Coldfusion Looping over query - coldfusion

Question

I have a query result something like
ID IDParent Name Title
--------------------------------------
1 -1 Test1 Test1_Title
2 -1 Test2 Test2_Title
3 -1 Test3 Test3_Title
4 2 SubTest2 SubTest2_Title
5 2 SubTest3 SubTest3_Title
6 2 SubTest4 SubTest4_Title
7 3 SubTest6 SubTest8_Title
8 3 SubTest8 SubTest10_Title
with menu and submenu options.I want to loop over the menu option where IDParent is -1 and after each menu Item where IDParent -1 I would like to loop its child items.
Does coldfusion provides such grouping when looping over queries?
Thanks

Answer 1

CFOUTPUT supports query groupings as well.
<cfquery name="qGetTests" datasource="#DSN#">
SELECT ID, IDParent, Name, Title
FROM Menu
ORDER BY IDParent, Name
</cfquery>
<cfoutput query="qGetTests" group="IDParent">
#IDParent#<br />
<cfoutput>
#ID# #Name# #Title#<br />
</cfoutput>
</cfoutput>

Answer 2

That's pretty easy with Query of Queries (QoQ) and a little recursion:
<!-- database query, sorted in the way you want to display the results -->
<cfquery name="Menu" datasource="#YourDSN#">
SELECT ID, IDParent, Name, Title
FROM Menu
ORDER BY Name
</cfquery>
<!-- output menu -->
<cfset OutputQueryRecursive(Menu, -1)>
<!-- support function -->
<cffunction name="OutputQueryRecursive">
<cfargument name="BaseQuery" type="query" required="yes">
<cfargument name="ParentId" type="numeric" required="yes">
<cfquery name="CurrLevel" dbtype="query">
SELECT * FROM BaseQuery WHERE IDParent = #ParentId#
</cfquery>
<cfif CurrLevel.RecordCount gt 0>
<ul>
<cfoutput query="CurrLevel">
<li id="menu_#ID#">
<span title="#HTMLEditFormat(Title)#">#HTMLEditFormat(Name)#</span>
<cfset OutputQueryRecursive(BaseQuery, ID)>
</li>
</cfouptut>
</ul>
</cfif>
</cffunction>

Answer 3

If you have any control of the SQL generating that query result, you could consider getting the DB to get you the data back in the right format in the first place. Approaches for Oracle and SQL server are covered here and there's some options for mySQL here
If your menu data is always going to be small, then there'll be no problem with Tomalak's solution, but if you're ever going to have large numbers of menu items then I'd test that it still performs ok.

Answer 4

consider qTestQuery contains the values
<cfset qTestQuery1 = qTestQuery>
<cfloop query="qTestQuery">
<cfif qTestQuery.IDParent eq -1>
<span class="main-menu">#qTestQuery.name#</span>
</cfif>
<cfset local.parentId = qTestQuery.IDParent>
<cfloop query="qTestQuery1">
<cfif qTestQuery1.IDParent eq local.parentId>
<span class="sub-menu">#qTestQuery1.name#</span>
</cfif>
</cfloop>
</cfloop>