By Adam Stroud
Battle-Tested techniques for Storing, coping with, and Sharing Android facts this is often the 1st consultant to target the most severe facets of Android improvement: how you can successfully shop, retrieve, deal with, and proportion info out of your app’s inner database. via real-world code examples, that you may use on your personal apps, you’ll tips on how to 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 huge event prime state of the art app initiatives. Stroud reports the middle database idea and SQL concepts you want to successfully construct, manage, and browse SQLite databases. He explores SQLite intimately, illuminates Android’s APIs for database interplay, and stocks smooth top practices for operating with databases within the Android atmosphere. via an entire case examine, you’ll how one can layout your facts entry layer to simplify all aspects of knowledge administration and steer clear of undesirable technical debt. You’ll additionally locate distinctive suggestions for universal demanding situations in construction data-enabled Android apps, together with matters linked to threading, distant facts entry, and exhibiting information to clients. huge, up to date pattern code is on the market for obtain at github.com/android-database-best-practices/device-database.
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Extra resources for Android Database Best Practices
It was shipped as part of the Ingres DBMS and has roots in POSTQUEL which was shipped with early versions of the Postgres database. QUEL was included as part of early relational databases but has more recently been supplanted by SQL in most modern relational database systems. SEQUEL Structured English QUEry Language (SEQUEL) was the name given to SQL when it was originally developed by IBM. However, due to trademark infringements, the name was shortened to Structured Query Language (SQL). SEQUEL was the first commercial language to be implemented based on Codd’s ALPHA language.
The NOT NULL constraint causes SQLite to throw an error if there is an attempt to insert a row into the table that contains a null value for the model column. At this point, the table can be used to store and retrieve data. However, as time passes, it is often necessary to make changes to existing tables to support the changing needs of software. This is done with an ALTER TABLE statement. ALTER TABLE The ALTER TABLE statement can be used to modify an existing table by either adding new columns or renaming the table.
18 Inserting Manufacturers INSERT INTO manufacturer (short_name, long_name) VALUES ("HTC", "HTC Corporation"); INSERT INTO manufacturer (short_name, long_name) VALUES ("Samsung", "Samsung Electronics"); INSERT INTO manufacturer (short_name, long_name) VALUES ("LG", "LG Electronics"); In order to “link” the tables together, the device table needs to have a column added to reference the id from the manufacturer table. 19 shows the ALTER TABLE statement that adds the column as well as the U PDATE TABLE statements that update the rows in the device table.
Android Database Best Practices by Adam Stroud