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Basic Mongo DB

db
Show name of current database
 
mongod
Start database
 
mongo
Connect to database
 
show dbs
Show databases
 
use db
Switch to database 
db
 
show collec­tions
Display current database collec­tions

Create

insert­(data)
insert document(s)
returns write result
 
insertOne (data, options)
insert one document
 
insert­Man­y(data, options)
insert many documents
 
insert­Man­y([­{},­{},{}])
needs square brackets

Read

db.co­­lle­­ct­i­o­n.f­­ind()
Display documents from 
collection
 
find(f­ilter, options)
find all matching documents
 
findOn­e(f­ilter, options)
find first matching document

Update

update­One­(fi­lter, data, options)
Change one document
 
update­Man­y(f­ilter, data, options)
Change many documents
 
replac­eOn­e(f­ilter, data, options)
Replace document entirely

Delete

delete­One­(fi­lter, options)
Delete one document
 
delete­Man­y(f­ilter, options)
Delete many documents
 

Filters

{"ke­y": "­val­ue"}
Used for filter arguments to filter collection
 
{key: {$oper­ator: value} }
Operators for querying data
 
{key: {$exists: true}}
Matches all documents containing subdoc­ument 
key
 
$eq
Matches values that are equal to a specified value.
 
$gt
Matches values that are greater than a specified value.
 
$gte
Matches values that are greater than or equal to a specified value.
 
$in
Matches any of the values specified in an array
 
syntax:
 
{key:{$in: [array of values] } }
 
$lt
Matches values that are less than a specified value.
 
$lte
Matches values that are less than or equal to a specified value.
 
$ne
Matches all values that are not equal to a specified value.
 
$nin
Matches none of the values specified in an array.
 
$and
Performs AND operation
 
syntax:
 
{$and: [ {},{} ] }
 
{key: {$op: filter}, {filter}}
$and operator is necessary when the same field or operator has to be specified in multiple expres­sions
 
find({­doc.su­bdo­c:v­alue})
Filter sub documents

Functions

.count()
Counts how many results
 
.sort(­filter)
Sort ascend:1 descend: -1
 

Metadata

  • Languages:
  • Published: 3rd October, 2019
  • Rated: 4 out of 5 stars based on 2 ratings

Favourited By

CashM boc735 jportugall mxhx

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