NoSQL Tour-mongodb Shell command summary

MongoDB Tri-voxel. Databases, collections, documents.


A collection is equivalent to a table in a relational database, and the document is equivalent to a row in a table.




Document is an extension of JSON (in the form of Bson)


MongoDB basic additions and deletions change
Insert
Db.tablename.insert ({Bson format});


Find
Db.tablename.find () query all


Db.tablename.find ({bson format}) query by keyword


Update
Db.tablename.update ({},{}) the first parameter is a query condition, the second parameter is the updated value


Remove
Db.person.remove () deletes all records and is irrevocable.
Db.person.remove ({}) is conditionally deleted.
Total number of Db.person.count () records.

NoSQL Tour-mongodb Shell command summary