ITSW 3175 D288 Back-End Programming
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Free ITSW 3175 D288 Back-End Programming Questions
If you need to update a user's email address in a MongoDB collection using the updateOne method, which of the following code snippets correctly demonstrates this operation?
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db.users.updateOne({ username: 'john_doe' }, { $set: { email: '[email protected]' } });
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db.users.updateMany({ username: 'john_doe' }, { $set: { email: '[email protected]' } });
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db.users.updateOne({ email: '[email protected]' }, { $set: { username: 'john_doe' } });
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db.users.update({ username: 'john_doe' }, { $set: { email: '[email protected]' } });
Explanation
Explanation:
The updateOne() method in MongoDB updates a single document that matches the specified filter. In this case, { username: 'john_doe' } identifies the document, and { $set: { email: '[email protected]' } } updates the email field. updateMany() would affect multiple documents, update() is an older method now replaced by updateOne() and updateMany(), and using the wrong filter would update the incorrect field.
Correct Answer:
db.users.updateOne({ username: 'john_doe' }, { $set: { email: '[email protected]' } });
If you need to connect to a MongoDB database hosted on a cloud service, what would you include in the URL parameter of the MongoClient.connect method?
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The name of the database only
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A static URL for local development
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The cloud service's connection string
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The local IP address of the database
Explanation
Explanation:
When connecting to a MongoDB database hosted on a cloud service, the MongoClient.connect method requires the full connection string provided by the service. This URL includes the protocol, username, password, host, port, and database name, allowing the Node.js application to authenticate and connect securely to the remote database. Simply using the database name, a local IP, or a static local URL will not enable connection to a cloud-hosted database.
Correct Answer:
The cloud service's connection string
Describe the primary purpose of a REST API in web development.
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The primary purpose of a REST API is to create user interfaces for applications.
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The primary purpose of a REST API is to enhance the security of web applications.
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The primary purpose of a REST API is to store data in a database.
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The primary purpose of a REST API is to allow different applications to communicate and exchange data over the internet using standard HTTP methods.
Explanation
Explanation:
A REST API (Representational State Transfer Application Programming Interface) provides a standardized way for different applications to communicate over the internet. Using HTTP methods such as GET, POST, PUT, and DELETE, REST APIs allow clients and servers to exchange data, interact with resources, and perform operations on a remote system. The focus of a REST API is on enabling interoperable, stateless communication between systems, not on creating user interfaces or directly enhancing security.
Correct Answer:
The primary purpose of a REST API is to allow different applications to communicate and exchange data over the internet using standard HTTP methods.
Describe the process of establishing a connection between a Node.js application and a MongoDB database.
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You connect by directly embedding the database in the Node.js application.
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You use Express to create a server that connects to the database.
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You establish a connection by using the MongoClient from the MongoDB driver and providing the database URL along with any necessary options.
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You connect by using Mongoose and defining a schema for the database.
Explanation
Explanation:
In Node.js, a connection to MongoDB is typically established using the MongoClient class from the official MongoDB driver. The developer provides the database URL, which specifies the server location, database name, and optionally credentials or options, and then calls the connect() method. This creates a client instance that allows the Node.js application to perform database operations such as reading, writing, updating, and deleting documents. Express is used for routing and server handling, while Mongoose is an optional ODM and not required for basic connections.
Correct Answer:
You establish a connection by using the MongoClient from the MongoDB driver and providing the database URL along with any necessary options.
To delete a document from a collection use the ______ function or the ______ function with a criteria
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clean(), destroyOne()
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destroy(), cleanOne()
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remove(), deleteOne()
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delete(), removeOne()
Explanation
Explanation:
In MongoDB and Mongoose, deleting a document from a collection can be done using either the remove() function or the deleteOne() function, both of which allow specifying criteria to identify the document to be deleted. The remove() function is an older method but still available, whereas deleteOne() is the recommended modern approach for removing a single document. These functions target documents that match the provided filter, ensuring precise deletion without affecting unrelated documents.
Correct Answer:
remove(), deleteOne()
Describe the purpose of the sort() method in MongoDB queries.
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The sort() method is used to arrange the query results in a specified order based on one or more fields.
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The sort() method is used to limit the number of results returned by a query.
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The sort() method is used to filter out unwanted results from a query.
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The sort() method is used to group query results by a specific field.
Explanation
Explanation:
In MongoDB, the sort() method is used to order the results of a query according to one or more fields in either ascending or descending order. This allows developers to control how documents are presented, such as sorting users by age or orders by date. The method does not limit the number of results, filter out documents, or group results; it strictly organizes the output based on the specified sort criteria, enhancing data presentation and usability.
Correct Answer:
The sort() method is used to arrange the query results in a specified order based on one or more fields.
If you need to remove a user document from a MongoDB collection based on their email address, which method would you use and how would you structure the command?
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You would use the updateOne method to change the email address to null.
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You would use the deleteOne method with a filter specifying the email address.
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You would use the find method to locate the document first.
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You would use the insertOne method to add a new document.
Explanation
Explanation:
To remove a single document from a MongoDB collection based on a specific condition, the deleteOne() method is used. You provide a filter object that specifies the field and value to match, such as { email: '[email protected]' }. This method will delete the first document that meets the criteria. Methods like updateOne() or insertOne() do not remove documents, and using find() alone only retrieves the document without deleting it.
Correct Answer:
You would use the deleteOne method with a filter specifying the email address.
Describe the process that the updateOne method follows when updating a document in MongoDB.
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The updateOne method creates a new document if no match is found.
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The updateOne method deletes a document based on a filter.
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The updateOne method locates a document based on a filter and updates it with the provided new data.
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The updateOne method retrieves all documents from the database.
Explanation
Explanation:
The updateOne() method in MongoDB is used to modify a single document that matches a specified filter. The method first searches for a document that satisfies the filter criteria and then applies the update operations provided, such as $set to change field values. This allows precise updates to individual documents without affecting others in the collection. Unlike insertOne(), it does not create a new document by default unless upsert is specified, and it does not delete or retrieve all documents.
Correct Answer:
The updateOne method locates a document based on a filter and updates it with the provided new data.
Describe the purpose of the updateOne() method in MongoDB.
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The updateOne() method creates a new document in a collection.
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The updateOne() method deletes a document from a collection.
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The updateOne() method is used to find a single document in a collection and update it with new data.
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The updateOne() method retrieves all documents from a collection.
Explanation
Explanation:
The updateOne() method in MongoDB is used to update a single document that matches a specified filter. It allows you to modify one or more fields in the document using update operators such as $set, $inc, or $push. This method does not create, delete, or retrieve documents; its specific role is to locate one matching document and apply the provided updates to it.
Correct Answer:
The updateOne() method is used to find a single document in a collection and update it with new data.
What is Node.js?
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A front-end JavaScript framework.
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A programming language.
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A back-end JavaScript runtime environment.
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A database management system.
Explanation
Explanation:
Node.js is a back-end JavaScript runtime environment that allows developers to execute JavaScript code on the server side. It is built on Chrome's V8 engine and enables the development of scalable network applications, including web servers and APIs. Unlike front-end frameworks or databases, Node.js focuses on server-side operations, event-driven programming, and asynchronous I/O to handle multiple requests efficiently.
Correct Answer:
A back-end JavaScript runtime environment.
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