![]() ![]() The schema you’ll define is going to create a database called todoitems.db, with one table inside. These can be organized into subclasses for databases with multiple tables and should be visible throughout the scope of the project. It’s good practice to define constants that describe the database schema in a self-documenting way in their own class or file. The schema is the formal declaration of how the data in a database is structured. The first step to creating an app that reads from a SQLite database is to decide on a database schema. Overall, this section will give you a greater understanding and appreciation for the new and improved Room Persistence Libraries. However, if you have never seen an app that utilizes the SQLite APIs, this section will show you an example of how to use them in your apps. If you have written an app in the past that utilizes the SQLite APIs in Java, this chapter will show you how to use them with Kotlin, instead. Another is that you need to write a lot of boilerplate code to connect and transform SQL queries and data objects. One disadvantage to using the SQLite APIs is that there is no compile-time verification of the raw SQL queries, and if the database structure changes, the affected queries have to be updated manually. Currently, it’s recommended to use the Room Persistence Library instead, which will provide an abstraction layer for accessing the data in your app’s SQLite databases.
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