[英]Hibernate inheritance single table
我正在嘗試使用數據庫表“ persons”實現單個表的Hibernate繼承策略。
我有一個家庭,其中有丈夫,妻子,孩子清單和其他囚犯清單。 每個人可能是許多家庭的成員(即丈夫可能是一個家庭的丈夫,而另一個家庭的孩子)。
@Entity
@Table(name = "families")
public class Family extends BaseObject {
private Parent husband;
private Parent wife;
private String surname;
private List<Child> children = new ArrayList<Child>();
private List<Other> others = new ArrayList<Other>();
@ManyToOne(optional = true, cascade = CascadeType.ALL)
@JoinColumn(name = "husband_id", nullable = true)
public Parent getHusband() {
return husband;
}
@ManyToOne(optional = true, cascade = CascadeType.ALL)
@JoinColumn(name = "wife_id", nullable = true)
public Parent getWife() {
return wife;
}
@LazyCollection(LazyCollectionOption.TRUE)
@ManyToMany(cascade=CascadeType.ALL)
@JoinTable(name="persons_families", joinColumns=@JoinColumn(name="family_id"), inverseJoinColumns=@JoinColumn(name="person_id"))
public List<Other> getOthers() {
return others;
}
@LazyCollection(LazyCollectionOption.TRUE)
@ManyToMany(cascade=CascadeType.ALL)
@JoinTable(name="persons_families", joinColumns=@JoinColumn(name="family_id"), inverseJoinColumns=@JoinColumn(name="person_id"))
public List<Child> getChildren() {
return children;
}
人是所有人的共同階級:
@Entity
@Table(name = "persons")
@DiscriminatorColumn(name = "type")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public class Person extends BaseObject {
private List<Family> families;
@ManyToMany(cascade=CascadeType.ALL)
@ManyToMany(cascade=CascadeType.ALL)
@JoinTable(name="persons_families", joinColumns=@JoinColumn(name="person_id"), inverseJoinColumns=@JoinColumn(name="family_id"))
public List<Family> getFamilies() {
return families;
}
子類,其他類和父類是相同的:
@Entity
@Table(name = "persons")
@DiscriminatorValue(value = "children")
public class Child extends Person {}
@Entity
@Table(name = "persons")
@DiscriminatorValue(value = "others")
public class Other extends Person {}
@Entity
@Table(name = "persons")
@DiscriminatorValue(value = "parents")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public class Parent extends Person {}
現在,在系統啟動期間,我遇到以下問題:
org.hibernate.MappingException: Repeated column in mapping for entity: org.parafia.model.Other column: type (should be mapped with insert="false" update="false")
我該怎么辦? 我的模型有意義嗎?
最好的祝福
我的模型有意義嗎?
它沒有:如果你的目標是,比如說,愛麗絲是一些家庭的母親,並在其他一些孩子,又該type
愛麗絲行的persons
呢? 愛麗絲應該是Parent
還是Child
的實例?
子類必須是分離集。
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