Download Android Database Best Practices by Adam Stroud PDF

By Adam Stroud

Battle-Tested suggestions for Storing, dealing with, and Sharing Android information this is often the 1st consultant to target essentially the most serious points of Android improvement: easy methods 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 the right way 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 wide event prime state of the art app tasks. Stroud experiences the center database thought and SQL options you want to successfully construct, manage, and skim 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 surroundings. via a whole case learn, you’ll the best way to layout your facts entry layer to simplify all points of information administration and steer clear of undesirable technical debt. You’ll additionally locate specific suggestions for universal demanding situations in construction data-enabled Android apps, together with matters linked to threading, distant info entry, and exhibiting facts to clients. vast, up to date pattern code is accessible for obtain at

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For example, a trigger can be created to run an SQL statement whenever a row is added or deleted in the database. CREATE TRIGGER Like other CREATE statements discussed previously, the CREATE TRIGGER ­statement ­assigns a name to a trigger by providing the name to the CREATE TRIGGER ­statement. DROP VIEW IF EXISTS schema-name . org view-name Data Definition Language After the name, an indication of when the trigger needs to run is defined. This ­definition of when a trigger should run has two parts: the operation that causes the trigger to run, and when the trigger should run in relation to that operation.

This means that in WAL mode, a commit can occur without ever actually touching the main database file. Allowing commits to occur without a need to change the database file allows read and write operations to be performed simultaneously because they are performed on two different files. The read operation is performed on the main database file and the write operation is performed on the WAL file. At some point the data from the WAL file needs to be added to the main database file. This is called a checkpoint.

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.

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