Adobe ColdFusion 8

About record sets

Query of Queries is based on manipulating the record set, which you can create using the cfquery tag and other ways.

When you execute a database query, ColdFusion retrieves the data in a record set. In addition to presenting record set data to the user, you can manipulate this record set to improve your application's performance.

Because a record set contains rows (records) and columns (fields), you can think of it as a virtual database table, or as a spreadsheet. For example, the cfpop tag retrieves a record set in which each row is a message and each column is a message component, such as To, From, and Subject.

Creating a record set

You can perform a Query of Queries on any ColdFusion tag or function that generates a record set, including the following:

Creating a record set with the QueryNew() function

In addition to creating a record set by using a cfquery or other CFML tags, you can create it with the QueryNew() function.

  1. Create a ColdFusion page with the following content:
    <html>
    <head>
    <title>The queryNew function</title>
    </head>
    <body>
    <h2>QueryNew Example</h2>
    
    <!--- Create a query, specify data types for each column. --->
    <cfset qInstruments = queryNew("name, instrument, years_playing", 
        "CF_SQL_VARCHAR, CF_SQL_VARCHAR, CF_SQL_INTEGER")>
    
    <!--- Add rows. --->
    <cfset newrow = queryaddrow(qInstruments, 3)>
    
    <!--- Set values in cells. --->
    <cfset temp = querysetcell(qInstruments, "name", "Thor", 1)>
    <cfset temp = querysetcell(qInstruments, "instrument", "hammer", 1)>
    <cfset temp = querysetcell(qInstruments, "years_playing", "1000", 1)>
    
    <cfset temp = querysetcell(qInstruments, "name", "Bjorn", 2)>
    <cfset temp = querysetcell(qInstruments, "instrument", "sitar", 2)>
    <cfset temp = querysetcell(qInstruments, "years_playing", "24", 2)>
    
    <cfset temp = querysetcell(qInstruments, "name", "Raoul", 3)>
    <cfset temp = querysetcell(qInstruments, "instrument", "flute", 3)>
    <cfset temp = querysetcell(qInstruments, "years_playing", "12", 3)>
    
    <!--- Output the query. --->
    <cfoutput query="qInstruments">
        <pre>#name#    #instrument# #years_playing#</pre>
    </cfoutput>    
    
    <h3>Individual record retrieval:</h3>
    <cfoutput>
    <p>#qInstruments.name[2]# has played #qInstruments.instrument[2]# for
        #qInstruments.years_playing[2]# years.</p>
    </cfoutput>
    
    </body>
    </html>
    

  2. Save the page as queryNew.cfm in the myapps directory under the web_root directory.
  3. Display queryNew.cfm in your browser