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Pobieranie numeru wiersza z określonej grupy wierszy za pomocą samo łączenia w JPA

2016-03-12 28 views
6

Otrzymano tabelę o nazwie rating w bazie danych MySQL.Pobieranie numeru wiersza z określonej grupy wierszy za pomocą samo łączenia w JPA

+-------------+---------------------+------+-----+---------+----------------+ 
| Field  | Type    | Null | Key | Default | Extra   | 
+-------------+---------------------+------+-----+---------+----------------+ 
| rating_id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | 
| prod_id  | bigint(20) unsigned | YES | MUL | NULL |    | 
| rating_num | int(10) unsigned | YES |  | NULL |    | 
| ip_address | varchar(45)   | YES |  | NULL |    | 
| row_version | bigint(20) unsigned | NO |  | 0  |    | 
+-------------+---------------------+------+-----+---------+----------------+

Potrzebuję pobrać numer wiersza z grupy wierszy w tej tabeli. W Oracle funkcja okna row_number() jest ratownicza.

SELECT row_num 
    FROM (SELECT row_number() over (PARTITION BY prod_id ORDER BY rating_id DESC) 
     AS prod_id, rating_id, row_num FROM rating) 
WHERE rating_id=? AND prod_id = ?;

Jednak ani JPA, ani MySQL nie obsługuje funkcji okna. W związku z tym można zastosować następujące różne instrukcje SQL (self join based on prod_id).

SELECT a.prod_id, a.rating_id, count(*) as row_number 
FROM rating a 
INNER JOIN rating b ON a.prod_id = b.prod_id AND a.rating_id <= b.rating_id 
GROUP BY a.prod_id, a.rating_id 
ORDER BY a.prod_id, a.rating_id DESC

Instrukcja zwraca następujący zestaw wyników.

+---------+-----------+------------+ 
| prod_id | rating_id | row_number | 
+---------+-----------+------------+ 
|  7 |  16 |   1 | 
|  7 |   3 |   2 | 
+---------+-----------+------------+ 
|  8 |   8 |   1 | 
|  8 |   1 |   2 | 
+---------+-----------+------------+ 
|  9 |  15 |   1 | 
|  9 |  14 |   2 | 
|  9 |   5 |   3 | 
+---------+-----------+------------+ 
|  10 |  11 |   1 | 
|  10 |  10 |   2 | 
|  10 |   9 |   3 | 
|  10 |   7 |   4 | 
|  10 |   6 |   5 | 
|  10 |   2 |   6 | 
+---------+-----------+------------+ 
|  16 |  13 |   1 | 
|  16 |  12 |   2 | 
|  16 |   4 |   3 | 
+---------+-----------+------------+

numer wiersza związane z daną grupą produktów można uzyskać z powyższym zestawie wyników na podstawie rating_id (klucz główny) za pomocą dodatkowego warunku w sprzężeniu. Zapytanie może teraz zostać zakończone w pełni w następujący sposób.

SELECT a.prod_id, a.rating_id, count(*) as row_number 
FROM rating a 
INNER JOIN rating b ON a.prod_id = b.prod_id AND a.rating_id <= b.rating_id 
AND a.rating_id=? 
GROUP BY a.prod_id, a.rating_id 
ORDER BY a.prod_id, a.rating_id DESC

Jak oczywiste, liczba wierszy konkretnej grupy produktów mogą być wybrane z trzeciej kolumnie (row_number) zbioru wyników (który będzie zawsze tylko jeden rząd).

Sfinalizowane zapytanie w WZP jest jednak nadal kłopotliwe. Poniższe zapytanie o kryteria jest niewystarczające do wygenerowania powyższej instrukcji SQL.

CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); 
CriteriaQuery<Tuple> criteriaQuery = criteriaBuilder.createTupleQuery(); 
Root<Rating> root = criteriaQuery.from(entityManager.getMetamodel().entity(Rating.class)); 
criteriaQuery.multiselect(root.get(Rating_.product).get(Product_.prodId), root.get(Rating_.ratingId), criteriaBuilder.count(root)); 

Join<Rating, Rating> join = root.join(Rating_.rating, JoinType.INNER).on(criteriaBuilder.equal(root, rating)); 
criteriaQuery.where(criteriaBuilder.lessThanOrEqualTo(root.get(Rating_.ratingId), join.get(Rating_.ratingId))); 
criteriaQuery.groupBy(root.get(Rating_.product).get(Product_.prodId), root.get(Rating_.ratingId)); 
criteriaQuery.orderBy(criteriaBuilder.desc(root.get(Rating_.product).get(Product_.prodId)), criteriaBuilder.desc(root.get(Rating_.ratingId))); 

List<Tuple> list = entityManager.createQuery(criteriaQuery).getResultList(); 
Long rowNumber = list == null || list.isEmpty() ? 0L : list.get(0).get(2, Long.class);

JPQL odpowiadający powyższych kryteriów zapytania:

SELECT a.product.prodId, a.ratingId, COUNT(a) AS row_number 
FROM Rating a INNER JOIN a.rating b ON a.ratingId=:ratingId 
WHERE a.ratingId <= b.ratingId 
GROUP BY a.product.prodId, a.ratingId 
ORDER BY a.product.prodId, a.ratingId DESC

Oba powyższe zapytań SQL generuje następujące oświadczenie.

select 
    rating0_.`prod_id` as col_0_0_, 
    rating0_.`rating_id` as col_1_0_, 
    count(rating0_.`rating_id`) as col_2_0_ 
from 
    `jboss_projectdb`.`rating` rating0_ 
inner join 
    `jboss_projectdb`.`rating` rating1_ 
     on rating0_.`prod_id`=rating1_.`rating_id` 
     and (
      rating0_.`rating_id`=? 
     ) 
where 
    rating0_.`rating_id`<=rating1_.`rating_id` 
group by 
    rating0_.`prod_id` , 
    rating0_.`rating_id` 
order by 
    rating0_.`prod_id` desc, 
    rating0_.`rating_id` desc

Zwróć uwagę na warunek łączenia w wygenerowanym wyciągu.

on rating0_.`prod_id`=rating1_.`rating_id`

Należy jednak

on rating0_.`prod_id`=rating1_.`prod_id`

Więc istota pytanie jest jak własny dołączyć tabelę rating oparciu o prod_id (która jest klucz obcy)?

Samo przyłączenia związek w jednostce Rating została określona jak następuje.

@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "prod_id", insertable = false, updatable = false) 
private Rating rating; 

@OneToMany(fetch = FetchType.LAZY, mappedBy = "rating") 
private List<Rating> ratingList;

Nie jestem zainteresowany użyciem poniższej instrukcji specyficznej dla MySQL w celu pobrania numeru wiersza z określonej grupy wierszy.

SELECT 
    row_num 
FROM 
    (SELECT @row_num := @row_num + 1 AS row_num, tbl.rating_id 
    FROM 
     rating tbl, (SELECT @row_num := 0) t 
    WHERE 
     tbl.prod_id=? 
    ORDER BY 
     tbl.rating_id DESC) t 
    WHERE 
     rating_id = ?

Aktualizacja:

Jeżeli związek zmienia się jak poniżej,

@JoinColumn(name = "prod_id", referencedColumnName = "prod_id", insertable = false, updatable = false) 
@ManyToOne(fetch = FetchType.LAZY) 
private Rating rating; 

@JoinColumn(name = "prod_id", referencedColumnName = "prod_id") 
@OneToMany(fetch = FetchType.LAZY) 
private List<Rating> ratingList;

Hibernate rzuca następujący wyjątek.

