Ndtyjky

I have a local MongoDB database running on WAMP on Windows 10. I'm using PHP version 7.2.10, Apache 2.4.35, and MongoDB extension 1.5.3. I have a pretty simple web application that I'm testing, and when I try to send data to my database via a php script, I get this error:

PHP Notice:  Undefined property: MongoDBDriverManager::$db in 

C:wamp64wwwphptest.php

Relevant parts of test.php, the file in question, look like this:

$objectId = new MongoDBBSONObjectId();

$dbhost = "127.0.0.1:27017";

$dbname = "db";

$m = new MongoDBDriverManager("mongodb://localhost:27017");

var_dump($m);

$db = $m->$dbname;

The property being undefined results in another error: Fatal error: Uncaught Error: Call to a member function selectCollection() on null which causes the script to fail.

What is causing the property MongoDBDriverManager::$db to be undefined?

Working php code looks such as the following. Please, pay attention to the presence a link to 'vendor/autoload.php':

  $DB_CONNECTION_STRING="mongodb://YourCredentials";

  require '../../vendor/autoload.php';

  $manager = new MongoDBDriverManager( $DB_CONNECTION_STRING );

Then if you use MongoDBDriverManager, a modern version of MongoDB driver, your CRUD operations will look such as this:

Create a document in the collection:

$bulkWrite=new MongoDBDriverBulkWrite;

$doc=['name' => 'John', age => 33, profession => 'Guess what?'];

$bulkWrite->insert($doc);

$manager->executeBulkWrite('db.MyCollection', $bulkWrite);

Read document in the collection by name with a limit:

$filter = ['name' => 'John'];

$options = [ 'limit' => 2 ];

$query = new MongoDBDriverQuery($filter, $options);

$manager->executeQuery('db.MyCollection', $query);

Read document in the collection by MongoDb _id with a limit:

$filter = ['_id' => new MongoDBBSONObjectID( '5bdf54e6d722dc000f0aa6c2' )];

$options = [ 'limit' => 2 ];

$query = new MongoDBDriverQuery($filter, $options);

$manager->executeQuery('db.MyCollection', $query);    

Update document in the collection: (Read more about options upsert and multi here)

$bulkWrite=new MongoDBDriverBulkWrite;

$filter = ['name' => 'John'];

$update = ['$set' => ['name' => 'Smith', age: 35, profession => 'Guess what?']];

$options = array('multi' => false, 'upsert' => false);

$bulkWrite->update($filter, $options);

$manager->executeBulkWrite('db.MyCollection', $bulkWrite);    

Delete document in the collection - Delete:

$bulkWrite=new MongoDBDriverBulkWrite;

$filter= ['name' => 'John', age => 35];

$options = [ 'limit' => 1 ];

$bulkWrite->delete($filter, $options);

$manager->executeBulkWrite('db.MyCollection', $bulkWrite);