I have Pojo mapped with JPA annotations like this
#Entity
#Table(name = "record")
public class SearchRecord {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE)
private int id;
private String vidName;
#ElementCollection
private List<String> videoLabels = new ArrayList<String>();
and would like to run a Hibernate query that filters out all SearchRecords that match/contain 1..n videoLabels. (only objects that match all of the videoLabels)
I was able to search for SearchRecords that match a single label by running the following query:
String labelCar = "Car";
String labelPerson = "Person";
TypedQuery<SearchRecord> query = em.createQuery("SELECT b FROM SearchRecord b JOIN b.videoLabels l WHERE l = :param1",SearchRecord.class);
query.setParameter("param1", labelCar);
List<SearchRecord> results = query.getResultList();
But how can I execute a query filtering out all SearchResults matching Car and Person?
Thanks for your support
I was able to solve the problem with the following query
SELECT DISTINCT a FROM SearchRecord a JOIN a.labels b JOIN a.labels c WHERE b.name = 'Car' and c.name = 'Person'
Related
Spring DATA JPA question... I am trying to write a query to access the data in my sql join table.
I have my join table set up as follows:
#Entity
#Table(name="WritingCompany")
public class WritingCompany {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "companyId")
private Long id;
// private String companyName;
#ManyToMany
#JoinTable(name = "Join-WritingCo-Carrier",
joinColumns = #JoinColumn(name="writingCo"),
inverseJoinColumns = #JoinColumn(name="carrier")
)
private Set<CarrierAppointment> carriers;
//...getters and setters
}
public class CarrierAppointment {
// ...
#ManyToMany(
cascade=CascadeType.ALL,
mappedBy = "companyName"
)
private Set<WritingCompany> companies;
public Set<WritingCompany> getCompanies() {
return companies;
}
public void setCompanies(Set<WritingCompany> companies) {
this.companies = companies;
}
//...
}
I am unsure which class repository I need to write the query for... I am trying to find all the writingCo names from the join table that all have the same carrier id that matches one specific carrier.
The Join Table is set up through writing company but I feel like it should be accessed through CarrierAppointment Repository since I am matching carrier Id's.
This is what I've tried in the CarrierAppointmentrepository and it throws this error (unexpected token: Join near line 1, column 94):
#Query("Select companyName FROM WritingCompany INNER JOIN CarrierAppointment ON Join-WritingCo-Carrier.carrier= CarrierAppointment.CarrierAppointmentId")
List<CarrierAppointment> findCarrierAppoinmentFromJoin(CarrierAppointment carrier);
I've also tried:
#Query("SELECT writingCo FROM Join-WritingCo-Carrier WHERE carrier= CarrierAppointment.CarrierAppointmentId")
List<CarrierAppointment> findCarrierAppoinmentFromJoin(CarrierAppointment carrier);
Then I tried this in the writingCompanyRepository which also throws a similar error:
#Query("Select companyName FROM WritingCompany INNER JOIN CarrierAppointment ON Join-WritingCo-Carrier.carrier= CarrierAppointment.CarrierAppointmentId")
List<WritingCompany> findAllWithDescriptionQuery(CarrierAppointment carrier);
I am having a hard time understanding what this query is saying. Do I ever need to access the columns from the sql join table, or am I just querying around the join table by asking for each class that is making up the join columns in the join table? What is the right part of the statement, after INNER JOIN stating ? Could someone please provide a deeper explanation of why the query is written so I can figure out why it's not working? I've been reading a lot of inner join examples and just can't seem to figure it out.
I have the following 3 entities: Item, Warehouse and ItemWarehouse which has item_id and warehouse_id. I've set up the #OneToMany and #ManyToOne relationships on the 3 tables. In addition, I use soft-deletes, so each Entity has #Where(clause = "deleted_flag = 0").
I wrote a query to fetch all items that goes like this:
SELECT i FROM Item i
JOIN FETCH i.itemWarehouses iw
JOIN FETCH iw.warehouse
The JPQL converts to this statement on the console:
select
// fields
from item item0_
inner join item_warehouse itemwareho1_ on item0_.id=itemwareho1_.item_id and ( itemwareho1_.deleted_flag = 0)
inner join warehouse warehouse2_ on itemwareho1_.warehouse_id=warehouse2_.id
where ( item0_.deleted_flag = 0)
It is visible that the first inner join and the last where clause contain deleted_flag = 0 but the 2nd inner join doesn't. Why is that?
