Spring boot使用save()方法執(zhí)行更新時，沒有指定的字段在數(shù)據(jù)庫顯示為null，什么原因，請指教@PutMapping(value?=?"/stu/{id}")
public?Student?stuUpdate(@PathVariable("id")?Integer?id,
?????????????????????????@RequestParam("name")?String?name,
?????????????????????????@RequestParam("age")?Integer?age)?{
????Student?student?=?new?Student();
????student.setId(id);
????student.setName(name);
????student.setAge(age);
????return?stuRepository.save(student);
}@Id
@GeneratedValue
private?Integer?id;
private?String?name;
private?Integer?age;
private?String?size;
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