Added ability to download CSV of data series

www/functions_SQLite.js

@@ -122,6 +122,37 @@ exports.seriesTagValues = function(req, res){
 	});
 };
 
+exports.seriesCSV = function(req, res){
+	var sqlite3 = require('sqlite3').verbose();
+	var db = new sqlite3.Database(dbFile);
+
+	db.serialize(function(){
+		var query = "SELECT * FROM vals WHERE tagID = ? AND dateAdded > DATETIME('now', '-1 HOUR')";
+		var prepQuery = db.prepare(query);
+		prepQuery.all(parseInt(req.params.tag), function(err, rows){
+			prepQuery.finalize();
+			db.close();
+			if (err){
+				console.log(err);
+				res.json({status:"error", message:err, query:query});
+			} else {
+				var csvString = "";
+
+				for (var i= 0; i < rows.length; i++){
+					var r = [rows[i].id, rows[i].val, rows[i].dateAdded];
+					csvString = csvString + r.join(",") + "\r";
+				}
+
+				res.set('Content-Type', 'text/csv');
+				res.set('Content-Disposition', "attachment;filename=tagdata.csv");
+				res.send(csvString);
+			}
+		})
+	});
+
+
+}
+
 exports.latestValueSingleTag = function(req, res){
 	var sqlite3 = require('sqlite3').verbose();
 	var db = new sqlite3.Database(dbFile);