<Validating data from a database> I am trying to c...

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Validating data from a database
I am trying to create a registration screen. When the registration button is pressed, I want the program to check if the provided username already exists in the database. Is it does, it will not proceed with the registration. Problem is, I cannot, find a way to access the data. Here's the related code
'''@Database(entities = arrayOf(User::class), version = 1)
abstract class UsersDatabase : RoomDatabase() {
abstract fun usersDao(): UsersDao

companion object {
@Volatile
private var...