[Android] Android GreenDao 保存 JavaBean 或者List <JavaBean>类型数据

Android GreenDao 保存 JavaBean 或者List <JavaBean>类型数据

简介

数据库存储数据基本上每个APP都有用到，GreenDAO 是一个将对象映射到 SQLite 数据库中的轻量且快速的 ORM 解决方案，至于用法这里不再多少，网上有很资料，这里主要说一下，利用GreenDao保存JavaBean类型或者List类型的数据。

举个栗子

{
     rating: {
     max: 10,
     average: 7.9,
     stars: "40",
     min: 0
     },
     genres: [
     "动作",
     "奇幻",
     "冒险"
     ],
     title: "海王",
     casts: [
     {
     alt: "https://movie.douban.com/celebrity/1022614/",
     avatars: {
     small: "http://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p32853.webp",
     large: "http://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p32853.webp",
     medium: "http://img1.doubanio.com/view/celebrity/s_ratio_celebrity/public/p32853.webp"
     },
     name: "杰森·莫玛",
     id: "1022614"
     },
     {
     alt: "https://movie.douban.com/celebrity/1044702/",
     avatars: {
     small: "http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p34697.webp",
     large: "http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p34697.webp",
     medium: "http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p34697.webp"
     },
     name: "艾梅柏·希尔德",
     id: "1044702"
     },
     {
     alt: "https://movie.douban.com/celebrity/1010539/",
     avatars: {
     small: "http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p9206.webp",
     large: "http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p9206.webp",
     medium: "http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p9206.webp"
     },
     name: "威廉·达福",
     id: "1010539"
     }
     ],
     collect_count: 397576,
     original_title: "Aquaman",
     subtype: "movie",
     directors: [
     {
     alt: "https://movie.douban.com/celebrity/1032122/",
     avatars: {
     small: "http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1509950363.8.webp",
     large: "http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1509950363.8.webp",
     medium: "http://img3.doubanio.com/view/celebrity/s_ratio_celebrity/public/p1509950363.8.webp"
     },
     name: "温子仁",
     id: "1032122"
     }
     ],
     year: "2018",
     images: {
     small: "http://img3.doubanio.com/view/photo/s_ratio_poster/public/p2541280047.webp",
     large: "http://img3.doubanio.com/view/photo/s_ratio_poster/public/p2541280047.webp",
     medium: "http://img3.doubanio.com/view/photo/s_ratio_poster/public/p2541280047.webp"
     },
     alt: "https://movie.douban.com/subject/3878007/",
     id: "3878007"
     }

上面是豆瓣电影一个电影详情的数据，一般复杂，有一些套嵌JsonObject和JsonArray，数据库存储的都是基本类型，像上面那些objec或者array类型又改如何存到数据库中，这是个问题。GreenDao为我们提了一个解决方案，就是把这些数据统一都转成String类型，存到数据库中，用的时候再转成相应的类型。

具体分析

这里分别列数两个例子，一个是JsonObject， 一个是JsonArray的。
首先第一个字段rating，电影的评分，返回的是一个JsonObject，写出它的JavaBean

本文参考：

https://www.jianshu.com/p/9b817a62eb22

https://blog.csdn.net/zxm317122667/article/details/73528387

https://www.jianshu.com/p/5d6de7cda713

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