在多对一中使用 Spring Data JPA 的错误关系持久性

Question

我有以下代码用于使用 Spring JPA 的多对多或多对一关系持久性。

这是我的存储库测试https://github.com/Truebu/testJpa.git

这个class有3个一对多关系，但是none效果很好

@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classes

@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;

}

实体关系图是这样的：

我的错误是它没有正确检测到这些关系。

当我运行它生成这个：

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

所有三个 classes（KeepRoutine、Statistic 和 Score）都重现此错误，我不知道为什么

Answer 1

您的 OneToMany 映射不合适。您需要使用 routineAssignament 属性名称而不是 table 名称 routine_assignament，如下所示。此属性名称在 ManyToOne 关系中定义。

    @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<>();

在多对一中使用 Spring Data JPA 的错误关系持久性

Error relationship persistence using Spring Data JPA in a many to one

java

mysql

jpa

spring-data

spring-boot