src/main/java/com/conveyal/gtfs/GTFS.java
public static FeedLoadResult export (String feedId, String outFile, DataSource dataSource, boolean fromEditor) {
        JdbcGtfsExporter exporter = new JdbcGtfsExporter(feedId, outFile, dataSource, fromEditor);
        FeedLoadResult result = exporter.exportTables();
        return result;
    }
public static FeedLoadResult export (String feedId, String outFile, DataSource dataSource, boolean fromEditor) {
        JdbcGtfsExporter exporter = new JdbcGtfsExporter(feedId, outFile, dataSource, fromEditor);
        FeedLoadResult result = exporter.exportTables();
        return result;
    }
Export a feed ID from the database to a zipped GTFS file in the specified export directory.