Download PDF by Adam Stroud: Android Database Best Practices

By Adam Stroud

Battle-Tested techniques for Storing, coping with, and Sharing Android information this can be the 1st consultant to target some of the most serious elements of Android improvement: how you can successfully shop, retrieve, deal with, and proportion details out of your app’s inner database. via real-world code examples, that you would be able to use on your personal apps, you’ll how you can 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 large adventure top state-of-the-art app tasks. Stroud stories the middle database thought and SQL concepts you must successfully construct, manage, 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 setting. via a whole case examine, 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 special options for universal demanding situations in development data-enabled Android apps, together with concerns linked to threading, distant facts entry, and exhibiting facts to clients. large, up to date pattern code is accessible for obtain at github.com/android-database-best-practices/device-database.

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6). It can be thought of as an “or” operation in that the output ­relation has all the members that are in either relation A OR relation B. 7). 8). 9). The degree of the output relation is the sum of the degree of each operand relation. The cardinality of the output relation is the product of the cardinalities of the input relations. In our example, both relations A and B have a degree of 1. Therefore, the output relation has a degree of 1 + 1 = 2. Similarly, both relations A and B have a cardinality of three, so the output ­relation has a degree of 3 * 3 = 9.

Tables, attributes, tuples, and domains provide a way to format the data so it fits the model, but we also need a way to both query and manipulate that model. The two languages most used to manipulate a relational model are relational algebra and relational calculus. While relational algebra and relational calculus seem different, it is important to remember that they are equivalent. Any expression that can be written in one can also be written in the other. Relational calculus, and to some extent relational algebra, is the basis for higherlevel manipulation languages like SQL and SEQUEL.

Relational Languages Thus far in the discussion of the relational model, we have focused on model structure. Tables, attributes, tuples, and domains provide a way to format the data so it fits the model, but we also need a way to both query and manipulate that model. The two languages most used to manipulate a relational model are relational algebra and relational calculus. While relational algebra and relational calculus seem different, it is important to remember that they are equivalent. Any expression that can be written in one can also be written in the other.

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Android Database Best Practices by Adam Stroud


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