如何創建實體並將其保存到數據庫？

我創建一個春季啓動應用程序。我想將我的testEntity保存在數據庫中。我遵循本教程：https://spring.io/guides/gs/accessing-data-jpa/ 應該自動創建一個表來保存實體。如何創建實體並將其保存到數據庫？

然而，當我嘗試運行它作爲春季Booot應用即時得到follwoing錯誤：

Error creating bean with name 'demo' defined in backend.Application: Unsatisfied dependency expressed through constructor argument with index 0 of type [test.EntityRepo]: : No qualifying bean of type [test.EntityRepo] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [test.EntityRepo] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. 

No qualifying bean of type [test.EntityRepo] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}

請解釋一下我做錯了什麼，以及如何解決？

您可以在下面找到數據源配置和類。

application.properties：

spring.datasource.url=jdbc:oracle:thin://localhost:1521/orcl 
spring.datasource.username=HR 
spring.datasource.password=orcl 


spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver 
spring.jpa.hibernate.ddl-auto=create-drop 
spring.jpa.properties.hibernate.globally_quoted_identifiers=true 
spring.jpa.database-platform=org.hibernate.dialect.Oracle10gDialect 
spring.jpa.show-sql=true

testEntity：

package test; 

import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import org.springframework.data.annotation.Id; 



@Entity 
public class testEntity { 

@Id 
@GeneratedValue(strategy=GenerationType.AUTO) 
private long ID; 

private String name; 

public testEntity() {} 

public testEntity(long iD) { 
    ID = iD; 
} 

public testEntity(String name) { 
    this.name = name; 
} 

public long getID() { 
    return ID; 
} 

public void setID(long iD) { 
    ID = iD; 
} 

public String getName() { 
    return name; 
} 

public void setName(String name) { 
    this.name = name; 
} 

}

entityRepository：

package test; 

import java.util.List; 

import org.springframework.data.repository.CrudRepository; 
import org.springframework.stereotype.Repository; 

@Repository 
public interface EntityRepo extends CrudRepository<testEntity, Long>{ 
List<testEntity> findByName(String name); 
}

JPA配置類：

@Configuration 
@EnableJpaRepositories 
@EnableTransactionManagement 
class JpaConfiguration { 

    @Bean 
    public DataSource dataSource() { 

    EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder(); 
    return builder.setType(EmbeddedDatabaseType.H2).build(); 
} 

@Bean 
public EntityManagerFactory entityManagerFactory() { 

    HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter(); 
    vendorAdapter.setGenerateDdl(true); 

    LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean(); 
    factory.setJpaVendorAdapter(vendorAdapter); 
    factory.setPackagesToScan("test"); 
    factory.setDataSource(dataSource()); 
    factory.afterPropertiesSet(); 

    return factory.getObject(); 
    } 

    @Bean 
    public PlatformTransactionManager transactionManager() { 

    JpaTransactionManager txManager = new JpaTransactionManager(); 
    txManager.setEntityManagerFactory(entityManagerFactory()); 
    return txManager; 
    } 
}

類主要：

@EnableSwagger2 
@SpringBootApplication 
@EnableMapRepositories 
public class Application extends WebMvcConfigurerAdapter { 

    public static void main(String[] args) { 
    SpringApplication.run(Application.class, args); 
} 



@Bean 
public void demo(EntityRepo repository){ 
    repository.save(new testEntity("jack")); 
}

來源

2016-08-04 Akka Jaworek

嘗試這種情況：

@Autowired 
public void demo(EntityRepo repository){ 
    repository.save(new testEntity("jack")); 
}

來源

2016-08-04 09:04:13

沒有幫助，出現相同的錯誤 –

保持您的演示方法自動裝配，如上所述，並從您的接口。清理你的項目並重新運行。 –

如果不行，你可以在這裏使用我的代碼：（注意：它是一個gradle，但你可以將它轉換爲maven）https://drive.google.com/file/d/0B_EVyl90ivXwbHlXZDNwcGg5eHM/view –

嘗試：

@Autowired 
@Qualifier("demo") 
public void demo(EntityRepo repository){ 
    repository.save(new testEntity("jack")); 
} 


@Repository("entityRepo") 
public interface EntityRepo extends CrudRepository<testEntity, Long>{ 
List<testEntity> findByName(String name); 
}

來源

2016-08-04 09:14:21 FuSsA

仍然出現同樣的問題 –

答案更新.. – FuSsA

沒有解決問題 –

實測值的溶液中。 JpaConfig類是默認包，並沒有指定路徑指定，將JpaConfig文件移動到包中使用Aplication修復問題

來源

2016-08-04 11:39:55

如何創建實體並將其保存到數據庫？

回答

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