I have two tables, Lead and LeadActivity. A lead can have many lead activities and mapping is done as #ManyToOne form LeadActivity to Lead.
Problem Statement -I want to to filter LeadActivity records such that, If there are more than one leadactivity records with same leadId, i should get only one record which is latest (have max primary key). Can anyone guide me on how to write specification or criteria API in such situations? I know this can be achieved through other ways but I have to use specification API. Below are the entity classes
Lead
#Entity
#Table(name = "customer_lead")
#Where(clause = ReusableFields.SOFT_DELETED_CLAUSE)
#Audited(withModifiedFlag = true)
#Data
public class Lead extends ReusableFields implements Serializable
{
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "lead_id", updatable = false, nullable = false)
Long leadId;
#Column(name = "name")
String customerName;
#Column(name = "primary_mobile")
String primaryMobile;
#Column(name = "secondary_mobile")
String secondaryMobile;
//more fields
}
Lead Activity
#Entity
#Table(name = "LeadActivity")
#Data
#Where(clause = ReusableFields.SOFT_DELETED_CLAUSE)
public class LeadActivity extends ReusableFields implements Serializable
{
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "leadactivity_id", updatable = false, nullable = false)
Long leadActivityId;
#Column(name = "activity_date_time", nullable = false)
#NonNull
#JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd HH:mm")
Date activityDateTime;
#Column(name = "title")
#NonNull
String title;
#OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
#JoinColumn(name = "lead_id", nullable = false)
#JsonIgnoreProperties(
{ "hibernateLazyInitializer", "handler" })
#NotFound(action = NotFoundAction.IGNORE)
Lead lead;
//More fields
}
Expected Output - Suppose there are two records present with same leadId. I want to fetch only the latest among them based on their id. One with lower id should be ignored
Try this:
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<LeadActivity> cq = cb.createQuery(LeadActivity.class);
Root<LeadActivity> rootLeadActivity = cq.from(LeadActivity.class);
Join<LeadActivity,Lead> joinLead = rootLeadActivity.join(LeadActivity_.lead,JoinType.INNER);
/* If you dont use metamodel:
* Join<LeadActivity,Lead> joinLead = rootLeadActivity.join("lead",JoinType.INNER);
*/
// For performance, if you use JPA 2.1 set the leader id condition in the join
joinLead.on(cb.equal(joinLead.get(Lead_.leadId),LEAD_ID));
List<Predicate> predicatesList= new ArrayList<>();
/* if you use version 2.0 you will have to put it in the where
* predicatesList.add(cb.equal(joinLead.get(Lead_.leadId),LEAD_ID));
*/
Subquery<Long> sqMaxId = cq.subquery(Long.class);
Root<LeadActivity> sqRootActivity = sqMaxId.from(LeadActivity.class);
Join<LeadActivity,Lead> sqJoinLead = sqRootActivity.join(LeadActivity_.lead,JoinType.INNER);
sqMaxId.where(cb.equal(sqJoinLead.get(Lead_.leadId),joinLead.get(Lead_.leadId)));
sqMaxId.select(cb.max(sqRootActivity.get(LeadActivity_.leadActivityId)));
predicatesList.add(cb.equal(rootLeadActivity.get(LeadActivity_.leadActivityId),sqMaxId.getSelection()));
cq.where(predicatesList.toArray(new Predicate[predicatesList.size()]));
cq.multiselect(rootLeadActivity);
The result query:
select a.* from lead_activity a
inner join lead l on a.lead_id = l.lead_id and l.lead_id = LEAD_ID
where a.lead_activity_id =
(select max(lead_activity_id) from lead_activity where lead_id = LEAD_ID)
Related
I started to learn spring data rest. I'm doing PUT operation and it's not working for the nested objects for ManyToMany relationship, whereas it works fine for OneToMany relation.
Entities structures:
#Table(name="CONFIG_DTLS",schema = "app_txn")
#Entity
public class Config {
#Id
#GenericGenerator(name = "UUIDGenerator", strategy = "uuid2")
#GeneratedValue(generator = "UUIDGenerator")
#Column(name = "ID", updatable = false, nullable = false)
private UUID id;
#Column(name = "NAME", nullable = false, length = 75)
private String name;
/*Unable to replace the data in the MBR_CONFIG_MAPPING table in the put operation.
