add gobal write_api

src/main/java/sensor2graph/Main.java

@@ -48,6 +48,7 @@ public class Main {
 	
 	public static Driver driver;
 	public static InfluxDBClient influxDBClient;
+	public static WriteApi influxdb_write_api;
 	public static String handle_registry_session_id;
 	public static java.util.logging.Logger glogger;
 	private static java.util.logging.Logger logger;
@@ -93,6 +94,8 @@ public class Main {
 				)
                 .build()
 		).enableGzip();
+
+		influxdb_write_api = influxDBClient.makeWriteApi();
 	}
 
 	private static Set<String> parse_line_separated_values_file(String fname) throws Exception {
@@ -110,7 +113,7 @@ public class Main {
 
 	private static void run() throws Exception {
 		System.out.println("starting influx query");
-		var tables = influxDBClient.getQueryApi().query("from(bucket:\"openforecast\") |> range(start: -600d1m, stop: -600d)");
+		var tables = influxDBClient.getQueryApi().query("from(bucket:\"openforecast\") |> range(start: -600d1h, stop: -600d) |> limit(100)");
 		
 		for (var fluxTable : tables) {
 			System.out.println("table " + fluxTable);