This article demonstrates three approaches for storing tree like structures with NoSQL databases on example of the MongoDB.
|
use TreeMongo;
var descendants=[]
var item = db.categoriesNSO.findOne({_id:"Cell_Phones_and_Accessories"});
print ('('+item.left+','+item.right+')')
var children = db.categoriesNSO.find({left:{$gt:item.left}, right:{$lt:item.right}});
while(true === children.hasNext()) {
var child = children.next();
descendants.push(child._id);
}
descendants.join(",")
//Cell_Phones_and_Smartphones,Headsets,Batteries,Cables_And_Adapters,Nokia,Samsung,Apple,HTC,Vyacheslav
|
By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.
If a file you wish to view isn't highlighted, and is a text file (not binary), please
let us know and we'll add colourisation support for it.
Web Developer, interested in bleeding age web technologies and projects.
Experienced and interested in:
- High load web projects, bespoke software development
- DevOps: Chef, Ansible, Vagrant
- NoSQL (mongodb)
- Client stack (javascript core, jquery, AngularJS, HTML5 apis)
- *AAS (Amazon beanstalk, Redhat openshift)
- MEAN & Pure JS stack (Javascript, AngularJS, Node.JS, MongoDB)
->
DevOps inquiries
->
Other inquiries
->
Follow me on Github