スプリングデータjpaでjoin jpaを使用する場合の違いは何ですか

私はスプリングデータjpaで問題を起こしています。どうしてか分かりません？理由は何ですか？スプリングデータjpaでjoin jpaを使用する場合の違いは何ですか

問題：私は2台持っている：私のコードでは 1. AccessPointDb

@Entity 
@Table(name = "access_point") 
public class AccessPointDb implements Serializable { 

private static final long serialVersionUID = 1L; 

@Id 
@GeneratedValue 
@Column(name = "access_point_id", unique = true, nullable = false) 
private Long accessPointId; 

@Column(name = "ap_mac") 
private String apMac; 

@Column(name = "zone_id") 
private Long zoneId; 

@Column(name = "description") 
private String description; 

@Column(name = "created_date") 
@Temporal(TemporalType.TIMESTAMP) 
private Date createdDate; 

@Column(name = "created_by") 
private Long createdBy; 

@Column(name = "updated_date") 
@Temporal(TemporalType.TIMESTAMP) 
private Date updatedDate; 

@Column(name = "updated_by") 
private Long updatedBy; 


public AccessPointDb() { 
    super(); 
} 

public Long getAccessPointId() { 
    return accessPointId; 
} 

public void setAccessPointId(Long accessPointId) { 
    this.accessPointId = accessPointId; 
} 

public String getApMac() { 
    return apMac; 
} 

public void setApMac(String apMac) { 
    this.apMac = apMac; 
} 

public Long getZoneId() { 
    return zoneId; 
} 

public void setZoneId(Long zoneId) { 
    this.zoneId = zoneId; 
} 

public String getDescription() { 
    return description; 
} 

public void setDescription(String description) { 
    this.description = description; 
} 



public Date getCreatedDate() { 
    return createdDate; 
} 

public void setCreatedDate(Date createdDate) { 
    this.createdDate = createdDate; 
} 

public Long getCreatedBy() { 
    return createdBy; 
} 

public void setCreatedBy(Long createdBy) { 
    this.createdBy = createdBy; 
} 

public Date getUpdatedDate() { 
    return updatedDate; 
} 

public void setUpdatedDate(Date updatedDate) { 
    this.updatedDate = updatedDate; 
} 

public Long getUpdatedBy() { 
    return updatedBy; 
} 

public void setUpdatedBy(Long updatedBy) { 
    this.updatedBy = updatedBy; 
} 

}

と
2 ZoneDb

@Entity 
@Table(name = "zone") 

public class ZoneDb extends BaseEntity implements Serializable { 

private static final long serialVersionUID = 1L; 

@Id 
@GeneratedValue 
@Column(name = "zone_id", unique = true, nullable = false) 
private Long zoneId; 

@Column(name = "zone_name") 
private String zoneName; 

@Column(name = "description") 
private String description; 

public ZoneDb() { 
    super(); 
} 

public Long getZoneId() { 
    return zoneId; 
} 

public void setZoneId(Long zoneId) { 
    this.zoneId = zoneId; 
} 

public String getZoneName() { 
    return zoneName; 
} 

public void setZoneName(String zoneName) { 
    this.zoneName = zoneName; 
} 

public String getDescription() { 
    return description; 
} 

public void setDescription(String description) { 
    this.description = description; 
} 

}

を。私は上記の2つのテーブルに参加したい：私はコードを使用しています："SELECT a.accessPointId, z.zoneName FROM AccessPointDb AS a LEFT JOIN ZoneDb AS z ON z.zoneId = z.zoneId"; とクエリを作成します。query = em.createQuery(stmt, persistentClass);

をしかし、私はエラーが表示さ：

antlr.SemanticException: Path expected for join! 

