I tried to get all MainIntervals in a certain date interval. But I get always null.
Here is the JPA Entity
#Table(name="MAIN_INTERVAL")
#NamedQueries({
#NamedQuery(name = MainInterval.FIND_ALL, query = " select m from MainInterval m"),
#NamedQuery(name = MainInterval.FIND_BETWEEN,
query = "select m from MainInterval m where m.mainIntervalStart
BETWEEN :startDate AND :endDate
AND m.mainIntervalEnd BETWEEN :startDate AND :endDate"
) })
public class MainInterval implements Serializable {
public static final String FIND_ALL = "MainInterval.findAll";
public static final String FIND_BETWEEN = "MainInterval.findBetween";
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name="MAIN_INTERVAL_ID")
private Long id;
#Column(name="MAIN_INTERVAL_START")
#Temporal(javax.persistence.TemporalType.DATE)
private Date mainIntervalStart;
#Column(name="MAIN_INTERVAL_END")
#Temporal(javax.persistence.TemporalType.DATE)
private Date mainIntervalEnd; }
And in the EJB SessionBeans I have the method:
public List<MainInterval> findMainIntervalsBetween(Date startDate, Date endDate){
List<MainInterval> resultList = em.createNamedQuery(MainInterval.FIND_BETWEEN, MainInterval.class)
.setParameter("startDate", startDate, TemporalType.DATE).setParameter("endDate", endDate, TemporalType.DATE).getResultList();
return resultList;
}
But when I call it from JSF with CDI the resultList is always null. Although I have some MainIntervals that meet the conditions between startDate and endDate.
I would be very grateful to every answer or links for tutorial.
Best regards!
Your query is:
select m from MainInterval m where m.mainIntervalStart
BETWEEN :startDate AND :endDate
AND m.mainIntervalEnd BETWEEN :startDate AND :endDate
Your first row's interval is [01.05.2012, 31.05.2012], and your second row's interval is [01.05.2012, 01.08.2012]. The arguments of the query are 10.05.2012, 20.05.2012.
So, for your first row:
m.mainIntervalStart BETWEEN :startDate AND :endDate
01.05.2012 BETWEEN 10.05.2012 AND 20.05.2012 : false
So the first row is not returned.
For your second row:
m.mainIntervalStart BETWEEN :startDate AND :endDate
01.05.2012 BETWEEN 10.05.2012 AND 20.05.2012 : false
So the second row isn't returned either.
Everything looks normal to me.
Related
i am quite new to JPQL, i have 3 entity class Book,Loan,member, relationship
Loan-Book(#OneToOne)unidirection
Loan-Member(#OneToMany)unidirectional
snippet from my loan class
public class loan implements Serializable{
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
private String dateofissue;
private String dueDate;
#OneToOne
#JoinColumn(name = "bookid")
private book Bookid;
#ManyToOne
#JoinColumn(name="member_ID")
private member memberid;
when i write a very simple query "Select Loan from loan loan"; i get all the columns including columns member and books because of the relation
how can i write a JPQL query to return selected column book.title,book.id,loan.duedate,member.firstname,member.id from book,loan,member
the purpose of the query is to retrive all the borrowed books, by all member
thank you
You already have mappings define so just directly reference them in JPQL.
select l.Bookid.title, l.Bookid.id, loan.duedate, l.memberid.firstname,
l.memberid.id from loan l;
or you can create aliases also for shorter name.
select book.title, book.id, loan.duedate, member.firstname, member.id
from loan l join l.Book book join l.Member member;
I'm trying to get paginates orders, sorted on the cration date of the current version (currentVersion = true)
Here is the Order class :
#Entity
public class Offer extends Model {
#Id
public Long id;
....
#OneToMany(mappedBy = "offer", fetch = FetchType.EAGER)
public List<Version> versions;
...
}
Here is the version class
#Entity
public class Version extends Model {
#Id
public Long id;
#ManyToOne
#JoinColumn(name = "OFFER_ID")
public Offer offer;
public Boolean currentVersion = false;
public Date creation;
...
