NonUniqueResultException Spring JPA
NonUniqueResultException Spring JPA
我在我的项目中使用 Spring Data JPA。当我请求特定导演制作的电影列表时，我得到：
javax.persistence.NonUniqueResultException: query did not return a unique result: 11
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:128) ~[hibernate-core-5.6.1.Final.jar:5.6.1.Final]
at org.hibernate.query.internal.AbstractProducedQuery.getSingleResult(AbstractProducedQuery.java:1672) ~[hibernate-core-5.6.1.Final.jar:5.6.1.Final]
at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getSingleResult(CriteriaQueryTypeQueryAdapter.java:111) ~[hibernate-core-5.6.1.Final.jar:5.6.1.Final]
at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:198) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:90) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:155) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:143) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:159) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:138) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.transaction.interceptor.TransactionInterceptor.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.13.jar:5.3.13]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.13.jar:5.3.13]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.13.jar:5.3.13]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137) ~[spring-tx-5.3.13.jar:5.3.13]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:145) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.13.jar:5.3.13]
at com.sun.proxy.$Proxy113.findDirectorsByDirectorId(Unknown Source) ~[na:na]
at net.yukitteru.what_to_watch.controller.MovieController.showMovies(MovieController.java:33) ~[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:566) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.13.jar:5.3.13]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.55.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.13.jar:5.3.13]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.55.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.13.jar:5.3.13]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.13.jar:5.3.13]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.13.jar:5.3.13]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1722) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na]
电影资料库：
@Repository
public interface MovieRepository extends JpaRepository<Movies, Integer> {
List<Movies> findAllByDirectorsById(Directors director);
}
DirectorRepository：
@Repository
public interface DirectorRepository extends JpaRepository<Directors, Integer> {
Directors findDirectorsByDirectorId(Persons directorId);
}
个人资料库：
@Repository
public interface PersonRepository extends JpaRepository<Persons, Integer> {
Persons findPersonsByName(String name);
}
电影控制器：
@Controller
@RequestMapping("/movies")
public class MovieController {
private final DirectorRepository directorRepository;
private final MovieRepository movieRepository;
private final PersonRepository personRepository;
@Autowired
public MovieController(DirectorRepository directorRepository, MovieRepository movieRepository, PersonRepository personRepository) {
this.directorRepository = directorRepository;
this.movieRepository = movieRepository;
this.personRepository = personRepository;
}
@GetMapping("")
public List<Movies> showMovies() {
List<Movies> m = movieRepository.findAllByDirectorsById(
directorRepository.findDirectorsByDirectorId(
personRepository.findPersonsByName("Mel Brooks")));
return m;
}
}
我不明白为什么当 sql 查询一切正常时，但是当使用表达式搜索存储库时，它不能正常工作。看了类似的问题后，我没有找到任何解决我问题的方法。
董事实体：
@Entity
@NoArgsConstructor
@Setter
@EqualsAndHashCode
public class Directors {
private Integer id;
private Movies movieId;
private Persons directorId;
@Id
@Column(name = "id", nullable = false)
public Integer getId() {
return id;
}
@ManyToOne
@JsonIgnore
@JoinColumn(name = "movie_id", referencedColumnName = "id")
public Movies getMovieId() {
return movieId;
}
@ManyToOne
@JsonIgnore
@JoinColumn(name = "director_id", referencedColumnName = "id")
public Persons getDirectorId() {
return directorId;
}
}
个人实体：
@Entity
