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;

    }

}