By Adam Stroud
Battle-Tested concepts for Storing, coping with, and Sharing Android information this is often the 1st advisor to target probably the most severe facets of Android improvement: tips on how to successfully shop, retrieve, deal with, and proportion details out of your app’s inner database. via real-world code examples, which you could use on your personal apps, you’ll how you can take complete good thing about SQLite and the database-related periods on Android. part of Addison-Wesley’s Android™ Deep Dive sequence for skilled Android builders, Android Database most sensible Practices attracts on Adam Stroud’s large adventure top state of the art app initiatives. Stroud experiences the center database idea and SQL suggestions 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 setting. via a whole case examine, you’ll the best way to layout your facts entry layer to simplify all aspects of knowledge administration and steer clear of undesirable technical debt. You’ll additionally locate certain suggestions for universal demanding situations in construction data-enabled Android apps, together with concerns linked to threading, distant facts entry, and exhibiting facts to clients. huge, updated pattern code is on the market for obtain at github.com/android-database-best-practices/device-database.
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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. 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.
The table will still exist in the database; it will just be empty. 13 shows a DELETE statement that removes all rows from the device table where the display_size_inches is greater than 4. 13 Removing Rows with DELETE DELETE FROM device WHERE display_size_inches > 4; Now that DDL and DML have been discussed, it is time to start looking at the parts of SQL that allow queries to be run against a database. This is done with the SELECT statement. org 31 32 Chapter 2 An Introduction to SQL Queries In addition to defining database structure and manipulating data in a database, SQL provides a way to read the data.
15 This page intentionally left blank 2 An Introduction to SQL S tructured Query Language (SQL) is one programming language used to interact with a relational database, and it is the language used in SQLite. The language supports the ability to define database structure, manipulate data, and read the data contained in the database. 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.
Android Database Best Practices by Adam Stroud