Question

我的查询如下：

@Query(value = "select * from participant p where case when ?1 is not null then p.BUSINESS_TYPE_ID = ?1 else p.BUSINESS_TYPE_ID is not null end " 
                    +"and case when ?2 is not null then p.CITY_ID = ?2 else p.CITY_ID is not null end "
                    +"and case when ?3 is not null then p.COUNTRY_ID = ?3 else p.COUNTRY_ID is not null end " 
                    +"and case when ?4 is not null then p.REGION_ID = ?4 else p.REGION_ID is not null end "
                    +"and case when ?5 is not null then p.PAYMENT_METHOD_TYPE_ID = ?5 else p.PAYMENT_METHOD_TYPE_ID is not null end "
                    +"and case when ?6 is not null then p.CURRENCY_ID = ?6 else p.CURRENCY_ID is not null end;", nativeQuery = true)

它在MySQL上正常工作，但我需要创建动态，它适用于MySQL和Oracle。可以在QueryDSL或Spring Data JPA中使用吗？谢谢！

Answer 1

您可以使用QueryDSL（以下只是一个要点）

JPAQuery<?> query = new JPAQueryFactory(mEntityManager).query();

QParticipant participant = QParticipant.participant;

BooleanBuilder builder = new BooleanBuilder();

builder = (null != parameter1? builder.and(participant.businessTypeId.isNotNull().and(participant.businessTypeId.eq(parameter1))): builder.and(participant.businessTypeId.isNotNull()));

builder = (null != parameter2? builder.and(participant.cityId.isNotNull().and(participant.cityId.eq(parameter2))): builder.and(participant.cityId.isNotNull()));

//... (similar for countryId, regionId, paymentMethodTypeId, currencyId)

return query.select(participant).from(participant).where(builder).fetchAll();

使用动态列和where子句在Spring Data JPA中创建查询，是否可以在QueryDSL中创建？

1 个答案: