[英]@OneToOne is not fetching in CriteriaBuilder with OpenJPA
考慮以下映射
@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;
}
}
我想查詢列表VerkoopOrder
與一對一BetalingsInformatie
內與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字段始終為null,(您還可以看到我正在獲取VerkoopOrderLijnen
的列表,該列表已經填充得很好。我還能嘗試什么來獲取betalingsInformatie嗎?我很害怕不得不單獨查詢服務中的每個betalinginformatie字段,而不是直接來自查詢結果。
有人有見識嗎? 請記住,這是使用OpenJPA實現而不是休眠或eclipselink
惰性JPA屬性可以引發異常,也可以執行應做的事情:加載另一個實體。 您沒有看到異常->實體必須已加載。 Null可能是正確的結果。 請檢查您正在加載的特定記錄的聯接列。 我猜沒有其他實體從那里映射過。
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