@NoArgsConstructor
@Setter
@EqualsAndHashCode
public class Persons {
private Integer id;
private String name;
private Set<Directors> directorsById;
private Set<Actors> actorsById;
@Id
@Column(name = "id", nullable = false)
public Integer getId() {
return id;
}
@Basic
@Column(name = "name", nullable = true, length = -1)
public String getName() {
return name;
}
public void Name(String name) {
this.name = name;
}
@OneToMany(mappedBy = "directorId")
public Set<Directors> getDirectorsById() {
return directorsById;
}
@OneToMany(mappedBy = "personId")
public Set<Actors> getActorsById() {
return actorsById;
}
}
电影实体：
@Entity
@NoArgsConstructor
@AllArgsConstructor
@Setter
@EqualsAndHashCode
public class Movies {
private Integer id;
private String title;
private String releaseDate;
private Long budget;
private Long revenue;
private Double popularity;
private Integer runtime;
private Double rating;
private String overview;
private Languages originalLanguage;
private Collections belongsToCollection;
private Set<MoviesGenres> moviesGenresById;
private Set<Directors> directorsById;
private Set<Actors> actorsById;
private Set<MoviesKeywords> moviesKeywordsById;
private Set<SpokenLanguages> spokenLanguagesById;
private Set<ProductionCountries> productionCountriesById;
private Set<MoviesProductionCompanies> moviesProductionCompaniesById;
@Id
@Column(name = "id", nullable = false)
public Integer getId() {
return id;
}
@Basic
@Column(name = "title", nullable = true, length = -1)
public String getTitle() {
return title;
}
@Basic
@Column(name = "release_date", nullable = true, length = -1)
public String getReleaseDate() {
return releaseDate;
}
@Basic
@Column(name = "budget", nullable = true)
public Long getBudget() {
return budget;
}
@Basic
@Column(name = "revenue", nullable = true)
public Long getRevenue() {
return revenue;
}
@Basic
@Column(name = "popularity", nullable = true, precision = 0)
public Double getPopularity() {
return popularity;
}
@Basic
@Column(name = "runtime", nullable = true)
public Integer getRuntime() {
return runtime;
}
@Basic
@Column(name = "rating", nullable = true, precision = 0)
public Double getRating() {
return rating;
}
@Basic
@Column(name = "overview", nullable = true, length = -1)
public String getOverview() {
return overview;
}
@ManyToOne
@JsonIgnore
@JoinColumn(name = "original_language", referencedColumnName = "id")
public Languages getOriginalLanguage() {
return originalLanguage;
}
@ManyToOne
@JsonIgnore
@JoinColumn(name = "belongs_to_collection", referencedColumnName = "id")
public Collections getBelongsToCollection() {
return belongsToCollection;
}
@OneToMany(mappedBy = "movieId")
public Set<MoviesGenres> getMoviesGenresById() {
return moviesGenresById;
}
@OneToMany(mappedBy = "movieId")
public Set<Directors> getDirectorsById() {
return directorsById;
}
@OneToMany(mappedBy = "movieId")
public Set<Actors> getActorsById() {
return actorsById;
}
@OneToMany(mappedBy = "movieId")
public Set<MoviesKeywords> getMoviesKeywordsById() {
return moviesKeywordsById;
}
@OneToMany(mappedBy = "movieId")
public Set<SpokenLanguages> getSpokenLanguagesById() {
return spokenLanguagesById;
}
@OneToMany(mappedBy = "movieId")
public Set<ProductionCountries> getProductionCountriesById() {
return productionCountriesById;
}
@OneToMany(mappedBy = "movieId")
public Set<MoviesProductionCompanies> getMoviesProductionCompaniesById() {
return moviesProductionCompaniesById;
}
}
personsRespository.findByPersosnName() 有多个结果，即列表，因为该方法的 return 类型不是列表，这就是导致问题的原因。
检查你的数据库，Personstable中一定有更多同名的数据。
尝试创建一个方法 Persons List findPersonsByNameList(String name)。检查这是否实际上是 return 一个只有 1 个值和相同参数的列表。
问题是一个Persons可以是很多Directors（即导演过很多部电影）。
因此DirectorRepository是错误的：
@Repository
public interface DirectorRepository extends JpaRepository<Directors, Integer> {
Directors findDirectorsByDirectorId(Persons directorId);
}
意味着 Persons 最多只能是一部电影的 Directors。
如果 Persons 是不止一部电影的 Directors，该方法 return 应该是什么？它应该随机选择一个吗？那不会很有用！这会让您想知道：为什么 MovieRepository.findAllByDirectorsById() 只 return 一部电影？
这就是为什么决定查找的结果多于 return 的查询方法抛出 NonUniqueResultException.
