在 JPA Spring 中实现 customDao 运行 JPARepository 错误
Implementing a customDao in JPA Spring JPARepository error at running
我正在尝试在 Spring JPA 应用程序中实现 daoImpl。
我有这个 classes.
道
package com.oxygen.backendoxygen.dao;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import com.oxygen.backendoxygen.model.Noticia;
@Repository
public interface NoticiaDao extends JpaRepository<Noticia, Long>, NoticiaDaoCustom {
}
自定义道：
package com.oxygen.backendoxygen.dao;
import java.util.List;
import com.oxygen.backendoxygen.model.Noticia;
public interface NoticiaDaoCustom {
List<Noticia> getUltimasNoticias();
}
以及自定义 Dao 的实现：
package com.oxygen.backendoxygen.dao.impl;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import com.oxygen.backendoxygen.dao.NoticiaDao;
import com.oxygen.backendoxygen.model.Noticia;
public abstract class NoticiaDaoCustomImpl implements NoticiaDao {
@PersistenceContext
EntityManager entityManager;
@SuppressWarnings("unchecked")
@Override
public List<Noticia> getUltimasNoticias () {
Query query = entityManager.createNativeQuery("SELECT em.* FROM spring_data_jpa_example.employee as em " +
"WHERE em.firstname LIKE ?", Noticia.class);
query.setParameter(1, "parametro");
return query.getResultList();
}
}
控制器class:
package com.oxygen.backendoxygen.controllers;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.oxygen.backendoxygen.dao.NoticiaDao;
import com.oxygen.backendoxygen.model.Noticia;
@RestController @CrossOrigin(origins = "http://localhost:4200")
@RequestMapping("/rest")
public class NoticiaController {
@Autowired
NoticiaDao noticiaDao;
@GetMapping("/noticias")
public List<Noticia> getAllNoticias() {
return noticiaDao.findAll();
}
@GetMapping("/noticias/{id}")
public ResponseEntity<Noticia> getNoticiabyId (@PathVariable(value = "id") Long idNoticia) {
Noticia noticia = noticiaDao.getById(idNoticia);
return ResponseEntity.ok().body(noticia);
}
@PostMapping("/createNoticia")
public Noticia createNoticia(@Valid @RequestBody Noticia noticia) {
return noticiaDao.save(noticia);
}
@PutMapping("/updateNoticia/{id}")
public ResponseEntity<Noticia> updateNoticia(@PathVariable(value="id") Long idNoticia,
@Valid @RequestBody Noticia detallesNoticia) {
Noticia noticia = noticiaDao.getById(idNoticia);
noticia.setAutor(detallesNoticia.getAutor());
noticia.setContenido(detallesNoticia.getContenido());
noticia.setCategorias(detallesNoticia.getCategorias());
noticia.setFx_edicion_fx(detallesNoticia.getFx_edicion_fx());
noticia.setFx_publicacion_fx(detallesNoticia.getFx_publicacion_fx());
noticia.setImagen_destacada(detallesNoticia.getImagen_destacada());
noticia.setSubtitulo(detallesNoticia.getSubtitulo());
noticia.setTitulo(detallesNoticia.getTitulo());
final Noticia noticiaActualizado = noticiaDao.save(noticia);
return ResponseEntity.ok(noticiaActualizado);
}
@DeleteMapping("borrarNoticia/{id}")
public Map<String,Boolean> deleteNoticia(@PathVariable(value="id") Long idNoticia) {
Noticia noticia = noticiaDao.getById(idNoticia);
noticiaDao.delete(noticia);
Map<String, Boolean> response = new HashMap<>();
response.put("borrado", Boolean.TRUE);
return response;
}
}
当我尝试 运行 应用程序时出现以下错误：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-10-14 11:39:03.306 ERROR 11992 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'noticiaController': Unsatisfied dependency expressed through field 'noticiaDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'noticiaDao' defined in com.oxygen.backendoxygen.dao.NoticiaDao defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is org.springframework.data.repository.query.QueryCreationException: Could not create query for public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! Reason: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=16=](AbstractBeanFactory.java:335) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.10.jar:5.3.10]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.10.jar:5.3.10]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) [spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) [spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) [spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) [spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) [spring-boot-2.5.5.jar:2.5.5]
at com.oxygen.backendoxygen.BackendOxygenApplication.main(BackendOxygenApplication.java:10) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'noticiaDao' defined in com.oxygen.backendoxygen.dao.NoticiaDao defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is org.springframework.data.repository.query.QueryCreationException: Could not create query for public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! Reason: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=16=](AbstractBeanFactory.java:335) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.10.jar:5.3.10]
... 20 common frames omitted
Caused by: org.springframework.data.repository.query.QueryCreationException: Could not create query for public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! Reason: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!
