http://vyaskn.tripod.com/hierarchies_in_sql_server_databases.htm
If you want some general discussions on the topic google for
celko and trees or hierarchical or nested sets
HTH
Dick
On Jun 1, 2004, at 11:22 PM, Paul Wilson wrote:
> I'm trying to build a dynamic hierarchical navigation system using thew
> following table structure
>
> ID NAME PARENT_ID
> 1 category1 0
> 2 category1_1 1
> 3 category1_2 1
> 4 category1_1_1 2
> 5 category1_1_2 2
> 6 category2 0
> 7 category3 0
>
> I would like to be able to do some sort of recursive process and put
> this information into a structure to output to a page.
>
> i.e.
>
> category1
> category1.category1_1
> category1.category1_2
> category1.category1_1.category1_1_1
> category1.category1_1.category1_1_2
> category2
> category3
>
> I've got the following code but I'm getting stuck on the recursive
> bit.....
>
> <cfset startpoint = 0>
> <cfset tree = StructNew()>
>
> <cfset getlevel=getchildren(startpoint)>
>
> <cffunction name="getchildren">
> <cfargument name="parentID">
> <cfset var qry_tree="">
>
> <cfquery datasource="#application.dsn#" name="qry_tree">
> SELECT * FROM test
> WHERE Parent_ID = #arguments.parentid#
> </cfquery>
>
> <cfoutput>
> <cfloop query="qry_tree">
>
> <cfset name2="category" & currentrow>
> <cfset tree["category#currentrow#"] =
> qry_tree.name>
>
> </cfloop>
> </cfoutput>
>
> </cffunction>
>
> <cfdump var="#tree#">
>
> Any advice on how to build the hierarchical structure? Would a CFC be
> better?
>
> Thanks in advance.....
>
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