MySQL的条件重复密钥更新

Question

我正在尝试使用单个mysqli查询实现更新乘法行。到目前为止我所做的是：

 $sql="INSERT INTO history_table (image_canvas_channel, start_image_time, end_image_time) VALUES ($image_canvas_channel , $start_image_time, $end_image_time) ON DUPLICATE KEY UPDATE start_image_time = IF(image_canvas_channel = $image_canvas_channel, start_image_time = $start_image_time,) , end_image_time = IF(image_canvas_channel = $image_canvas_channel, end_image_time = $end_image_time,)";

  

您的SQL语法有错误;查看与您的MySQL服务器版本对应的手册，以便在第1行附近使用正确的语法，end_image_time = IF（image_canvas_channel = 152，end_image_time = 363365，）'。