Common MongoDB operation commands

Introduction

The natural compatibility of MongoDB and JavaScript makes using MongoDB under Node.js extremely comfortable. We usually use ORM tools like mongoose to operate MongoDB. However, manually viewing the database is still useful in many scenarios, such as debugging relationships between models, clearing user tables, and resetting the database.

This article lists these commonly used MongoDB commands. MongoDB documentation: https://docs.mongodb.com/ Database Operation

# View database

show dbs

# Switch database

use mydatabase

# Delete the current database

db.dropDatabase()

Collection operations

# View Collection

show collections

# Delete collection

db.users.drop()

Document operations Insert document

db.users.insert({
    name:'harttle',
    url:'http://harttle.com'
})

Query Document

# Query all

db.users.find()

# Conditional query

db.users.find({
    name:'harttle'
})

# Indented output
db.users.find().pretty()

Update documentation

db.users.update({
    name:'harttle'
}, {
    url:'http://harttle.com'    
})

Delete Document

# Delete all

db.users.remove({})

# Conditional deletion

db.users.remove({
    url:'http://harttle.com'
})

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