Moving from MongoDB to OrientDB

[ismet ozalp]

Hi,

Is there guide for moving from mongodb to orientdb like how should we transform mongodb references to orientdb edges and how should we handle mongodb's objectid's. If anyone has any resource on this matter I would really appropriate sending it to me.  We are very interested on orientdb so we want give it a shot but we have questions about data transformation. Thank you.

Regards,

Ismet

[Luca Garulli]

Hi Ismet,

Take a look at our ETL, in particular to the import from Parse (Facebook) that is using MongoDB under the hood:

http://www.orientechnologies.com/docs/last/Import-from-PARSE.html

Lvc@

--

---
You received this message because you are subscribed to the Google Groups "OrientDB" group.
To unsubscribe from this group and stop receiving emails from it, send an email to orient-databa...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[ismet ozalp]

Thanks Luca,

It's a nice example, I understand the concept and I guess before importing extracted data from Parse i need to import the users first and it's ok.

But what if i have circular (back) references, we have some collections that have documents with circular references, how do we proceed with them?

Regards,

Ismet

[Patrick Hoeffel]

A strategy that I have found useful (if you have a field in your documents that you can use as a Primary Key field, such as "UserId") is to query for the user object you want to link to, and if it exists, create the edge/link. If it does not exists, then just create a "stub" vertex of type "User" with Id = <UserId>. That will give you something to link to. Later, when the actual User object shows up for insert into the database, you can just update the existing node with the rest of the User data, and you won't disturb your already-existing links. If you need to be able to specifically identify these "stub" nodes, you can always add a second property called "Temporary=true" or something like that, so you'll always be able to pick them out later if necessary.

Good luck,

Patrick

[ismet ozalp]

Later tonight i found this which explains my question http://www.orientechnologies.com/docs/last/Import-from-JSON.html 
unresolvedLinkAction is what i am looking for i guess

You received this message because you are subscribed to a topic in the Google Groups "OrientDB" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/orient-database/M_RuZLM_A_k/unsubscribe.
To unsubscribe from this group and all its topics, send an email to orient-databa...@googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

--
With Best Regards
Ismet Ozalp