When the control comes to #HandleBeforeSave annotated method in PUT operation,
the request data contains the existing Member info instead of the one which i'm passing in the PUT request body */
#ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE},fetch = FetchType.EAGER)
#JoinTable(schema = "app_txn", name = "MBR_CONFIG_MAPPING",
joinColumns ={#JoinColumn(name="CONFIG_ID",referencedColumnName = "ID")},
inverseJoinColumns = {#JoinColumn(name="MBR_ID",referencedColumnName = "ID")}
)
private Set<Member> members;
//able to replace the notifications completely in PUT operation
#OneToMany(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
#JoinColumn(name = "CONFIG_ID",referencedColumnName = "ID")
private Set<Notification> notifications;
}
Member.java
#Table(name="MBR_DTLS",schema = "app_txn")
#Entity
public class Member {
#Id
#GenericGenerator(name = "UUIDGenerator", strategy = "uuid2")
#GeneratedValue(generator = "UUIDGenerator")
#Column(name = "ID", updatable = false, nullable = false)
private UUID id;
#Column(name = "OTHER_MBR_DATA", updatable = false)
private String otherMbrData;
}
Notification.java
#Table(name="NOTIFICATIONS",schema = "app_txn")
#Entity
public class Notification {
#Id
#GenericGenerator(name = "UUIDGenerator", strategy = "uuid2")
#GeneratedValue(generator = "UUIDGenerator")
#Column(name = "ID", updatable = false, nullable = false)
private UUID id;
#Column(name="LEVEL")
private String level;
#Column(name="EMAIL")
private String email;
}
Interfaces:
#RepositoryRestResource(collectionResourceRel = "configs", path="configs")
public interface ConfigRepo extends PagingAndSortingRepository<Config,UUID> {
}
#RepositoryRestResource(exported=false) // don't want to users to manipulate it directly.
public interface MemberRepo extends PagingAndSortingRepository<Member,Object> {
}
Here I don't want to add or modify anything in the MBR_DTLS table as it is loaded by another backend process. I want to update only the mapping details MBR_CONFIG_MAPPING table whenever user does the PUT/update operation. POST/create operation is working fine. Please share your thoughts on how to fix this and if you have any questions add it in the comment section.
PS: I referred some links online but that does not help much - Spring Data REST - PUT request does not work properly since v.2.5.7
I created a table, Category in Postgres which holds both parent and child categories and references to itself (it's a self join table)
The table comprises of following columns: id, parent_id, start_date, end_date, status
I also have one row for root parent whose id = 0. So, any first level categories have root as its parent.
Example: Apparel > Women. Here Apparel(id=1) is a first level category whose parent_id = 0. Women is another category whose parent_id = 1.
I am using Spring JpaRepository findAll on my table and this is leading to infinite recursion.
POJO
#Table(name = "ofr_category")
#Getter
#Setter
#NoArgsConstructor
public class Category {
#Id
#Column(name = "cat_id", updatable = true, unique = true, nullable = false)
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "CATEGORY_SEQ")
#SequenceGenerator(sequenceName = "CATEGORY_ID_SEQ", allocationSize = 1, name = "CATEGORY_SEQ")
private Long id;
#Column(name = "cat_name")
private String name;
#Column(name = "cat_status")
private String status;
#Column(name = "start_date")
private LocalDate startDate;
#Column(name = "end_date")
private LocalDate endDate;
#Column(name = "parent_id")
private Long parentId;
#JsonBackReference
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "parent_id", insertable = false, updatable = false)
private Category parentCategory;
#JsonManagedReference
#OneToMany(fetch = FetchType.EAGER, mappedBy = "parentCategory")
private List<Category> childCategories;
public Category getParentCategory(){
return parentCategory;
}
}
Exception seen
"Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Direct self-reference leading to cycle (through reference chain: java.util.ArrayList[0]->com.test.category.dataobject.Category[\"parentCategory\"]->com.test.category.dataobject.Category[\"parentCategory\"]->com.test.category.dataobject.Category[\"parentCategory\"])",
Maybe you can have a look into #JsonIdentityInfo, which solved a similar problem for me. You can check if this basic annotation works for you.:
#JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
public class Category {
...
}
When I use skuRepository.getAll(), it works OK, but when I apply filters, defined in Specification (List filteredRegs = skuRepository.getAll(specification)) I still get all the rows of the table
What should i do to apply the specifications to my custom method?
public interface SkuRepository extends CrudRepository<Sku, Integer>, JpaSpecificationExecutor<Sku> {
#Query("select s from Sku s join fetch s.unit un join fetch s.supplier sup WHERE un.id = sku_unit_id AND sup.id = supplier_id")
List<Sku> getAll(#Nullable Specification<Sku> var1);
#Query("select s from Sku s join fetch s.unit un join fetch s.supplier sup WHERE un.id = sku_unit_id AND sup.id = supplier_id")
List<Sku> getAll();
}
UPD:
Here is my entities.
