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我有一个Request对象,它具有OneToMany映射到KPI(请求包含KPI列表)...现在我需要使用某些参数根据数据设置(不是数据库约束),传递的参数应该只返回一个Request对象,问题是创建的Hibernate查询已经离开了KPI的外部连接,所以如果Request中有5个KPI,则有5个重复行回来......我只需要一个...我怎样才能实现这一如何在使用条件时避免休眠时使用OneToMany执行左外连接
代码阅读:
Criteria criteria = session.createCriteria(GroupKpiRequest.class);
criteria.add(Restrictions.eq("levelCategory",LevelCategory.COMPANY));
if(cycleNumber == 0){
cycleNumber = getActiveCycleNo();
}
criteria.add(Restrictions.eq("cycleNumber",cycleNumber));
List<GroupKpiRequest> matchingRequests = (List<GroupKpiRequest>)
criteria.list();
if(matchingRequests != null && matchingRequests.size() == 1){
GroupKpiRequest companyRequestToDelete =
matchingRequests.get(0);
请求类:
public class GroupKpiRequest {
.
.
.
@OneToMany(mappedBy="groupKpiRequest", cascade={CascadeType.ALL}, fetch=FetchType.LAZY)
@Cascade({
org.hibernate.annotations.CascadeType.SAVE_UPDATE,
org.hibernate.annotations.CascadeType.DELETE,
org.hibernate.annotations.CascadeType.MERGE,
org.hibernate.annotations.CascadeType.PERSIST,
org.hibernate.annotations.CascadeType.DELETE_ORPHAN//,
org.hibernate.annotations.CascadeType.EVICT
})
@OrderBy("groupKpiId")
@Fetch(FetchMode.SUBSELECT)
private List<GroupKPI> kpiSet;
KPI类:
public class GroupKPI implements Serializable{
@OneToOne(fetch=FetchType.EAGER)
@JoinColumn(name="CALCULATION_METHOD",referencedColumnName="METHOD_NAME")
private CalculationMethod calculationMethod;
@ManyToOne
@JoinColumns({
@JoinColumn(name="GRP_KPI_REQ_ID",referencedColumnName="GRP_KPI_REQ_ID" , nullable=false)
}
)
@Fetch(FetchMode.JOIN)
private GroupKpiRequest groupKpiRequest;
查询:
select .....
from
REQUEST this_
left outer join
GROUP_KPI kpiset2_
on this_.GRP_KPI_REQ_ID=kpiset2_.GRP_KPI_REQ_ID
left outer join
CALC_METHOD calculatio3_
on kpiset2_.CALCULATION_METHOD=calculatio3_.METHOD_NAME
left outer join
ORGANIZATION organizati4_
on this_.CYCLE_NO=organizati4_.CYCLE_NO
and this_.ORG_ID=organizati4_.ORG_ID
where
this_.deleted = 0
and this_.GRP_KPI_REQ_ID=?
order by
kpiset2_.GRP_KPI_ID asc
实际上删除OrderBy没有解决问题,但引入了Distinct选项做到了这一点......我发现hibernate默认根据https://stackoverflow.com/questions/40626002/jpa-one -to-many-join-table-give-incorrect-child-records –
@osamayaccoub我不认为这个问题描述了原因。有一个隐式连接:'连接 packagesItem = pRoot.join(“item”)'。 –