playlist_id) FROM playlists WHERE playlist_id = i_playlistid) > 0)  THEN

   INSERT INTO playlist_terminal (playlist_id,terminal_id,userid,booking_id) VALUES        (i_playlistid,i_terminal_id,i_userid,i_booking_id)
   ON DUPLICATE KEY UPDATE terminal_id = i_terminal_id;

   SELECT terminal.terminal_id,terminal.plate_number,terminal.terminal_status,
   terminal.location, terminal_sum.booking_id FROM terminal
   INNER JOIN playlist_terminal
   ON terminal.terminal_id = playlist_terminal.terminal_id
   INNER JOIN terminal_sum
   ON playlist_terminal.terminal_id = terminal_sum.terminal_id
   WHERE playlist_terminal.userid = i_userid AND playlist_id = i_playlistid;