JPA join multiple table one to many and one to one - spring

Question

I have this 4 tables on Oracle DB
FACTORY_MASTER
FACTORY_DETAILS
LOT_MASTER
LOT_DETAILS
Relations
FACTORY_MASTER 1 - N FACTORY_DETAILS
LOT_MASTER 1 - N LOT_DETAILS
FACTORY_DETAILS 1 - 1 LOT_DETAILS
This is the current implementation of Model class
public class FactoryMaster {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "factory_master_gen")
#SequenceGenerator(name = "factory_master_gen", sequenceName = "seq_factory_master")
#Column(name = "FACTORY_MASTER_ID")
private Long id;
#OneToMany(cascade = CascadeType.ALL,
orphanRemoval = true,
fetch = FetchType.LAZY)
#JoinColumn(name = "FACTORY_MASTER_ID",
referencedColumnName = "FACTORY_MASTER_ID",
nullable = false)
private List<FactoryDetail> details;
}
public class FactoryDetail {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "factory_detail_gen")
#SequenceGenerator(name = "factory_detail_gen", sequenceName = "seq_factory_detail")
#Column(name = "FACTORY_DETAIL_ID")
private Long id;
// I exclude on purpose ManyToOne, because you cannot have FactoryDetail without a Master
#OneToOne(mappedBy = "factoryDetail")
private LotDetail lotDetail;
}
public class LotMaster {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "lot_master_gen")
#SequenceGenerator(name = "lot_master_gen", sequenceName = "seq_lot_master")
#Column(name = "LOT_MASTER_ID")
private Long id;
#OneToMany(cascade = CascadeType.ALL,
orphanRemoval = true,
fetch = FetchType.LAZY)
#JoinColumn(name = "LOT_MASTER_ID",
referencedColumnName = "LOT_MASTER_ID",
nullable = false)
private List<LotDetail> details;
}
public class LotDetail {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "lot_detail_gen")
#SequenceGenerator(name = "lot_detail_gen", sequenceName = "seq_lot_detail")
#Column(name = "LOT_DETAIL_ID")
private Long id;
#OneToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "FACTORY_DETAIL_ID",
referencedColumnName = "FACTORY_DETAIL_ID")
private FactoryDetail factoryDetail;
}
I need to extract the factory_master using lot_master_id
So the query would be
select distinct fm.*
from factory_master fm
join factory_details fd on fd.factory_master_id = fm.factory_master_id
join lot_details ld on fd.lot_details_id = ld.lot_details_id
join lot_master lt on ld.lot_master_id = lt.lot_master_id
where lt.lot_master_id = :ID
How can get the same result via JPQL valid?
Thank you

Answer 1

May be using a cross join like this would help:
select distinct fm
from
FactoryMaster fm
inner join fm.details fd
inner join fd.lotDetail ld1
,LotMaster lm
inner join lm.details ld2
where
ld2.id = ld1.id
and
lm.id = :lotMasterId

Answer 2

#Query(value = "select distinct fm.*from factory_master fm
join factory_details fd on fd.factory_master_id = fm.factory_master_id
join lot_details ld on fd.lot_details_id = ld.lot_details_id
join lot_master lt on ld.lot_master_id = lt.lot_master_id
where lt.lot_master_id =:#{#Id}", nativeQuery = true)
List<FactoryMaster > getFactoryMaster(#Param("Id")Long Id);
u can use like this