16:43:52,609 WARNING [javax.enterprise.resource.webcontainer.jsf.lifecycle] (default task-18) javax.persistence.PersistenceException: org.hibernate.HibernateException: More than one row with the given identifier was found: entity.Rating[ratingId=null], for class: entity.Rating: service.app.exception.impl.DatabaseException: javax.persistence.PersistenceException: org.hibernate.HibernateException: More than one row with the given identifier was found: entity.Rating[ratingId=null], for class: entity.Rating 
    at service.ejb.interceptors.ExceptionInterceptor.handle(ExceptionInterceptor.java:32) 
    at sun.reflect.GeneratedMethodAccessor398.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:497) 
    at org.jboss.as.ee.component.ManagedReferenceLifecycleMethodInterceptor.processInvocation(ManagedReferenceLifecycleMethodInterceptor.java:89) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.jpa.interceptor.SBInvocationInterceptor.processInvocation(SBInvocationInterceptor.java:47) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437) 
    at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:64) 
    at org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:83) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) 
    at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:52) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:275) 
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:327) 
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:239) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.component.invocationmetrics.WaitTimeInterceptor.processInvocation(WaitTimeInterceptor.java:43) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.security.AuthorizationInterceptor.processInvocation(AuthorizationInterceptor.java:138) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:100) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:66) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:54) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:64) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356) 
    at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:636) 
    at org.jboss.invocation.AccessCheckingInterceptor.processInvocation(AccessCheckingInterceptor.java:61) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356) 
    at org.jboss.invocation.PrivilegedWithCombinerInterceptor.processInvocation(PrivilegedWithCombinerInterceptor.java:80) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) 
    at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:195) 
    at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:185) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) 
    at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:73) 
    at shareable.bean.ShareableService$$$view330.findRatingById(Unknown Source) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:497) 
    at org.jboss.weld.util.reflection.Reflections.invokeAndUnwrap(Reflections.java:436) 
    at org.jboss.weld.bean.proxy.EnterpriseBeanProxyMethodHandler.invoke(EnterpriseBeanProxyMethodHandler.java:127) 
    at org.jboss.weld.bean.proxy.EnterpriseTargetBeanInstance.invoke(EnterpriseTargetBeanInstance.java:56) 
    at org.jboss.weld.bean.proxy.InjectionPointPropagatingEnterpriseTargetBeanInstance.invoke(InjectionPointPropagatingEnterpriseTargetBeanInstance.java:67) 
    at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:100) 
    at shareable.bean.ShareableService$614900122$Proxy$_$$_Weld$EnterpriseProxy$.findRatingById(Unknown Source) 
    at converter.RatingConverter.getAsObject(RatingConverter.java:41) 
    at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:171) 
    at javax.faces.component.UIViewParameter.getConvertedValue(UIViewParameter.java:437) 
    at javax.faces.component.UIInput.validate(UIInput.java:975) 
    at javax.faces.component.UIInput.executeValidate(UIInput.java:1248) 
    at javax.faces.component.UIInput.processValidators(UIInput.java:712) 
    at javax.faces.component.UIViewParameter.processValidators(UIViewParameter.java:278) 
    at org.omnifaces.component.input.ViewParam.processValidators(ViewParam.java:120) 
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1261) 
    at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1261) 
    at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1195) 
    at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658) 
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) 
    at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:78) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:129) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.omnifaces.facesviews.FacesViewsForwardingFilter.filterExtensionLess(FacesViewsForwardingFilter.java:128) 
    at org.omnifaces.facesviews.FacesViewsForwardingFilter.doFilter(FacesViewsForwardingFilter.java:89) 
    at org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:108) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at filter.NoCacheFilter.doFilter(NoCacheFilter.java:33) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at org.omnifaces.filter.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:122) 
    at org.omnifaces.filter.HttpFilter.doFilter(HttpFilter.java:108) 
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) 
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) 
    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) 
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) 
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) 
    at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) 
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) 
    at io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
    at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51) 
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) 
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) 
    at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:56) 
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) 
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) 
    at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50) 
    at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
    at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) 
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284) 
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263) 
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81) 
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174) 
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202) 
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: javax.persistence.PersistenceException: org.hibernate.HibernateException: More than one row with the given identifier was found: entity.Rating[ratingId=null], for class: entity.Rating 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1692) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1602) 
    at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:492) 
    at org.hibernate.jpa.criteria.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:50) 
    at shareable.bean.ShareableBean.findRatingById(ShareableBean.java:472) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:497) 
    at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437) 
    at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:82) 
    at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:93) 
    at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63) 
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340) 
    at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437) 
    at service.ejb.interceptors.ExceptionInterceptor.handle(ExceptionInterceptor.java:22) 
    ... 133 more 
Caused by: org.hibernate.HibernateException: More than one row with the given identifier was found: entity.Rating[ratingId=null], for class: entity.Rating 
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:86) 
    at org.hibernate.loader.entity.EntityLoader.loadByUniqueKey(EntityLoader.java:143) 
    at org.hibernate.persister.entity.AbstractEntityPersister.loadByUniqueKey(AbstractEntityPersister.java:2146) 
    at org.hibernate.type.EntityType.loadByUniqueKey(EntityType.java:685) 
    at org.hibernate.type.EntityType.resolve(EntityType.java:427) 
    at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:151) 
    at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:125) 
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1132) 
    at org.hibernate.loader.Loader.processResultSet(Loader.java:992) 
    at org.hibernate.loader.Loader.doQuery(Loader.java:930) 
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336) 
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:306) 
    at org.hibernate.loader.Loader.loadEntity(Loader.java:2197) 
    at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:60) 
    at org.hibernate.loader.entity.EntityLoader.loadByUniqueKey(EntityLoader.java:143) 
    at org.hibernate.persister.entity.AbstractEntityPersister.loadByUniqueKey(AbstractEntityPersister.java:2146) 
    at org.hibernate.type.EntityType.loadByUniqueKey(EntityType.java:685) 
    at org.hibernate.type.EntityType.resolve(EntityType.java:427) 
    at org.hibernate.engine.internal.TwoPhaseLoad.doInitializeEntity(TwoPhaseLoad.java:151) 
    at org.hibernate.engine.internal.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:125) 
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1132) 
    at org.hibernate.loader.Loader.processResultSet(Loader.java:992) 
    at org.hibernate.loader.Loader.doQuery(Loader.java:930) 
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336) 
    at org.hibernate.loader.Loader.doList(Loader.java:2610) 
    at org.hibernate.loader.Loader.doList(Loader.java:2593) 
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2422) 
    at org.hibernate.loader.Loader.list(Loader.java:2417) 
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501) 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371) 
    at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216) 
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1339) 
    at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87) 
    at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606) 
    at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:483) 
    ... 148 more

