SpringBoot整合Mybatis註解版---update時出現的問題

問題描述：

1、sql建表語句

DROP TABLE IF EXISTS `department`;
CREATE TABLE `department` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `departmentName` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

　　2、Repository層使用註解方式，

　語句如下：

@Update("UPDATE department SET departmentName=#{department.departmentName} WHERE id = #{id}")
 
public Integer updateEmp(Integer id, Department department);　

　　顯示錯誤資訊：

org.apache.ibatis.binding.BindingException: Parameter 'department' not found. Available parameters are [arg1, arg0, param1, param2]

　由錯誤資訊得知，引數發現不了，或者解析不了，可以用 arg1, arg0, param1, param2替換，假如我們不是用POJO物件Department進行傳參，而是使用單個欄位分別進行傳值，那麼結果。
 

@Update("UPDATE department SET departmentName=#{param2} WHERE id = #{param1}")
public Integer updateEmp( Integer id, String departmentName);

　　但是隨著欄位增多，我們使用POJO物件Department進行傳參，需要在傳過來的引數上添加註解，起別名的方式，獲得引數，sql語句中通過物件名.屬性名方式

獲得引數的值，結果也是成功。

　更改後得語句：

controller:
@PostMapping("/dept/{id}")
public Integer updateEmp(@PathVariable("id") Integer id,@Param("departmentName") Department department) {
    
 
return departmentService.updateEmp(id,departmentName);
}
-------------------------
service:
public Integer updateEmp(Integer id,Department department) {   Department dep = new Department(id,department);
   return departmentMapper.updateEmp(id,dep);
}
-------------------------
repository:
@Mapper
public interface DepartmentMapper {
    @Update("UPDATE department SET departmentName=#{department.departmentName} WHERE id = #{id}")
    public Integer updateEmp(@Param("id") Integer id,@Param("department") Department department);
}