注入類@Entitypublic class operationData { @Id @GeneratedValue(strategy=GenerationType.IDENTITY)private Integer ID;private String username;private String password;private Integer age;public operationData() { }public void setusername(String username) { this.username=username;}public void setAge(Integer age) { this.age=age;}public void setpassword(String password) { this.password=password;}public String getusername() { return username;}}借口public interface userInsterface extends JpaRepository<operationData,Integer>{public List<operationData> findByAge(Integer age);}控制器@RestControllerpublic class useroperationhttp { operationData od=new operationData(); @Autowired private userInsterface us;@PostMapping(value="/ca")public operationData PostUser(@RequestParam("password") String pwd,@RequestParam("age") Integer age,@RequestParam("username") String usedata){ System.out.println("----name"+usedata); od.setAge(age); od.setpassword(pwd); od.setusername(usedata); ? return us.save(od); }啟動項目第一次執行的是插入語句，不知為什么發送第二次數據就變為修改了