程序包 org.hibernate.annotations

注释类型 ManyToAny

@Target({METHOD,FIELD})
@Retention(RUNTIME)
public @interface ManyToAny

This is the collection-valued form of @Any definitions. Defines a ToMany-style association pointing to one of several entity types depending on a local discriminator. See Any for further information.

作者:

Emmanuel Bernard, Steve Ebersole

另请参阅:

Any

必需元素概要

所需元素

修饰符和类型	必需的元素	说明
javax.persistence.Column	metaColumn	Metadata discriminator column description, This column will hold the meta value corresponding to the targeted entity.

可选元素概要

可选元素

修饰符和类型	可选元素	说明
javax.persistence.FetchType	fetch	Defines whether the value of the field or property should be lazily loaded or must be eagerly fetched.
String	metaDef	Metadata definition used.

元素详细资料

metaColumn

javax.persistence.Column metaColumn

Metadata discriminator column description, This column will hold the meta value corresponding to the targeted entity.

metaDef

String metaDef

Metadata definition used. If defined, should point to a @AnyMetaDef name If not defined, the local (ie in the same field or property) @AnyMetaDef is used

默认值:

""

fetch

javax.persistence.FetchType fetch

Defines whether the value of the field or property should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement on the persistence provider runtime that the value must be eagerly fetched. The LAZY strategy is applied when bytecode enhancement is used. If not specified, defaults to EAGER.

默认值:

javax.persistence.FetchType.EAGER