Added an example of using a database cursor.

Author: ashleydavis

db-cursor-example.js

@@ -0,0 +1,39 @@
+'use strict';
+
+var numRecords = 0;
+
+//
+// Read the entire database, document by document using a database cursor.
+//
+var readDatabase = cursor => {
+    return cursor.next()
+        .then(record => {
+            if (record) {
+                // Found another record.
+                console.log(record);
+                ++numRecords;
+
+                // Read the entire database using an asynchronous recursive traversal.
+                return readDatabase(cursor);
+            }
+            else {
+                // No more records.
+            }
+        });
+};
+
+var MongoClient = require('mongodb').MongoClient;
+MongoClient.connect('mongodb://localhost')
+    .then(client => {
+        var db = client.db('weather_stations');
+        var collection = db.collection('daily_readings');
+        return readDatabase(collection.find()) // NOTE: You could use a query here.
+            .then(() => client.close()); // Close database when done.
+    })
+    .then(() => {
+        console.log("Displayed " + numRecords + " records.");
+    })
+    .catch(err => {
+        console.error("An error occurred reading the database.");
+        console.error(err);
+    });