我在我的專案中使用 Spring Data JPA。當我請求特定導演制作的電影串列時，我得到：
javax.persistence.NonUniqueResultException：查詢未回傳唯一結果：11
在 org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:128) ~[hibernate-core-5.6.1.Final.jar:5.6.1.Final]
在 org.hibernate.query.internal.AbstractProducedQuery.getSingleResult(AbstractProducedQuery.java:1672) ~[hibernate-core-5.6.1.Final.jar:5.6.1.Final]
在 org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getSingleResult(CriteriaQueryTypeQueryAdapter.java:111) ~[hibernate-core-5.6.1.Final.jar:5.6.1.Final]
在 org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:198) ~[spring-data-jpa-2.6.0.jar:2.6.0]
在 org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:90) ~[spring-data-jpa-2.6.0.jar:2.6.0]
在 org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:155) ~[spring-data-jpa-2.6.0.jar:2.6.0]
在 org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:143) ~[spring-data-jpa-2.6.0.jar:2.6.0]
在 org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137) ~[spring-data-commons-2.6.0.jar:2.6.0]
在 org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121) ~[spring-data-commons-2.6.0.jar:2.6.0]
在 org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:159) ~[spring-data-commons-2.6.0.jar:2.6.0]
在 org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:138) ~[spring-data-commons-2.6.0.jar:2.6.0]
在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
在 org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.6.0.jar:2.6.0]
在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
在 org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.13.jar:5.3.13]
在 org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.13.jar:5.3.13]
在 org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.13.jar:5.3.13]
在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
在 org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137) ~[spring-tx-5.3.13.jar:5.3.13]
在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
在 org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:145) ~[spring-data-jpa-2.6.0.jar:2.6.0]
在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
在 org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.13.jar:5.3.13]
在 org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.13.jar:5.3.13]
在 org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.13.jar:5.3.13]
在 com.sun.proxy.$Proxy113.findDirectorsByDirectorId(Unknown Source) ~[na:na]
在 net.yukitteru.what_to_watch.controller.MovieController.showMovies(MovieController.java:33) ~[main/:na]
在 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
在 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
在 java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
在 java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
在 org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.13.jar:5.3.13]
在 org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.13.jar:5.3.13]
在 org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.13.jar:5.3.13]
在 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.13.jar:5.3.13]
在 org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.13.jar:5.3.13]
在 org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.13.jar:5.3.13]
在 org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.13.jar:5.3.13]
在 org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.13.jar:5.3.13]
在 org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.13.jar:5.3.13]
在 org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.13.jar:5.3.13]
在 javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.55.jar:4.0.FR]
在 org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.13.jar:5.3.13]
在 javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.55.jar:4.0.FR]
在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.13.jar:5.3.13]
在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.13.jar:5.3.13]
在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.13.jar:5.3.13]
在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.13.jar:5.3.13]
在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.13.jar:5.3.13]
在 org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.13.jar:5.3.13]
在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1722) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.55.jar:9.0.55]
在 java.base/java.lang.Thread.run(Thread.java:829) ~[na:na]
電影資料庫：
@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);
}
人物資料庫：
@Repository
public interface PersonRepository extends JpaRepository<Persons, Integer> {
Persons findPersonsByName(String name);
}
電影控制器：
@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;
}
}
我不明白為什么當 sql 查詢一切正常時，但是當使用運算式搜索存盤庫時，它不能正常作業。在閱讀了類似的問題后，我沒有找到任何解決我問題的方法。
董事物體：
@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;
}
}
人員物體：
@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;
}
}
電影物體：
@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;
}
}
uj5u.com熱心網友回復：
peopleRespository.findByPersosnName() 有多個結果，即一個串列，因為該方法的回傳型別不是串列，這就是導致問題的原因。
檢查您的資料庫，Persons 表中必須有更多同名的資料。
嘗試創建一個方法 Persons List findPersonsByNameList(String name)。檢查這是否實際上回傳了一個只有 1 個值且具有相同引數的串列。
uj5u.com熱心網友回復：
問題是一個Persons可以很多Directors（即導演了很多電影）。
因此DirectorRepository是錯誤的：
@Repository
public interface DirectorRepository extends JpaRepository<Directors, Integer> {
Directors findDirectorsByDirectorId(Persons directorId);
}
意味著 aPersons只能是Directors最多一部電影的。
如果Persons是Directors多部電影的，該方法應該回傳什么？它應該隨機選擇一個嗎？那不會很有用！這會讓你想知道：為什么MovieRepository.findAllByDirectorsById()只回傳一部電影？
這就是為什么決定找到比它可以回傳的結果更多的查詢方法拋出一個NonUniqueResultException.
你怎么能解決它？您需要以findDirectorsByDirectorId()可以回傳多個的方式宣告該方法Directors：
@Repository
public interface DirectorRepository extends JpaRepository<Directors, Integer> {
List<Directors> findDirectorsByDirectorId(Persons directorId);
}
反過來，您需要宣告該方法，MovieRepository.findAllByDirectorsById()以便它可以接受多個Directors：
@Repository
public interface MovieRepository extends JpaRepository<Movies, Integer> {
List<Movies> findAllByDirectorsIn(List<Directors> director);
}
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