(The four most classic operations of the database are adding, deleting, modifying, and searching. When managing a lot of data, using the database can help you quickly locate the data for demand management at that time. For example, if you want to implement a search function with the database now, you can quickly find the data you need in N pieces of data by using only one search condition and one database statement, If you do not use a database, it will be very difficult to search, and the efficiency will be greatly reduced. Therefore, it is a clear choice to use a database when managing a lot of data. The database used in Android development is SQLite, which is a lightweight database, very small, portable, efficient, and reliable. Because of the limitations of hardware conditions, embedded devices are very suitable for using SQLite databases. This document includes the following annexes:)
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