Top 2 content-provider open source projects

Ulbora CMS is a self-contained CMS (no database needed) written in Golang. It uses a JSON datastore with content saved in both json files and in memory. You can download and upload a single binary backup file containing content, images, and templates as needed. It also has a built-in mail sender.

数据库案例：1.使用时间和日期函数，增，查时间字段。2.利用ContentProvider,CursorLoader,SQLite实现数据库的观察者模式。3.RxJava,SQLBrite实现数据库的观察者模式。4.拷贝外部db文件到数据库中