多级层次结构的 Hibernate 混合继承策略

Question

我有以下 class 结构：

我想用 hibernate 生成以下三个表：

PlanItem：及其所有属性
任务：及其所有属性及其子属性
阶段：具有所有属性

我尝试混合继承类型，但没有成功：

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public abstract class PlanItem {...}

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public class Stage extends PlanItem {...}

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public class Task extends PlanItem {...}

@Entity
public class HumanTask extends Task {...}

@Entity
public class ProcessTask extends Task {...}

@Entity
public class CaseTask extends Task {...}

我已经尝试过辅助表并或多或少得到了想要的结果：

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public abstract class PlanItem {...}

@Entity
@SecondaryTable( name = "Stage" )
public class Stage extends PlanItem {...}

@Entity
@SecondaryTable( name = "Task" )
public class Task extends PlanItem {...}

@Entity
@SecondaryTable( name = "Task" )
public class HumanTask extends Task {...}

@Entity
@SecondaryTable( name = "Task" )
public class ProcessTask extends Task {...}

@Entity
@SecondaryTable( name = "Task" )
public class CaseTask extends Task {...}

但我想知道是否存在更优雅、更简单的解决方案？

Answer 1

目前无法做到这一点，有关详细信息，请参阅 following issue。我认为您使用辅助表的 "hack" 目前是您可以获得的最好的。

多级层次结构的 Hibernate 混合继承策略

Hibernate mixing inheritance strategies for multi-level hierachy

java

database

hibernate

persistence

hibernate-mapping