Embedded (Java EE 5)

Java EE API

previous page next page

Overview

Package

Class

Tree

Deprecated

Index

Help

PREV CLASS NEXT CLASS

FRAMES NO FRAMES

SUMMARY: REQUIRED | OPTIONAL

DETAIL: ELEMENT

javax.persistence Annotation Type Embedded

@Target(value={METHOD,FIELD}) @Retention(value=RUNTIME) public @interface Embedded

Implements: Annotation

@Target(value={METHOD, FIELD})
@Retention(value=RUNTIME)

定义值为可嵌入类实例的实体的持久字段或属性。可嵌入的类必须注释为 Embeddable。

示例：

   @Embedded
   @AttributeOverrides({
       @AttributeOverride(name="startDate",
           column=@Column("EMP_START")),
       @AttributeOverride(name="endDate", column=@Column("EMP_END"))
   })
   public EmploymentPeriod getEmploymentPeriod() { ... }

since

Java Persistence 1.0

英文文档：

Defines a persistent field or property of an entity whose value is an instance of an embeddable class. The embeddable class must be annotated as Embeddable.

   Example:

   @Embedded
   @AttributeOverrides({
       @AttributeOverride(name="startDate",
           column=@Column("EMP_START")),
       @AttributeOverride(name="endDate", column=@Column("EMP_END"))
   })
   public EmploymentPeriod getEmploymentPeriod() { ... }

Since:: Java Persistence 1.0