By Adam Stroud
Battle-Tested techniques for Storing, handling, and Sharing Android facts this is often the 1st advisor to target some of the most serious points 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, which you could use on your personal apps, you’ll take complete good thing about SQLite and the database-related periods 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 initiatives. Stroud experiences the middle database concept and SQL suggestions you want to successfully construct, control, 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 research, you’ll easy methods to layout your information entry layer to simplify all features of information administration and keep away from undesirable technical debt. You’ll additionally locate targeted strategies for universal demanding situations in development data-enabled Android apps, together with matters linked to threading, distant info entry, and exhibiting 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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Therefore, the output relation has a degree of 1 + 1 = 2. Similarly, both relations A and B have a cardinality of three, so the output relation has a degree of 3 * 3 = 9. Selection (σpredicate (A)) Selection produces a relation with only the tuples from the operand that satisfy a given predicate. Remember that, unlike the previous operations, selection is a unary operation and operates on only a single relation. As an example of the selection operation, we again consider the os relation from earlier in the chapter.
2. For these versions of Android, database integrity can be maintained by using either triggers or having the application code perform all the necessary database actions when rows are either updated or deleted. 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
This means that views can be queried but do not support the DELETE, INSERT, or UPDATE operations. 6. In addition to a name, the CREATE VIEW statement includes a way to define the content of the view. 4 Device Name View model nickname Nexus One Nexus S Galaxy Nexus Nexus 4 Passion Crespo Toro Mako VIEW CREATE TEMP IF NOT EXISTS TEMPORARY AS view-name schema-name . org select-stmt 23 24 Chapter 2 An Introduction to SQL to be included in the view as well as places limits on which rows should be included in the view.