Download Android Database Best Practices by Adam Stroud PDF

By Adam Stroud

Battle-Tested ideas for Storing, handling, and Sharing Android facts this is often the 1st advisor to target probably the most severe elements of Android improvement: easy methods to successfully shop, retrieve, deal with, and percentage details out of your app’s inner database. via real-world code examples, that you may 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 skilled Android builders, Android Database most sensible Practices attracts on Adam Stroud’s vast adventure top state of the art app tasks. Stroud studies the center database conception and SQL ideas you must successfully construct, control, and browse SQLite databases. He explores SQLite intimately, illuminates Android’s APIs for database interplay, and stocks sleek most sensible practices for operating with databases within the Android atmosphere. via an entire case learn, you’ll easy methods to layout your facts entry layer to simplify all elements of knowledge administration and keep away from undesirable technical debt. You’ll additionally locate designated suggestions for universal demanding situations in development data-enabled Android apps, together with matters linked to threading, distant facts entry, and exhibiting facts to clients. broad, updated pattern code is offered for obtain at github.com/android-database-best-practices/device-database.

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For now, it is enough to know that TEXT represents a text string and REAL a floating-point number. 1 is run and returns without an error, the d­ evice table is created with three columns: model, nickname, and display_size_inches of types TEXT, TEXT, and REAL respectively. In addition, the table has a c­ onstraint on the model column to ensure that every row has a non-null model name. The constraint is created by appending NOT NULL to the end of the column name in the CREATE statement. 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.

If a WHERE clause is not present in the UPDATE ­statement, all rows of the table will be manipulated. 11 shows an overview of the UPDATE statement. 11 shows an example of an UPDATE statement that processes all rows of a table. The UPDATE statement sets the model column to “Nexus” for all rows of the table. 12 makes use of the WHERE clause to update specific rows of the table. The ­UPDATE statement sets the model name to “Nexus 4” for all rows that have a device_size_inches greater than 4. 12, is used to remove rows from a table.

9, it takes the name of the trigger that should be removed and deletes it. 9 removes the insert_date trigger. 9 Removing the DROP TRIGGER Statement DROP TRIGGER insert_date; 27 28 Chapter 2 An Introduction to SQL DROP TRIGGER IF EXISTS schema-name . 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.

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