我收到以下异常:-
[13, 13] 算术表达式中缺少左边的表达式。 [14, 14] 算术表达式中缺少正确的表达式。
请帮我分析一下问题
附言如果我用 select * from student s 替换我代码中的上述查询，它工作正常。
Exception Description: Syntax error parsing [select count(*) from Student s ].
[13, 13] The left expression is missing from the arithmetic expression.
[14, 14] The right expression is missing from the arithmetic expression.
java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager:
Exception Description: Syntax error parsing [select count(*) from Student s ].
[13, 13] The left expression is missing from the arithmetic expression.
[14, 14] The right expression is missing from the arithmetic expression.
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1605)
at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:334)
at com.sun.proxy.$Proxy84.createQuery(Unknown Source)
at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:257)
at com.sun.proxy.$Proxy84.createQuery(Unknown Source)
at com.core.commons.domain.util.reference.repository.AbstractSearchCriteriaSupportRepositoryImpl.createQuery(AbstractSearchCriteriaSupportRepositoryImpl.java:146)
at com.core.commons.domain.util.reference.repository.AbstractSearchCriteriaSupportRepositoryImpl.getTotalRecordsCount(AbstractSearchCriteriaSupportRepositoryImpl.java:117)
at com.core.commons.domain.util.reference.repository.AbstractSearchCriteriaSupportRepositoryImpl.findBy(AbstractSearchCriteriaSupportRepositoryImpl.java:48)
at com.wfm.ft.service.FinancialTransactionServiceImpl.getAllBillingAccounts(FinancialTransactionServiceImpl.java:157)
at com.wfm.ft.web.FTEntryController.getAllBillingAccounts(FTEntryController.java:42)
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.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilter(WebRequestTraceFilter.java:115)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextFilterConfiguration$1.doFilterInternal(EndpointWebMvcAutoConfiguration.java:137)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration$MetricsFilter.doFilterInternal(MetricFilterAutoConfiguration.java:85)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.AssociatedPartiesCallChecker.doFilter(AssociatedPartiesCallChecker.java:64)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.AdminUrlCallChecker.doFilter(AdminUrlCallChecker.java:53)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.BEMatcherFilter.doFilter(BEMatcherFilter.java:68)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.HttpCreateProcessContextFilter.doFilter(HttpCreateProcessContextFilter.java:44)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.HttpSecuredAccessDataExtractor.doFilter(HttpSecuredAccessDataExtractor.java:89)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.CreateSystemUserContextFilter.doFilter(CreateSystemUserContextFilter.java:69)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.web.SimpleCORSFilter.verifyRequestAndProcess(SimpleCORSFilter.java:183)
at com.core.commons.service.web.SimpleCORSFilter.doFilter(SimpleCORSFilter.java:83)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.TenantProcessContextFilter.doFilter(TenantProcessContextFilter.java:51)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Unknown Source)
Caused by: Exception [EclipseLink-0] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Syntax error parsing [select count(*) from Student s ].
[13, 13] The left expression is missing from the arithmetic expression.
[14, 14] The right expression is missing from the arithmetic expression.
at org.eclipse.persistence.internal.jpa.jpql.HermesParser.buildException(HermesParser.java:155)
at org.eclipse.persistence.internal.jpa.jpql.HermesParser.validate(HermesParser.java:334)
at org.eclipse.persistence.internal.jpa.jpql.HermesParser.populateQueryImp(HermesParser.java:278)
at org.eclipse.persistence.internal.jpa.jpql.HermesParser.buildQuery(HermesParser.java:163)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:142)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:116)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:102)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:86)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1603)
... 84 more
更新 1
Exception Description: Problem compiling [select count(ax) from ( select gle.glAccount.accountId as accountId, gle.glAccount.qualifier.name as accountName, gle.glAccount.accountType as accountType,gle.amount.currency.symbol as symbol ,sum(gle.amount.value * gle.postingTypeValue) as totalSum from GLEntry gle group by gle.glAccount.id, gle.glAccount.qualifier.name, gle.glAccount.accountType, gle.amount.currency.symbol,gle.glAccount.id ) ax].
[22, 399] '(select gle.glAccount.accountId as accountId, gle.glAccount.qualifier.name as accountName, gle.glAccount.accountType as accountType, gle.amount.currency.symbol as symbol, sum(gle.amount.value * gle.postingTypeValue) as totalSum from GLEntry gle group by gle.glAccount.id, gle.glAccount.qualifier.name, gle.glAccount.accountType, gle.amount.currency.symbol, gle.glAccount.id) ax' cannot be the first declaration of the FROM clause.
java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager:
Exception Description: Problem compiling [select count(ax) from ( select gle.glAccount.accountId as accountId, gle.glAccount.qualifier.name as accountName, gle.glAccount.accountType as accountType,gle.amount.currency.symbol as symbol ,sum(gle.amount.value * gle.postingTypeValue) as totalSum from GLEntry gle group by gle.glAccount.id, gle.glAccount.qualifier.name, gle.glAccount.accountType, gle.amount.currency.symbol,gle.glAccount.id ) ax].
