[英]@OneToOne is not fetching in CriteriaBuilder with OpenJPA
考虑以下映射
@Table(
name = "VerkoopOrder"
)
public class VerkoopOrder implements DatabaseEntity, Auditable {
@Id
@Column(
name = "VerkoopOrderId",
nullable = false
)
@GeneratedValue(
strategy = GenerationType.IDENTITY
)
public Long getVerkoopOrderId() {
return this.verkoopOrderId;
}
@OneToOne(
fetch = FetchType.LAZY
)
@JoinColumn(
name = "BetalingsInformatieId"
)
public BetalingsInformatie getBetalingsInformatie() {
return this.betalingsInformatie;
}
}
@Table(
name = "BetalingsInformatie"
)
public class BetalingsInformatie implements DatabaseEntity, Auditable {
@Id
@Column(
name = "BetalingsInformatieId",
nullable = false
)
@GeneratedValue(
strategy = GenerationType.IDENTITY
)
public Long getBetalingsInformatieId() {
return this.betalingsInformatieId;
}
@OneToOne(
mappedBy = "betalingsInformatie"
)
public VerkoopOrder getVerkoopOrder() {
return this.verkoopOrder;
}
}
我想查询列表VerkoopOrder
与一对一BetalingsInformatie
内与criteriabuilder
CriteriaBuilder builder = getEntityManager().getCriteriaBuilder();
CriteriaQuery<VerkoopOrder> query = builder.createQuery(VerkoopOrder.class);
Root<VerkoopOrder> verkoopOrder = query.from(VerkoopOrder.class);
verkoopOrder.fetch(BETALINGSINFORMATIE, JoinType.LEFT);
Join<VerkoopOrder, VerkoopOrderLijn> verkoopOrderLijnen = verkoopOrder.join(VERKOOPORDER_LIJNEN);
verkoopOrder.fetch(VERKOOPORDER_LIJNEN);
query.select(verkoopOrder);
query.distinct(true);
PredicateBuilder predicateBuilder = new PredicateBuilder(builder, verkoopOrder);
predicateBuilder
.addEqualPredicate(UUID, criteria.getUuid())
.addEqualPredicate(AANKOPER_ID, criteria.getAankoperId())
.addEqualPredicate(verkoopOrderLijnen.get(MSISDN), criteria.getMsisdn())
.addEqualPredicate(STATUS, criteria.getStatus())
.addEqualPredicate(verkoopOrderLijnen.get(VERVOERCONTRACT).get(VERVOERCONTRACT_ID), criteria.getVervoerContractId())
.addDateTimeRangePredicate(TIMESTAMP_CREATED, criteria.getTimestampCreatedStart(), criteria.getTimestampCreatedEnd())
.addDateTimeRangePredicate(TIMESTAMP_UPDATED, criteria.getTimestampUpdatedStart(), criteria.getTimestampUpdatedEnd());
query.where(predicateBuilder.build());
query.orderBy(builder.desc(verkoopOrder.get(TIMESTAMP_UPDATED)));
TypedQuery<VerkoopOrder> typedQuery = getEntityManager().createQuery(query);
List<VerkoopOrder> verkoopOrders = typedQuery.getResultList();
但是,“ betalingsInformatie字段始终为null,(您还可以看到我正在获取VerkoopOrderLijnen
的列表,该列表已经填充得很好。我还能尝试什么来获取betalingsInformatie吗?我很害怕不得不单独查询服务中的每个betalinginformatie字段,而不是直接来自查询结果。
有人有见识吗? 请记住,这是使用OpenJPA实现而不是休眠或eclipselink
惰性JPA属性可以引发异常,也可以执行应做的事情:加载另一个实体。 您没有看到异常->实体必须已加载。 Null可能是正确的结果。 请检查您正在加载的特定记录的联接列。 我猜没有其他实体从那里映射过。
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