如:
class Person{
@Id
@GeneratedValue(strategy = GenerationType.AUTO, generator = "uuid-hex")
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}
當更新時,如果這樣寫就會出錯:
Person p = new Person();
p.setId(id);
Person p = entityManager.get(Person.class, id);
//更新p的信息
entityManager.update(p);