JPA 自定义存储库不是实体：类

Question

朋友。帮我解决问题。我使用弹簧 jpa。我通过使用 @Autowired 注释指定存储库来从 RestController 发出所有请求。 我知道您可以创建一个存储库类并继承 JpaRepository，但我想弄清楚如何使用我的自定义存储库。当然，如果我使用JpaRepository，那就没有错误了。

我的配置类：

package net.sunnikolay.multipledb.config;

@Configuration
    @PropertySource( { "classpath:application.properties" } )
    @EnableJpaRepositories(
        basePackages = "net.sunnikolay.multipledb.repository.ab",
        entityManagerFactoryRef = "abEntityManager",
        transactionManagerRef = "abTransactionManager"
)
public class AbHttpApiDBConfiguration {
    
    @Value( "${db.ab.datasource.hibernate.dialect}" )
    private String dialect;
    
    @Value( "${db.ab.datasource.hibernate.hbm2ddl.auto}" )
    private String hbmDdl;
    
    @Bean
    @ConfigurationProperties( prefix = "db.ab.datasource" )
    public DataSource abDataSource() {
        return DataSourceBuilder.create().build();
    }
    
    @Bean
    public LocalContainerEntityManagerFactoryBean abEntityManager() {
        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource( abDataSource() );
        em.setPackagesToScan( "net.sunnikolay.multipledb.domain.ab" );
        
        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter( vendorAdapter );
        final HashMap<String, Object> properties = new HashMap<>();
        properties.put( "hibernate.hbm2ddl.auto", hbmDdl );
        properties.put( "hibernate.dialect", dialect );
        em.setJpaPropertyMap( properties );
        
        return em;
    }
    
    @Bean
    public PlatformTransactionManager abTransactionManager() {
        final JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory( abEntityManager().getObject() );
        return transactionManager;
    }
    
}

我的实体：

package net.sunnikolay.multipledb.domain.ab;

import javax.persistence.*;

@Entity
@Table(name = "columns", schema = "invitro_report")
public class TColumn {

    @Id
    @Column(name = "report_name")
    private String reportName;
    
    @Column(name = "index")
    private int index;
    
    @Column(name = "field")
    private String field;
    
    @Column(name = "title")
    private String title;
    
    @Column(name = "description")
    private String desc;
    
    public TColumn() {
    }
    
    public String getReportName() {
        return reportName;
    }
    
    public void setReportName( String reportName ) {
        this.reportName = reportName;
    }
    
    public int getIndex() {
        return index;
    }
    
    public void setIndex( int index ) {
        this.index = index;
    }
    
    public String getField() {
        return field;
    }
    
    public void setField( String field ) {
        this.field = field;
    }
    
    public String getTitle() {
        return title;
    }
    
    public void setTitle( String title ) {
        this.title = title;
    }
    
    public String getDesc() {
        return desc;
    }
    
    public void setDesc( String desc ) {
        this.desc = desc;
    }
    
}

我的 AbRepositoryCustom：

package net.sunnikolay.multipledb.repository.ab;

@Repository
public interface AbRepositoryCustom {
    
    List<TColumn> findByName( String name );
    
}

我的 AbRepositoryCustomImpl：

package net.sunnikolay.multipledb.repository.ab;

@Repository
public class AbRepositoryCustomImpl implements AbRepositoryCustom {
    
    @PersistenceContext
    private EntityManager manager;
    
    @Override
    public List<TColumn> findByName( String name ) {
        List<TColumn> result = new ArrayList<>();
        
        try {
            CriteriaBuilder        cb   = manager.getCriteriaBuilder();
            CriteriaQuery<TColumn> cq   = cb.createQuery( TColumn.class );
            Root<TColumn>          root = cq.from( TColumn.class );
            
            Predicate[] predicates = new Predicate[ 1 ];
            predicates[ 0 ] = cb.equal( root.get( "reportName" ), name );
            
            cq.select( root ).where( predicates );
            
            TypedQuery<TColumn> query = manager.createQuery( cq );
            result = query.getResultList();
        }
        catch ( NoResultException ignore ) {}
        catch ( Exception jce ) {
            jce.printStackTrace();
        }
        
        return result;
    }
    
}

当我提出请求时，在 Root root = cq.from( TColumn.class ); 一行 "Not an entity: class net.sunnikolay.multipledb.domain.ab .TColumn 发生错误。

Answer 1

您可以创建自定义存储库，但像这样，您必须扩展 JpaRepository

public interface AbRepositoryCustom extends JpaRepository<Store, Long> {
 List<TColumn> findByName( String name );
}