来自扩展相同实体的两个实体的休眠查询

【问题标题】：Hibernate query from two entities which are extended same entity来自扩展相同实体的两个实体的休眠查询
【发布时间】：2015-12-02 23:12:48
【问题描述】：

根据我的设计，我创建了扩展同一实体的实体。但有些实体有额外的属性（列）。

我的问题如下：当我为每个实体调用查询时没有问题。但是在一个查询中调用多个表时，就会出现问题。

这个查询很好用：QueryA

Query query = session.getCurrentSession().createQuery("from ExtendedA where title like :title order by pubdate desc ");

但这失败了！ 查询B

Query query = session.getCurrentSession().createQuery("from ExtendedA, ExtendedB where title like :title order by pubdate desc ");

如果我只调用这个没有问题；查询C

Query query = session.getCurrentSession().createQuery("from ExtendedA, ExtendedB");

问题在于使用排序或 (where-) 子句时。

ExtendedA 和ExtendedB 继承自classA，classA 具有pubdate, title 和其他属性。在这种情况下，每个类都应该具有这些属性。一一调用，这些属性（列）是没有问题的。

谁能帮我写一个类似QueryB的查询，

谢谢。

type Exception report

message Request processing failed; nested exception is org.hibernate.exception.ConstraintViolationException: could not extract ResultSet

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.exception.ConstraintViolationException: could not extract ResultSet
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
root cause

org.hibernate.exception.ConstraintViolationException: could not extract ResultSet
    org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:72)
    org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
    org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
    org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
    org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:91)
    org.hibernate.loader.Loader.getResultSet(Loader.java:2066)
    org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1863)
    org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1839)
    org.hibernate.loader.Loader.doQuery(Loader.java:910)
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)
    org.hibernate.loader.Loader.doList(Loader.java:2554)
    org.hibernate.loader.Loader.listUsingQueryCache(Loader.java:2399)
    org.hibernate.loader.Loader.list(Loader.java:2362)
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:497)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)
    org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:236)
    org.hibernate.internal.SessionImpl.list(SessionImpl.java:1264)
    org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
    project.data.dao.general.top.AnnouncementDAOImpl.getAll(AnnouncementDAOImpl.java:47)
    project.data.service.general.top.AnnouncementServiceImpl.getAll(AnnouncementServiceImpl.java:51)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:497)
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:266)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    com.sun.proxy.$Proxy47.getAll(Unknown Source)
    project.endpoint.general.top.AnnouncementEP.getAll(AnnouncementEP.java:35)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:497)
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
root cause

com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'pubdate' in order clause is ambiguous
    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    com.mysql.jdbc.Util.getInstance(Util.java:381)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)
    com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
    com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3491)
    com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3423)
    com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1936)
    com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2060)
    com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2542)
    com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1734)
    com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1885)
    org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93)
    org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:82)
    org.hibernate.loader.Loader.getResultSet(Loader.java:2066)
    org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1863)
    org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1839)
    org.hibernate.loader.Loader.doQuery(Loader.java:910)
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:355)
    org.hibernate.loader.Loader.doList(Loader.java:2554)
    org.hibernate.loader.Loader.listUsingQueryCache(Loader.java:2399)
    org.hibernate.loader.Loader.list(Loader.java:2362)
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:497)
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:387)
    org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:236)
    org.hibernate.internal.SessionImpl.list(SessionImpl.java:1264)
    org.hibernate.internal.QueryImpl.list(QueryImpl.java:103)
    project.data.dao.general.top.AnnouncementDAOImpl.getAll(AnnouncementDAOImpl.java:47)
    project.data.service.general.top.AnnouncementServiceImpl.getAll(AnnouncementServiceImpl.java:51)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:497)
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:266)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    com.sun.proxy.$Proxy47.getAll(Unknown Source)
    project.endpoint.general.top.AnnouncementEP.getAll(AnnouncementEP.java:35)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:497)
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)

【问题讨论】：

  • StackTrace好吗？但我想你需要使用表别名。

标签： java entity-framework hibernate spring-mvc orm


【解决方案1】：

就您使用具有相同属性名称的实体而言，不清楚应该使用哪个实体的属性。例如，您是按 ExtendedA.pubdate 还是 ExtendedB.pubdate 订购？

您必须指定属性和实体如何相互对应。喜欢

Query query = session.getCurrentSession().createQuery("from ExtendedA as a, ExtendedB as b where a.title like :title and b.title like :title order by a.pubdate desc ");

【讨论】：

  • 有没有办法通过发布日期订购。因为他们都有
  • 从 Hibernate 的角度来看，您正在使用两个不同的表，它们具有两组不同的列但具有相同的名称。结果，您将拥有双倍的列数，因此您必须按每个列进行排序。在您的情况下，最好将您的超类标记为实体并为子类进行 JOINED 继承。在这种情况下，您会将所有通用数据存储在超类表中，因此您可以从中选择/排序。然后您可以使用内连接从 ExtendedA、ExtendedB 连接特定数据。
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