Insert.kt

 //Insert Case
        val thread = Thread {
            var bookEntity = BookEntity()
            bookEntity.bookId = 1
            bookEntity.bookName = "Kotlin for Android Developer"

            db.bookDao().saveBooks(bookEntity)

            //fetch Records
            db.bookDao().getAllBooks().forEach()
            {
                Log.i("Fetch Records", "Id:  : ${it.bookId}")
                Log.i("Fetch Records", "Name:  : ${it.bookName}")
            }
        }
        thread.start()