在銷(xiāo)量增加中犯了同樣的錯(cuò)誤，一開(kāi)始就認(rèn)為是sql語(yǔ)句錯(cuò)了，結(jié)果就是這個(gè)逗號(hào)被直接忽略，在service層浪費(fèi)了兩個(gè)半鐘。。。感謝啊，要是沒(méi)你的提示還不知道要搞多久。

解決了，原來(lái)是沒(méi)有刪除

set?stock?=?stock?-?#{amount}，

這的逗號(hào)

### Error updating database.? Cause: java.sql.SQLSyntaxErrorException: 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 'where item_id = 5 and stock >= 1' at line 3

### The error may involve defaultParameterMap

### The error occurred while setting parameters

### SQL: update item_stock? ? ?set stock = stock - 1,? ? ?where item_id = 5 and stock >= 1

### Cause: java.sql.SQLSyntaxErrorException: 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 'where item_id = 5 and stock >= 1' at line 3

; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: 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 'where item_id = 5 and stock >= 1' at line 3]