我想要一双Spring Boot @Query 在jparepository中，它返回带有一组其他实体的实体。我知道我可以用 findAll() 方法，然后只取我感兴趣的那些行，但我认为这要慢得多。问题是我的实体 Booster 包含 Set 其他实体 Boost ，当我尝试查询它时，得到一个错误。所以，这是我的 Query :

@Query( "select new app.model.Booster(" +
            "   B.id, " +
            "   B.active, " +
            "   B.games, " +
            "   B.ownerAccount, " +
            "   B.boosts, " +
            "   B.boosterNickname, " +
            "   B.additionalInformation) " +
            "from " +
            "   Booster B " +
            "   left join Boost Bo on B.id = Bo.boostingAccount.id " +
            "where " +
            "   B.games like %?1% " +
            "   and Bo.finished = true " +
            "group by " +
            "   B.id")
    List<Booster> findBoostersForOverview(String game);

以下是我的实体类：

@Data
@Entity(name = "Booster")
public class Booster {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    private boolean active;
    private String games;
    @OneToOne(mappedBy = "boosterAccount", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private Account ownerAccount;
    @OneToMany(mappedBy = "boostingAccount", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private Set<Boost> boosts;
    private String boosterNickname;
    private String additionalInformation;

@Data
@Entity(name = "Boost")
public class Boost {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="id",nullable=false,unique=true)
    private long id;
    private Date dateCreated;
    private Date dateFinished;
    private Date dateLastModification;
    private boolean finished;
    private boolean paused;
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "boosted_account_id", referencedColumnName = "id")
    private Account boostedAccount;
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "boosting_account_id", referencedColumnName = "id")
    private Booster boostingAccount;
    @OneToMany(mappedBy = "boost", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private Set<Game> games;
    private String game;
    private String additionalInformation;
    private String server;

以下是console显示的内容：

Hibernate: 
    select
        booster0_.id as col_0_0_,
        booster0_.active as col_1_0_,
        booster0_.games as col_2_0_,
        booster0_.id as col_3_0_,
        . as col_4_0_,
        booster0_.booster_nickname as col_5_0_,
        booster0_.additional_information as col_6_0_ 
    from
        booster booster0_ 
    //HERE IS SOME MORE LOGS THAT ARE UNNECESSARY HERE

这是我得到的错误： java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '. as col_4_0_, booster0_.booster_nickname as col_5_0_, booster0_.additional_info' at line 1 我知道我可以不经你的允许 Set 的 Boost ，然后在另一个查询中 Boost s、 但在我的应用程序中会有很多sql，我的代码会变成意大利面条。有什么简单的方法可以解决我的问题吗？