at org.springframework.data.repository.query.QueryCreationException.create(QueryCreationException.java:101) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.lookupQuery(QueryExecutorMethodInterceptor.java:106) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery(QueryExecutorMethodInterceptor.java:94) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.Iterator.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.Collections$UnmodifiableCollection.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.mapMethodsToQuery(QueryExecutorMethodInterceptor.java:96) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.lambda$new[=16=](QueryExecutorMethodInterceptor.java:86) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.Optional.map(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.<init>(QueryExecutorMethodInterceptor.java:86) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:360) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet(RepositoryFactoryBeanSupport.java:323) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.util.Lazy.getNullable(Lazy.java:230) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.util.Lazy.get(Lazy.java:114) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:329) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:144) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800) ~[spring-beans-5.3.10.jar:5.3.10]
... 30 common frames omitted
Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:96) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:107) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:218) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:81) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.lookupQuery(QueryExecutorMethodInterceptor.java:102) ~[spring-data-commons-2.5.5.jar:2.5.5]
... 52 common frames omitted
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property getUltimasNoticias found for type Noticia!
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:90) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:437) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:413) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.mapping.PropertyPath.lambda$from[=16=](PropertyPath.java:366) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.concurrent.ConcurrentMap.computeIfAbsent(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:348) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:331) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.query.parser.Part.<init>(Part.java:81) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new[=16=](PartTree.java:249) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:250) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.query.parser.PartTree$Predicate.lambda$new[=16=](PartTree.java:383) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:384) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:92) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:89) ~[spring-data-jpa-2.5.5.jar:2.5.5]
... 56 common frames omitted
这里有什么问题。我已阅读 Spring 文档，但没有找到如何使用 JPA 和自定义方法进行查询。
提前致谢。
在我看来，在spring boot中，没有dao的概念，而是repository的概念，例如ExampleRepository（就是扩展JpaRepository或crudRepository的class）会对应示例（实体）
为了您的目的，您可以将 Example 转换为您想要的任何内容。
我是java一年开发的，所以答案可能不正确。
更新：
控制器
@RestController
@CrossOrigin("*")
public class ExampleControler {
private ExampleRepository exampleRepository;
public ExampleControler(ExampleRepository exampleRepository) {
this.exampleRepository = exampleRepository;
}
@DeleteMapping("/dd")
public void deleteAll() {
exampleRepository.deleteAll();
}
}
实体
@Entity
@Data
@Table(name = "example")
@AllArgsConstructor
@NoArgsConstructor
public class Example {
@Id
@Column(name = "example1")
private Integer example1;
@Column(name = "example2")
private Integer example2;
}
存储库
@Repository
public interface ExampleRepository extends JpaRepository<Example, Integer> {
}
那是spring引导项目的基本架构，你可能知道。在 application.properties 你可以添加代码来检查查询
JpaRepository<Example, Integer>
参数为Entity，从这个Entity中，可以转换Class你想要的
您的 NoticiaDaoCustomImpl class 是 abstract，因此 Spring 将永远无法创建 class 的实例。删除摘要并在 class.
之上添加 @Component
@Component is an annotation that allows Spring to automatically detect custom beans.
从有关 @Component
的更多信息中查看 here
这是 abstract class 的定义：
An abstract class is a class that is declared abstract—it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.
详细了解 abstract classes here。
我正在尝试在 Spring JPA 应用程序中实现 daoImpl。
我有这个 classes.
