Android Database Best Practices by Adam Stroud

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By Adam Stroud

Battle-Tested concepts for Storing, handling, and Sharing Android facts this can be the 1st advisor to target probably the most severe facets of Android improvement: find out how to successfully shop, retrieve, deal with, and percentage info out of your app’s inner database. via real-world code examples, you can use on your personal apps, you’ll methods to take complete benefit of SQLite and the database-related periods on Android. part of Addison-Wesley’s Android™ Deep Dive sequence for knowledgeable Android builders, Android Database top Practices attracts on Adam Stroud’s huge event best state of the art app initiatives. Stroud studies the center database idea and SQL thoughts you must 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 atmosphere. via an entire case research, you’ll easy methods to layout your information entry layer to simplify all features of information administration and keep away from undesirable technical debt. You’ll additionally locate distinctive ideas for universal demanding situations in construction data-enabled Android apps, together with concerns linked to threading, distant facts entry, and displaying information to clients. huge, updated pattern code is offered for obtain at

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In a lot of cases, it may be better for the app to move certain logic to the application code rather than add the same functionality in a trigger. Data Manipulation Language Data Manipulation Language (DML) is used to read and modify the data in a database. This includes inserting and updating rows in tables. Once the structure of the database has been defined with DDL, DML can be used to alter the data in the table. The main ­difference between DDL and DML is that DDL is used to define the structure of the data in a database, whereas DML is used to process the data itself.

40 Chapter 3 An Introduction to SQLite Where SQLite differs from other database systems is in what it does not support as well as the way it implements data types. It has limited support for the JOIN operations as well as ALTER TABLE operations. Data types in SQLite are also more fluid than those found in other systems. Foreign Key Support SQLite supports foreign key constraints across tables to help ensure data integrity. Using foreign key constraints can help ensure that changes to the database span multiple tables when UPDATE or DELETE operations are performed.

This chapter covers three areas of SQL: ■■ ■■ ■■ Data Definition Language (DDL) Data Manipulation Language (DML) Queries Each area has a different role in a database management system (DBMS) and a different subset of commands and language features. Data Definition Language Data Definition Language (DDL) is used to define the structure of a database. This ­includes the creation, modification, and removal of database objects such as tables, views, triggers, and indexes. The entire collection of DDL statements defines the schema for the database.

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