PrimaryKeyJoinColumns (Java EE 5)

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SUMMARY: REQUIRED | OPTIONAL

DETAIL: ELEMENT

javax.persistence Annotation Type PrimaryKeyJoinColumns

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

Implements: Annotation

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

此注释组合 PrimaryKeyJoinColumn 注释。它用于映射复合外键。

示例 1：ValuedCustomer 子类

    @Entity
    @Table(name="VCUST")
    @DiscriminatorValue("VCUST")
    @PrimaryKeyJoinColumns({
        @PrimaryKeyJoinColumn(name="CUST_ID", 
            referencedColumnName="ID"),
        @PrimaryKeyJoinColumn(name="CUST_TYPE",
            referencedColumnName="TYPE")
    })
    public class ValuedCustomer extends Customer { ... }

since

Java Persistence 1.0

英文文档：

This annotation groups PrimaryKeyJoinColumn annotations. It is used to map composite foreign keys.

    Example 1: ValuedCustomer subclass

    @Entity
    @Table(name="VCUST")
    @DiscriminatorValue("VCUST")
    @PrimaryKeyJoinColumns({
        @PrimaryKeyJoinColumn(name="CUST_ID", 
            referencedColumnName="ID"),
        @PrimaryKeyJoinColumn(name="CUST_TYPE",
            referencedColumnName="TYPE")
    })
    public class ValuedCustomer extends Customer { ... }

Since:: Java Persistence 1.0

Required Element Summary
`PrimaryKeyJoinColumn[]`	`value` One or more `PrimaryKeyJoinColumn` annotations.

Element Detail

abstract public PrimaryKeyJoinColumn[] value()
一个或多个 `PrimaryKeyJoinColumn` 注释。

英文文档：
value

public abstract PrimaryKeyJoinColumn[] value

One or more PrimaryKeyJoinColumn annotations.