使用 Spring 數據 JPA 在多對一中的錯誤關系持久性

Question

我有以下代碼用於使用 Spring JPA 的多對多或多對一關系持久性。

這是我的存儲庫測試https://github.com/Truebu/testJpa.git

這個 class 有三個一對多的關系，但沒有一個很好用

@Entity(name = "routine_assignament")
@Table(name = "routine_assignament")
public class RoutineAssignament {

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "id", updatable = false)
    private Long id;

    @Column(name = "date_start",nullable = true,columnDefinition = "DATE")
    private Date date_start = new Date();

    @Column(name = "date_end",nullable = true,columnDefinition = "DATE")
    private Date date_end;

    @ManyToOne
    @JoinColumn(name = "id_user")
    private User user;

    @ManyToOne
    @JoinColumn(name = "id_routine")
    private Routine routine;

    @OneToMany(mappedBy = "routine_assignament")
    private Set<Score> scores = new HashSet<>();

    @OneToMany(mappedBy = "routine_assignament")
    private Set<Statistic> statistics = new HashSet<>();

    @OneToMany(mappedBy = "routine_assignament")
    private Set<KeepRoutine> keepRoutines = new HashSet<>();

其他類

@Entity(name = "score")
@Table(name = "score")
public class Score {

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "id", updatable = false)
    private Long id;

    @Column(name = "commentary",nullable = false,columnDefinition = "TEXT", unique = true)
    private String commentary;

    @Column(name = "assessment",nullable = false,columnDefinition = "INT", unique = true)
    private String assessment;

    @ManyToOne
    @JoinColumn(name = "id_routine_assignament")
    private RoutineAssignament routineAssignament;

}

@Entity(name = "statistic")
@Table(name = "statistic")
public class Statistic {

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "id", updatable = false)
    private Long id;

    @Column(name = "time",nullable = false,columnDefinition = "TEXT", unique = true)
    private String time;

    @ManyToOne
    @JoinColumn(name = "id_routine_assignament")
    private RoutineAssignament routineAssignament;

}

和

@Entity(name = "keep_routine")
@Table(name = "keep_routine")
public class KeepRoutine {

    @Id
    @GeneratedValue(strategy = IDENTITY)
    @Column(name = "id", updatable = false)
    private Long id;

    @ManyToOne
    @JoinColumn(name = "id_routine_assignament")
    private RoutineAssignament routineAssignament;

}

實體關系圖是這樣的：

我的錯誤是它沒有正確檢測到這些關系。

當我運行它時，它會生成：

Failed to initialize JPA EntityManagerFactory: mappedBy reference an unknown target entity property: com.example.demo.model.entities.KeepRoutine.routine_assignament in com.example.demo.model.entities.RoutineAssignament.keepRoutines

這個錯誤在所有三個類（KeepRoutine、Statistic 和 Score）中都出現了，我不知道為什么

Answer 1

您的OneToMany映射不合適。 您需要使用routineAssignament屬性名稱而不是表名routine_assignament ，如下所示。 此屬性名稱在ManyToOne關系中定義。

    @OneToMany(mappedBy = "routineAssignament")
    private Set<Score> scores = new HashSet<>();

    @OneToMany(mappedBy = "routineAssignament")
    private Set<Statistic> statistics = new HashSet<>();

    @OneToMany(mappedBy = "routineAssignament")
    private Set<KeepRoutine> keepRoutines = new HashSet<>();