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MongoDB Basic - CLImongod
| Start the Database | mongo
| Start the mongo command line | show dbs
| Show the databases | use db
| Use the database named db | show collections
| Display the current database collections |
Finds - db.collectiondb.collection.find()
| Displays documents from collection (first 10) | it
| Iterate the last command | .find( query [,fields] )
| Find one document by conditions | .find().limit(n:number)
| Find n documents | .find().pretty()
| Format results in Mongo Shell | .find().sort(key:1|-1)
| Sort by key in ascending (1) or descending (-1) order | .find().skip(5)
| Skip 5 documents (similar to offset) |
Modify - db.collection.insert(document(s) [,options])
| Insert a new document or multiple documents(if provided an array of documents) in the collection. Options: writeConcern, ordered | .insertOne(document, [,options])
| .insertMany(array of documents, [,options])
| .update(query, update [,options])
| Update the documents matched by the query. Options: upsert(insert if no match), multi(aply to multiple elements), writeConcern | .remove(query [,options])
| Remove some documents from a collection. {} for all. options: { justOne, writeConcern } | .deleteOne(query)
| Same as above | deleteMany(query)
| Same as above |
| | Mongoengine - Pythonfrom mongoengine import *
| connect('tumblelog')
| Connect to a database | class MyDocument(Document)
| Define a Document | class MyDocument(EmbeddedDocument)
| Define a Document | obj = MyDocument(field=value)
| Instantiate a Document | obj.save()
| Save the new Document | --------------------------- Fields --------------------------- | StringField
| ListField(type)
| ReferenceField(document)
| FloatField
| EmbeddedDocumentField(document_class)
| | --------------- Field Args --------------- | required=True
| Optional Argument | max_length=120
| Optional Argument | primary_key=True
| Optional Argument | meta = {'allow_inheritance': True}
| reverse_delete_rule=CASCADE
| --------------------------- Querying --------------------------- | MyDocument.objects
| List of documents | MyDocument.objects(key=value)
| List of Documents with query | MyDocument.objects.count()
| Count Documents | MyDocument.objects(key__op=value)
| Query key with operator __op | |
|
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