We currently use gremlin.net library in a net core 3.0 application to connect to Azure Cosmos db. We would like to connect to neo4j.
Can we use same gremlin.net library for neo4j? Assuming gremlin
server is installed.
Will Neo4j.Driver library support gremlin
queries? What exact library to use?
Any code sample to connect and
create a node in neo4j using gremlin library for a .net core 3.0
application?
Is neo4j really a better graph model than Azure cosmos?
Can we use same gremlin.net library for neo4j? Assuming gremlin server is installed.
Yes, assuming you mean Gremlin.Net and yes, Gremlin Server should be installed hosting neo4j.
Will Neo4j.Driver library support gremlin queries? What exact library to use?
I don't think that's possible. Neo4j drivers will support Cypher based queries, not Gremlin.
Any code sample to connect and create a node in neo4j using gremlin library for a .net core 3.0 application?
The beauty of Gremlin is that the code examples for one graph database are the same for any other and for the most part, Gremlin in Java is the same as Gremlin in .NET or any other programming language (aside from changes that make Gremlin more ergonomic to the programming language itself). So, if you want to create a node then it's always going to be:
using static Gremlin.Net.Process.Traversal.AnonymousTraversalSource;
var g = Traversal().WithRemote(
new DriverRemoteConnection(new GremlinClient(new GremlinServer("localhost", 8182))));
g.AddV("person").Property("name","Bob").Iterate();
Is neo4j really a better graph model than Azure cosmos?
My personal opinion is that you try them both and determine which is better for yourself given you requirements. That is the choice that Apache TinkerPop and Gremlin help to give you in that you can try lots and lots of different graph systems out there to find the one best suited to your needs.
I am trying to improve neo4j reading capabilities by not going through the REST API. It looks like I could improve performances by using websockets. It looks like this article is working on improving performance in embeded databases.
Is a similar endpoint available in the server version (can't find anything on it) ?
I may not have access to the neo4j server per say --> why I need it out of the box or as an extension.
I did some experiments with using websockets & cypher which was pretty straightforward: https://github.com/jexp/cypher_websocket_endpoint
And for instance http://structr.org supports Websockets on top of Neo4j out of the box.
I am working on scientific project and i am currently studying the possibility to use graph databases.
The software architecture that we developed is service oriented with android clients.
I want to know if Neo4j can be used in my case and the most important if i can execute Cypher requests from Android.
Cheers
As #MarcoCI mentioned you can emit Cypher queries via REST. Neo4j therefore has the transactional Cypher endpoint and the legacy Cypher endpoint.
Another idea would be to encapsulate your actions on a use-case level within unmanaged extensions and let your Android client trigger those. Unmanaged extensions are basically java code deployed to the Neo4j server that expose new REST endpoints. Within its implementation you might use Cypher or core API.
I'm toying around with Delphi. Most of my desktop development is done in .Net, and embedded systems with C. I've done some web development in RoR & Python (Django, CherryPy) I am interested in taking a crack at a project that would be a web service (REST or SOAP) with a native client and a web client.
Because I've recently been re-inspired to learn Delphi, I'm curious what the options are to build the web service and web client with Delphi. Most of the Delphi documentation is a little dated but so far I've found these choices:
DataSnap
WebSnap
WebBroker
IntraWeb
Data Abstract and RemObjects SDK from RemObjects
I get the impression that WebSnap is dead, but the other technologies are still being developed. Is there any guidance about which technology to investigate?
p.s. I realize that Delphi isn't a wildly popular choice for web development, but I'm curious to try since I've been having fun learning the VCL.
You could perhaps add our Synopse SQLite3 Framework to your list.
There is some interresting features:
ORM approach to manage your data (i.e. define and access your data as regular Delphi classes), on both Server and Client Side - similar to ActiveRecord in RoR ;) ;
Multi-tier architectured;
no database or dll to deploy (uses embedded SQLite, without any external dll) - you can even not use SQLite, but a simple and fast in-memory database written in pure Delphi (I've begun a fork of Zeos, to be database independent);
Very optimized HTTP/1.1 multi-threaded Server (but you can communicate via other protocols, or even purely locally within the same process, without any Client/Server);
Data transmission uses standard JSON, so you can receive the same data in either a Delphi client, either an AJAX client;
Client/Server is RESTful and written in very optimized Delphi code (some part were even written in asm after profiling, for speed and low memory use);
Can also be used to define DataSnap-like Client-Server JSON RESTful Services, if the RESTful approach is not enough for you;
Full Open Source, compiles and work from Delphi 6 up to XE (with full Unicode support for all versions, because it's based on UTF-8 from the engine core).
