那些遇到过的问题

Spring JPA ::没有找到能够从类型转换的转换器

Anj*_*ali 7 spring jpa spring-data spring-data-jpa

我在JPA中使用spring并尝试使用@query和SQL query。来执行查询，并尝试将结果映射到对象。我有不同的实体类并映射到其他dto，因为我不希望所有列。低于错误

找不到能够将[org.springframework.data.jpa.repository.query.AbstractJpaQuery $ TupleConverter $ TupleBackedMap]类型转换为[webapi.dto.StatsDTO]类型的转换器”，

下面是我的存储库界面

public interface UserRepository extends CrudRepository<UserEntity, Long> {
    @Query(value = "select count(type_id) userCount, type_id, modified_at from "
                + "user_campaign_objective where camp_id = ?1 group by objective_type_id,modified_at", nativeQuery = true)

        List<StatsDTO> getStatsDTO(Long camp_id);
}
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以下是StatsDTO。

@Data
@NoArgsConstructor
@AllArgsConstructor
public class StatsDTO {
    private Integer userCount;
    private Byte typeId;
    private Instant modifiedAt;

}
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  1. 如何解决以上问题。
  2. 如果问题无法解决，那么我们可以在没有@query的情况下使用spring data jpa做到这一点吗？怎么样？

编辑：：使用JPQL ::

@Query("select new webapi.campaign.dto.StatsDTO(count(u.objective_type_id),u.objective_type_id,u.modified_at) "
        + "from user_campaign_objective u where u.campaign_id = ?1 group by u.objective_type_id,u.modified_at")
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低于错误

    Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: user_campaign_objective is not mapped [select new webapi.campaign.dto.StatsDTO(count(u.objective_type_id),u.objective_type_id,u.modified_at) from user_campaign_objective u where u.campaign_id = ?1 group by u.objective_type_id,u.modified_at]
    at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:79) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]     
at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:217) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]   at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:141) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]     at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:77) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]     at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:153) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]   
at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:553) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    
at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:662) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]     ... 79 common frames omitted Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: user_campaign_objective is not mapped  
at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:169) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] 
    at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:91) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:79) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    
at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:326) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3706) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3595) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]    
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:720) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]  
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:576) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]   
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:313) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]     
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:261) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]   
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:266) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final] 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:189) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]   ... 85 common frames omitted
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如果使用使用SQL的nativequery出现以下错误

@Query(value = "select count(objective_type_id), objective_type_id, modified_at from "
        + "user_campaign_objective where campaign_id = ?1 group by objective_type_id,modified_at", nativeQuery = true)
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堆栈跟踪

org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap] to type [webapi.campaign.dto.StatsDTO]   
at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:321) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:194) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:174) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.data.repository.query.ResultProcessor$ProjectingConverter.convert(ResultProcessor.java:293) ~[spring-data-commons-2.0.8.RELEASE.jar:2.0.8.RELEASE]   
at org.springframework.data.repository.query.ResultProcessor$ChainingConverter.lambda$and$0(ResultProcessor.java:213) ~[spring-data-commons-2.0.8.RELEASE.jar:2.0.8.RELEASE]    
at org.springframework.data.repository.query.ResultProcessor$ChainingConverter.convert(ResultProcessor.java:224) ~[spring-data-commons-2.0.8.RELEASE.jar:2.0.8.RELEASE]     
at org.springframework.data.repository.query.ResultProcessor.processResult(ResultProcessor.java:152) ~[spring-data-commons-2.0.8.RELEASE.jar:2.0.8.RELEASE]     

