Primary keys allow the database management system to identify a specific row in a table uniquely. Alternatively, a customer table may use the customer's social security number as the primary key. For example, a table may use a bank account number column as the primary key. This is known in database terminology as the Primary Key.
Before delving into the specifics of SQLite in the context of Android development, however, a brief overview of databases and SQL will be covered.Įach database table must contain one or more columns that can be used to identify each row in the table uniquely. This chapter will provide an overview of the SQLite database management system bundled with the Android operating system, together with an outline of the Android SDK classes that are provided to facilitate persistent SQLite based database storage from within an Android application. With the ever-present risk that the Android runtime system will terminate an application component to free up resources, a comprehensive data storage strategy to avoid data loss is a key factor in the design and implementation of any application development strategy. The importance of persistent data storage becomes even more evident when taking into consideration the somewhat transient lifecycle of the typical Android application. The use of databases is an essential aspect of most applications, ranging from applications that are almost entirely data driven, to those that simply need to store small amounts of data such as the prevailing score of a game. Mobile applications that do not need to store at least some amount of persistent data are few and far between.
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