Verify if a document is present within the collection; if not, insert a new document

Question

Verify if a document is present within the collection; if not, insert a new document

I am currently using PHP and MongoDB to save songs that users add through a basic form. The structure of the collection I have created is as follows.

$object = array(
    "trackName" => "Sju sorger",
    "artistName" => "Veronica Maggio",
    "albumName" => "Satan i Gatan",
     );
$collection->save($object);

My goal is to check whether a song already exists in the collection. If the user is attempting to add a song that is not already in the collection, it will be added. However, if the song is already present, a message indicating that the song is already in the collection will be displayed.

As someone who is new to MongoDB, I believe I can achieve this by checking the _id of the document. Nevertheless, I am unsure of how to go about doing so.

Any assistance on this matter would be greatly appreciated.

php mongodb mongoid

Answer 1

Answer №1

Try out this method.

  <?php
    try {
      // establish a connection with the MongoDB server
      $conn = new Mongo('localhost');

      // access the database
      $db = $conn->test;

      // access the collection
      $collection = $db->items;

      // FETCH TRACK NAME
      $trackname = 'placetracknamehereifsearchingbytrackname';
      // retrieve an existing document
      $criteria = array(
        'trackName' => trackname ,
      );
      $doc = $collection->findOne($criteria);

      if(!empty($doc) {
         echo 'Data Already Exist';
      } else {
  // insert a new document
  $object = array(
    "trackName" => "Sju sorger",
    "artistName" => "Veronica Maggio",
    "albumName" => "Satan i Gatan",
     );
     $collection->save($object);
     echo 'Added Successfully!';
}
      // disconnect from the server
      $conn->close();
    } catch (MongoConnectionException $e) {
      die('Error connecting to MongoDB server');
    } catch (MongoException $e) {
      die('Error: ' . $e->getMessage());
    }
    ?>

refer to this source for more information.

Mongo Resource

Answer 2

Try out this method.

  <?php
    try {
      // establish a connection with the MongoDB server
      $conn = new Mongo('localhost');

      // access the database
      $db = $conn->test;

      // access the collection
      $collection = $db->items;

      // FETCH TRACK NAME
      $trackname = 'placetracknamehereifsearchingbytrackname';
      // retrieve an existing document
      $criteria = array(
        'trackName' => trackname ,
      );
      $doc = $collection->findOne($criteria);

      if(!empty($doc) {
         echo 'Data Already Exist';
      } else {
  // insert a new document
  $object = array(
    "trackName" => "Sju sorger",
    "artistName" => "Veronica Maggio",
    "albumName" => "Satan i Gatan",
     );
     $collection->save($object);
     echo 'Added Successfully!';
}
      // disconnect from the server
      $conn->close();
    } catch (MongoConnectionException $e) {
      die('Error connecting to MongoDB server');
    } catch (MongoException $e) {
      die('Error: ' . $e->getMessage());
    }
    ?>

refer to this source for more information.

Mongo Resource

Answer 3

Answer №2

Currently, the most effective approach is to utilize the upsert option within the update operation in MongoDB. This feature allows for either inserting or updating data and ensures atomicity - a quality lacking in the example provided. To determine whether the document has been replaced, one can monitor the nUpserted value of the WriteResult

For more information, please visit:

https://docs.mongodb.com/manual/reference/method/db.collection.update/#upsert-option

https://docs.mongodb.com/manual/reference/method/WriteResult/#WriteResult.nUpserted

Despite its age, this question continues to appear in search results and has been referenced in previous discussions.

Answer 4

Currently, the most effective approach is to utilize the upsert option within the update operation in MongoDB. This feature allows for either inserting or updating data and ensures atomicity - a quality lacking in the example provided. To determine whether the document has been replaced, one can monitor the nUpserted value of the WriteResult

For more information, please visit:

https://docs.mongodb.com/manual/reference/method/db.collection.update/#upsert-option

https://docs.mongodb.com/manual/reference/method/WriteResult/#WriteResult.nUpserted

Despite its age, this question continues to appear in search results and has been referenced in previous discussions.

Verify if a document is present within the collection; if not, insert a new document

Answer №1

Answer №2

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