JPA 中注解一个父类中多个子类实现查询部分子类方法解决方法

? 父类：

@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "DTYPE", discriminatorType = DiscriminatorType.STRING)
public class SettleBill extends PersistenceSupport {

?

子类：

@Entity
@DiscriminatorValue("SupplierVacationBill")
public class SupplierVacationBill extends SettleBill ；

?

@Entity
@GenericGenerator(name = "seq_gen", strategy = "org.hibernate.id.enhanced.SequenceStyleGenerator", parameters = {@Parameter(name = "sequence_name", value = "seq_SupplierFlightBill"), @Parameter(name = "initial_value", value = "100000")})
public class SupplierFlightBill extends SettleBill；

?

?

@Entity
@GenericGenerator(name = "seq_gen", strategy = "org.hibernate.id.enhanced.SequenceStyleGenerator", parameters = {@Parameter(name = "sequence_name", value = "seq_SupplierHotelBill"), @Parameter(name = "initial_value", value = "100000")})
public class SupplierHotelBill extends SettleBill；

?

@Entity
@GenericGenerator(name = "seq_gen", strategy = "org.hibernate.id.enhanced.SequenceStyleGenerator", parameters = {@Parameter(name = "sequence_name", value = "SEQ_SETTLE_BILL"), @Parameter(name = "initial_value", value = "100000")})
public class SameTradeFlightBill extends SettleBill；

?

?

查询其中SupplierFlightBill ，SupplierHotelBill ，SupplierVacationBill? 但是不查询SameTradeFlightBill 一次性查询：

本人解决方案：

?DynamicQuery dquery = new DynamicQuery(" select distinct? vb from " + searchCondition.getForTypeName() + " vb ");

?

// 设置查询的辨别列名称
????dquery.append("and (");
????dquery.append(" vb.class=SupplierFlightBill or vb.class=SupplierHotelBill or vb.class=SupplierVacationBill ");
????dquery.append(" )");

?

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请问高人有没有更简单的解决方案！本人认为自己的解决方案不够好！希望给出解决方案！！

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