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MongoDB Cheat Sheet
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| // I used Datagrip in my crash course, but you can use the mongodb shell and you'll ge tthe same results. | |
| //Friday, 18th June, 2021 | |
| //mongoDB basic commands and queries | |
| //To show all databases | |
| show dbs | |
| //To switch(choose) a database | |
| use sampleDatabase | |
| //Show the colelctions in a database | |
| show collections | |
| //Creating a new database | |
| use newDB | |
| show dbs | |
| //To show which database we are currently in | |
| db | |
| //To create collections | |
| db.createCollection('clients') | |
| //Insert a document | |
| db.clients.insert({ | |
| id:0, | |
| company: "lasosta", | |
| address: " 23 lost st NYC", | |
| overdue_invoices: 24, | |
| products : ['coffee', 'sugar'], | |
| date : Date(), | |
| contacts : { | |
| name: "Jim Neil", | |
| position:"owner", | |
| phone: 5550011, | |
| },}) | |
| //To query the data | |
| db.clients.find() | |
| //To delete a document | |
| db.clients.remove({id:0}) | |
| //to insert multiple documents | |
| db.clients.insertMany ([ | |
| { | |
| id : 0, | |
| company: "lasosta", | |
| address : "23 lost street-NY", | |
| overdue_invoices : 20, | |
| products: ['sugar', 'coffee'], | |
| creation_date : Date(), | |
| }, | |
| { | |
| id : 1, | |
| company: "vanilla factory", | |
| address : "23 great street-CA", | |
| overdue_invoices : 21, | |
| products: ['milk', 'vanilla'], | |
| creation_date : Date(), | |
| },{ | |
| id : 2, | |
| company: "john & sons", | |
| address : "23 found street-TX", | |
| overdue_invoices : 22, | |
| products: ['books', 'magazines'], | |
| creation_date : Date(), | |
| }, | |
| ]) | |
| //choose a document based ona criteria | |
| //similar to | |
| //SELECT * FROM CLIENTS where overdue_invoice = 21 in SQL | |
| db.clients.find({overdue_invoices:21}) | |
| //counting | |
| db.clients.find({overdue_invoices:20}).count() | |
| //sort ( ascending 1 - descending -1 ) | |
| db.clients.find().sort({id:1}) | |
| //Updating - safe way | |
| db.clients.update({id:2}, | |
| { | |
| $set:{ | |
| overdue_invoices: 40, | |
| importer: "James Co. Ltd", | |
| } | |
| }) | |
| db.clients.find() | |
| //Incrementing | |
| db.clients.update({id:1}, {$inc: {overdue_invoices:1}}) | |
| db.clients.find() | |
| //renaming | |
| db.clients.update({id:1}, {$rename: {company: 'legal_name'}}) | |
| db.clients.find() | |
| //update array in id 0 | |
| db.clients.update({id:0}, | |
| { $set : { | |
| products :['sugar', 'coffee'], | |
| } | |
| }) | |
| db.clients.find() |
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