How does one export a Room table to a CSV format?

Question

I have an app right now that stores data in a Room database using several entities. What I need is to take the contents of a table, convert the data into a CSV format, and then

Answer 1

It's really easy to export Room DB table to CSV file in Kotlin using kotlin-csv library.

Just get the list of DB table objects:

@Dao
interface DirectorDao {
    @get:Query("SELECT * FROM director ORDER BY full_name ASC")
    val allDirectors: LiveData>
}

Then user CSV writer to write into the file by going through all list items and adding the column values to CSV rows, one by one, like this:

csvWriter().open(csvFile) {
    // Header
    writeRow(listOf("[id]", "[name]", "[age]"))

    directorDao.allDirectors.value.forEachIndexed { index, director ->
        writeRow(listOf(index, director.fullName, director.age))
    }
}

I explain the whole flow here.