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Hibernate 注解元数据

发布于 2024-11-29 09:37:18 字数 1362 浏览 3 评论 0原文

有没有办法获取有关我的 Hibernate 注释的元数据？

我需要有关关联的信息（如果它们可为空）。

现在我只能查询 ClassMetadata

http://docs.jboss.org/hibernate/core/3.5/javadocs/org/hibernate/metadata/ClassMetadata.html

我可以在其中运行属性并检查它是否是

EntityType
http://docs.jboss.org/hibernate /core/3.5/javadocs/org/hibernate/type/EntityType.html

或 CollectionType
http://docs.jboss.org/hibernate /core/3.5/javadocs/org/hibernate/type/CollectionType.html

EntityType 显然有一个 isNullable 函数，但没有CollectionType

所以我考虑使用注释信息

 @GenericGenerator(name = "generator", strategy = "foreign", parameters = @Parameter(name = "property", value = "seizureI18n"))
 @Id
 @GeneratedValue(generator = "generator")
 @Column(name = "id", unique = true, nullable = false)
 public Integer getId() {
   return this.id;
 }

这是否可能或可能是另一种方式来实现我想要的。

问候

原文

is there a way how I can get MetaData about my Hibernate Annotations?

I need information about Associations if they are nullable or not.

Right now I can only query for ClassMetadata

http://docs.jboss.org/hibernate/core/3.5/javadocs/org/hibernate/metadata/ClassMetadata.html

Where I can run through the properties and check if it is a

EntityType
http://docs.jboss.org/hibernate/core/3.5/javadocs/org/hibernate/type/EntityType.html

or CollectionType
http://docs.jboss.org/hibernate/core/3.5/javadocs/org/hibernate/type/CollectionType.html

EntityType apparently has a isNullable function but not CollectionType

So I thought about using the Annotation information

 @GenericGenerator(name = "generator", strategy = "foreign", parameters = @Parameter(name = "property", value = "seizureI18n"))
 @Id
 @GeneratedValue(generator = "generator")
 @Column(name = "id", unique = true, nullable = false)
 public Integer getId() {
   return this.id;
 }

Is this possible or maybe another way to achieve what I want.

Regards

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眉目亦如画i 2024-12-06 09:37:18

我不确定我是否理解你的问题，但如果你想查看注释是否存在，你可以这样做（使用内省）：

Annotation[] tabAnnotation = A.class.getField( "fieldB" ).getDeclaredAnnotations( );
for( Annotation annotation : tabAnnotation )
   if( annotation instanceof Entity )
      System.out.println( ((Entity)annotation).isNullable() );

I am not sure I understand your question, but if you want to see if an annotation is present you could do like this (using introspection):

Annotation[] tabAnnotation = A.class.getField( "fieldB" ).getDeclaredAnnotations( );
for( Annotation annotation : tabAnnotation )
   if( annotation instanceof Entity )
      System.out.println( ((Entity)annotation).isNullable() );

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