org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.hql.internal.ast.QuerySyntaxException: Path expected for join! [SELECT a FROM com.sbd.cms.data.entities.AccessPointDb AS a LEFT JOIN ZoneDb AS z ON z.zoneId = z.zoneId WHERE 1=1 ]; nested exception is java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: Path expected for join! [SELECT a FROM com.sbd.cms.data.entities.AccessPointDb AS a LEFT JOIN ZoneDb AS z ON z.zoneId = z.zoneId WHERE 1=1 ] 
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:384) 
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:246) 
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:491) 
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59) 
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213) 
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656) 
    at com.sbd.cms.data.repository.implement.AccessPointRepository$$EnhancerBySpringCGLIB$$a5b2c11f.search(<generated>) 
    at com.sbd.cms.biz.accessPoint.AccessPointBusinessImplement.search(AccessPointBusinessImplement.java:42) 
    at com.sbd.cms.web.api.controller.AccessPointController.search(AccessPointController.java:33) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) 
    at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:96) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) 
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) 
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) 
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) 
    at org.springframework.boot.web.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:115) 
    at org.springframework.boot.web.support.ErrorPageFilter.access$000(ErrorPageFilter.java:59) 
    at org.springframework.boot.web.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:90) 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
    at org.springframework.boot.web.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:108) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) 
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) 
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) 
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798) 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434) 
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
    at java.lang.Thread.run(Unknown Source) 
Caused by: java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: Path expected for join! [SELECT a FROM com.sbd.cms.data.entities.AccessPointDb AS a LEFT JOIN ZoneDb AS z ON z.zoneId = z.zoneId WHERE 1=1 ] 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1679) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1602) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1608) 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:313) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:347) 
    at com.sun.proxy.$Proxy93.createQuery(Unknown Source) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:298) 
    at com.sun.proxy.$Proxy93.createQuery(Unknown Source) 
    at com.sbd.cms.data.repository.implement.GenericRepositoryImplement.findByQuery(GenericRepositoryImplement.java:189) 
    at com.sbd.cms.data.repository.implement.GenericRepositoryImplement.pagingCustom(GenericRepositoryImplement.java:64) 
    at com.sbd.cms.data.repository.implement.AccessPointRepository.search(AccessPointRepository.java:56) 
    at com.sbd.cms.data.repository.implement.AccessPointRepository$$FastClassBySpringCGLIB$$9bda46e0.invoke(<generated>) 
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) 
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 
    at org.springframework.dao.support

をしかし、私はなぜか分からないのですか？

次に、テーブルaccessPointDbに1を追加すると、

@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "zoneId") 
private ZoneDb zoneDb;

と私は、クエリ使用して

SELECt a.accessPointId, z.zoneName FROM AccessPointDb AS a LEFT JOIN a.zoneDb AS z ON z.zoneId = z.zoneId

または

SELECt a.accessPointId, z.zoneDb.zoneName FROM AccessPointDb AS a

それは沖です。

しかし、私は上記の方法の違いは何か知りたいですか？

出典

2017-05-01 ngotiensy

JPQL JOINは複数の関係にあります。あなたの最初のものは、関係をまたいではなく、2つの別個のエンティティの間にあります。 JPA仕様を参照し、JPAプロバイダのドキュメント –

@NeilStocktonご意見をお寄せいただきありがとうございます。 – ngotiensy

SELECT a.accessPointId, z.zoneName FROM AccessPointDb AS a LEFT JOIN ZoneDb AS z ON z.zoneId = z.zoneId"

この（クエリ以上）を使用すると、代わりにあなたが実行ネイティブクエリにcreateNativeQueryを使用する必要がありますcreateQueryのEntityManagerの

em.createQuery(stmt, persistentClass);

のcreateQuery方法でそれを使用しているため、それがエラーを与えている、なぜネイティブクエリはthatsのです。

ネイティブクエリ：ネイティブクエリは、実際のSQLクエリ（実際のデータベースオブジェクトを参照）を参照します。これらのクエリは、データベースクライアントを使用してデータベース内で直接実行できるSQL文です。

クエリ：問合せは、一般にDML文（CRUD操作）の実行に使用されるSQLと似た構文を持つJPQL/HQL問合せを参照します。 JPAでは、entityManager.createQuery（）を使用してクエリを作成できます。

出典

2017-05-01 17:55:54

AccessPointDbとZoneDbが2つのエンティティであるため、上記のクエリはnavtiveQueryではありません。 – ngotiensy

@ngotiensy、オハイオ州申し訳ありませんが、@表の注釈が欠落していました。実際には、SELECT a.accessPointId、z.zoneName FROM AccessPointDb LE LEFT JOIN ZoneDb AS z.zoneId = z.zoneId ";およびcreate query：query = em。createQuery（stmt、persistentClass）; 'この時点ではZoneDbに関連付けられていないエンティティAccessPointDbとhql/JPQLがエンティティを処理し、エンティティまたはエンティティを関連付けるか、結合を使用して値のコレクションの要素に関連付けました。あなたのAccessPointDbエンティティは例外をスローします： 'org.hibernate.hql.internal.ast.QuerySyntaxException：パスは結合に必要です！ ' –

あなたの返事に感謝します。しかし、私はここでdiffirentは春のデータですjpaは休止状態で実行されていると思う、それはjpaの標準ではありません。私はelipseリンクで実行するように変更されます。多分それは沖です。 – ngotiensy

スプリングデータjpaでjoin jpaを使用する場合の違いは何ですか

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