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Basic Mongo DBdb
| 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 |
Createinsert(data)
| insert document(s)
returns write result | insertOne (data, options)
| insert one document | insertMany(data, options)
| insert many documents | insertMany([{},{},{}])
| needs square brackets |
Readdb.collection.find()
| Display documents from collection | find(filter, options)
| find all matching documents | findOne(filter, options)
| find first matching document |
UpdateupdateOne(filter, data, options)
| Change one document | updateMany(filter, data, options)
| Change many documents | replaceOne(filter, data, options)
| Replace document entirely |
DeletedeleteOne(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 |
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