的原因
如何解决？您需要以 return 多个 Directors:
的方式声明 findDirectorsByDirectorId() 方法
@Repository
public interface DirectorRepository extends JpaRepository<Directors, Integer> {
List<Directors> findDirectorsByDirectorId(Persons directorId);
}
然后您需要声明方法 MovieRepository.findAllByDirectorsById() 以便它可以接受多个 Directors:
@Repository
public interface MovieRepository extends JpaRepository<Movies, Integer> {
List<Movies> findAllByDirectorsIn(List<Directors> director);
}
我在我的项目中使用 Spring Data JPA。当我请求特定导演制作的电影列表时，我得到：
javax.persistence.NonUniqueResultException: query did not return a unique result: 11
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:128) ~[hibernate-core-5.6.1.Final.jar:5.6.1.Final]
at org.hibernate.query.internal.AbstractProducedQuery.getSingleResult(AbstractProducedQuery.java:1672) ~[hibernate-core-5.6.1.Final.jar:5.6.1.Final]
at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getSingleResult(CriteriaQueryTypeQueryAdapter.java:111) ~[hibernate-core-5.6.1.Final.jar:5.6.1.Final]
at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:198) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:90) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:155) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:143) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:159) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:138) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.6.0.jar:2.6.0]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.transaction.interceptor.TransactionInterceptor.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.13.jar:5.3.13]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.13.jar:5.3.13]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.13.jar:5.3.13]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137) ~[spring-tx-5.3.13.jar:5.3.13]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:145) ~[spring-data-jpa-2.6.0.jar:2.6.0]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.13.jar:5.3.13]
at com.sun.proxy.$Proxy113.findDirectorsByDirectorId(Unknown Source) ~[na:na]
at net.yukitteru.what_to_watch.controller.MovieController.showMovies(MovieController.java:33) ~[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:566) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.13.jar:5.3.13]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.13.jar:5.3.13]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.55.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.13.jar:5.3.13]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.55.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.13.jar:5.3.13]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.13.jar:5.3.13]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.13.jar:5.3.13]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.13.jar:5.3.13]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1722) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na]
电影资料库：
@Repository
public interface MovieRepository extends JpaRepository<Movies, Integer> {
List<Movies> findAllByDirectorsById(Directors director);
}
DirectorRepository：
@Repository
public interface DirectorRepository extends JpaRepository<Directors, Integer> {
Directors findDirectorsByDirectorId(Persons directorId);
}
个人资料库：
@Repository
public interface PersonRepository extends JpaRepository<Persons, Integer> {
Persons findPersonsByName(String name);
}
电影控制器：
@Controller
@RequestMapping("/movies")
public class MovieController {
private final DirectorRepository directorRepository;
private final MovieRepository movieRepository;
private final PersonRepository personRepository;
@Autowired
public MovieController(DirectorRepository directorRepository, MovieRepository movieRepository, PersonRepository personRepository) {
this.directorRepository = directorRepository;
this.movieRepository = movieRepository;
this.personRepository = personRepository;
}
@GetMapping("")
public List<Movies> showMovies() {
List<Movies> m = movieRepository.findAllByDirectorsById(
directorRepository.findDirectorsByDirectorId(
personRepository.findPersonsByName("Mel Brooks")));
return m;
}
}
我不明白为什么当 sql 查询一切正常时，但是当使用表达式搜索存储库时，它不能正常工作。看了类似的问题后，我没有找到任何解决我问题的方法。
董事实体：
@Entity
@NoArgsConstructor
@Setter
@EqualsAndHashCode
public class Directors {
private Integer id;
private Movies movieId;
private Persons directorId;
@Id
@Column(name = "id", nullable = false)
public Integer getId() {
return id;
}
@ManyToOne
@JsonIgnore
@JoinColumn(name = "movie_id", referencedColumnName = "id")
public Movies getMovieId() {
return movieId;
}
@ManyToOne
@JsonIgnore
@JoinColumn(name = "director_id", referencedColumnName = "id")
