我有一个接口(interface)ITransaction如下:publicinterfaceITransaction{DateTimeEntryTime{get;}DateTimeExitTime{get;}}我有一个派生类PaymentTransaction，如下所示:publicclassPaymentTransaction:ITransaction{publicvirtualDateTimeLastPaymentTime{get{returnDateTime.Now;}}#regionITransactionMemberspublicDateTimeEntryTime{get{

像这样尝试在带有投影的Select子句中编写子查询queryFactory.query().select(Projections.constructor(MemberPaymentDTO.class,JPAExpressions.select(coopMember).from(coopMember).where(memberPayment.memberId.eq(coopMember)).fetchOne(),JPAExpressions.select(paymentTransaction.amount).from(paymentTransaction).where(paymentTr