java.sql.SQLException: Unknown system variable ‘email‘ 问题解决

今天在用mybatis 和postman测试后台接口的时候出现以下错误：

### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SET email = ?              where id=?
### Cause: java.sql.SQLException: Unknown system variable 'email'
; uncategorized SQLException; SQL state [HY000]; error code [1193]; Unknown system variable 'email'; nested exception is java.sql.SQLException: Unknown system variable 'email'] with root cause

postman报以下错误：

**错误原因：**对mybatis不熟练，在User.xml文件中的sql语句没写正确
错误示范：

正确示范：