Download Android Database Best Practices by Adam Stroud PDF

By Adam Stroud

Battle-Tested thoughts for Storing, coping with, and Sharing Android information this can be the 1st consultant to target the most serious elements of Android improvement: the right way to successfully shop, retrieve, deal with, and percentage info out of your app’s inner database. via real-world code examples, you can use on your personal apps, you’ll how you can take complete good thing about SQLite and the database-related sessions on Android. part of Addison-Wesley’s Android™ Deep Dive sequence for knowledgeable Android builders, Android Database most sensible Practices attracts on Adam Stroud’s broad adventure top state-of-the-art app initiatives. Stroud stories the center database idea and SQL thoughts you must successfully construct, manage, and browse SQLite databases. He explores SQLite intimately, illuminates Android’s APIs for database interplay, and stocks smooth most sensible practices for operating with databases within the Android atmosphere. via an entire case research, you’ll how one can layout your info entry layer to simplify all points of information administration and keep away from undesirable technical debt. You’ll additionally locate particular options for universal demanding situations in development data-enabled Android apps, together with matters linked to threading, distant info entry, and displaying facts to clients. large, updated pattern code is out there for obtain at github.com/android-database-best-practices/device-database.

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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 downside of WAL is that it can be slower in scenarios where read operations have a high frequency and write operations have a low frequency. ­Enabling WAL also causes SQLite to perform an extra operation, the checkpoint. Multithread Support SQLite supports multiple threading modes: single-thread, multithread, and s­ erialized.

Notice that the model names are sorted. This allows SQLite to perform a binary search to find the matching model. Once it is found, SQLite can access the rowid for the model and use that to perform the lookup of the row data in the device table without the need for a full table scan. 3 Index on model model rowid Galaxy Nexus Nexus 4 Nexus One Nexus S 3 5 1 2 CREATE INDEX IF UNIQUE schema-name . org DROP INDEX IF EXISTS schema-name . org CREATE INDEX The CREATE INDEX statement needs a name as well as a column definition for the index.

The Android Debug Bridge (adb) utility can be used to display the version of SQLite that is present on an Android device using the following command: adb -s shell sqlite3 –version While adb is not something that is generally used in app code, it can be used to d­ etermine which version of SQLite is present on a device or emulator that represents the minimum SDK level that is supported by an app. ” Full Text Search SQLite supports full-text search (FTS), allowing an app to query the database for all rows that contain a specified string or token.

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