Hibernate 多个表的一对多映射

Question

@Entity
@Table(name="Visit")
public class Visit {
    @Id
    @XmlTransient
    @JsonIgnore
    @SequenceGenerator(name = "v_id_seq", sequenceName = "v_id_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "v_id_seq")
    @Column(name = "id")
    private Long id;

    @OneToMany(mappedBy = "Visit",cascade = CascadeType.PERSIST,orphanRemoval = true,fetch=FetchType.LAZY)
    private List<directions> directions;

    @OneToMany(mappedBy = "Visit",cascade = CascadeType.PERSIST,orphanRemoval = true,fetch=FetchType.LAZY)
    private List<Test> Test;

@Entity
@Table(name="test")
public class Test {
    @Id
    @XmlTransient
    @JsonIgnore
    @SequenceGenerator(name = "t_id_seq", sequenceName = "t_id_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "t_id_seq")
    @Column(name = "id")
    private Long id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JsonBackReference
    @JoinColumn(name = "vid", updatable = false, insertable = true,referencedColumnName = "id")
    private Visit visit;

@Entity
@Table(name="direction")
public class directions {
    @Id
    @XmlTransient
    @JsonIgnore
    @SequenceGenerator(name = "d_id_seq", sequenceName = "d_id_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "d_id_seq")
    @Column(name = "id")
    private Long id;
    @ManyToOne(fetch = FetchType.LAZY)
    @JsonBackReference
    @JoinColumn(name = "vid", updatable = false, insertable = true,referencedColumnName = "id")
    private Visit Visit;

你好，我是休眠新手我正在尝试映射 OneToMany Visit-->Test and Visit-->direction 但出现错误 Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property:

一次访问可以有多个方向和测试我该如何实施？

请帮助我！

Answer 1

@OneToMany注解中mappedBy字段的值引用java实例变量名，区分大小写。您将其设置为 Visit，但在 directions 和 test 类中，变量名称为 visit.

解决方法是将属性mappedBy由Visit改为visit（小写V）：

@OneToMany(mappedBy = "visit",cascade = CascadeType.PERSIST,orphanRemoval = true,fetch=FetchType.LAZY)
private List<directions> directions;

@OneToMany(mappedBy = "visit",cascade = CascadeType.PERSIST,orphanRemoval = true,fetch=FetchType.LAZY)
private List<Test> Test;

Hibernate 多个表的一对多映射

Hibernate one to many mapping for multiple tables

java

hibernate

hibernate-mapping

maven

spring-boot