接口（模拟）存储库模式 java spring

Question

我是 Java 和 Spring 环境的初学者。目前我必须实现一个 CustomerRepository。 CustomerRepository 实现了 CrudRepository 接口。目的是在存储库中，应该存储和检索客户对象。 我必须使用 Spring 类 CrudRepository 的 Mock 实现。

类图如下所示： classdiagram

CrudRepository 接口：

public interface CrudRepository<Customer, String> {

<S extends Customer> S save( S entity );
...
}

完整的 CustomerRepository 类：

public class CustomerRepository implements CrudRepository<Customer, String> {
 
private CrudRepository crudrepository;

/*long count();*/
@Override
public long count() {
    long count = crudrepository.count();
    return count;
}

/*<S extends Customer> S save( S entity );*/
@Override
public <S extends Customer> S save(S entity) {
    crudrepository.save(entity);
    return entity;
}

/*<S extends Customer> Iterable<S> saveAll( Iterable<S> entities );*/
@Override
public <S extends Customer> Iterable<S> saveAll(Iterable<S> entities) {
    Iterable<S> response = crudrepository.saveAll(entities);
    return (Iterable<S>) response;
}

/*Optional<Customer> findById(String id );*/
@Override
public Optional<Customer> findById(String id) {
    Optional<Customer> customerResponse = crudrepository.findById(id);
    return customerResponse;

}

/*Iterable<Customer> findAllById(Iterable<String> ids );*/
@Override
public Iterable<Customer> findAllById(Iterable<String> ids) {
    Iterable<Customer> customerResponse = crudrepository.findAllById(ids);
    return customerResponse;
}

/*Iterable<Customer> findAll();*/
@Override
public Iterable<Customer> findAll() {
    Iterable<Customer> customerResponse = (Iterable<Customer>) crudrepository
            .findAll();
    return customerResponse;
}

/*boolean existsById(String id );*/
@Override
public boolean existsById(String id) {
    return crudrepository.existsById(id);
}

/*void deleteById(String id );*/
@Override
public void deleteById(String id) {
    crudrepository.deleteById(id);

}

/*void delete(Customer entity );*/
@Override
public void delete(Customer entity) {
    crudrepository.delete(entity);

}

/*void deleteAllById(Iterable<? extends String> ids );*/
@Override
public void deleteAllById(Iterable<? extends String> entities) {
    crudrepository.deleteAll(entities);

}

/*void deleteAll();*/
@Override
public void deleteAll() {
    crudrepository.deleteAll();
}

/*void deleteAll(Iterable<? extends Customer> entities );*/
@Override
public void deleteAll(Iterable<? extends Customer> entities) {
    crudrepository.deleteAll(entities);
    
} }

你觉得怎么样？有什么建议吗？

Answer 1

我认为你误解了一些概念。

CrudRepository 是一个 Spring 对象，它是一个不需要实现的接口。你必须扩展它，而 Spring 为你提供了所有的魔法。

您可以通过以下方式实现您的目标：

存储库

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

@Repository
public interface CustomerRepository extends CrudRepository<Customer, String> {

}

服务

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CustomerService {
    
    @Autowired
    private CustomerRepository customerRepository;

    public Customer save(Customer customer) {
        Customer response = customerRepository.save(customer);
        return response;
    }
}