java - 在表之间链接@ManyToOne 时如何创建对象

Question

我有 2 个类 - Person 和 Team。一个人只能在一个团队中，但一个团队可以有很多人(人对象)。问题在于 Person 和 Team 都需要其他类对象来创建它们自己。

类:

@Entity
@Table(name = "Team")
public class Team {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", nullable = false)
    private int id;

    @Column(name = "teamName", nullable = false)
    private String teamName;

    @OneToMany(mappedBy = "myTeam", fetch = FetchType.LAZY)
    private Set <Person> setOfMembers = new HashSet<Person>();

    public Team(int id, String teamName, Set <Person> setOfMembers) {
            //usual code (don't want to waste so much space)
    }
    ... other irrelevant fields ...
}

@Entity
@Table(name = "Person")
public class Person{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID", nullable = false)
    private int id;

    @Column(name = "teamID", nullable = false)
    private int teamID;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "teamID", referencedColumnName = "id")
    private Team myTeam;

    public Person(int id, int teamID, Team myTeam) {
        //usual code
    }
    ... other irrelevant fields ...
}

现在在主文件中，我正在尝试创建一个新对象:

Team t1 = new Team(1,"Nights Watch", <and here i need Person Object, so i 
do something as follows:> new Person(1,1, <and here i need Team object>));

所以它会反复出现，没有尽头。我想向数据库中添加一些记录，但我不知道如何。

实际上我需要一组人物对象，但我仍然不知道如何

Answer 1

为什么在 Team 类的初始化过程中需要所有队友？

只做一个没有 Person 参数的构造函数，然后做一个像这样的方法:

public void addTeamMember(Person person) {
   setOfMembers.add(person);
}

然后，您可以创建Team，创建Person，最后将Person 添加到Team。