我正在研究一个spring data jpa＆thymeleaf项目，但遇到了连接查询问题。
我有3个表（多对多关系）：
1.课
2.选项
3.联接表：options_has_lesson
我将执行联接查询，以从选项ID +与选项ID不相关的活动课程中获取相关课程。
下面的请求有效，并且在phpMyAdmin中有我想要的记录，但是一旦将请求保存到存储库中，eclipse就会显示异常。
我已经在spring数据中进行了其他查询（但是没有join），并且没有遇到这种问题。我想这是因为加入了，即使错误消息看起来“清晰”，我也很少迷失解决它。
这是我的课程模型
@Entity
@Table(name="lesson")
@EntityListeners(AuditingEntityListener.class)
public class Lesson implements Serializable
{
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name="active")
@NotNull
private Boolean active = true;
@Column(name="name")
@NotNull
@Size(max=255)
private String name;
@ManyToMany(fetch = FetchType.LAZY,
cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
},
mappedBy = "lessons")
private Set<User> users = new HashSet<>();
@OneToMany(mappedBy = "lesson")
@JsonBackReference
private Set<OptionsHasLesson> optionsHasLesson =
new HashSet<OptionsHasLesson>();
public Lesson() {}
/**the getters & setters**/
}
这是我的选择模型
@Entity
@Table(name = "options")
@EntityListeners(AuditingEntityListener.class)
public class Options implements Serializable
{
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name="name")
@NotNull
@Size(max = 255)
private String name;
@Column(name="active")
@NotNull
private Boolean active = true;
@OneToMany(mappedBy = "options")
@JsonBackReference
private Set<OptionsHasLesson> optionsHasLesson =
new HashSet<OptionsHasLesson>();
public Options()
{}
/**the getters & setters**/
}
这是我的联接表
@Entity
@Table(name="options_has_lesson")
@EntityListeners(AuditingEntityListener.class)
public class OptionsHasLesson implements Serializable
{
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
@Column(name="id")
private long id;
@ManyToOne
@JoinColumn(name = "option_id")
@JsonManagedReference
private Options options;
@ManyToOne
@JoinColumn(name = "lesson_id")
@JsonManagedReference
private Lesson lesson;
@Column(name = "period_by_week")
@NotNull
private int periodByWeek;
/**the getters & setters**/
}
这是我的带有查询的LessonRepository
@Repository
public interface LessonRepository extends JpaRepository<Lesson ,Long>
{
List<Lesson> findByActiveTrueOrderByNameAsc();
@Query("SELECT l.id as lesson_id, l.name as lesson_name, l.active as lesson_active,"
+ " ohl.id as ohl_id, ohl.lesson_id as ohl_lesson_id, ohl.option_id, ohl.period_by_week "
+ "from lesson l "
+ "left join options_has_lesson ohl "
+ "on ohl.lesson_id = l.id "
+ "where ohl.option_id = :id or ohl.option_id is NULL and l.active is TRUE")
List<Object> findCustomQuery(@Param("id") Long id);
}
这是个例外
2019-01-03 10:41:25.176 ERROR Byron-PC --- [ restartedMain] o.s.b.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'lessonController': Unsatisfied dependency expressed through field 'lessonRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lessonRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List be.bschool.repository.LessonRepository.findCustomQuery(java.lang.Long)!
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
at be.bschool.BschoolSpringJpaThymeleafApplication.main(BschoolSpringJpaThymeleafApplication.java:14)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'lessonRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List be.bschool.repository.LessonRepository.findCustomQuery(java.lang.Long)!
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1745)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:273)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1239)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1166)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
... 24 more
Caused by: java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List be.bschool.repository.LessonRepository.findCustomQuery(java.lang.Long)!
at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:93)
at org.springframework.data.jpa.repository.query.SimpleJpaQuery.<init>(SimpleJpaQuery.java:63)
at org.springframework.data.jpa.repository.query.JpaQueryFactory.fromMethodWithQueryString(JpaQueryFactory.java:76)
at org.springframework.data.jpa.repository.query.JpaQueryFactory.fromQueryAnnotation(JpaQueryFactory.java:56)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$DeclaredQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:139)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:206)
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:79)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lookupQuery(RepositoryFactorySupport.java:566)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery$1(RepositoryFactorySupport.java:559)
at java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.util.Iterator.forEachRemaining(Unknown Source)
at java.util.Collections$UnmodifiableCollection$1.forEachRemaining(Unknown Source)
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source)
at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source)
at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
at java.util.stream.ReferencePipeline.collect(Unknown Source)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.mapMethodsToQuery(RepositoryFactorySupport.java:561)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new$0(RepositoryFactorySupport.java:551)
at java.util.Optional.map(Unknown Source)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:551)
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:324)
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:297)
at org.springframework.data.util.Lazy.getNullable(Lazy.java:211)
at org.springframework.data.util.Lazy.get(Lazy.java:94)
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:300)
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:119)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741)
... 34 more
Caused by: java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: lesson is not mapped [SELECT l.id as lesson_id, l.name as lesson_name, l.active as lesson_active, ohl.id as ohl_id, ohl.lesson_id as ohl_lesson_id, ohl.option_id, ohl.period_by_week from lesson l left join options_has_lesson ohl on ohl.lesson_id = l.id where ohl.option_id = :id or ohl.option_id is NULL and l.active is TRUE]
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:138)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:188)
at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:713)
at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:350)
at com.sun.proxy.$Proxy646.createQuery(Unknown Source)
at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:87)
... 63 more
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: lesson is not mapped [SELECT l.id as lesson_id, l.name as lesson_name, l.active as lesson_active, ohl.id as ohl_id, ohl.lesson_id as ohl_lesson_id, ohl.option_id, ohl.period_by_week from lesson l left join options_has_lesson ohl on ohl.lesson_id = l.id where ohl.option_id = :id or ohl.option_id is NULL and l.active is TRUE]
at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:79)
at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:219)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:143)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:119)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:153)
at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:595)
at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:704)
... 71 more
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: lesson is not mapped
at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:169)
at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:91)
at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:79)
at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:331)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3695)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3584)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:720)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:576)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:313)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:261)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:271)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:191)
... 77 more
答案 0 :(得分：1)
如当前所说，您的查询是用SQL编写的。 Spring使用的默认语言是HQL。这是一种面向对象的语言，因此在使用SQL语法时会引发异常。
为了在Spring内使用SQL，应按以下方式构建查询：
@Query(value=<SQL Query String>, nativeQuery=true)
这允许Spring执行SQL。
此外，如果正在使用HQL，请注意，您使用对象名称而不是表名称来引用字段。
因此，如果您想从表option_id中选择一个options_has_lessons，它将看起来像这样：
SQL：@Query(value="SELECT option_id FROM options_has_lessons", nativeQuery=true)
HQL：@Query("SELECT options FROM OptionsHasLessons")