In this article, we are going to check if a collection exists on a MongoDB database, and also we will look at an example that is relevant to the topic to make the topic easier. For this purpose, we are going to use Node.js. Check if a Collection Exists in MongoDB Using NodeJS ...
Reach out to MongoDB Let’s chat Investors Visit our investor portal Learn more Pricing Working with DataDrivers Winnie_Pooh(Winnie Pooh)January 10, 2022, 12:08pm1 I do this way: var collection2 = _database.GetCollection(“cap2”); ...
Before answering this question, I would first like to explain how concurrency works in MongoDB, inside and outside of transactions. Knowing this helps understand the answer. Locking MongoDB uses multi-granularity locking that allow shared access to a resource, such as a database or collection. ...
IfmyCollectiondoes not exist, the command creates it during the insert process. Compared to the previous method, the insert process quickly creates a collection and adds data in a single step. Conclusion This guide showed two methods for creating a collection in MongoDB. A collection organizes d...
In the MongoDB database, the $lookup aggregate stage performs the left outer join with the other collection and also filters information (data) from the joined documents. For instance, we use the query to get all users’ information with their addresses. The $lookup function accepts four field...
Now let’s try to drop and backup the database. Drop database command: db.dropDatabase() Restore database command: mongorestore Let’s check the database and collection and data inside collection Backup and Restore Database Collection Let’s create another backup folder called “Backup_Collect...
collection in MongoDB by using the MongoDB atlas cluster, for enforcing the document schema we need first to connect the database and collection. We can also create schema structure of collection by using create collection command, also we can check the index and collection field in MongoDB. ...
// Remove the _id field from each record as MongoDB will generate this for you and // you can't have a duplicate. // Save the record. // This assumes that the collection does not have any unique keys set on any of the // other fields. ...
The primary change in migrating from a Relational Database to MongoDB is the way in which the data is modeled. In MongoDB, different documents within a collection can have different schemas. For instance, one document can have 3 fields and the other document can have 5 fields. MongoDB supp...
We can check it worked by having a look at the content of the “stitch.movies” collection in our MongoDB Atlas Cluster: Now that we can insert a new document into MongoDB Atlas using Stitch, we are going to create the trigger.