JoinColumns (Java EE 5)

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SUMMARY: REQUIRED | OPTIONAL

DETAIL: ELEMENT

javax.persistence Annotation Type JoinColumns

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

Implements: Annotation

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

定义复合外键的映射。此注释组合了同一关系的 JoinColumn 注释。

使用 JoinColumns 注释时，每个此类 JoinColumn 注释都必须指定 name 和 referencedColumnName 元素。

示例：
    @ManyToOne
    @JoinColumns({
        @JoinColumn(name="ADDR_ID", referencedColumnName="ID"),
        @JoinColumn(name="ADDR_ZIP", referencedColumnName="ZIP")
    })
    public Address getAddress() { return address; }

since

Java Persistence 1.0

英文文档：

Defines mapping for the composite foreign keys. This annotation groups JoinColumn annotations for the same relationship.

When the JoinColumns annotation is used, both the name and the referencedColumnName elements must be specified in each such JoinColumn annotation.

    Example:
    @ManyToOne
    @JoinColumns({
        @JoinColumn(name="ADDR_ID", referencedColumnName="ID"),
        @JoinColumn(name="ADDR_ZIP", referencedColumnName="ZIP")
    })
    public Address getAddress() { return address; }