Welcome!

You will be redirected in 30 seconds or close now.

ColdFusion Authors: Yakov Fain, Jeremy Geelan, Maureen O'Gara, Nancy Y. Nee, Tad Anderson

Related Topics: ColdFusion

ColdFusion: Article

CFDJ Cover Story — Get in the Right Group

The group attribute of the cfquery tag is a powerful tool for not only organizing your data but for styling and presenting it

In a previous article for ColdFusion Developers Journal I described a ColdFusion component (CFC) that I wrote to report on what search terms visitors used on a site's search facility when visiting the Web sites I managed (February 11, 2005 - http://cfdj.sys-con.com/read/48234.htm).

My work is largely comprised of moderate-traffic sites hosted on shared servers and, while most hosting companies offer fairly robust statistical reporting, including well-articulated reports on the referring keyword terms used to enter a site from a search engine, I wanted a report that would show in a simple and easily readable way what terms had been entered in the search facilities (usually Verity-powered) that I had created for use within the site.

One method of the component recorded each search term used when it was used in a data table, and other methods called and displayed a time-sorted count of the most frequently used search terms.

That turned out to be so handy for me and my clients that I crafted another similar CFC that reports on which data records are being called into a detail page so the client and I can see, for instance, what performing arts events are most looked at or e-mailed about.

Since the same collection of records can be called from different calling pages and into different presentations of the details - for instance, one page of event listings can call a detailed page regarding one event, or a detail page itself can call a page to "Email a friend" - this reporting component needed to have a field in its data table for the calling page as well as the record called.

Displaying that information is a classic use of the "group" attribute of ColdFusion's <cfoutput> tag, which specifies the query column to be used when retrieving a record set that's ordered on a query column.

For our calling page CFC, the reporting query looks like this:

<cfquery name="recordcount" datasource="#thedatasource#">
SELECT thecallingscript, thecalledrecordtitle, COUNT(thecalledrecordtitle) AS TheCount
FROM tbl_calledrecords
WHERE thecalledtime BETWEEN #CreateODBCDate(arguments.thestartdate)
# AND #CreateODBCDate(DateAdd('d',1,arguments.theenddate))#
GROUP BY thecallingscript, thecalledrecordtitle
ORDER BY thecallingscript, TheCount DESC, thecalledrecordtitle
</cfquery>

The code for the <cfoutput> tag looks like this:

<cfoutput query="recordcount" group="thecallingscript">
    Here were the records called to the page
    <strong>#thecallingscript#</strong>:<br>
    <table width=600 cellpadding=2 cellspacing=0 border=1>
    <cfoutput>
      <cfif TheCount gte arguments.minRecords>
        <tr>
        <td style="font-size:11px;" valign="top" align="left" width=80>#TheCount#</td>
        <td style="font-size:11px;"" valign="top" align="left">#thecalledrecordtitle#</td>
        </tr>
      </cfif>
    </cfoutput>
    </table><br>
<br>
</cfoutput>

And that results in a display that looks like Table 1.

Note the difference between <cfoutput>'s "group" attribute and "GROUP BY" in the SQL statement. GROUP BY is used with aggregate functions to sort rows into the specified groups before applying an aggregate function to each group.)

What <cfoutput>'s group attribute does is isolate the query column that identifies a group defined by the query's ORDER BY clause, whereupon you can, with an additional <cfoutput> tag nested inside, output the individual rows that have matches to that specified query column. In our example, we output the variable #thecallingscript# and use it as a title for an output of each set of rows creating a match for the different instances of #thecallingscript#.

This use of the "group" attribute can be nested at as many levels as you need. You can have a query that orders rows by several fields, like this:

<cfquery name="thequery" datasource="datasource">
SELECT maincategory, subcategory, subsubcategory, description, theurl
FROM thetable
ORDER BY maincategory, subcategory, subsubcategory, description
</cfquery>

And you can output it by nesting at each group level like Table 1:

<cfoutput query="thequery" group="maincategory">
<ul>
   <li>#maincategory#</li>
   <cfoutput group="subcategory">
   <ul>
     <li>#subcategory#</li>
     <cfoutput group="subsubcategory">
     <ul>
       <li>#subsubcategory#</li>
       <cfoutput>
       <ul>
         <li><a href="theurl">#description#</a></li>
       </ul>
       </cfouput>
     </ul>
     </cfoutput>
   </ul>
   </cfoutput>
   </ul>
</ul>
</cfoutput>

Note that the source query is identified only in the outermost top-level <cfoutput> tag, and that it's not necessary to name the "group" at the innermost level. We'll see in the next example that it's also possible (and very useful) to have more than one <cfoutput> at a given level of the nesting.

What You See Is What You Output, Made to Look the Way You'd Like It To
Because this means of grouping data comes on the output side of the process, the means of styling the display can be made an integral part of the grouping, such as our simple use of unordered list tags in the example above, and is independent of any of the query logic except the ORDER BY clause - complex queries that join two or more tables use aggregate functions. Filters by various parameters are ready for use in the "group" attribute of cfquery.

What's more the various nested levels of grouped output can each have their own display treatment, allowing for some handy integration with CSS or other display code.

A case in point came up recently when one of my clients, a very successful biomedical firm that operates plasma donation centers in a couple of dozen U.S. states, asked for a map application on its Web site that would show its donation centers by state, with detail pages as the site visitor drilled down to specific states and cities.