道
package com.oxygen.backendoxygen.dao;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import com.oxygen.backendoxygen.model.Noticia;
@Repository
public interface NoticiaDao extends JpaRepository<Noticia, Long>, NoticiaDaoCustom {
}
自定义道：
package com.oxygen.backendoxygen.dao;
import java.util.List;
import com.oxygen.backendoxygen.model.Noticia;
public interface NoticiaDaoCustom {
List<Noticia> getUltimasNoticias();
}
以及自定义 Dao 的实现：
package com.oxygen.backendoxygen.dao.impl;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import com.oxygen.backendoxygen.dao.NoticiaDao;
import com.oxygen.backendoxygen.model.Noticia;
public abstract class NoticiaDaoCustomImpl implements NoticiaDao {
@PersistenceContext
EntityManager entityManager;
@SuppressWarnings("unchecked")
@Override
public List<Noticia> getUltimasNoticias () {
Query query = entityManager.createNativeQuery("SELECT em.* FROM spring_data_jpa_example.employee as em " +
"WHERE em.firstname LIKE ?", Noticia.class);
query.setParameter(1, "parametro");
return query.getResultList();
}
}
控制器class:
package com.oxygen.backendoxygen.controllers;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.oxygen.backendoxygen.dao.NoticiaDao;
import com.oxygen.backendoxygen.model.Noticia;
@RestController @CrossOrigin(origins = "http://localhost:4200")
@RequestMapping("/rest")
public class NoticiaController {
@Autowired
NoticiaDao noticiaDao;
@GetMapping("/noticias")
public List<Noticia> getAllNoticias() {
return noticiaDao.findAll();
}
@GetMapping("/noticias/{id}")
public ResponseEntity<Noticia> getNoticiabyId (@PathVariable(value = "id") Long idNoticia) {
Noticia noticia = noticiaDao.getById(idNoticia);
return ResponseEntity.ok().body(noticia);
}
@PostMapping("/createNoticia")
public Noticia createNoticia(@Valid @RequestBody Noticia noticia) {
return noticiaDao.save(noticia);
}
@PutMapping("/updateNoticia/{id}")
public ResponseEntity<Noticia> updateNoticia(@PathVariable(value="id") Long idNoticia,
@Valid @RequestBody Noticia detallesNoticia) {
Noticia noticia = noticiaDao.getById(idNoticia);
noticia.setAutor(detallesNoticia.getAutor());
noticia.setContenido(detallesNoticia.getContenido());
noticia.setCategorias(detallesNoticia.getCategorias());
noticia.setFx_edicion_fx(detallesNoticia.getFx_edicion_fx());
noticia.setFx_publicacion_fx(detallesNoticia.getFx_publicacion_fx());
noticia.setImagen_destacada(detallesNoticia.getImagen_destacada());
noticia.setSubtitulo(detallesNoticia.getSubtitulo());
noticia.setTitulo(detallesNoticia.getTitulo());
final Noticia noticiaActualizado = noticiaDao.save(noticia);
return ResponseEntity.ok(noticiaActualizado);
}
@DeleteMapping("borrarNoticia/{id}")
public Map<String,Boolean> deleteNoticia(@PathVariable(value="id") Long idNoticia) {
Noticia noticia = noticiaDao.getById(idNoticia);
noticiaDao.delete(noticia);
Map<String, Boolean> response = new HashMap<>();
response.put("borrado", Boolean.TRUE);
return response;
}
}
当我尝试 运行 应用程序时出现以下错误：
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-10-14 11:39:03.306 ERROR 11992 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'noticiaController': Unsatisfied dependency expressed through field 'noticiaDao'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'noticiaDao' defined in com.oxygen.backendoxygen.dao.NoticiaDao defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is org.springframework.data.repository.query.QueryCreationException: Could not create query for public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! Reason: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=16=](AbstractBeanFactory.java:335) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.10.jar:5.3.10]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.10.jar:5.3.10]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) [spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) [spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) [spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) [spring-boot-2.5.5.jar:2.5.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) [spring-boot-2.5.5.jar:2.5.5]
at com.oxygen.backendoxygen.BackendOxygenApplication.main(BackendOxygenApplication.java:10) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'noticiaDao' defined in com.oxygen.backendoxygen.dao.NoticiaDao defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is org.springframework.data.repository.query.QueryCreationException: Could not create query for public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! Reason: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=16=](AbstractBeanFactory.java:335) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.10.jar:5.3.10]
... 20 common frames omitted
Caused by: org.springframework.data.repository.query.QueryCreationException: Could not create query for public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! Reason: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!
