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README
Apache-2.0

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简介

本项目继承自 dict-autoGitee|Github

在项目开发过程中,会有一些数据转换的需要,比如:需要将字典code转为对应的字典值;将文件Id转为对应的文件信息; 订单关联的商品id需要转换为商品信息(非通用功能,有独立的业务逻辑,需要自行考量)。
此时就需要批量查询对应的数据id,再批量查询对应的数据并回填,如下代码:

  • UserVo
@Data
public class UserVo implements Serializable {
    ...
    /**
     * 活动id
     */
    private Long promotionId;
    /**
     * promotionId对应的活动名称
     */
    private String promotionName;
    ...
}
  • UserController#list
public List<UserVo> list(){
    // 已有用户信息,需要根据promotionId回填promotionName
    AutoPageHelper.startPage();
    List<UserVo> userList = userMapper.list();
    
    // ******************************* 重复代码 重复代码 重复代码 *******************************
    // 获取所有的promotionId
    Set<Long> promotionIdSet = userList.stream().map(User::getPromotionId).collect(Collectors.toSet());
    // 批量获取promotionName数据, key: promotionId
    Map<Long, String> promotionIdNameMap = promotionMapper.selectNameMapByIds(promotionIdSet);
    
    // 回填promotionName数据
    for(UserVo user : userList){
        String promotionNameMap = promotionIdNameMap.get(user.getPromotionId());
        user.setPromotionName(promotionNameMap);
    }
    // ******************************* 重复代码 重复代码 重复代码 *******************************
        
    return userList;
}    

在上述代码中,大量的重复代码,为了让开发关注业务逻辑的功能实现,避免大量重复开发工作,auto-inject-all项目应运而生。
该项目将数值映射工作提取通用方法, 使用注解即可方便实现上述代码中将genderId转为Gender对象的操作。

三、使用

3.1 基础使用

使用本项目的数值自动映射功能,需要实现三步:

  1. 在方法上使用@InjectResult注解,标明当前方法返回值需要执行自动映射功能
  2. 在方法返回值对象的属性上使用自定义(如:InjectPromotionName)注解
  3. 实现数值获取策略,提供数值映射的数据

3.1.1 数值映射注解

参考代码 UserController#user

public class UserController {
    
    @InjectResult
    @GetMapping("list")
    public BaseRes<List<UserVo>> list() {
        ...
    }
    
}

使用@InjectResult标明方法的传回值需要进行自动映射

3.1.2 方法返回值注入属性

public class UserVo implements Serializable {
    /**
     * 活动id
     */
    @InjectPromotionName(targetField = "promotionName")
    private Long promotionId;
    /**
     * 活动名称
     */
    private String promotionName;
}

InjectPromotionName为自定义的注入promotionName属性的注解,该注解关键代码如下:

@Inject(strategy = "PROMOTION_NAME")
public @interface InjectPromotionName {
    /**
     * 将值注入的属性名 <br/>
     * 由 {@link Inject#targetFieldName()} 值决定
     */
    String targetField() default "";
}
  • 其上有@Inject并标明策略为PROMOTION_NAME
  • targetField可指定被注入的属性名称。targetField名称也可由Inject#targetFieldName()自定义

3.1.3 数值获取策略

需要通过promotionId获取到对应promotionName的值,为了提高性能并增加自主性,数据获取策略会批量传入对应策略注解 标注的所有值,代码如下:

@Service
public class PromotionService implements AutoInjectStrategy<Long, Long, String, InjectPromotionName> {
    @Override
    public String strategy() {
        return "PROMOTION_NAME";
    }

    @Override
    public Map<Long, String> list(List<InjectKey<InjectPromotionName, Long>> injectKeys) {
        Map<Long, String> promotionIdNameMap = ... 
        ...
        return promotionIdNameMap;
    }
}

所有的策略都需要实现AutoInjectStrategy,实现两个方法:

