By Adam Stroud
Battle-Tested suggestions for Storing, handling, and Sharing Android info this is often the 1st consultant to target the most severe elements of Android improvement: tips 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 best 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 top Practices attracts on Adam Stroud’s vast adventure best state of the art app tasks. Stroud stories the center database conception 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 glossy most sensible practices for operating with databases within the Android atmosphere. via a whole case learn, you’ll the way to layout your information entry layer to simplify all aspects of knowledge administration and keep away from undesirable technical debt. You’ll additionally locate exact ideas for universal demanding situations in development data-enabled Android apps, together with matters linked to threading, distant information entry, and exhibiting facts to clients. vast, up to date pattern code is accessible for obtain at github.com/android-database-best-practices/device-database.
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The code creates a view named device_name which includes the model and nickname columns from the device table. Because the SELECT statement has no WHERE clause, all rows from the device table are included in the view. 6 Creating the device_name View CREATE VIEW device_name AS SELECT model, nickname FROM device; Note SELECT statements are covered in more detail later in the chapter. Views in SQLite are read-only and don’t support the DELETE, INSERT, or UPDATE perations. In addition, they cannot be modified with an ALTER statement.
The output relation has the values from the attributes listed in the operand, and the operation removes the duplicates. Like selection, projection is also a unary operation working on a single input relation. 1. 11). Joins The join relations can be considered a class of relations that are similar to the Cartesian product of two operand relations. Usually, a query does not need to return the complete pairing of tuples from the two operands that are produced by the Cartesian product. Instead, it is usually more useful to limit the output relation to only those pairings that meet certain criteria.
SQLite supports the CREATE, ALTER, and DROP commands with regard to tables. These commands allow tables to be created, mutated, and deleted respectively. 1. Next, the statement defines the columns of the table by providing a column name, data type, and any constraints for the column. Constraints place limits on the values that can be stored in a given attribute of a table. 7 CREATE TABLE TEMP IF NOT EXISTS TEMPORARY schema-name . 1 shows a CREATE TABLE statement that creates a table named device with three columns: model, nickname, and display_size_inches.