August 2003
Intermediate to advanced
1140 pages
68h 45m
English
Content preview from Programming ColdFusion MX, 2nd Edition
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Grouping Output
The cfoutput tag has
an attribute called group that lets you to group
output from your record sets before displaying it to the browser.
There are two ways to use the group attribute of
the cfoutput tag. The first method uses
group to remove any duplicate rows from the query
result set.[5] This
is useful in situations where the result set you return from a query
contains duplicate rows of data but you want to display only unique
records.
Example 4-3 demonstrates what happens when you query
a table containing duplicate values and output the results without
using the group attribute of the
cfoutput tag.
Example 4-3. Failing to use the group attribute results in duplicate values in the output
<cfquery name="GetDepartment" datasource="ProgrammingCF">
SELECT Department
FROM EmployeeDirectory
ORDER BY Department
</cfquery>
<html>
<head>
<title>Failing to Use the group Attribute Results in Duplicate Values in the
Output </title>
</head>
<body>
<h2>Departments:</h2>
<cfoutput query="GetDepartment">
#Department#<br>
</cfoutput>
</body>
</html>As you can see in Figure 4-2, executing the template results in many of the same values being output more than once.
Figure 4-2. Duplicate records are displayed because group wasn’t used
This is easy enough to fix. To remove the duplicates from the output,
all you have to do is modify the line of code containing the
cfoutput tag to read ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.