Question

我正在尝试创建一个通用的抽象存储库类来处理继承我的BaseModel类并覆盖保存行为的所有sql模型。

@Repository
public abstract class GenericRepository implements JpaRepository<BaseModel, Long> {
    @Override
    public <S extends BaseModel> S save(S baseModel) {
        long timeStamp = System.currentTimeMillis();
        if (baseModel.createdTimeStamp == 0) {
            baseModel.createdTimeStamp = timeStamp;
            baseModel.updatedTimeStamp = timeStamp;
        } else {
            baseModel.updatedTimeStamp = timeStamp;
        }
        super.save(baseModel);
        return baseModel;
    }
}

然后在我的任何控制器中自动装配此类：

 @Autowired
    GenericRepository genericRepository;

然而，当我运行我的春季启动应用程序时，我得到以下内容：

Field genericRepository in com.spring.springboot.rest.example.student.StudentResource required a bean of type 'com.spring.springboot.rest.example.student.GenericRepository' that could not be found.


Action:

Consider defining a bean of type 'com.spring.springboot.rest.example.student.GenericRepository' in your configuration.

Answer 1

首先为您的通用仓库创建一个界面：

@NoRepositoryBean
public interface GenericRepository<T extends BaseModel, Long> extends JpaRepository<T, Long> {}

然后创建您的实现：

public class GenericRepositoryImpl<T extends BaseModel> extends SimpleJpaRepository<T, Long> implements GenericRepository<T, Long> {

    @Override
    public <S extends T> S save(S baseModel) {
        long timeStamp = System.currentTimeMillis();
        if (baseModel.createdTimeStamp == 0) {
            baseModel.createdTimeStamp = timeStamp;
            baseModel.updatedTimeStamp = timeStamp;
        } else {
            baseModel.updatedTimeStamp = timeStamp;
        }
        save(baseModel);
        return baseModel;
    }
}

最后，告诉Spring将其用作存储库的基类。在你的配置的某个地方..

@Configuration
@EnableJpaRepositories(repositoryBaseClass = GenericRepositoryImpl.class)

然后你可以像这样使用它：

public interface MyEntityRepository extends GenericRepository<MyEntity> {}

一些豆子：

@Autowired
private MyEntityRepository myEntityRepository;

JpaRepository接口中的Spring boot overiding save方法

1 个答案: