By Adam Stroud

Battle-Tested suggestions for Storing, coping with, and Sharing Android info this is often the 1st consultant to target some of the most serious facets of Android improvement: the best way to successfully shop, retrieve, deal with, and percentage details out of your app’s inner database. via real-world code examples, you could use on your personal apps, you’ll the 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 top Practices attracts on Adam Stroud’s large event top state of the art app initiatives. Stroud experiences the center database idea and SQL innovations 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 atmosphere. via an entire case learn, you’ll tips on how to layout your info entry layer to simplify all elements of information administration and keep away from undesirable technical debt. You’ll additionally locate precise strategies for universal demanding situations in construction data-enabled Android apps, together with matters linked to threading, distant info entry, and displaying information to clients. broad, updated pattern code is on the market for obtain at github.com/android-database-best-practices/device-database.

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Equality (producing a natural join) is just one of the most common cases. Relational Calculus Relational calculus is another relational language that can be used to query and modify a relational model. Codd made the proposal for tuple relational calculus after his paper that introduced the relational model. As discussed previously, relational algebra describes how data should be retrieved. ­Using relational calculus, we can describe what needs to be retrieved and leave the details of how the data is retrieved to the database.

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. While a user does not directly use ­relational algebra or relational calculus to work with a database (higher-level languages are used instead), it is important to have at least a basic understanding of them to better ­comprehend what the higher-level languages are doing.

Because relational calculus is concerned with ­describing what to retrieve, it can be classified as a declarative language. There are two forms of relational calculus: tuple relational calculus and domain ­relational calculus. Both forms are described in the following sections. Tuple Relational Calculus In tuple relational calculus, the tuples of a relation are evaluated against a predicate. The output of an expression is the relation that contains the tuples that make the predicate true. Again, with relational calculus, we only need to specify what we want and let the system determine the best way to fulfill the request.

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Android Database Best Practices by Adam Stroud


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