为什么老师的可以，我的就不可以更新呢？

org.springframework.dao.DuplicateKeyException: 

### Error updating database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '东苑' for key 'UK_AREA'

### The error may involve com.aochuang.dao.AreaDao.updateArea-Inline

### The error occurred while setting parameters

### SQL: UPDATE  tb_area          SET area_name=?,                                                        last_edit_time = ?

### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '东苑' for key 'UK_AREA'

; ]; Duplicate entry '东苑' for key 'UK_AREA'; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '东苑' for key 'UK_AREA'