java - 如何使用 java 中的 Spring data JPA 将附件(文件)添加到 couchbase 中的文档？

Question

这是我提到的链接http://developer.couchbase.com/documentation/mobile/current/develop/guides/couchbase-lite/native-api/attachment/index.html但没有提及在 service 或 dao 类中的用法。 spring doc for couchbase

这是我的 dao 类

    @Repository
public interface UserRepository extends CrudRepository<User, String> {

 }

下面是我的用户模型

    @JsonIgnoreProperties(ignoreUnknown=true)
@Document
public class User implements Serializable {
    private static final long serialVersionUID = -6815079861643922076L;

    @JsonProperty("docType")
    private String docType = "users";
    @Id
    @JsonProperty("id")
    private String id;
    @JsonProperty("firstName")
    private String firstName;
    @JsonProperty("lastName")
    private String lastName;
    @JsonProperty("password")
    private byte[] password;
    public String getDocType() {
        return docType;
    }
    public void setDocType(String docType) {
        this.docType = docType;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public byte[] getPassword() {
        return password;
    }
    public void setPassword(byte[] password) {
        this.password = password;
    }
}

这是我的服务实现

    @Service("userService")
public class UserServiceImpl implements UserService {
    @Autowired(required=true)
    private UserRepository userRepository;
    public User findById(String id) throws Exception {
        User user = userRepository.findOne(id.toLowerCase());
        return user;
    }
public User create(User user MultipartFile file) throws Exception {
    String fileName = null;
     if (!file.isEmpty()) {
            try {
                fileName = file.getOriginalFilename();
                byte[] bytes = file.getBytes();
            }catch (Exception ex) {
            }
    }
//i want to attach this file as attachment to this user in couch db
    User returnUser = userRepository.save(user);
        return returnUser;
}
public User update(User user MultipartFile file) throws Exception {
    String fileName = null;
     if (!file.isEmpty()) {
            try {
                fileName = file.getOriginalFilename();
                byte[] bytes = file.getBytes();
            }catch (Exception ex) {
            }
    }
//i want to attach this file as attachment to this user in couch db
    User returnUser = userRepository.save(user);
        return returnUser;
}
}

这是我的数据库配置

    @Configuration
@EnableCouchbaseRepositories(basePackages="com.repository")
public class DBConfig extends AbstractCouchbaseConfiguration {
    @Autowired(required=true)
    private PropertyFileReader propertyFileReader;
    @Override
    protected List<String> bootstrapHosts() {
    List<String> couchbaseHostList = Arrays.asList(propertyFileReader.getCouchbaseHostList().split("\\s*,\\s*"));
        return couchbaseHostList;
    }
    @Override
    protected String getBucketName() {
        String bucketName = propertyFileReader.getCouchbaseBucketName();
        return bucketName;
    }

    @Override
    protected String getBucketPassword() {
        String bucketPassword = propertyFileReader.getCouchbaseBucketPassword();
        logger.debug("bootstrapHosts() : bucketPassword={}", bucketPassword);
        return bucketPassword;
    }
    public CustomConversions customConversions() {
        return new CustomConversions(
                Arrays.asList(StringToByteConverter.INSTANCE));
    }
    @ReadingConverter
    public static enum StringToByteConverter implements Converter<String, byte[]> {
        INSTANCE;
        @Override
        public byte[] convert(String source) {
            return Base64.decodeBase64(source);
        }
    }

}

Answer 1

不幸的是，我认为您将 Couchbase Server 和 Couchbase lite 混淆了，它们是两种不同的产品。

您使用的 Spring 框架与 Couchbase Server 交互，但 Couchbase Server 不支持附件。不过，您可以在 Couchbase 中保存二进制 blob。

Couchbase lite 确实支持附件。