How do I interact with a database in Kotlin? What are the recommended approaches for a maintainable architecture? For example, is it possible to work with raw SQL queries without using an ORM? And how much do Coroutines simplify this process?
How do you perform database operations with Kotlin?
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You might think you're diving into Room + ORM and struggling with performance issues, but in Kotlin, you can actually proceed quite cleanly with direct SQLite queries. For example, when converting Java's classic `SQLiteOpenHelper` approach to Kotlin, the code becomes much more readable thanks to extension functions and the nullable type system. While the advantage of using SQLite directly is avoiding the unnecessary code generated in the background by an ORM, you do have to manually manage transactions, where Coroutines come into play.
With Coroutines, you can start queries running on `Dispatchers.IO` and easily observe their results using tools like `androidx.lifecycle:livedata-ktx`. For instance, you can set up a structure that continuously monitors the database within a `flow`, giving you fine-grained control that you can't achieve with an ORM. You could set up the same structure in Java using `RxJava`, but with Coroutines' scoping and cancellation features, you reduce the risk of memory leaks to zero.
You can use Room, an ORM library in Kotlin. You can also work directly with the `SqliteDatabase` class for raw SQL queries, but Room is cleaner and more efficient. With coroutines and `suspend` functions, you can easily make database operations asynchronous.