}
Here is the fetch code as I found on eBean documentation :
Query<Offre> query = Ebean.find(Offer.class);
List<Offer> offers = query.fetch("versions")
.where()
.eq("versions.currentVersion", true)
.orderBy("versions.creation desc nulls last")
.setFirstRow(0)
.setMaxRows(10)
.findPagedList().getList();
Here is the expected SQL
SELECT * FROM
(SELECT /*+ FIRST_ROWS(10) */ rownum rn_, a.* FROM
(SELECT t0.id c0,
...
t0.OPTLOCK c32
FROM offer t0
INNER JOIN version t1 on t0.id = t1.OFFER_ID
ORDER BY t1.creation
) a
WHERE rownum <= 10
) ; --bind()
Here is the actual SQL
First one:
SELECT *
FROM
(SELECT
/*+ FIRST_ROWS(10) */
rownum rn_,
a.*
FROM
( SELECT DISTINCT t0.id c0,
...
t0.id
...
FROM offer t0
JOIN versions u1 ON u1.OFFER_ID = t0.id
WHERE u1.current_version = true
AND u1.current_version = true
ORDER BY t0.id
) a
WHERE rownum <= 10
) ;
Second one :
SELECT t0.OFFER_ID c0,
t0.id c1,
...
t0.creation c3,
...
t0.current_version c12,
...
t0.OFFER_ID c30,
...
FROM versions t0
WHERE (t0.OFFER_ID) IN (990,991,992,993,994,995,996,997,998,999)
ORDER BY t0.creation;
Question : What do I need to change to get the expected SQL ?
Thank you very much for help
Versions used :
ebean 7.6.1 from play 2.5.14
I found a walk-around:
Instead of
List<Offer> offers = query.fetch("versions")
.where()
.eq("versions.currentVersion", true)
.orderBy("versions.creation desc nulls last")
.setFirstRow(0)
.setMaxRows(10)
.findPagedList().getList();
I've found :
List<Offer> offers = query.fetch("versions")
.where()
.eq("versions.currentVersion", true)
.orderBy("u1.creation desc") // <-- line with the change
.setFirstRow(0)
.setMaxRows(10)
.findPagedList().getList();
I make sure that the join between offer and versions is made only once and than assume that version join alias will be u1.
At least, it's doning the job.
Bye
Having this Entity
#Table(keyspace = KEYSPACE)
public class CE_TimeSeries extends Entity implements TimeSeriesPoint{
#PartitionKey(1)
private String typeId;
#ClusteringColumn(value=1, asc=true)
private String userId;
#ClusteringColumn(value=2, asc=true)
private Date startDate;
#Column
private Date endDate;
#Column
private int groupInterval;
#Column
private int interval;
}
This CQL
SELECT startDate, endDate, groupInterval, interval FROM CE_TimeSeries WHERE typeId
= :typeId and userId = :userId and ( endDate >= :fromDate or ( startDate >=
:fromDate and startDate <= :toDate ) )
Give the Exception :
Caused by: com.datastax.driver.core.exceptions.SyntaxError: line 1:142
mismatched input 'or' expecting ')' (... ( endDate >= :fromDate [or] (...)
While I don't actually see a question here, I'll assume that you are wondering why you are getting an exception. There are two things wrong with your query.
CQL does not allow the use of OR in the WHERE clause.
CQL does not allow parens in the WHERE clause. Plus, not having OR available kind of precludes the need for parens.
The bottom line, is that CQL is not SQL, and the logic you can apply in the WHERE clause is largely dependent on the storage model.
When I generate a table with field LocalDate, it will be mandatory.
#Column(name = "supported_date", nullable = false)
private LocalDate supportedDate;
I don't understand this rule.
It's right there in the #Column annotation: nullable = false means that the column is not nullable, which means that it cannot contain null values, which means that the column is required.
I want to do this query with metamodel but I can't!! I dont know how to do this.
MYSQL QUERY (with this query I want to get all the rows from the Clases table that are teaching in this moment):
SELECT * FROM clases cl
WHERE CURRENT_TIME() BETWEEN
(SELECT ml2.inicio FROM modulos ml2 WHERE cl.modulo_id=ml2.modulo_id ) AND
(SELECT ml2.fin FROM modulos ml2 WHERE cl.modulo_id=ml2.modulo_id) AND
cl.fecha=CURRENT_DATE();
These are my entities:
ENTITY MODULOS
#Entity
#Table(name = "modulos")
public class Modulos implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Basic(optional = false)
#Column(name = "modulo_id")
private Integer moduloId;
#Basic(optional = false)
#Column(name = "inicio")
#Temporal(TemporalType.TIME)
private Date inicio;
#Basic(optional = false)
#Column(name = "fin")
#Temporal(TemporalType.TIME)
private Date fin;
#Basic(optional = false)
#Column(name = "modulo")
private String modulo;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "modulos")
private List<GruposHorarioHasModulos> gruposHorarioHasModulosList;
//getters and setters...
