By Adam Stroud

Battle-Tested techniques for Storing, handling, and Sharing Android information this can be the 1st consultant to target the most serious facets of Android improvement: tips on how to successfully shop, retrieve, deal with, and percentage details out of your app’s inner database. via real-world code examples, you could use on your personal apps, you’ll tips on how to 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 broad event prime state of the art app initiatives. Stroud studies the middle database concept and SQL recommendations you must successfully construct, control, and skim 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 surroundings. via an entire case learn, you’ll the way to layout your info entry layer to simplify all points of information administration and steer clear of undesirable technical debt. You’ll additionally locate distinct recommendations for universal demanding situations in development data-enabled Android apps, together with matters linked to threading, distant information entry, and exhibiting info to clients. broad, updated pattern code is out there for obtain at github.com/android-database-best-practices/device-database.

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This is because the column was added after the table was created and the ALTER TABLE statement did not specify a default value to add to existing rows. 6 shows the rows that are now in the device table. 7 4 2015-07-13 04:52:20 Data Definition Language Notice that the new row has a timestamp to indicate when it was added. This column was populated by the insert_date trigger automatically when the INSERT statement was run. Let’s dive a little deeper into the details of the trigger to explore how it works.

Org The previous sections provided an overview of the DDL that is supported by SQLite. Using the DDL, it is possible to define database objects that can be used to store data in a local database. The next section discusses ways to manipulate data that can be stored in a database. Warning While triggers can be an attractive feature of SQL, it is important to understand that they are not without their faults. Because the database runs a trigger automatically in response to an action performed on the database, a trigger may produce unexpected side effects.

Instead, it is usually more useful to limit the output relation to only those pairings that meet certain criteria. This is where the different join operations are useful. Natural join is a useful join variant as it conceptually allows two relations to be ­combined into a single relation connecting the relations over a set of common attributes. version attributes from each of the input relations. 12. 2. By using a join operation, we are now able to perform additional operations on the output relation to produce the same results that would have been obtained if the data was combined in one table.

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