MongoDB provides high performance data persistence. In particular, Support for embedded data models reduces I/O activity on database system. Indexes support faster queries and can include keys from embedded documents and arrays. Query API The MongoDB Query API supports read and write operations (CR...
A record in MongoDB is a document, which is a data structure composed of field and value pairs. MongoDB documents are similar to JSON objects. The values of fields may include other documents, arrays, and arrays of documents. The advantages of using documents are: ...
MongoDB -- from "humongous" -- is an open source, non-relational, document-oriented database. The goal of the MongoDB project is to bridge the gap between key-value stores (which are fast and highly scalable) and traditional RDBMS systems (which provide rich queries and deep functionality)...
MongoDB is an open-source database which is available as a cloud-based service or as anon-premisessoftware product. The cloud service,MongoDB Atlas, provides multiple subscription tiers that can support small to enterprise-scale workloads. The on-premises solution,MongoDB Server, can run on Wind...
If thesizefield is less than or equal to 4096, then the collection will have a cap of 4096 bytes. Otherwise, MongoDB will raise the provided size to make it an integer multiple of 256. Additionally, you may also specify a maximum number of documents for the collection using themaxfield ...
Similarly,we can create more complex derived queries by chaining multiple conditions: We declare the above to find allactiveauthordocuments with at least a given number of articles. Spring Data MongoDB will generate a query where the value of theactivefield istrueand thearticle_countis greater tha...
db.people.insert( { name : "Sally", age : undefined } ) The following queries return an error: db.people.find( { age : undefined } ) db.people.find( { age : { $gte : undefined } } ) However, you can query for undefined values using$type, as in: ...
MongoDB documents are similar to JSON objects. The values of fields may include other documents, arrays, and arrays of documents. {"_id":ObjectId("54c955492b7c8eb21818bd09"),"address":{"street":"2 Avenue","zipcode":"10075","building":"1480","coord":[-73.9557413,40.7720266]},"borough...
11. Conclusion In this tutorial, we’ve seen how we can use ReactiveMongo to run queries on MongoDB. We’ve covered the most common and widely used parts of ReactiveMongo. As always, the sample code is availableover on GitHub.
MongoDB: // Creating a document db.CollectionName.insertOne({ field1: "value1", field2: "value2" });// Retrieve the documents db.CollectionName.find({ field1: "value1" });// Update a document db.CollectionName.updateOne( { field1: "value1" }, { $set: { field2: "newValue"...