I wonder if JPQL can be nested query. I am studying Spring Data JPA, and I also have uploaded several related questions.
If I have below sql in MySQL, how do I produce JPQL:
select
c.*
from
cheat c
left join (select * from cheat_vote where val = 1) v on c.cheat_seq = v.cheat_fk
group by
c.cheat_seq
having
count(*) < 10
limit 5
I have two entities.
public class Cheat implements Serializable{
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "cheat_seq", length = 10)
private Long cheatSeq;
#Column(name = "question", unique = true, nullable = false)
private String question;
#Column(name = "answer", unique = true, nullable = false)
private String answer;
#Column(name = "writer_ip", nullable = false)
private String writerIP;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "reg_date", nullable = false)
private Date regDate;
#Transient
private String regDateText;
#OneToMany(mappedBy = "cheat", fetch=FetchType.LAZY)
private Set<CheatVote> vote;
#Override
public String toString() {
return "Cheat [cheatSeq=" + cheatSeq + "]";
}
}
Above entity has a #OneToMany collection, and the collection entity is below.
public class CheatVote implements Serializable{
private static final long serialVersionUID = 1L;
#GeneratedValue(strategy=GenerationType.IDENTITY)
#Id
#Column(name="seq", nullable=false)
private Long seq;
#Column(name="val", nullable=false)
#NonNull
private Integer value;
#Column(name="ip_address", nullable=false)
#NonNull
private String ipAddress;
#JoinColumn(name="cheat_fk", referencedColumnName="cheat_seq")
#ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.LAZY)
#NonNull
private Cheat cheat;
#Override
public String toString() {
return "CheatVote [seq=" + seq + "]";
}
}
I want to get Cheat entitiy which has less than 10 children CheatVote entities.
You can try it:
#Query("SELECT c FROM Cheat c LEFT JOIN c.vote v WHERE v.value = 1 GROUP BY c.cheatSeq HAVING count(c) < 10")
About 'LIMIT' you can use parameter Pageable of Spring Data JPA
Related
I want to convert this sql query to a JPA query, but I can't seem make sense of it... Should I use findByMarinaIdAndMovementGroupMeanId?? or findByMarinaIdAndMovementGroupMeanIdAndMovementMeanId??
Sql:
select m.* from movement_group m
join movement_group_mean mgm on m.id = mgm.movement_group_id
join movement_mean mm on mgm.movement_mean_id = mm.id
where mm.id = 1 and m.marina_id = :marinaId and mm.active = true;
MovementGroup:
#Entity
public class MovementGroup {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
private String code;
private LocalDateTime createdAt;
private LocalDateTime updatedAt;
private Boolean active;
private String iconUrl;
#OneToMany(mappedBy = "movementGroup")
private Set<MovementGroupMean> movementGroupMeans;
#JsonIgnore
#ManyToOne()
#JoinColumn(name = "marina_id")
private Marina marina;
MovementGroupMean:
#Entity
public class MovementGroupMean {
#EmbeddedId
#JsonIgnore
private MovementGroupMeanPK movementGroupMeanPK;
#JsonBackReference
#ManyToOne
#JoinColumn(name = "movement_group_id", insertable = false, updatable = false)
private MovementGroup movementGroup;
#ManyToOne
#JoinColumn(name = "movement_mean_id", insertable = false, updatable = false)
private MovementMean movementMean;
MovementMean:
#Entity
public class MovementMean {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
#Enumerated(EnumType.STRING)
private MovementMeanType movementMeanType;
private Boolean active;
private LocalDateTime createdAt;
private LocalDateTime updatedAt;
#JsonBackReference
#ManyToOne()
#JoinColumn(name = "marina_id")
private Marina marina;
Not sure where the problem lies, so excuse the lengthy explanation on SQL->JPQL:
Replace your table names with your entity names
movement_group -> MovementGroup
Replace your joins with the java references, letting JPA use the relationship mapping you've defined instead.