Web Service Toolkit is a web services package for FPC, Lazarus and Delphi; “Web Service Toolkit” is meant to ease web services consumption and creation by FPC, Lazarus and Delphi users. Better check out from svn as the 0.5 release is actualy outdated.
RESTful server side method calls hosted as an ISAPI dll or just use the Indy HTTP Server component. It's really a quite simple and powerful approach and lets you get started quickly without a big learning curve.
DelphiMVCFramework is a powerful RESTful framework used also for website development
https://github.com/danieleteti/delphimvcframework
DMVCFramework features
RESTful (RMM Level 3) compliant
Fancy URL with parameter mappings
Server side generated pages using Mustache templates
Messaging extension using STOMP and Apache ActiveMQ or Apache Apollo (beta)
Can be used in load balanced environment using Redis or MySQL as state server
Integrated RESTClient
Works with DelphiXE3 or better
Integrated Logging System
It is really simple to use. You can be productive in minutes!
Here's the DMVCFramework Developers Guide
https://danieleteti.gitbooks.io/delphimvcframework/content/
If you need support, there is the official facebook group with more than 600 users https://www.facebook.com/groups/delphimvcframework/
I'm the main developer but there are more than 6 active contributors.
WebHub is another well established, though lesser known third party Delphi web framework.
Couple other choices that can be used to build a webservices server, somewhat simlar to datasnap or remobjects/dataabstract, are below. I did some work years ago with kbmMW and it's a solid library. I think both kbmMW and RealThinCLient have free and/or open source versions:
RealThinClient
kbmMW
We have a web front end for our Delphi server app written in Delphi Prism/ASP.NET. It works great and allows us to leverage our Delphi language skills in a .NET environment.
This one is very old,but a lot of things have changed,I myself had left Intraweb and gone to UNIGUI,since its based on EXTJS and produces single page applications.
Well Its been two years since I left my last message on this posts,
although uniGUI is still the only solution already made for creating SPA in Delphi,it seems that IW17 will be a real cutting edge,an waters divisor in the history of Delphi.Client side rendering without needing server communication,Wordpress integration,no need to write a single line in javascript like other frameworks,websockets,fibers,our "Delphi React".
Are there any important features in Rails or Django which do not exist in the other framework?
Is there anything important missing - for an enterprise web app - in either one?
This question is not intended to be argumentative - I am trying to make an informed technology decison for an upcoming project. Two of the concerns I have, with regard to choosing one of these frameworks, are:
Integration with external systems (Java, .Net, SAP, etc)
Reporting - would there be any difficulties producing sophisticated reports/charts (financial) using either framework. This would require multi-table joins, custom sorting, pagination (w/ajax) and printing for different devices.
Django on Jython is running nicely so Java integration shouldn't be a problem.
In terms of integration in general don't forget that Django is also Python so you have the massive support of the standard library plus all the other mature well supported Python projects out there. Integrating 3rd party Python code into Django projects is usually trivial.
At the risk of getting evangelical I would list the following Django killer features:
The admin
The documentation
Python ;-)
Django also has GeoDjango. The NY Times chose Django over Ruby for their Represent project for easy mapping support:
"We built Represent with Django, the Python web framework. Although we do most of our work with Ruby on Rails, we chose Django for this project so we could use GeoDjango, an add-on that supports geometry fields and extends the ORM to allow spatial queries."
My experience/opinion is that Rails is much more flexible and has a more diverse ecosystem and is developing faster while Django is more stable, slower changing, better documented.
Rails has a huge advantage for integration with other systems via JRuby. You can give rails access to the entire Java ecosystem and run it on the JVM.
Django might be able to take advantage of .Net via IronPython (I don't know anything about this other than that IronPython exists - while IronRuby is only on the way but not here yet)