public Persons getDirectorId() {
return directorId;
}
}
个人实体：
@Entity
@NoArgsConstructor
@Setter
@EqualsAndHashCode
public class Persons {
private Integer id;
private String name;
private Set<Directors> directorsById;
private Set<Actors> actorsById;
@Id
@Column(name = "id", nullable = false)
public Integer getId() {
return id;
}
@Basic
@Column(name = "name", nullable = true, length = -1)
public String getName() {
return name;
}
public void Name(String name) {
this.name = name;
}
@OneToMany(mappedBy = "directorId")
public Set<Directors> getDirectorsById() {
return directorsById;
}
@OneToMany(mappedBy = "personId")
public Set<Actors> getActorsById() {
return actorsById;
}
}
电影实体：
@Entity
@NoArgsConstructor
@AllArgsConstructor
@Setter
@EqualsAndHashCode
public class Movies {
private Integer id;
private String title;
private String releaseDate;
private Long budget;
private Long revenue;
private Double popularity;
private Integer runtime;
private Double rating;
private String overview;
private Languages originalLanguage;
private Collections belongsToCollection;
private Set<MoviesGenres> moviesGenresById;
private Set<Directors> directorsById;
private Set<Actors> actorsById;
private Set<MoviesKeywords> moviesKeywordsById;
private Set<SpokenLanguages> spokenLanguagesById;
private Set<ProductionCountries> productionCountriesById;
private Set<MoviesProductionCompanies> moviesProductionCompaniesById;
@Id
@Column(name = "id", nullable = false)
public Integer getId() {
return id;
}
@Basic
@Column(name = "title", nullable = true, length = -1)
public String getTitle() {
return title;
}
@Basic
@Column(name = "release_date", nullable = true, length = -1)
public String getReleaseDate() {
return releaseDate;
}
@Basic
@Column(name = "budget", nullable = true)
public Long getBudget() {
return budget;
}
@Basic
@Column(name = "revenue", nullable = true)
public Long getRevenue() {
return revenue;
}
@Basic
@Column(name = "popularity", nullable = true, precision = 0)
public Double getPopularity() {
return popularity;
}
@Basic
@Column(name = "runtime", nullable = true)
public Integer getRuntime() {
return runtime;
}
@Basic
@Column(name = "rating", nullable = true, precision = 0)
public Double getRating() {
return rating;
}
@Basic
@Column(name = "overview", nullable = true, length = -1)
public String getOverview() {
return overview;
}
@ManyToOne
@JsonIgnore
@JoinColumn(name = "original_language", referencedColumnName = "id")
public Languages getOriginalLanguage() {
return originalLanguage;
}
@ManyToOne
@JsonIgnore
@JoinColumn(name = "belongs_to_collection", referencedColumnName = "id")
public Collections getBelongsToCollection() {
return belongsToCollection;
}
@OneToMany(mappedBy = "movieId")
public Set<MoviesGenres> getMoviesGenresById() {
return moviesGenresById;
}
@OneToMany(mappedBy = "movieId")
public Set<Directors> getDirectorsById() {
return directorsById;
}
@OneToMany(mappedBy = "movieId")
public Set<Actors> getActorsById() {
return actorsById;
}
@OneToMany(mappedBy = "movieId")
public Set<MoviesKeywords> getMoviesKeywordsById() {
return moviesKeywordsById;
}
@OneToMany(mappedBy = "movieId")
public Set<SpokenLanguages> getSpokenLanguagesById() {
return spokenLanguagesById;
}
@OneToMany(mappedBy = "movieId")
public Set<ProductionCountries> getProductionCountriesById() {
return productionCountriesById;
}
@OneToMany(mappedBy = "movieId")
public Set<MoviesProductionCompanies> getMoviesProductionCompaniesById() {
return moviesProductionCompaniesById;
}
}
personsRespository.findByPersosnName() 有多个结果，即列表，因为该方法的 return 类型不是列表，这就是导致问题的原因。
检查你的数据库，Personstable中一定有更多同名的数据。
尝试创建一个方法 Persons List findPersonsByNameList(String name)。检查这是否实际上是 return 一个只有 1 个值和相同参数的列表。
问题是一个Persons可以是很多Directors（即导演过很多部电影）。
因此DirectorRepository是错误的：
@Repository
public interface DirectorRepository extends JpaRepository<Directors, Integer> {
Directors findDirectorsByDirectorId(Persons directorId);
}
意味着 Persons 最多只能是一部电影的 Directors。
如果 Persons 是不止一部电影的 Directors，该方法 return 应该是什么？它应该随机选择一个吗？那不会很有用！这会让您想知道：为什么 MovieRepository.findAllByDirectorsById() 只 return 一部电影？
这就是为什么决定查找的结果多于 return 的查询方法抛出 NonUniqueResultException.
如何解决？您需要以 return 多个 Directors:
findDirectorsByDirectorId() 方法
@Repository
public interface DirectorRepository extends JpaRepository<Directors, Integer> {
List<Directors> findDirectorsByDirectorId(Persons directorId);
}
然后您需要声明方法 MovieRepository.findAllByDirectorsById() 以便它可以接受多个 Directors:
@Repository
public interface MovieRepository extends JpaRepository<Movies, Integer> {
List<Movies> findAllByDirectorsIn(List<Directors> director);
}