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我在项目中有一个奇怪的需求。加入两个n:m +属性表(我将用虚拟属性呈现行为)。嵌套n:m +属性JPA
- FirstTable(idPlace,idAddress,idSchool,wage)joined 1:m;
- SecondTable(idPlace,idAddress,idSchool,数量,idEnterprise)
当然,我有表地点,住址,学校,企业与他们各自的在实体类中实现的Ids,获取,集合和属性。
CODE:
广场
@Entity
@Table(name = "Place")
public class Place implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "idLine")
private Long idLine;
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "pk.place")
private List<FirstTable> firstTables;
}
地址
@Entity
@Table(name = "Address")
public class Address implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "idAddress")
private Long idAddress;
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "pk.address")
private List<FirstTable> firstTables;
}
学校
@Entity
@Table(name = "School")
public class School implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "idSchool")
private Long idSchool;
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "pk.school")
private List<FirstTable> firstTables;
}
FirstTable
@Entity
@Table(name = "FirstTable")
@AssociationOverrides({ @AssociationOverride(name = "pk.school", joinColumns = @JoinColumn(name = "idSchool")),
@AssociationOverride(name = "pk.address", joinColumns = @JoinColumn(name = "idAddress")),
@AssociationOverride(name = "pk.place", joinColumns = @JoinColumn(name = "idPlace")) })
public class FirstTable implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
@EmbeddedId
protected FirstTablePK pk = new FirstTablePK();
}
FirstTablePK
@Embeddable
public class FirstTablePK implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
@ManyToOne
private Address address;
@ManyToOne
private Place place;
@ManyToOne
private School school;
}
上面提到的表和联接是完全工作。现在我想加入First Table和Second Table。
企业
@Entity
@Table(name = "Enterprise")
public class Enterprise implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "idEnterprise")
private Long idEnterprise;
@OneToMany(取= FetchType.LAZY,级联= CascadeType.ALL,的mappedBy = “pk.enterprise”) 私人列表secondTables;现在 }
为SecondTable我已经遵循同样的逻辑,其连接到企业。为了与FirstTable连接我试过这样:
@Entity
@Table(name = "SecondTable")
@AssociationOverrides({
@AssociationOverride(name = "pk.firstTable", joinTable = @JoinTable(
name = "FirstTable", inverseJoinColumns = {
@JoinColumn(name = "idSchool", referencedColumnName = "idSchool"),
@JoinColumn(name = "idAddress", referencedColumnName = "idAddress"),
@JoinColumn(name = "idPlace", referencedColumnName = "idPlace") })),
@AssociationOverride(name = "pk.enterprise", joinColumns = @JoinColumn(name = "idEnterprise")) })
public class SecondTable implements Serializable{}
自己是不是在我的注释工作,我试图做一个inverseJoin到FirstTable表。汇编显示此错误:
"org.hibernate.AnnotationException: A component cannot hold properties split into 2 different tables"
我试图提供一个MV示例。 在此先感谢,我真的需要你的帮助。