Android Database Best Practices by Adam Stroud

By Adam Stroud

Battle-Tested options for Storing, coping with, and Sharing Android facts this is often the 1st consultant to target probably the most serious facets of Android improvement: find out how to successfully shop, retrieve, deal with, and percentage details out of your app’s inner database. via real-world code examples, that you could use on your personal apps, you’ll the best way 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 wide adventure prime state-of-the-art app tasks. Stroud stories the middle database idea and SQL innovations you want to successfully construct, manage, and browse 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 a whole case research, you’ll the best way to layout your information entry layer to simplify all aspects of information administration and steer clear of undesirable technical debt. You’ll additionally locate certain recommendations for universal demanding situations in construction data-enabled Android apps, together with matters linked to threading, distant information entry, and exhibiting information to clients. wide, up to date pattern code is out there for obtain at github.com/android-database-best-practices/device-database.

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Although SQL has been standardized by both the American National Standards ­Institute (ANSI) and the International Organization for Standardization (ISO), vendors frequently add proprietary extensions to the language to better support their platforms. This chapter primarily focuses on SQL as it is implemented in SQLite, the database ­system that is included in Android. Most of the concepts in this chapter do apply to SQL in general, but the syntax may not be the same for other database systems.

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. 2, a row with a r­ owid of 4 was inserted into the table at one point but has since been deleted.

In this mode, SQLite access is thread-safe for all access. An important point to keep in mind when using SQLite in Android is that the ­Android SDK provides additional thread-safety support. Specifically, the ­ QLiteDatabase class provides thread-safe access as long as the same instance is used S for all ­database access. What SQLite Does Not Support While SQL is a language used by relational database systems, not all features of the ­language may be supported by all database systems. SQLite is no different, and some of the limitations are in place to ensure that SQLite remains a lightweight database solution.

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