"join movement_group_mean mgm on m.id = mgm.movement_group_id" becomes "join m.movementGroupMeans mgm"
"join movement_mean mm on mgm.movement_mean_id = mm.id becomes "join mgm.movementMean mm"
Only tricky spot is your entities do not define a basic mapping for the marina_id value. So to get at m.marina_id, you will have to use the 'marina' reference and use its presumably ID value:
"m.marina_id = :marinaId" -> "m.marina.id = :marinaId"
Giving you JPQL:
"Select m from MovementGroup m join m.movementGroupMeans mgm join mgm.movementMean mm where mm.id = 1 and m.marina.id = :marinaId and mm.active = true"
I have question about creating native query with custom response (spring projection) with nested „custom“ sublist i.e. i am trying to generate JSON output with nested sublists.
Child entity is:
#Entity
public class Child {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
#NotNull
#Column(nullable = false)
private String firstName;
#NotNull
#Column(nullable = false)
private String secondName;
#Enumerated(EnumType.STRING)
private Gender gender;
private Date dateOfBirth;
private String phone;
#ManyToOne
#JoinColumn(name="child_id")
private List<Parent> parents = new ArrayList<Parent>();
//...
}
Parent entity is, for example:
#Entity
public class Parent {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
#NotNull
#Column(nullable = false)
private String firstName;
#NotNull
#Column(nullable = false)
private String secondName;
private Date dateOfRegistration;
#OneToMany(fetch = FetchType.LAZY)
private List<Child> child = new ArrayList<Child>();
//...
}
Projection interface:
public interface ChildProjectionInterface {
public int getParentId();
public Date getFirstName();
public List<ChildResponse> getChildData();
interface ChildResponse {
public int getChildID();
public String getFirstName();
}
}
Query (but, obviously, doesn't working):
#Query(value = "SELECT p.id AS parentId, p.firstName AS firstName, c.id AS childData.childId, c.firstName AS childData.firstName FROM parent p LEFT JOIN child c ON p.child_id = c.child_id AND p.secondName = :secondName", nativeQuery = true)
List<ChildProjectionInterface> getListWithSubList(#Param(value ="secondName") String secondName);
I was reading and researching and trying..but nothing works (I saw https://medium.com/swlh/spring-data-jpa-projection-support-for-native-queries-a13cd88ec166, saw "for json auto" clause but not for spring jpa, etc.)
Did you try jpa fetch operator?
#Query("select p from parent p left join fetch p.child c where p.secondName = :secondName")
Procedure.java
#Entity
#Table(name = "procedures")
#JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
public class Procedure implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "ProcedureId")
private int id;
#Column(name = "ProcedureName")
private String name;
#Column(name = "ProcedureCode")
private String code;
#Column(name = "ProcedureDesc")
private String desc;
// getters and setters
}
CPTClinicianDescriptor
#Entity
#Table(name = "cliniciandescriptor")
public class CPTClinicianDescriptor {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "Id")
private int id;
#Column(name = "ConceptId")
private int conceptId;
#Column(name = "CPTCode")
private String cptCode;
#Column(name = "ClinicianDescriptorId")
private int clinicianDescriptorId;
#Column(name = "ClinicianDescriptor")
private String clinicianDescriptor;
// getters and setters
}
CPTProcedures
#Entity
#Table(name = "cptprocedures")
public class CPTProcedures {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "Id")
private int Id;
#OneToOne(fetch=FetchType.EAGER)
#JoinColumn(name = "ProcedureId")
private Procedure procedure;
#Transient
private int procedureId;
#OneToOne(fetch=FetchType.EAGER)
#JoinColumn(name = "CPTCodeSet")
private CPTClinicianDescriptor cptClinicianDescriptor;
#Transient
private int cptCodeSet;
// getters and setters
}
Here I have 3 table in mySql in those 2 are different separate tables, I created one table for Mapping that has foreign keys of Procedures and CPT when i get a list using Procedure It should get corresponding cpt data also.
