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MongoDB Bulk Operations

Converting a field to another type and updating the entire collection in Bulk Usually the case when one wants to change a field type to another, for instance the original …

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Mongo Indexes

Index Creation Basics See the below transactions collection. > db.transactions.insert({ cr_dr : "D", amount : 100, fee : 2}); > db.transactions.insert({ cr_dr : "C", amount : 100, fee : 2}); …

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MongoDB Aggregation

Parameter Details pipeline array(A sequence of data aggregation operations or stages)options document(optional, available only if pipeline present as an array) Aggregations operations process data records and return computed results. Aggregation …

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MongoDB Collections

Create a Collection First Select Or Create a database. use mydbswitched to db mydb Using db.createCollection(“yourCollectionName“) method you can explicitly create Collection. > db.createCollection("newCollection1") { "ok" : 1 } Using …

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Upserts and Inserts

Insert a document _id is a 12 bytes hexadecimal number which assures the uniqueness of every document. You can provide _id while inserting the document. If you didn’t provide then …

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MongoDB Update Operators

parameters MeaningfieldName Field will be updated :{name: ‘Tom’}targetVaule Value will be assigned to the field :{name: ‘Tom’} $set operator to update specified field(s) in document(s) I.Overview A significant difference between …

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Querying for Data (Getting Started)

Basic querying examples Find() retrieve all documents in a collection db.collection.find({}); retrieve documents in a collection using a condition ( similar to WHERE in MYSQL ) db.collection.find({key: value}); example db.users.find({email:"sample@email.com"}); …

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MongoDB CRUD Operation

Create db.people.insert({name: 'Tom', age: 28}); Or db.people.save({name: 'Tom', age: 28}); The difference with save is that if the passed document contains an _id field, if a document already exists with …

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Getting started with MongoDB

Version Release Date3.4 2016-11-293.2 2015-12-083.0 2015-03-032.6 2014-04-082.4 2013-03-192.2 2012-08-292.0 2011-09-121.8 2011-03-161.6 2010-08-311.4 2010-03-251.2 2009-12-10 Execution of a JavaScript file in MongoDB ./mongo localhost:27017/mydb myjsfile.js Explanation: This operation executes the myjsfile.js …

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