Android数据库升级-阿里云

Android Sqlite数据库升级——kotlin

Android Sqlite数据库升级——kotlin对于android开发同学来说，数据库相关操作是我们日常操作之一，相应的数据库的升级操作就必不可少了。这里我总结下数据库升级时需要注意的事项。Android中数据库操作的核心类是SqliteOpenHelper，这个类有两个方法，onCreate...

Android 数据库升级解决方案

请考虑如下情况：在数据库升级时，不同版本的数据库，他们定义的表结构完全可能是不一样的，比如V1.0的表A有10个column，而在V1.1的表A有12个colum，在升级时，表A增加了两列，此时我们应该怎么做呢。总体思路 1，将表A重命名，改了A_temp。 2，创建新表A。 3，将...

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Android数据库升级实例

第一部分　　Andoird的SQLiteOpenHelper类中有一个onUpgrade方法。帮助文档中只是说当数据库升级时该方法被触发。经过实践，解决了我一连串的疑问：　　1. 帮助文档里说的“数据库升级”是指什么？　　你开发了一个程序，当前是1.0版本。该程序用到了数据库。到1.1版本时，你在数...

Android中数据库升级onUpgrade方法说明

Andoird的SQLiteOpenHelper类中有一个onUpgrade方法。帮助文档中只是说当数据库升级时该方法被触发。经过实践，解决了我一连串的疑问：　　1. 帮助文档里说的“数据库升级”是指什么？　　你开发了一个程序，当前是1.0版本。该程序用到了数据库。到1.1版本时，你在数据库的某个表...

Android -- 面试 -- 数据库升级策略

升级：重写onUpgrade方法确定相邻版本的差别，从版本1开始依次迭代更新，先执行v1到v2，再v2到v3…… 为每个版本确定与现在数据库的差别，为每个case撰写专门的升级代码。降级 onDowngrade()数据库降级：比如从数据库4降级到数据库3必须重写该方法。 @Overrid...

android开发之sqlite数据库升级

转载请注明出处：http://blog.csdn.net/guolin_blog/article/details/39151617 在上一篇文章中，我们学习了LitePal的基本用法，体验了使用框架来进行创建表操作的便利。然而大家都知道，创建表只是数据库操作中最基本的一步而已，我们在一开始创建的表结...

Android 数据库升级解决方案

[-] 总体思路得到数据库表的列名数据库升级的意义定义数据库版本如何写升级逻辑注意如何保证数据不丢失 SQL语句请考虑如下情况：在数据库升级时，不同版本的数据库，他们定义的表结构完全可能是不一样的，比如V1.0的表A有10个column，而在V1.1的表A有12个colum，在升级时...

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