[22, 399] '(select gle.glAccount.accountId as accountId, gle.glAccount.qualifier.name as accountName, gle.glAccount.accountType as accountType, gle.amount.currency.symbol as symbol, sum(gle.amount.value * gle.postingTypeValue) as totalSum from GLEntry gle group by gle.glAccount.id, gle.glAccount.qualifier.name, gle.glAccount.accountType, gle.amount.currency.symbol, gle.glAccount.id) ax' cannot be the first declaration of the FROM clause.
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1605)
at sun.reflect.GeneratedMethodAccessor29.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:334)
at com.sun.proxy.$Proxy84.createQuery(Unknown Source)
at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:257)
at com.sun.proxy.$Proxy84.createQuery(Unknown Source)
at com.core.commons.domain.util.reference.repository.AbstractSearchCriteriaSupportRepositoryImpl.createQuery(AbstractSearchCriteriaSupportRepositoryImpl.java:134)
at com.core.commons.domain.util.reference.repository.AbstractSearchCriteriaSupportRepositoryImpl.getTotalRecordsCount(AbstractSearchCriteriaSupportRepositoryImpl.java:109)
at com.core.commons.domain.util.reference.repository.AbstractSearchCriteriaSupportRepositoryImpl.findBy(AbstractSearchCriteriaSupportRepositoryImpl.java:48)
at com..ft.service.FinancialTransactionServiceImpl.getAllBillingAccounts(FinancialTransactionServiceImpl.java:157)
at com..ft.web.FTEntryController.getAllBillingAccounts(FTEntryController.java:42)
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.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilter(WebRequestTraceFilter.java:115)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextFilterConfiguration$1.doFilterInternal(EndpointWebMvcAutoConfiguration.java:137)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration$MetricsFilter.doFilterInternal(MetricFilterAutoConfiguration.java:85)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.AssociatedPartiesCallChecker.doFilter(AssociatedPartiesCallChecker.java:64)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.AdminUrlCallChecker.doFilter(AdminUrlCallChecker.java:53)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.BEMatcherFilter.doFilter(BEMatcherFilter.java:68)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.HttpCreateProcessContextFilter.doFilter(HttpCreateProcessContextFilter.java:44)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.HttpSecuredAccessDataExtractor.doFilter(HttpSecuredAccessDataExtractor.java:89)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.CreateSystemUserContextFilter.doFilter(CreateSystemUserContextFilter.java:80)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.web.SimpleCORSFilter.verifyRequestAndProcess(SimpleCORSFilter.java:183)
at com.core.commons.service.web.SimpleCORSFilter.doFilter(SimpleCORSFilter.java:83)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at com.core.commons.service.security.filter.TenantProcessContextFilter.doFilter(TenantProcessContextFilter.java:51)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Unknown Source)
Caused by: Exception [EclipseLink-0] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Problem compiling [select count(ax) from ( select gle.glAccount.accountId as accountId, gle.glAccount.qualifier.name as accountName, gle.glAccount.accountType as accountType,gle.amount.currency.symbol as symbol ,sum(gle.amount.value * gle.postingTypeValue) as totalSum from GLEntry gle group by gle.glAccount.id, gle.glAccount.qualifier.name, gle.glAccount.accountType, gle.amount.currency.symbol,gle.glAccount.id ) ax].
[22, 399] '(select gle.glAccount.accountId as accountId, gle.glAccount.qualifier.name as accountName, gle.glAccount.accountType as accountType, gle.amount.currency.symbol as symbol, sum(gle.amount.value * gle.postingTypeValue) as totalSum from GLEntry gle group by gle.glAccount.id, gle.glAccount.qualifier.name, gle.glAccount.accountType, gle.amount.currency.symbol, gle.glAccount.id) ax' cannot be the first declaration of the FROM clause.
at org.eclipse.persistence.internal.jpa.jpql.HermesParser.buildException(HermesParser.java:155)
at org.eclipse.persistence.internal.jpa.jpql.HermesParser.validate(HermesParser.java:347)
at org.eclipse.persistence.internal.jpa.jpql.HermesParser.populateQueryImp(HermesParser.java:278)
at org.eclipse.persistence.internal.jpa.jpql.HermesParser.buildQuery(HermesParser.java:163)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:142)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.buildEJBQLDatabaseQuery(EJBQueryImpl.java:116)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:102)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.<init>(EJBQueryImpl.java:86)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1603)
... 84 more
最佳答案
尝试使用从 Student s 中选择计数。
关于java - EclipseLink 查询 - 从学生中选择计数(*)不工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28305963/
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尝试在我的RoR应用程序中实现计数器缓存列时出现错误Unknownkey(s):counter_cache。我在这个问题中实现了模型关联:Modelassociationquestion这是我的迁移:classAddVideoVotesCountToVideos0Video.reset_column_informationVideo.find(:all).eachdo|p|p.update_attributes:videos_votes_count,p.video_votes.lengthendenddefself.downremove_column:videos,:video_vot
我正在尝试使用boilerpipe来自JRuby。我看过guide从JRuby调用Java，并成功地将它与另一个Java包一起使用，但无法弄清楚为什么同样的东西不能用于boilerpipe。我正在尝试基本上从JRuby中执行与此Java等效的操作:URLurl=newURL("http://www.example.com/some-location/index.html");Stringtext=ArticleExtractor.INSTANCE.getText(url);在JRuby中试过这个:require'java'url=java.net.URL.new("http://www