【iOS（swift）笔记-14】App版本不升级时本地数据库sqlite更新逻辑二

App版本不升级时，又想即时更新本地数据库怎么办？

办法二：从服务器下载最新的sqlite数据替换掉本地的数据（注意是数据不是文件）

具体逻辑

1、首先本地数据库里一定要有一个字段（名字自己取）

比如dbVersion，可用数字（比如1或字符串1.0.0）存储，记录当前数据库的版本

2、访问服务器

服务器同样也有一个属性dbVersion2记录记录最新版本的“App的本地数据库”

如果dbVersion2>dbVersion

则下载数据进行更新。

网络数据互通通常用JSON结构，但是考虑网络安全性，通常传出去的数据要先加密，得到数据后再解密。可全局加密也可局部加密，这里为了让观众看个明白就采用了局部加密

举个栗子，下面贴出来的是服务端返回的一串数据，

基本格式是这样滴：

数据库版本@@@@@表1数据列表@@@@@表2数据列表@@@@@表3数据列表

每个表的顺序事先定好，不能再变。

因为数据库有很多个表，所以指定字符串将表数据之间分隔，App得到数据后用split分割出来，然后再将每个表的数据转成数组就OK了。

具体数组转JSON，JSON转数组的方法自己网上查找

解析出数据之后，再逐个将本地数据库sqlite进行更新即可

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