Question

我正在研究Java项目，在尝试使用oneToMany关联更新对象时遇到问题，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的方法是 TeamDao.java ：

sessionFactory.getCurrentSession().saveOrUpdate(toSave);

此映射所面临的问题是，当我尝试通过更改球员列表来更新团队时，它会更新 Team （团队）属性，但 Players （参与者）始终是与添加时相同。

创建正确完成，在尝试更新的调试模式下，团队包含要更新的新玩家列表，在调用DAO方法后，父级（ TEAM ）已更新，但孩子（玩家）不是

Answer 1

由于这是双向映射，因此请确保为团队设置了球员，并为每个球员设置了团队：

team.setPlayers(players);

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

sessionFactory.getCurrentSession().saveOrUpdate(team);

如何更新具有OneToMany关联的对象的子行

1 个答案: