如何更新具有 OneToMany 关联的对象的子行

Question

我正在处理一个 Java 项目，但在尝试使用 oneToMany 关联更新对象时遇到了问题，这是我的类：

Team.class

    @Entity
    @Table(name = "TEAM", schema = SchemaRef.NOM_SCHEMA_REF)
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = CacheRegion.CACHE_TEAM)
    public class TEAM extends TeamPrincipal {

        /**
         * long serialVersionUID.
         */
        private static final long serialVersionUID = -7697301560938121726L;

        /** The players . */
        @OneToMany(mappedBy = "tm", cascade = CascadeType.ALL, orphanRemoval = false)
        @Fetch(FetchMode.SUBSELECT)
        @LazyCollection(LazyCollectionOption.FALSE)
        @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = CacheRegion.CACHE_TEAM)
        private Set<Player> listPlayers;

//Getters & Setters

    }

Player.class

@Entity
@Table(name = "PLAYER", schema = SchemaReferentiel.NOM_SCHEMA_REF)
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = CacheRegion.CACHE_TEAM)
public class Player extends DomainObject {

    /**
     * long serialVersionUID.
     */
    private static final long serialVersionUID = -7697301560938121726L;

    /** The id. */
    @Id
    @SequenceGenerator(
                       name = "SequenceIdGenerator",
                       sequenceName = SchemaReferentiel.NOM_SCHEMA_REF + ".SEQUENCE_PLAYER",
                       allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SequenceIdGenerator")
    @Column(name = "PLAYER_ID")
    private long id;

    /** The Player. */
    @ManyToOne
    @JoinColumn(name = "lTeam_Player", referencedColumnName = "id", nullable = false)
    @ForeignKey(name = "C_FK_PlTeam_Player")
    private Team team;

//getters and setter
}

调用DAO方法是TeamDao.java：

sessionFactory.getCurrentSession().saveOrUpdate(toSave);

我在使用此映射时遇到的问题是，当我尝试通过更改玩家列表来更新团队时，它会更新 Team 属性，但 Players 始终是与添加时相同。

创建已正确完成，在调试模式下尝试更新时，团队包含要更新的新玩家列表，在调用 DAO 方法后，父 (TEAM) 已更新，但孩子们（玩家）不是

Answer 1

由于这是一个双向映射，请确保您为一个团队设置了球员，并为每个球员设置了球队：

team.setPlayers(players);

for(Player player: players){
   player.setTeam(team);
}

sessionFactory.getCurrentSession().saveOrUpdate(team);