at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:141) ~[spring-data-jpa-2.0.8.RELEASE.jar:2.0.8.RELEASE]   
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:125) ~[spring-data-jpa-2.0.8.RELEASE.jar:2.0.8.RELEASE]     at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:590) ~[spring-data-commons-2.0.8.RELEASE.jar:2.0.8.RELEASE]  
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:578) ~[spring-data-commons-2.0.8.RELEASE.jar:2.0.8.RELEASE]    
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59) ~[spring-data-commons-2.0.8.RELEASE.jar:2.0.8.RELEASE]     
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294) ~[spring-tx-5.0.7.RELEASE.jar:5.0.7.RELEASE]     
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.0.7.RELEASE.jar:5.0.7.RELEASE]   
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:135) ~[spring-data-jpa-2.0.8.RELEASE.jar:2.0.8.RELEASE]    
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61) ~[spring-data-commons-2.0.8.RELEASE.jar:2.0.8.RELEASE]  
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]   
at com.sun.proxy.$Proxy138.findByCampaignID(Unknown Source) ~[na:na]    
at waypedia.webapi.campaign.fullymanaged.CampaignCreatorService.campaignStats(CampaignCreatorService.java:477) ~[main/:na]  
at waypedia.webapi.campaign.fullymanaged.CampaignCreatorController.campaignStats(CampaignCreatorController.java:251) ~[main/:na]    
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]  
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]    
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]    
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]  at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]     
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]   
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]     
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661) ~[tomcat-embed-core-8.5.31.jar:8.5.31]  at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]     
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.31.jar:8.5.31]  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.31.jar:8.5.31]   
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]    
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]   
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]   
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]    
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]    
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]   
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:158) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]    
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]   
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]   
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]     
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]    
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]  
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]     at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.0.6.RELEASE.jar:5.0.6.RELEASE]     
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]     
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]    
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]     
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.0.

Dav*_*ham 21

您可以使用构造函数表达式 JPQL 查询，您的查询如下所示：

select new StatsDTO(count(u),u.typeId,u.modifiedAt) from UserCampaignObjective u where campId = ? group by objectiveTypeId,modifiedAt
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但是您要确保构造函数 StatsDTO 已经存在。

  • 使用此类查询时，请确保提供 DTO 类的完整路径。例如“com.example.task.dto.StatsDTO(arg1, arg2, ...)”。参考：/sf/answers/2543041651/ (5认同)
  • 这是使用 JPQL 并且不适用于 OP，因为他使用的是“本机查询”。需要根据 @Thanthu 的答案使用“投影”，使 DTO 成为一个接口。 (4认同)

Tha*_*thu 19

您可以通过使 DTO 成为具有查询返回的列的 getter 的接口来解决此问题并通过使用投影来实现结果。当我遇到同样的问题时，这就是我所做的。

例如，在您的情况下更改StatsDTO为如下所示的界面，如果您使用的是“.”，请确保为您的列提供别名。操作员：

public interface StatsDTO {
    Integer getUserCount();
    Byte getTypeId();
    Instant getModifiedAt();
}
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同样在您的查询中，分别为您的列提供别名，例如 userCount、typeId、modifiedAt，以便正确映射。

  • 有没有办法让它在这里使用类来工作？我想要一个带有变量 `userCount`、`typeId`、`modifiedAt` 的类，并使用相同的约定映射它们。我已准备好进行新的依赖项安装，但使用类并使 SQL 结果对象直接映射到此类的实例以具有“List&lt;StatsDTO&gt;”是的，我有一个有效的“SqlResultSetMapping”设置，但这对我来说太多了案件 (6认同)
  • 最后！这是我今天得到的唯一将 nativeQuery 结果直接映射到 DTO 的解决方案。 (3认同)
  • 谢谢，它对我来说工作得很好，只是我不明白这是如何工作的，所以当值从数据库返回时，他们将查看 get 方法（及其名称），并且界面会自动创建保存属性的属性返回值？我是对的还是我不明白什么？感谢您的考虑 (2认同)

Jen*_*der 6

您的列名不匹配：

  • userCount
  • type_id
  • modified_at

和您的财产名称：

  • userCount
  • typeId
  • modifiedAt

由于这是本机查询，因此 JPA 命名策略不适用，列名称应与属性名称匹配。因此，如果您将查询更改为以下内容，它应该可以工作：

select count(type_id) userCount, type_id as typeId, modified_at as modifiedAt from ...
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  • @Jeans 尝试了你的建议，但仍然存在同样的问题。没有帮助。 (2认同)

小智 6

如果您仍在寻找答案，这就是我的做法

@Data
@NoArgsConstructor
@AllArgsConstructor
public class StatsDTO {
    private Integer userCount;
    private Byte typeId;
    private Instant modifiedAt;
}
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你的查询应该是这样的

public interface UserRepository extends CrudRepository<UserEntity, Long> {
    @Query(value = "select new com.example.package.StatsDTO(count(type_id) userCount, typeId, modifiedAt from "
                + "UserCampaignObjective where campId = ?1 group by objectiveTypeId,modifiedAt")

        List<StatsDTO> getStatsDTO(Long camp_id);
}
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确保 StatsDTO 中有一个构造函数来映射所有字段。

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