Hi everybody!

I am Daniel and I am developing a Alumini Database right now using MySQL and Ruby On Rails. First of all, I must say this is an amazing forum. I really enjoy reading the posts. I hope you will be able to help me.

I have the following problem in my design. Every alumni will have certain properties, such as Adress, Study, Birthdate, Employers . . . you get the picture. Now the Alumi should be able to select which data are publicly viewable and which only by other alumni.

There is a sulution in place, which I inherited, but I would like to change it. The old solution is to have one large Table where there is an extra binary column for every data column. -> Adress, Adress_Public

Well this is not optimal. Now I thought of having a properties table and a properties_public table in which I could save the memberID and the property that is public.
But I do not really know how to implement without havong to loop over all the findings.

If I would, with the above scheme, select all properties I would get

1, Adress 
1, Birthdate
1, Job

And then I need to loop over this to get the actual information. That is not really effective either.

Do you maybe have an idea?

Thank you very much!

All the best


11 Years
Discussion Span
Last Post by danielgoehl


We lately started adding all the allowed information to be view in 1 field for each user as a concatunated strings seperated by a special char like ";" or "/" then we check parts of it using string functions like mid, IN, find, search or substr depending on language being used the table usually looks like:
1 Name;Address;Phone
2 Name;Phone

I hope this helped.


Hi thank you very much for this tip!

This looks quiet good. As far as I understand, I still need to make two querys to get only the public data as a result. I first would select the public columnames and the build a query with them to receive the actual data.

Isn't there a possibility to put the whole logic of this into the DB so that a SELECT only gives me publicly viewable data?

I am busting my head about this, but I can't find a solution.




What are u using as an interface VB6, .net, access ... ? depending on that I may be able to provide you with the solution.



I am using Ruby On Rails together with MySQL. But I know some VB. Some pseudo code would really help!


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