java - 嵌套n:m + JPA属性

我在一个项目中有一个奇怪的需求。连接两个n：m + attributes表（我将使用虚拟属性来呈现行为）。


FirstTable（idPlace，idAddress，idSchool，工资）加入了1：m；
SecondTable（idPlace，idAddress，idSchool，qty，idEnterprise）


编辑（示例架构）：


当然，我有表Place，Address，School，Enterprise，以及在实体类中实现的各自的ID，获取，集合和属性。

码：

地点

@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;
}

第一表

@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();
 }

第一表PK

@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工作正常。现在，我想将FirstTable与Second Table连接起来。

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（提取= FetchType.LAZY，级联= CascadeType.ALL，mappedBy =“ pk.enterprise”）
   私有列表secondTables;
   }

现在，对于SecondTable，我遵循相同的逻辑来连接到Enterprise。为了与FirstTable连接，我尝试了以下方法：

@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{}

我的注释中无法正常工作，我正在尝试对FirstTable表进行inverseJoin。编译显示此错误：

"org.hibernate.AnnotationException: A component cannot hold properties split into 2 different tables"

我试图提供一个MV示例。
在此先感谢您，我真的需要您的帮助。

最佳答案

数小时后，在我设法解决问题之前进行了许多尝试。实际上，解决方案比我最初考虑的要简单得多。

这里是：

 @AssociationOverride(name = "pk.firstTable", joinColumns = {
            @JoinColumn(name = "idSchool"),
            @JoinColumn(name = "idAddress"),
            @JoinColumn(name = "idPlace") }),
    @AssociationOverride(name = "pk.enterprise", joinColumns = @JoinColumn(name = "idEnterprise")) })

关于java - 嵌套n:m + JPA属性，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/40975200/