仔细查看报错日志中的sql语句：
### SQL: update smbms_bill set billCode=?, productName=?, productDesc=?, where id=?
没错，在where id = ?之前多了一个 逗号，正确姿势，去删掉接口配置文件中 最后一个if标签的逗号。
（不得不说 log4j日志打印信息真是好用！）
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