多级层次结构的Hibernate混合继承策略

Question

我有以下类结构：

我想用hibernate生成如下三个表：

• PlanItem：及其所有属性
• 任务：及其所有属性及其子属性
• 舞台：及其所有属性

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 {...}

我已经对辅助表进行了试验，并获得了或多或少想要的结果：

@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

目前不可能，请参阅following issue 了解更多信息。我认为你使用辅助表的“hack”是目前你能得到的最好的。