ServiceImpl Like:
public List<Procedure> getCombinedProcedureList(int id) {
// TODO Auto-generated method stub
List<Procedure> pList = new ArrayList<Procedure>();
Procedure procedureList = procedureRepository.findCombById(id);
pList.add(procedureList);
return pList;
}
When i use
Repository like
#Query(value = "SELECT * FROM procedures JOIN cliniciandescriptor ON cliniciandescriptor.Id = ?1",nativeQuery = true)
Procedure findCombById(int id);
this query in Procedures Repository it is getting only procedures. So, what can i do to get the combined(joined) list of 2(procedures & CPT) tables using 3rd mapping table.
Here I have two tables; both have IDs as primary keys. I want to know how to join these tables without foreign keys, based on their IDs. What should be the service implementation and what should be in the repository? How to write #Query with JOINS?
#Entity
#Table(name = "procedures")
#JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
public class Procedure implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "ProcedureId")
private int id;
#Column(name = "ProcedureName")
private String name;
#Column(name = "ProcedureCode")
private String code;
#Column(name = "ProcedureDesc")
private String desc;
// getters and setters
}
#Entity
#Table(name = "cliniciandescriptor")
public class CPTClinicianDescriptor {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "Id")
private int id;
#Column(name = "ConceptId")
private int conceptId;
#Column(name = "CPTCode")
private String cptCode;
#Column(name = "ClinicianDescriptorId")
private int clinicianDescriptorId;
#Column(name = "ClinicianDescriptor")
private String clinicianDescriptor;
// getters and setters
}
You can use the JOIN on syntax like in SQL
For example
select p from Procedure p join CPTClinicianDescriptor c on c.id = p.id;
Read more about that topic here:
https://72.services/how-to-join-two-entities-without-mapped-relationship/
Considering it as One-to-One relation, you can use something like this.
#Entity
#Table(name = "procedures")
#JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
public class Procedure implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "ProcedureId")
private int id;
#Column(name = "ProcedureName")
private String name;
#Column(name = "ProcedureCode")
private String code;
#OneToOne(optional = false)
#JoinColumn(name = "id", updatable = false, insertable = false)
private CPTClinicianDescriptor descriptor;
#Column(name = "ProcedureDesc")
private String desc;
// getters and setters
}
I have a Entity:
#Entity
#Table(name = "story", schema = "")
#Data
public class Story implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "sID", unique = true, nullable = false)
private Long sID;
#Column(name = "vnName", nullable = false)
private String vnName;
#Temporal(TemporalType.TIMESTAMP)
#DateTimeFormat(pattern = "dd-MM-yyyy HH:mm:ss")
#Column(name = "sUpdate", length = 19)
private Date sUpdate;
}
And:
#Entity
#Table(name = "chapter", schema = "")
#Data
public class Chapter implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "chID", unique = true, nullable = false)
private Long chID;
#Column(name = "chName", nullable = false)
private String chName;
#JoinColumn(name = "sID", referencedColumnName = "sID")
#ManyToOne(fetch = FetchType.LAZY)
private Story story;
}
I had created custom pojo to get the latest update story with the latest chapter:
#Data
public class NewStory{
private Story story;
private Chapter chapter;
}
but when I get list :
#Repository
public interface StoryRepository extends CrudRepository<Story, Long> {
#Query(value="SELECT NEW com.apt.truyenmvc.entity.NewStory(s as newstory, c as newchapter)"
+ " FROM story s LEFT JOIN (SELECT * FROM Chapter c INNER JOIN "
+ " (SELECT MAX(c.chID) AS chapterID FROM Story s LEFT JOIN Chapter c ON s.sID = c.sID GROUP BY s.sID) d"
+ " ON c.chID = d.chapterID) c ON s.sID = c.sID order by s.sUpdate desc")
public List<NewStory> getTopView();
}
Error:
Warning error: org.hibernate.hql.internal.ast.QuerySyntaxException: story is not mapped.
Who could help me fix it? Or could it be done in a different way?
The error is pretty self explainatory. And its just a typo in your query. You are using story. And obviously thats not mapped as an Entity.
Fix it to Story