使用JPA的@SecondaryTable来实现hibernate的混合使用“每个类分层结构一张表”和“每个子类一张表”的功能

 

@Entity
@Table(name  =   " T_BASE " )
@Inheritance(strategy  =  InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name  =   " CATEGORY " , discriminatorType  =  DiscriminatorType.STRING)
public   class  BaseDomain  ... {
}

@Entity
@DiscriminatorValue( " sub1 " )
public   class  SubDomain1  extends  BaseDomain  ... {
}

@Entity
@SecondaryTable(name  =   " T_SUB2 " )
@DiscriminatorValue( " sub2 " )
public   class  SubDomain2  extends  BaseDomain  ... {
    private String ext;

    @Column(table = "T_SUB2", name = "EXT2")
    public String getExt() ...{
        return ext;
    }
    public void setExt(String ext) ...{
        this.ext = ext;
    }
}