My Entities are defined like this
#Entity
#Table(name = "item")
#Where(clause = "deleted_flag = 0")
class Item
#Entity
#Table(name = "item_warehouse",)
#Where(clause = "deleted_flag = 0")
class ItemWarehouse
#Entity
#Table(name = "warehouse")
#Where(clause = "deleted_flag = 0")
class Warehouse
Im working in a backend API using Java and MySql, and I'm trying to use #SqlResultSetMapping in JPA 2.1 for mapping a ONE-TO-MANY native query result into a POJO class, this is the native query:
#NamedNativeQuery(name = "User.getAll”, query = "SELECT DISTINCT t1.ID, t1.RELIGION_ID t1.gender,t1.NAME,t1.CITY_ID , t2.question_id, t2.answer_id FROM user_table t1 inner join user_answer_table t2 on t1.ID = t2.User_ID“,resultSetMapping="userMapping")
And, here is my result SQL mapping:
#SqlResultSetMapping(
name = "userMapping",
classes = {
#ConstructorResult(
targetClass = MiniUser.class,
columns = {
#ColumnResult(name = "id"),
#ColumnResult(name = "religion_id"),
#ColumnResult(name = "gender"),
#ColumnResult(name = "answers"),
#ColumnResult(name = "name"),
#ColumnResult(name = "city_id")
}
),
#ConstructorResult(
targetClass = MiniUserAnswer.class,
columns = {
#ColumnResult(name = "question_id"),
#ColumnResult(name = "answer_id")
}
)
})
And, here is the implementation of the POJO classes: (I just removed the constructor and the getters/setter)
MiniUser class
public class MiniUser {
String id;
String religionId;
Gender gender;
List<MiniUserAnswer> answers;
String name;
String city_id;
}
and the MiniUserAnswer class
public class MiniUserAnswer {
String questionId;
String answerId;
}
My goal is to execute this Query and return a list of MiniUser, and in each MiniUser: a list of his “answers", which is a list of MiniUserAnswer.
after running this code, I got this error:
The column result [answers] was not found in the results of the query.
I know why, it's because there is no “answers" field in the query select statement.
So, how can I accomplish something like this, considering the performance? This answers list may reach 100.
I really appreciate your help, Thanks in advance!
The query "SELECT DISTINCT t1.ID, t1.RELIGION_ID t1.gender, t1.NAME, t1.CITY_ID, t2.question_id, t2.answer_id" does not return a parameter called answers.
To obtain the result you are looking for I would use:
Option 1 (Criteria Builder)
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<UserTableEntity> cq = cb.createQuery(UserTableEntity.class);
Root<UserTableEntity> rootUserTable = cq.from(UserTableEntity.class);
Join<UserTableEntity,UserAnswerTableEntity> joinAnswerTable = rootUserTable.join(rootUserTable_.id) // if the relationship is defined as lazy, use "fetch" instead of "join"
//cq.where() NO WHERE CLAUSE
cq.select(rootUserTable)
entityManager.createQuery(cq).getResultList();
Option 2 (Named query, not native)
#NamedQuery(name = "User.getAll”, query = "SELECT t1 FROM UserTableEntityt1 join fetch t1.answers)
Option 3 (Entity subgraph, new in JPA 2.1)
In User Entity class:
#NamedEntityGraphs({
#NamedEntityGraph(name = "graph.User.Answers", attributeNodes = #NamedAttributeNode("answers"))
})
In DAO set hints in the entity manager:
EntityGraph graph = this.em.getEntityGraph("graph.User.Answers");
Map hints = new HashMap();
hints.put("javax.persistence.fetchgraph", graph);
I have 2 tables:
course: id, name
student: id, course_id, age
Tables are tied with oneToMany annotation
I am trying to write a hibernate query against course that will return courses and students that are x years 0ld. That's my attempt:
SELECT c from Course c RIGHT JOIN c.student p ON p.age = 20
It returns a course that has at least one student that is 20. when there are more students that are not 20, they are included in the result set as well. Is there a way to restrict the joined table values?
Edit:
These are my entities:
public class Course implements Serializable {
private static final long serialVersionUID = 646349111982187812L;
#Id
#Column(name = "id", unique=true, nullable=false)
private String id;
#Column(name = "name", unique=false, nullable=false)
private String name;
#OneToMany(cascade={CascadeType.ALL, CascadeType.REMOVE},
fetch=FetchType.LAZY, mappedBy = "Course")
#OrderBy("age")
#JsonManagedReference
private Set<Student> students;
getters and setters ...