at org.springframework.data.repository.query.QueryCreationException.create(QueryCreationException.java:101) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.lookupQuery(QueryExecutorMethodInterceptor.java:106) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery(QueryExecutorMethodInterceptor.java:94) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.Iterator.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.Collections$UnmodifiableCollection.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.mapMethodsToQuery(QueryExecutorMethodInterceptor.java:96) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.lambda$new[=16=](QueryExecutorMethodInterceptor.java:86) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.Optional.map(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.<init>(QueryExecutorMethodInterceptor.java:86) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:360) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet(RepositoryFactoryBeanSupport.java:323) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.util.Lazy.getNullable(Lazy.java:230) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.util.Lazy.get(Lazy.java:114) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:329) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:144) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863) ~[spring-beans-5.3.10.jar:5.3.10]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800) ~[spring-beans-5.3.10.jar:5.3.10]
... 30 common frames omitted
Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.oxygen.backendoxygen.dao.NoticiaDaoCustom.getUltimasNoticias()! No property getUltimasNoticias found for type Noticia!
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:96) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:107) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:218) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:81) ~[spring-data-jpa-2.5.5.jar:2.5.5]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.lookupQuery(QueryExecutorMethodInterceptor.java:102) ~[spring-data-commons-2.5.5.jar:2.5.5]
... 52 common frames omitted
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property getUltimasNoticias found for type Noticia!
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:90) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:437) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:413) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.mapping.PropertyPath.lambda$from[=16=](PropertyPath.java:366) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.concurrent.ConcurrentMap.computeIfAbsent(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:348) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:331) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.query.parser.Part.<init>(Part.java:81) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new[=16=](PartTree.java:249) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:250) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.query.parser.PartTree$Predicate.lambda$new[=16=](PartTree.java:383) ~[spring-data-commons-2.5.5.jar:2.5.5]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.accept(Unknown Source) ~[na:1.8.0_111]
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[na:1.8.0_111]
at java.util.stream.ReferencePipeline.collect(Unknown Source) ~[na:1.8.0_111]
at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:384) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:92) ~[spring-data-commons-2.5.5.jar:2.5.5]
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:89) ~[spring-data-jpa-2.5.5.jar:2.5.5]
... 56 common frames omitted
这里有什么问题。我已阅读 Spring 文档，但没有找到如何使用 JPA 和自定义方法进行查询。
提前致谢。
在我看来，在spring boot中，没有dao的概念，而是repository的概念，例如ExampleRepository（就是扩展JpaRepository或crudRepository的class）会对应示例（实体）
为了您的目的，您可以将 Example 转换为您想要的任何内容。
我是java一年开发的，所以答案可能不正确。
更新：
控制器
@RestController
@CrossOrigin("*")
public class ExampleControler {
private ExampleRepository exampleRepository;
public ExampleControler(ExampleRepository exampleRepository) {
this.exampleRepository = exampleRepository;
}
@DeleteMapping("/dd")
public void deleteAll() {
exampleRepository.deleteAll();
}
}
实体
@Entity
@Data
@Table(name = "example")
@AllArgsConstructor
@NoArgsConstructor
public class Example {
@Id
@Column(name = "example1")
private Integer example1;
@Column(name = "example2")
private Integer example2;
}
存储库
@Repository
public interface ExampleRepository extends JpaRepository<Example, Integer> {
}
那是spring引导项目的基本架构，你可能知道。在 application.properties 你可以添加代码来检查查询
JpaRepository<Example, Integer>
参数为Entity，从这个Entity中，可以转换Class你想要的
您的 NoticiaDaoCustomImpl class 是 abstract，因此 Spring 将永远无法创建 class 的实例。删除摘要并在 class.
@Component
@Componentis an annotation that allows Spring to automatically detect custom beans.
从有关 @Component
这是 abstract class 的定义：
An abstract class is a class that is declared abstract—it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.
详细了解 abstract classes here。