Android Database Best Practices by Adam Stroud

By Adam Stroud

Battle-Tested recommendations for Storing, dealing with, and Sharing Android information this can be the 1st consultant to target the most severe features of Android improvement: how one can successfully shop, retrieve, deal with, and percentage info out of your app’s inner database. via real-world code examples, that you would be able to use on your personal apps, you’ll take complete benefit of SQLite and the database-related periods on Android. part of Addison-Wesley’s Android™ Deep Dive sequence for skilled Android builders, Android Database top Practices attracts on Adam Stroud’s wide adventure top state of the art app initiatives. Stroud stories the middle database concept and SQL recommendations you want to successfully construct, manage, and skim SQLite databases. He explores SQLite intimately, illuminates Android’s APIs for database interplay, and stocks glossy top practices for operating with databases within the Android surroundings. via an entire case examine, you’ll how one can layout your facts entry layer to simplify all features of knowledge administration and stay away from undesirable technical debt. You’ll additionally locate special strategies for universal demanding situations in construction data-enabled Android apps, together with concerns linked to threading, distant information entry, and displaying facts to clients. broad, updated pattern code is out there for obtain at github.com/android-database-best-practices/device-database.

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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, the ALTER TABLE statement does have ­limitations in SQLite. 2 that there is no way to rename or remove a column from a table. This means that once a column is added, it will always be a part of the table.

Multithread Support SQLite supports multiple threading modes: single-thread, multithread, and s­ erialized. In the single-thread mode, SQLite is not thread-safe because all of its internal ­mutexes are disabled. When running in single-thread mode, access to the database needs to be ­controlled by the application client to ensure that data does not get corrupted. ­Multithread mode adds a level of multithread support to SQLite. However, thread safety is guaranteed only if the same connection is not used in multiple threads at the same time.

SQLite automatically creates this column when creating a table unless you specifically direct it not to. 2 with the rowid included. Note The rowid column can also be accessed using standard SQL queries. The rowid is a special column in SQLite and can be used to implement indexes. The rowid for each row in a table is guaranteed to be an increasing integer that uniquely ­identifies the row. 2 that the rowid values may not be ­consecutive. This is because rowids are generated as rows are inserted to a table, and ­rowid values are not reused when rows are removed from a table.

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