  • strategy:
    需要与InjectPromotionName注解上@Inject#strategy()值一致,才能找到对应的数据获取策略
  • list:
    批量获取数值映射结果集的方法

其中四个泛型的含义为:

  • Key:
    第1个泛型,标明list方法返回MapKey
  • Id:
    第2个泛型,标明UserVo里被@InjectPromotionName标的属性类型
  • Value:
    第3个泛型,标明list方法返回MapValue
  • A:
    第4个泛型,标明对应的属性注解InjectPromotionName

通用实现

为了方便开发,本项目实现的基本的注入映射实现,但数据的获取策略还是需要自行实现

Normal

如果项目中只有一个属性需要自动映射注入,即可用Normal策略

Dict(字典)

  • DictCst#DICT 字典策略
  • InjectDict
    字典属性注解
  • DictInjectStrategy 抽象的字典数值获取策略,它提取了通用功能,只保留数据查询功能让开发者自行实现
  • DictItem 字典信息基类,如果需要返回更多值,也可以自行继承它,它的所有属性都是protected

字典设计思路

这里给大家提供一个思路,将表结构附上,不一定要完全按照这个来设计你自己的字典功能。你应该在理解这个设计思路的基础上创建 你自己的功能

CREATE TABLE `sys_dict` (
  `id` bigint unsigned NOT NULL AUTO_INCREMENT,
  `parent_code` varchar(32) NOT NULL DEFAULT '0' COMMENT '父级code,关联 sys_dict.code,根为0',
  `level` int unsigned NOT NULL DEFAULT '0' COMMENT '层级,根为0',
  `subject` varchar(32) NOT NULL COMMENT '分组,值相同则为一组,关联 DictSubjectEnum',
  `code` varchar(32) NOT NULL COMMENT '字典数值,同一组下唯一,关联 DictCodeEnum',
  `value` varchar(2048) NOT NULL COMMENT '信息,字面值或json',
  `full_code` varchar(1024) NOT NULL COMMENT '层级code以/拼接,根为自身code,一定以/结尾,如:, 1/2/, 1/2/3/',
  `sort` int unsigned NOT NULL DEFAULT '0' COMMENT '降序排序',
  `delete_status` tinyint unsigned NOT NULL DEFAULT '0',
  `create_by` bigint NOT NULL,
  `update_by` bigint NOT NULL,
  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=22 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='字典或配置表';

顺便举一个数据的例子便于理解:

INSERT INTO jinbaoduo0.sys_dict 
(parent_code,`level`,subject,code,value,full_code,sort,delete_status,create_by,update_by,create_time,update_time) 
VALUES
	 ('0',0,'WITHDRAW_STATUS','NONE','待申请','WITHDRAW_STATUS/NONE/',5,0,1,1,'2023-09-07 23:50:01','2023-09-07 23:50:01'),
	 ('0',0,'WITHDRAW_STATUS','APPLYING','申请中','WITHDRAW_STATUS/APPLYING/',4,0,1,1,'2023-09-07 23:50:01','2023-09-07 23:50:01'),
	 ('0',0,'WITHDRAW_STATUS','PROCESSING','处理中','WITHDRAW_STATUS/PROCESSING/',3,0,1,1,'2023-09-07 23:50:01','2023-09-07 23:50:01'),
	 ('0',0,'WITHDRAW_STATUS','FINISHED','已完成','WITHDRAW_STATUS/FINISHED/',2,0,1,1,'2023-09-07 23:50:01','2023-09-07 23:50:01'),
	 ('0',0,'WITHDRAW_STATUS','CLOSED','已关闭','WITHDRAW_STATUS/CLOSED/',1,0,1,1,'2023-09-07 23:50:01','2023-09-07 23:50:01');

记录

版本 创作者 时间 内容
1.0.0 chad 2023-09-15 自动注入数据
chad 2023-09-21 更新README
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简介

自动数值转换,避免重复功能开发 展开 收起
Java 等 2 种语言
Apache-2.0
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