春天：不滿意的依賴

學習Springboot創建一個簡單的項目。初期我試着用hashsets中的假數據嘲笑DAO，一切都很好，移動到實際的DAO - 所有的地獄都打破了。春天：不滿意的依賴

目前我試圖從表中提取某些數據，但它不工作，tried all possible SO threads，做scanBasePackages設置爲我com.base.project爲好，沒有什麼是helping.Hence訴諸最後的希望。

此外，除了錯誤，如果你想在代碼流建議更正，請告訴....任何學習是歡迎的！ :)

Controller類

@RestController 
@RequestMapping("/movies") 

public class MovieController { 

    @Autowired 
    private MovieServices movieServices; 

    @RequestMapping(method = RequestMethod.GET) 
    public Collection<Movie> getAllMovies(){ 
     return movieServices.getAllMovies(); 
    } 
}

服務類

@Service // annotation needed to be recongnised as a bean - https://stackoverflow.com/questions/41663652/consider-defining-a-bean-of-type-service-in-your-configuration-spring-boot 
public class MovieServices { 

    @Autowired // help avoid 'new' keyword on every call 
    private MovieDao movies; 

    public MovieServices(){} 

    public Collection<Movie> getAllMovies(){ 
     return movies.findByInCinemas(true); 

    } 

}

實體類

@Entity // This tells Hibernate to make a table out of this class 
public class Movie { 
    @Id 
    @GeneratedValue(strategy=GenerationType.AUTO) 
    @Column(name="movieId") 
    private int movieId; 
    private String title; 
    private String language; 
    private String genre; 
    private boolean inCinemas; 

    public Movie(int id, String title, String language, String genre, boolean inCinemas) { 
     this.movieId = id; 
     this.title = title; 
     this.language = language; 
     this.genre = genre; 
     this.inCinemas = inCinemas; 
    } 

    public boolean isInCinemas() { 
     return inCinemas; 
    } 

    public void setInCinemas(boolean inCinemas) { 
     this.inCinemas = inCinemas; 
    } 


    public int getMovieId() { 
     return movieId; 
    } 

    public void setMovieId(int movieId) { 
     this.movieId = movieId; 
    } 

    public String getTitle() { 
     return title; 
    } 

    public void setTitle(String title) { 
     this.title = title; 
    } 

    public String getLanguage() { 
     return language; 
    } 

    public void setLanguage(String language) { 
     this.language = language; 
    } 

    public String getGenre() { 
     return genre; 
    } 

    public void setGenre(String genre) { 
     this.genre = genre; 
    } 
}

DAO類

@Repository 
public interface MovieDao extends CrudRepository<Movie, Long>{ 
// private static Map<Integer, Movie> movies; 

// @Autowired 
// GenericDao genericDao; 


    // custom query example and return a stream 
    @Query("select * from movie where in_cinemas = :in_cinemas") 
    List<Movie> findByInCinemas(@Param("in_cinemas") boolean inCinemas); 


}

堆棧跟蹤

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled. 
2017-09-24 02:16:15.587 ERROR 71250 --- [   main] o.s.boot.SpringApplication    : Application startup failed 

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'movieController': Unsatisfied dependency expressed through field 'movieServices'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'movieServices': Unsatisfied dependency expressed through field 'movies'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'movieDao': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List com.interview.intuit.Dao.MovieDao.findByInCinemas(boolean)! 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.7.RELEASE.jar:1.5.7.RELEASE] 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.7.RELEASE.jar:1.5.7.RELEASE] 
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.7.RELEASE.jar:1.5.7.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.7.RELEASE.jar:1.5.7.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.7.RELEASE.jar:1.5.7.RELEASE] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.7.RELEASE.jar:1.5.7.RELEASE] 
    at com.interview.intuit.Main.main(Main.java:16) [classes/:na] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_101] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_101] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101] 
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147) [idea_rt.jar:na] 
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'movieServices': Unsatisfied dependency expressed through field 'movies'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'movieDao': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List com.interview.intuit.Dao.MovieDao.findByInCinemas(boolean)! 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    ... 24 common frames omitted 
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'movieDao': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List com.interview.intuit.Dao.MovieDao.findByInCinemas(boolean)! 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    ... 37 common frames omitted 
Caused by: java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List com.interview.intuit.Dao.MovieDao.findByInCinemas(boolean)! 
    at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:92) ~[spring-data-jpa-1.11.7.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.query.SimpleJpaQuery.<init>(SimpleJpaQuery.java:62) ~[spring-data-jpa-1.11.7.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.query.JpaQueryFactory.fromMethodWithQueryString(JpaQueryFactory.java:72) ~[spring-data-jpa-1.11.7.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.query.JpaQueryFactory.fromQueryAnnotation(JpaQueryFactory.java:53) ~[spring-data-jpa-1.11.7.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$DeclaredQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:144) ~[spring-data-jpa-1.11.7.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:212) ~[spring-data-jpa-1.11.7.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:77) ~[spring-data-jpa-1.11.7.RELEASE.jar:na] 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:436) ~[spring-data-commons-1.13.7.RELEASE.jar:na] 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:221) ~[spring-data-commons-1.13.7.RELEASE.jar:na] 
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:277) ~[spring-data-commons-1.13.7.RELEASE.jar:na] 
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:263) ~[spring-data-commons-1.13.7.RELEASE.jar:na] 
    at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:101) ~[spring-data-jpa-1.11.7.RELEASE.jar:na] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    ... 47 common frames omitted 
Caused by: java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: * near line 1, column 8 [select * from movie where in_cinemas = :in_cinemas] 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1679) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1602) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1608) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:294) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_101] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_101] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101] 
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:347) ~[spring-orm-4.3.11.RELEASE.jar:4.3.11.RELEASE] 
    at com.sun.proxy.$Proxy80.createQuery(Unknown Source) ~[na:na] 
    at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:86) ~[spring-data-jpa-1.11.7.RELEASE.jar:na] 
    ... 60 common frames omitted 
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: * near line 1, column 8 [select * from movie where in_cinemas = :in_cinemas] 
    at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:74) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.hql.internal.ast.ErrorCounter.throwQueryException(ErrorCounter.java:91) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:288) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:187) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:142) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:76) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:150) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:302) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:240) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1894) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:291) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final] 
    ... 67 common frames omitted 


