DOCSP-49686: Check for no results before printing

Author: norareidy

source/get-started.txt

@@ -306,9 +306,9 @@ Run a Sample Query
          "title" : "The Shawshank Redemption", 
          ...
 
-      If you encounter an error or see no output, ensure that you specified the
-      proper connection string in the ``quickstart.cpp`` file and that you loaded the
-      sample data.
+      If you encounter an error or if your application prints ``"No result found"``,
+      ensure that you specified the proper connection string in the ``quickstart.cpp``
+      file and that you loaded the sample data.
 
 After you complete these steps, you have a working application that
 uses the driver to connect to your MongoDB deployment, runs a query on

source/includes/get-started/quickstart.cpp

@@ -19,6 +19,9 @@ int main() {
     auto collection = db["movies"];
 
     auto result = collection.find_one(make_document(kvp("title", "The Shawshank Redemption")));
-    std::cout << bsoncxx::to_json(*result) << std::endl;
-
+    if (result) {
+        std::cout << bsoncxx::to_json(*result) << std::endl;
+    } else {
+        std::cout << "No result found" << std::endl;
+    }
 }

source/includes/read/retrieve.cpp

@@ -25,7 +25,11 @@ int main() {
     // Retrieves and prints one document that has a "name" value of "LinkedIn"
     // start-find-one
     auto result = collection.find_one(make_document(kvp("name", "LinkedIn")));
-    std::cout << bsoncxx::to_json(*result) << std::endl;
+    if (result) {
+        std::cout << bsoncxx::to_json(*result) << std::endl;
+    } else {
+        std::cout << "No result found" << std::endl;
+    }
     // end-find-one
 
     // Retrieves documents that have a "founded_year" value of 1970

source/includes/usage-examples/read-code-examples.cpp

@@ -23,7 +23,11 @@ int main() {
         // Retrieves one document that matches a query filter
         // start-find-one
         auto result = collection.find_one(make_document(kvp("<field name>", "<value>")));
-        std::cout << bsoncxx::to_json(*result) << std::endl;
+        if (result) {
+            std::cout << bsoncxx::to_json(*result) << std::endl;
+        } else {
+            std::cout << "No result found" << std::endl;
+        }
         // end-find-one
     }