There are countless examples on this kind of display on various sites around the Web, a large number of which employ HTML <map> and <area> tags to define coordinates of spots on a map that can be linked (Table 2). For users of an application server like ColdFusion, however, this can be made into a dynamic display and the "group" attribute of <cfquery> plays a central role in passing information from the database into CSS that makes the display work.

For the biomedical firm, I started by creating a graphical map of the U.S. and then measured coordinates for the spot on each state where a text abbreviation would sit; these coordinates are stored in a simple table called "tbl_states":

The "tbl_states" table gives me a set of map coordinates to join with my ongoing database of plasma center locations for this query that will get the information needed for the display:

   <cfquery name="getmapinfo" datasource="#thedatasource#">
SELECT distinct c.state, c.city, c.status, c.state_full, s.state_ab, s.state_top, s.state_left
FROM tbl_states s
LEFT OUTER JOIN biocenters c
ON s.state_ab = c.state
ORDER BY state_ab, status, city
   </cfquery>


More Stories By James Edmunds

James Edmunds is a freelance Internet developer and arts administration consultant living in New Iberia, Louisiana. After a career in journalism that included writing for national publications such as Newsweek and serving as editor for an alternative weekly newspaper he founded in southern Louisiana, James began to pursue a second career working with arts groups. Though he had no technology background, his interest in harnessing the power of the Internet to serve the interests of the arts led him into Internet development, an arena in which he has now gone beyond the arts to serve a general business clientele.

Comments (1)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


IoT & Smart Cities Stories
In his general session at 19th Cloud Expo, Manish Dixit, VP of Product and Engineering at Dice, discussed how Dice leverages data insights and tools to help both tech professionals and recruiters better understand how skills relate to each other and which skills are in high demand using interactive visualizations and salary indicator tools to maximize earning potential. Manish Dixit is VP of Product and Engineering at Dice. As the leader of the Product, Engineering and Data Sciences team at D...
Bill Schmarzo, Tech Chair of "Big Data | Analytics" of upcoming CloudEXPO | DXWorldEXPO New York (November 12-13, 2018, New York City) today announced the outline and schedule of the track. "The track has been designed in experience/degree order," said Schmarzo. "So, that folks who attend the entire track can leave the conference with some of the skills necessary to get their work done when they get back to their offices. It actually ties back to some work that I'm doing at the University of San...
When talking IoT we often focus on the devices, the sensors, the hardware itself. The new smart appliances, the new smart or self-driving cars (which are amalgamations of many ‘things'). When we are looking at the world of IoT, we should take a step back, look at the big picture. What value are these devices providing. IoT is not about the devices, its about the data consumed and generated. The devices are tools, mechanisms, conduits. This paper discusses the considerations when dealing with the...
Bill Schmarzo, author of "Big Data: Understanding How Data Powers Big Business" and "Big Data MBA: Driving Business Strategies with Data Science," is responsible for setting the strategy and defining the Big Data service offerings and capabilities for EMC Global Services Big Data Practice. As the CTO for the Big Data Practice, he is responsible for working with organizations to help them identify where and how to start their big data journeys. He's written several white papers, is an avid blogge...
Dynatrace is an application performance management software company with products for the information technology departments and digital business owners of medium and large businesses. Building the Future of Monitoring with Artificial Intelligence. Today we can collect lots and lots of performance data. We build beautiful dashboards and even have fancy query languages to access and transform the data. Still performance data is a secret language only a couple of people understand. The more busine...
Enterprises have taken advantage of IoT to achieve important revenue and cost advantages. What is less apparent is how incumbent enterprises operating at scale have, following success with IoT, built analytic, operations management and software development capabilities - ranging from autonomous vehicles to manageable robotics installations. They have embraced these capabilities as if they were Silicon Valley startups.
Chris Matthieu is the President & CEO of Computes, inc. He brings 30 years of experience in development and launches of disruptive technologies to create new market opportunities as well as enhance enterprise product portfolios with emerging technologies. His most recent venture was Octoblu, a cross-protocol Internet of Things (IoT) mesh network platform, acquired by Citrix. Prior to co-founding Octoblu, Chris was founder of Nodester, an open-source Node.JS PaaS which was acquired by AppFog and ...
The deluge of IoT sensor data collected from connected devices and the powerful AI required to make that data actionable are giving rise to a hybrid ecosystem in which cloud, on-prem and edge processes become interweaved. Attendees will learn how emerging composable infrastructure solutions deliver the adaptive architecture needed to manage this new data reality. Machine learning algorithms can better anticipate data storms and automate resources to support surges, including fully scalable GPU-c...
Cloud-enabled transformation has evolved from cost saving measure to business innovation strategy -- one that combines the cloud with cognitive capabilities to drive market disruption. Learn how you can achieve the insight and agility you need to gain a competitive advantage. Industry-acclaimed CTO and cloud expert, Shankar Kalyana presents. Only the most exceptional IBMers are appointed with the rare distinction of IBM Fellow, the highest technical honor in the company. Shankar has also receive...
The standardization of container runtimes and images has sparked the creation of an almost overwhelming number of new open source projects that build on and otherwise work with these specifications. Of course, there's Kubernetes, which orchestrates and manages collections of containers. It was one of the first and best-known examples of projects that make containers truly useful for production use. However, more recently, the container ecosystem has truly exploded. A service mesh like Istio addr...