MongoDB Common operations

MongoDB is also a database, like MySQL, there are servers, databases, tables, records concepts. You can also use command operations in the terminal.

1. Connect MongoDB

MONGO 127.0.0.1:27017

2. Show all databases

Show DBS;

3. Using the Database

Use test;

4, view the database under the collection (table)

Show collections;

5. Manipulating a Collection

Db.person.find ();

6. View the database for the current operation

Db.getname ();

MongoDB execution JavaScript

MongoDB supports running JavaScript, which is basically the same as General JavaScript.

There are several ways to allow this:
1. Directly run the client in MongoDB connection. For example, edit and run JS in Robo 3T

2. MONGO--eval Run a script

Without entering interactive mode, run a MongoDB script directly under the command line of the OS.

Mongo127.0.0.1:27017/test--eval "Printjson (Db.users.findOne ())"

3, under the OS command line, run a JS file

MONGO 127.0.0.1:27017/testuserfindone.js

Content of Userfindone.js:

Printjson (Db.users.findOne ());

4, in MONGO Shell interactive mode, run a JS file

MONGO Test

Load ("/root/mongojs/userfindone.js")

MongoDB Common operations