}
ENTITY CLASES
#Entity
#Table(name = "clases")
public class Clases implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Basic(optional = false)
#Column(name = "clase_id")
private Integer claseId;
#Basic(optional = false)
#Column(name = "aula")
private String aula;
#Basic(optional = false)
#Column(name = "fusion")
private boolean fusion = false;
#Basic(optional = false)
#Column(name = "clase_numero")
private Integer claseNumero;
#Basic(optional = false)
#Column(name = "clase_impartida")
private boolean claseImpartida = false;
#JoinColumn(name = "modulo_id", referencedColumnName = "modulo_id")
#ManyToOne(optional = false)
private Modulos modulos;
//getters and setters...
}
I have this:
EntityManager em1 = Persistence.createEntityManagerFactory("myPU").createEntityManager();
CriteriaBuilder cb = em1.getCriteriaBuilder();
CriteriaQuery cq = cb.createQuery();
Root<Clases> root = cq.from(Clases.class);
cq.select(root.get(Clases_.claseId));
Subquery<Date> sqOne = cq.subquery(Date.class);
Root<Modulos> root2 = sqOne.from(Modulos.class);
sqOne.select(root2.get(Modulos_.inicio));
Subquery<Date> horaInicio = sqOne.select(root2.get(Modulos_.inicio)).where(
cb.equal(
root2.get(Modulos_.moduloId),
root.get(Clases_.modulos).get(Modulos_.moduloId)
)
);
Subquery<Date> sqTwo = cq.subquery(Date.class);
Root<Modulos> root3 = sqTwo.from(Modulos.class);
Subquery<Date> horaFin = sqTwo.select(root3.get(Modulos_.fin)).where(
cb.equal(
root3.get(Modulos_.moduloId),
root.get(Clases_.modulos).get(Modulos_.moduloId)
)
);
cq.where(cb.between(cb.currentTime(), horaInicio, horaFin));
em1.createQuery(cq).getResultList();
This code gives me the following exception:
Exception in thread "main" java.lang.ClassCastException:
org.eclipse.persistence.internal.jpa.querydef.SubQueryImpl cannot be
cast to org.eclipse.persistence.internal.jpa.querydef.ExpressionImpl
If i change the where clause for this one...
cq.where(cb.between(cb.currentTime(), new Date(), new Date()));
... it works but without my Subquery, then i can see the error came from my subquery, but I don't know why, if I change the where clause for this one...
cq.where(cb.greaterThan(cb.currentTime(), horaInicio));
... I get this:
SELECT t0.clase_id FROM clases t0, clases t1 WHERE (CURRENT_TIME > (SELECT t2.inicio FROM modulos t3, modulos t2 WHERE ((t2.modulo_id = t3.modulo_id) AND (t3.modulo_id = t0.modulo_id))))
I can see the problem are the 2 subqueries in the between clause.
Please I need help with this, I spent 2 weeks looking for an answer but... nothing... help.
I'm using JPA 2.0 with Netbeans and EclipseLink with metamodel generator and Java 6.
I want to do it with metamodels and criteriasbuilder and criteriasquerys
As you can see i need to do a subquery in the where clause and in that where clause I need to do a between where each parameter have a subquery, like this:
SELECT * FROM X WHERE CURRENT_TIME BETWEEN **MY_SUBQUERY_ONE** AND **MY_SUBQUERY_TWO**
Abit late answer but..
Subquery<Date> sqOne = cq.subquery(Date.class);
Root<Modulos> root2 = sqOne.from(Modulos.class);
sqOne.select(root2.get(Modulos_.inicio));
Subquery<Date> horaInicio = sqOne.select(root2.get(Modulos_.inicio)).where(
cb.equal(
root2.get(Modulos_.moduloId),
root.get(Clases_.modulos).get(Modulos_.moduloId)
)
);
Not sure what you are trying to do here, and it might or might not be related to your error. You create sqOne and make a selection. Then you redo the selection, replacing the previous one and copy the result to horaInicio. What is the purpose of this? You might aswell skip sqOne.select(root2.get(Modulos_.inicio)); and keep using sqOne instead of horaInicio.
Also, I'm not sure you can mix and match Roots created from different queries.