如何在Hibernate中映射一组枚举类型？

编程入门行业动态更新时间:2024-10-28 16:24:49

本文介绍了如何在Hibernate中映射一组枚举类型？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述在hibernate中，是否可以为一个类定义映射到一组枚举？

我已经能够找到如何定义集合映射的示例，并且我已经能够找到单独的示例来说明如何映射枚举，但是我无法确定了解如何定义一个类的枚举。

任何人都可以给我一个例子吗？

这是建立在现有应用程序之上的，因此我无法更改数据库模式。

这是我希望建模的关系。 Wicket是一个普通的类，WicketType是一个Java Enum。

+ ------------- --- + + ------------ + + ------------ + | Wicket | |参考表| | WicketType | + ---------------- + + ------------ + + ------------ + | INT | W_ID | | | | W_TypeId | | .... | | FK | W_ID | FK | WicketType | | INT | TYPE | ---- | W_TypeId | ---- | | + ---------------- + + ------------ + + ------------ +

再次感谢

解决方案
这个
a>没有做你需要的东西？

为了详细说明翻转初始响应，引用提供了使用枚举的序数来枚举枚举的方法。

在这种情况下，它实际上比它看起来更简单，因为您将枚举托管在一个集合中，您需要为WicketType的子类型IntEnumUserType提供一个访问器，超类型将负责将序号映射到实例。

package test; public class WicketTypeState extends IntEnumUserType< WicketType> {私人WicketType wicketType; public WicketTypeState（）{ //我们必须将枚举值赋给父类。 super（WicketType.class，WicketType.values（））; } public WicketType getWicketType（）{ return wicketType; } public void setWicketType（final WicketType wicketType）{ this.wicketType = wicketType;

定义枚举表的映射：

< hibernate-mapping package =test> < class name =Wickettable =Wicket> < id name =idcolumn =ID/> < set name =wicketTypestable =WicketTypeinverse =true> < key column =ID/> 然后，对于具有一组枚举的类型，定义该属性的集合映射：

< hibernate-mapping package =test> < class name =WicketTypeStatelazy =truetable =WicketType> < id name =WicketType type =test.WicketTypeState/> < / class> < / hibernate-mapping>

这个工作在我的盒子（tm）上，让我知道你是否需要更多的信息。

In hibernate, is it possible to define a mapping for a class to a set of enums?

I've been able to find examples of how to define mappings of Sets and I've been able to find separate examples for how to map Enums, but I cannot figure out how to define a of Enums for a class.

Could anyone please provide me with an example?

This is being built on top of an existing application, so I cannot alter the database schema.

This is the relation I wish to model. Wicket is a normal class and WicketType is a Java Enum.

+----------------+ +------------+ +------------+ | Wicket | | Ref Table | | WicketType | +----------------+ +------------+ +------------+ | INT | W_ID | | | | W_TypeId | | .... | | FK | W_ID | FK | WicketType | | INT | TYPE |----| W_TypeId |----| | +----------------+ +------------+ +------------+

Thanks again

解决方案

Does this not do what you need?

To elaborate on the flippant initial response, the reference provides a means to use the ordinal of the enum to map enumerations.

In this case it's actually simpler than it looks, because you are hosting the enums in a set, you need to provide an accessor for the WicketType to the sub-type of IntEnumUserType, the super-type will take care of mapping the ordinal to the instance.

package test; public class WicketTypeState extends IntEnumUserType<WicketType> { private WicketType wicketType; public WicketTypeState() { // we must give the values of the enum to the parent. super(WicketType.class, WicketType.values()); } public WicketType getWicketType() { return wicketType; } public void setWicketType(final WicketType wicketType) { this.wicketType = wicketType; } }

Define the mappings for the enum table:

<hibernate-mapping package="test"> <class name="Wicket" table="Wicket"> <id name="id" column="ID"/> <set name="wicketTypes" table="WicketType" inverse="true"> <key column="ID"/> <one-to-many class="test.WicketTypeState"/> </set> </class> </hibernate-mapping>

Then for the type with the set of enums, define a set mapping for that property:

<hibernate-mapping package="test"> <class name="WicketTypeState" lazy="true" table="WicketType"> <id name="WicketType" type="test.WicketTypeState"/> </class> </hibernate-mapping>