Let's create an interface named UserDAO.kt, and annotated with @DAO annotation. This will help Room to identify the DAO class. Here is the code for the DAO interface:

@Dao
interface UserDAO

In this interface, we will create functions that will be responsible for inserting, deleting, and getting the user details:

@Insert
fun addNewUser(users: Users)

In the preceding code, @Insert is used to insert a user:

@Query("DELETE FROM USERS")
fun deleteAllUsers()

In the previous code, @Query("DELETE FROM USERS") is used to delete all the users from the USERS table:

@Query("SELECT * FROM USERS")
fun getAllUsers():  List<Users>

In this code, @Query("SELECT * FROM USERS") is used to get all the users as a list from the USERS table.