Process finished with exit code 1

來源

2017-09-23 NoobEditor

你看了錯誤信息？您提供了顯式的JPA查詢，即SQL，而不是JPQL。（另外，Spring Data會爲你自動生成這個查詢。） – chrylis

嘿，嗨....是的，我確實看過這條消息。遺憾的是，無法將這個錯誤指向'controller'實際上是與'DAO相關的'....我應該刪除SQL並讓函數定義保持不變！？ – NoobEditor

所以我刪除了查詢，並將函數定義更改爲'List findByInCinemas（boolean inCinemas）;'...它編譯好但沒有輸出在api上......只是一個空的列表！ – NoobEditor

它在我看來你的查詢是不正確的JPQL。

@Query("select * from movie where in_cinemas = :in_cinemas")

大概可以使用類似

@Query("select t from Movie t where t.inCinemas = ?1") 
List<Movie> findByInCinemas(boolean inCinemas);

需要注意的是JPQL想要你的階級和階級應當在begining大字（Movie）始終。如果你的電影類看起來像

@Entity 
@Data // lombok.Data 
public class Movie { 
    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private long id; 

    @Column(name="in_cinemas") 
    private boolean inCinemas; 
}

你確實需要給類字段名inCinemas而不是表名in_cinemas

但對於這樣簡單的情況下，Spring有方法命名規則，所以你可以實際使用

@Repository 
public interface MovieDao extends CrudRepository<Movie, Long> { 
    List<Movie> findAllByInCinemas(boolean inCinemas); 
}

來源

2017-09-23 21:39:27 varren

yup ..它的作品！一個問題，循環外，我有一個票房類，它是指電影 - 票房可以有很多電影，但電影是獨立的（意味着沒有反向映射到票房）。我如何在春季介紹這個？ '@OneToMany @JoinColumn（name =「movieId」）private List movies = new ArrayList <>（）;'綁定電影以使屏幕變得易怒！ – NoobEditor

@NoobEditor如果我的問題得到了解決，你有像'movie'，'box'，'box_movie'這樣的3個表的db結構，並且你不希望Movie類知道Box的任何內容嗎？你仍然可以在'Box'中使用'@ OneToMany'，但是忽略'Movie'類中另一面的'@ ManyToOne'，並且不在那裏提供字段。說實話，我認爲只有在你真的需要並且要查詢它們時，纔會使用'@ ... Many'註釋。 – varren

可能給我10分鐘嗎？ => https://chat.stackoverflow.com/rooms/155170/spring-issues – NoobEditor

-1

我建議創建MovieServices接口和注入的typeof接口控制器沒有具體的類直接

來源

2017-09-23 21:09:08 Markownikow

您的查詢應符合JPQL語法。請檢查下面的代碼：

@Query("select m from Movie m where m.inCinemas = :in_cinemas") 
List<Movie> findByInCinemas(@Param("in_cinemas") boolean inCinemas);

來源

2017-09-23 21:24:46

hello ....它仍然給出同樣的錯誤'org.springframework.beans.factory.UnsatisfiedDependencyException：創建名爲bean的錯誤' movieController'：通過字段'movieServices'表達的不滿意的依賴性;'...當我評論查詢部分時，它正在編譯所有權利。請檢查我的意見！ :) – NoobEditor

你可以添加一個電影類代碼來看看？ –

對不起...我的壞... 1分鐘！ – NoobEditor

雖然它已經有一個解決問題的答案。

對於這個非常簡單的場景，我們實際上並不需要@Query來創建自定義查詢。讓春天的數據做他的魔法，所有你需要的是這樣的

@Repository 
public interface MovieDao extends CrudRepository<Movie, Long>{ 


    List<Movie> findByInCinemas(boolean inCinemas); 


}

即使@Repository沒有在最新的版本要求。其次，利用JpaRepository<Movie,Long>而不是CrudRepository，因爲它提供了更多jpa相關的玩法。

文檔的關鍵字：

https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repository-query-keywords

來源

2017-09-24 02:25:45 Barath

春天：不滿意的依賴

回答

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