}
public class Student implements Serializable {
private static final long serialVersionUID = 646349221337813L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#Column(name = "age", unique=false, nullable=true)
private String age;
#ManyToOne()
#JsonBackReference
private Course course;
}
I am trying to use this method from my crudrepository to get the expected result:
#Query(?????)
public List<Course> findCoursesWithAdults(#Param("age")int age)
it sounds like you want an inner join instead of a right join
SQL
SELECT distinct c.* from Course c inner join Student p on (c.id=p.course_id and p.age=20)
or with hql
select distinct c from Course c inner join c.student p with p.age=20
in order to get the information you are requesting, you will either have to limit the Set in Course using #Where ("age = 20" ) or simply deal with a list of students instead of courses.
select p from Course c inner join c.student p with p.age=20
you can reference the attached course object through any one of the getCourse methods on the student objects. You could also use "group by" here to help you order things.
or you can use a filter within the hibernate Entity...
#Transient
public List<Students> getStudents(Integer age){
List<Students> tmp = new ArrayList<>();
for(Student s: getStudents())
if(s.getAge().equals(age))tmp.add(s);
return tmp;
}
one more edit and im done... there is another way to do this that i didnt mention..
a select wrapper query.
create a wrapper object for your course and student
public class CourseWrapper(){
private Course c;
private List<Students> p = new ArrayList<>();
....constructor ... getters ...setters
}
select new CourseWrapper(c, students)
from Course c
left outer join c.students p with p.age=20'
more info here
SELECT c.name, s.id
FROM course c
INNER JOIN student s ON c.id = s.course_id
WHERE s.age = 20
Have Employee: BaseEntity class with
public virtual BaseEntity Department {get;set;}
public virtual BaseEntity Position {get;set;}
and BaseEntity class:
public virtual long Id {get;set;}
public virtual long Name {get;set;}
How can I map my entities and /create select like this
SELECT DepartmentTable.nvarchar1 as Department, PositionTable.nvarchar1 as Position, COUNT(*) as N
FROM AllUserData EmployeeTable
left outer join AllUserData PositionTable on EmployeeTable.int2=PositionTable.tp_ID
left outer join AllUserData DepartmentTable on EmployeeTable.int3=DepartmentTable.tp_ID
WHERE EmployeeTable.tp_ListId = #p0 and PositionTable.tp_ListId = #p2 and DepartmentTable.tp_ListId = #p1
GROUP BY DepartmentTable.nvarchar1, PositionTable.nvarchar1;
I tried like this:
var criteria = session.CreateCriteria<Entities.Employee>();
criteria.CreateAlias("Position", "PositionTable", JoinType.LeftOuterJoin);
criteria.Add(Restrictions.Or(Restrictions.Eq("PositionTable.ListId", Program.PositionListGuid), Restrictions.IsNull("PositionTable.Id")));
criteria.CreateAlias("Department", "DepartmentTable", JoinType.LeftOuterJoin);
criteria.Add(Restrictions.Or(Restrictions.Eq("DepartmentTable.ListId", Program.DepartmentListGuid), Restrictions.IsNull("DepartmentTable.Id")));
criteria.Add(Restrictions.Eq("ListId", Program.EmployeeListGuid));
var projectionList = Projections.ProjectionList();
projectionList.Add(Projections.RowCount());
projectionList.Add(Projections.GroupProperty("Department"), "AliasedId");
criteria.SetProjection(projectionList);
criteria.SetResultTransformer(Transformers.AliasToBean(typeof(BaseEntity)));
var list = criteria.List<BaseEntity>();
// "More than one row with the given identifier was found" exception raised here
I'am confused, should I somehow use joined table alias for Projections.GroupProperty, rework my mapping/Entity to use only primitive types (string, int) or any other approach?
Figured out:
Add int Number to BaseEntity and string DepartmentName, string PositionName to Employee. Now I can use Projections to map Sql grouped by result to this properties:
var pl = Projections.ProjectionList()
.Add(Projections.RowCount(), GetEntityProperty(typeof (BaseEntity), "Number"))
.Add(Projections.GroupProperty("DepartmentTable.Title"), "PositionName")
.Add(Projections.GroupProperty("PositionTable.Title"), "DepartmentName");
ICriteria criteria = session.CreateCriteria<Employee>()
.CreateAlias("Position", "PositionTable", JoinType.LeftOuterJoin)
.Add(Restrictions.Eq("PositionTable.ListId", Program.PositionListGuid))
.CreateAlias("Department", "DepartmentTable", JoinType.LeftOuterJoin)
.Add(Restrictions.Eq("DepartmentTable.ListId",Program.DepartmentListGuid))
.Add(Restrictions.Eq("ListId", Program.EmployeeListGuid))
.SetProjection(pl)
.SetResultTransformer(Transformers.AliasToBean<BaseEntity>());
var list = criteria.List<BaseListEntity>().ToList();