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Does Radicore allow orphaned children? [message #3374]

Thu, 24 January 2013 17:56

David Lee
Messages: 44
Registered: June 2006

Member

I require two tables, each with records that are related to zero or one records in the other table. My initial thought was a simple parent-child relationship, and use nullify on delete, allowing nulls in the foreign key and orphaned children. This does not work, and I suspect the way to do this is via a link table. I have also not found any Radicore relationships which use nullify on delete. So I have 2 questions:

1) Is the nullify on delete option usable in any situation? Any examples available?
2) Is there any simpler option than a link table for my requirement?

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Re: Does Radicore allow orphaned children? [message #3375 is a reply to message #3374]

Fri, 25 January 2013 02:05

AJM
Messages: 2373
Registered: April 2006
Location: Surrey, UK

Senior Member

Take a look at Update Relationship and you will see that there is a NULLIFY option for relationships.

When you say that putting nulls in a foreign key does not work, what exactly do you mean? This is used in my Xample prototype to produce orphan nodes in my tree structure, so I know that the concept does work.

Tony Marston
http://www.tonymarston.net
http://www.radicore.org

[Updated on: Fri, 28 March 2014 05:12]

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Re: Does Radicore allow orphaned children? [message #3378 is a reply to message #3375]

Fri, 25 January 2013 13:10

David Lee
Messages: 44
Registered: June 2006

Member

Thanks for the quick response. I am aware of the option on Update Relationship, but could not find any example where it was used. I will check again your Xample prototype, and see what I can get to work (or not work), and post the result. It is likely to be a week before I can look at this.

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