// (1) Download a docker image that holds a mongodb database$ docker pull mongo// (2) Run a docker container that has the mongo database in it$ docker run -d -p 27017-27019:27017-27019--name mongodb mongo// (3) Connect to the mongo database in the docker container$ docker exec -it mongodb mongo
How to see what the active database is
> db
How to switch to a new (or existing) database
> use natours-test
How to insert a document into a collection in the active database
// db - the active database// tours - the collection (Will be created if it does not exist)// insertOne - the function used to add a single document to the collection// {a: "ape"} - the document to insert into the collection>db.tours.insertOne({ a:"ape" })
How to get a list of all the databases that are available
> show dbs
How to see what collections are available in the active database
> show collections
How to see what documents are in a collection
// db - the active database// tours - the collection// find - get all documents satisfying query (no query means get all)>db.tours.find()
How to create an AND query
// Find all documents in the tours collections WHERE // the a field has the value of 'ape' AND// the age field is less than 15>db.tours.find({ a: {$eq:'ape' }, age: {$lt:15} })>db.tours.find({ $and: [{age:15 }, { a:'ape' } ] })
How to create an OR query
// Find all documents in the tours collections WHERE // the age field has the value of 10 OR 15>db.tours.find({ $or: [{age:10 }, { age:20 } ] })
How to get a projection from your results
// Find all documents in the tours collection// with a field of a whose value is 'ape' and // only return the age field in the results>db.tours.find({ a:'ape' }, {age:1})
How to update a document in a collection
// Find the first document where a='ape' and age=20,// then update age to 15>db.tours.updateOne({ a:'ape', age:20 }, {$set: { age:15 }})
How to replace a document in a collection
// Find a document in the tours collection where a='ape' and age=15// then replace it with a new document where a='ant' and age=2>db.tours.replaceOne({ a:'ape', age:15 }, { a:'ant', age:2 })
How to delete a document from a collection
// Delete one document from the tours collection// that has a field called a with a value of 'ant'>db.tours.deleteOne({ a:'ant' })