criteriaQuery.multiselect(...).distinct(true); nie pomaga. Nie sądzę, że istnieje sposób na obejście problemu.

Źródło

2016-03-12 Tiny

+0

Dlaczego nie [natywne zapytanie] (http://stackoverflow.com/questions/2520357/mysql-get-row-number-on-select)? –

+0

Aby wykorzystać model obiektowy, którego dotyczy, użycie natywnych zapytań powinno być zminimalizowane w jak największym stopniu. – Tiny

Odpowiedz

0

Hibernate robi wszystko dokładnie tak, jak nakazują to twoje mapowania. Konstrukcja FROM Rating a INNER JOIN a.rating b oznacza dołączenie klucza podstawowego jednej oceny z kluczem obcym (odnosząc to PK) do innego klucza.

Aby osiągnąć to, co chcesz ze swoimi odwzorowań trzeba wyraźnie skonstruować warunku przyłączenia, więc from i where klauzule swojej JPQL mógłby wyglądać następująco:

SELECT ... 
FROM Rating a, Rating b 
WHERE a.rating.id = b.rating.id 
    AND a.ratingId = :ratingId 
    AND a.ratingId <= b.ratingId 
GROUP BY ... 
ORDER BY ...

rating.id jest tłumaczona na prod_id kolumnie.

Źródło

2016-03-14 21:18:01

+0

Widzę Hibernacja produkująca połączenie krzyżowe między łączonymi tabelami. – Tiny

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@Tiny Tak, czy to nie jest to czego chcesz? Aby samodzielnie dołączyć do tabeli na 'prod_id'? –

+0

'SELECT * FROM table_a a, table_b b GDZIE a.id = b.id' jest uważane za niejawne sprzężenie wewnętrzne w RDBMS. Jest to równoważne 'WYBIERZ * Z tabeli_a a WEJŚCIE WEWNĘTRZNE table_b b ON a.id = b.id' (ANSI). Hibernacja ma w tym przypadku wywołać sprzężenie wewnętrzne. Wygląda na to, że jest to błąd Hibernacji. – Tiny

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