mongodb

mongodb ToC

Insertions

db.collection.insert_one(obj)
db.collection.insert_many(arr)

> db.collection.update({key : 'matchcriteria'}, {key : 'newvalue'})

You can delete a specific field with $unset you can add a new key with $set. You can add a new entry to an array with $push and $pushall:

> db.collection.update({}, { $unset : { key : 'alpha'}})

> db.collection.update({}, { $push : { key : { $each : ['alpha', 'bravo']}}})

The function $addtoset has the same behaviour as $push but it only adds the element if it is not there
The function $pop will remove a single element from an array. You can specify 1 to delete the last element or -1 to delete the first one.

> db.collection.update({{}, { $pop : {key : 1}}})

> db.collection.update({{}, { $pull : {key : 'alpha'}})

> db.collection.drop()

> db.dropDatabase()

show collections

> db.collection.insert(document)

> db.collection.find()

> db.collection.find({key : 'value'})

> db.collection.find({}, {key : 0})

> db.collection.find({}, {key : 1})

> db.collection.find({obj.key : 'value'})

> db.collection.find().sort(key: 1)

> db.collection.find().sort(key: -1)

> db.collection.find().limit(10)

> db.collection.find().skip(10)

> db.collection.count()

> db.collection.find({key : { $gt : 10 }})

You can use the in operator to specify an array of possible values to match. Nin es the same but you specify the elements missing.

> db.collection.find({ key : { $in : [10, 15]}})

> db.collection.find({$or : [ {key : 'alpha'}, {key : 'bravo'})