MongoDB Basic Operations

Mongdodb instance-"Database-" collection-"Document-" field (Key/value pair)

Bin execution./mongod Startup & Background Boot

./mongo into MongoDB shell Many of these commands resemble MySQL show DBS (view database)

Start Error:/data/db/mongod.lock is not empty.

Kill Mongod, delete mongod.lock, this file resembles record MongoDB still start cache file

Create a database

Use namedb Create a database named Namedb and insert the data before you can view it via show DBS

Deleting a database

Use Namedb first enters the database Db.dropdatabase () and then deletes the database (the test database is deleted by default if you do not enter the appropriate database)

Create a collection in the database

Db.createcollection ("CollectionName")

To delete a specified collection in a database

Db.collectionName.drop ()

Inserting a document into the collection

Db.collectionName.insert ({"Namedockey": "Namedocvalue"}) similar to the Save method

Querying collection data

Db.collectionName.find () query. Pretty () query and format display Db.collectionName.find ({"Key": "Value"}); Querying the specified document

Modifying a document

Db.collectionName.update ({"Key": "Value"},{"NewKey": "Value"},{upsert:true}) Upsert=true if not present, Insert Db.collectionName.update ({"Key": "Value"},{$set: {"Oldkey": "NewValue"}}) to modify the specified property

Delete a document

Db.collectionName.remove ({}) deletes all documents in the collection without deleting the collection db.collectionName.list.remove ({"Key": "Value"}) deletes the specified document

This article is from the "Stuffed Pig" blog, please be sure to keep this source http://zuohao1990.blog.51cto.com/6057850/1883265

MongoDB Basic Operations