[英]javax.persistence annotations and inheritance
I have 4 persistent classes which all have the same fields (exactly) the only 3 difference between them is 1) the class name, 2) the table name and 3) the data. 我有4个持久化类,它们都具有相同的字段(确切地说),它们之间唯一的区别是1)类名,2)表名和3)数据。 i am aware that this might seem strange to some but trust me there is a good reason which i won't go into here.
我知道这对某些人来说可能有点奇怪,但相信我有一个很好的理由我不会进入这里。
now, i'm using hibernate annotations to configure my class which should work like so: 现在,我正在使用hibernate注释来配置我的类,它应该像这样工作:
@Entity
@Table(name = "store")
public class Store
{
@Id
@Column(name = "unique_id")
protected String id;
@Column
protected String category;
...
}
.. and this does work, for a single stand-alone class, however there are many fields to map and i'd like to do it all in one hit for all four similar classes, ie: ..这确实有效,对于一个单独的类,但是有很多字段要映射,我想在所有四个相似的类中一次性完成所有这些,即:
public class StoreBase
{
@Id
@Column(name = "unique_id")
protected String id;
@Column
protected String category;
...
}
@Entity
@Table(name = "store1")
public class Store1 extends StoreBase
{}
@Entity
@Table(name = "store2")
public class Store2 extends StoreBase
{}
@Entity
@Table(name = "store3")
public class Store3 extends StoreBase
{}
@Entity
@Table(name = "store4")
public class Store4 extends StoreBase
{}
however when attempting this i get the following exception: 但是在尝试这个时我得到以下异常:
Caused by: org.hibernate.AnnotationException: No identifier specified for entity: package.entities.Store1
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:672)
at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:546)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:291)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
i'm guessing this is because the super class is not being searched for the identifier? 我猜这是因为没有搜索超类的标识符?
is there a way to utilise inheritance in this context? 有没有办法在这种情况下利用继承?
thanks, paul. 谢谢,保罗。
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