Download Android Database Best Practices by Adam Stroud PDF

By Adam Stroud

Battle-Tested concepts for Storing, handling, and Sharing Android information this is often the 1st consultant to target the most serious points of Android improvement: how you can successfully shop, retrieve, deal with, and percentage details out of your app’s inner database. via real-world code examples, that you may use on your personal apps, you’ll tips on how to take complete benefit of SQLite and the database-related sessions on Android. part of Addison-Wesley’s Android™ Deep Dive sequence for knowledgeable Android builders, Android Database top Practices attracts on Adam Stroud’s vast event prime state-of-the-art app initiatives. Stroud stories the middle database idea and SQL concepts you must successfully construct, manage, and browse SQLite databases. He explores SQLite intimately, illuminates Android’s APIs for database interplay, and stocks glossy most sensible practices for operating with databases within the Android setting. via a whole case research, you’ll find out how to layout your info entry layer to simplify all points of knowledge administration and stay away from undesirable technical debt. You’ll additionally locate exact suggestions for universal demanding situations in construction data-enabled Android apps, together with matters linked to threading, distant facts entry, and exhibiting information to clients. broad, up to date pattern code is offered for obtain at github.com/android-database-best-practices/device-database.

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For example, all access to a WAL-enabled database must happen from processes on the same machine. While this might be a concern for larger software systems, it is not a concern for Android apps since all database access likely already happens from the same process. In addition, apps don’t directly communicate with an SQLite database. Instead, they use an Android SDK API which also helps limit the negative effects of enabling WAL. Enabling WAL can make database access faster for most use cases because WAL allows read and write operations to happen simultaneously.

The NOT NULL constraint causes SQLite to throw an error if there is an attempt to insert a row into the table that contains a null value for the model column. At this point, the table can be used to store and retrieve data. However, as time passes, it is often necessary to make changes to existing tables to support the changing needs of software. This is done with an ALTER TABLE statement. ALTER TABLE The ALTER TABLE statement can be used to modify an existing table by either adding new columns or renaming the table.

However, SQLite does make use of some temporary files to support transactions, a topic that is ­discussed later in the chapter. ) makes SQLite data storage simple and convenient. Because the database file format is system agnostic, it can be read and written to across different environments. This can be a real convenience for developers because it allows them to copy an app’s SQLite database from a mobile device to a development machine and inspect its contents. Additionally, an app can include an SQLite database file to help bootstrap the database during the install/initialization process.

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