When I make sampling by a Sku table using the Specification API, I see three separate selects in log: one for Sku entity, one for Unit and one for Suppliers. I want my app to make one select with joins.
I read that this is due to the fact that I use EAGER fetch type, so I change it to LAZY, but then I got another problem: "InvalidDefinitionException: No serializer found..." This is logical because related entities Unit and Supplier are not loaded.
Then I decided to write my custom getAll() with request:
#Query("select s from Sku s join fetch s.unit un join fetch s.supplier sup WHERE un.id = sku_unit_id AND sup.id = supplier_id ORDER BY s.name")
But now it does not support Specification.
Please advise what to do.
#Entity
#Table(name = "sku")
public class Sku implements Cloneable, CloneableEntity {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private int id;
#Column(name = "sku_code", length = 6, nullable = false, unique = true)
private String code;
#Column(name = "sku_name", nullable = false)
private String name;
#ManyToOne(cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
#JoinColumn(name = "sku_unit_id", nullable = false)
private Unit unit;
#ManyToOne(cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
#JoinColumn(name = "supplier_id", nullable = false)
private Supplier supplier;
#Column(name = "qty_in_sec_pkg")
private int quantityInSecondaryPackaging;
#Column(name = "sku_is_active", nullable = false)
private boolean isActive;
//constructors, getters, setters
}
#Entity
#Table(name = "units")
public class Unit {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id ")
private int id;
#Column(name = "unit", nullable = false, unique = true)
private String unit;
#Column(name = "description")
private String description;
//constructors, getters, setters
}
#Entity
#Table(name = "suppliers")
public class Supplier {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id ")
private int id;
#Column(name = "supplier_code", length = 6, nullable = false, unique = true)
private String supplierCode;
#Column(name = "supplier_name", nullable = false)
private String name;
#Column(name = "create_date", length = 19, nullable = false)
private String createDate;
#Column(name = "update_date", length = 19)
private String updateDate;
//constructors, getters, setters
}
You can't mix #Query and Specification
You can only use JpaSpecificationExecutor interface methods to use Specification.
Find more details here
I have a one-to-many relationship between routes and stops. In order to maintain an audit trail, my Stop entities have a "historic" boolean.
When fetching a route, I want to ignore historic stops, and so I constructed this query:
#Query("select r from Route r " +
"left join fetch r.schedules schedule " +
"left join fetch r.stops stop " +
"where r.routeId = :routeId and stop.historic = false ")
Optional<Route> findByIdLoadStops(#Param("routeId") int routeId);
This works fine when the route has non-historic stops and no stops, but when the route only has a historic stop (which shouldn't happen but I want to be able to at least handle it), it returns an empty optional as though an inner join has been performed.
When logging the JPA query created by hibernate, I can see that the query uses a left outer join.
What have I done incorrectly?
Route and Stop entities:
#Table(name = "route")
#Entity
public class Route {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "routeId", columnDefinition = "SMALLINT(5) UNSIGNED")
private int routeId;
#Column(name = "locked")
private boolean locked = false;
#OneToMany(mappedBy = "route",
cascade = CascadeType.ALL,
fetch = FetchType.LAZY)
#OrderBy("stopTime asc")
private SortedSet<Stop> stops = new TreeSet<>();
public Route() {
}
}
#Table(name = "stop", uniqueConstraints = {
#UniqueConstraint(columnNames = {"stopTime", "routeId"}),
#UniqueConstraint(columnNames = {"stopName", "routeId"})})
#Entity
public class Stop implements Comparable<Stop> {
#Id
#Column(name = "stopId")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int stopId;
#Column(name = "routeId",
columnDefinition = "SMALLINT(5)",
updatable = false, insertable = false)
private int routeId;
#ManyToOne(cascade = CascadeType.MERGE,
fetch = FetchType.LAZY)
#JoinColumn(name = "routeId")
private Route route;
#Column(name = "stopTime")
private LocalTime stopTime;
#Column(name = "stopName")
private String stopName;
#JoinColumn(name = "originalId", referencedColumnName = "stopId")
#ManyToOne(fetch = FetchType.LAZY)
private Stop originalStop = this;
#Column(name = "historic")
private boolean historic = false;
public Stop() {
}
}
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