Merge branch 'master' into skysql_field

orders/src/routes/ordersRoutes.js

@@ -10,6 +10,7 @@ router.get("/", async (req, res, next) => {
     let read_count = req.query.r;
     let write_count = req.query.w;
     let connection_id = req.query.c;
+
     let conn;
     try {
         // Establish connection to SkySQL using the db.js module
@@ -29,17 +30,32 @@ router.get("/", async (req, res, next) => {
             writes += "insert into orders (description) values('order - " + transaction_id + "');";
         }
 
-        // Start latency timer
-        var start = Date.now();
+        var promises = [];
 
-        // Asynchronously execute read and write queries
-        await Promise.all([conn.query(reads), conn.query(writes)]);
+        if (read_count > 0) {
+            promises.push(conn.query(reads));
+        }
 
-        // Calculate latency 
-        var delta = Date.now() - start;
+        if (write_count > 0) {
+            promises.push(conn.query(writes));
+        }
 
-        // Return the results
-        res.send({ execution_time: delta });
+        if (promises.length > 0) {
+                // Start latency timer
+                 var start = Date.now();
+
+                // Asynchronously execute read and write queries
+                await Promise.all(promises);
+
+                // Calculate latency 
+                var delta = Date.now() - start;
+
+                // Return the results
+                res.send({ execution_time: delta });
+        }
+        else {
+            res.send({ execution_time: 0.0 });
+        }
     } catch (err) {
         throw err;
     } finally {