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

Generic SQL Table Export

Generic SQL Table Export

In my last article (CFDJ, Vol. 1, issue 6) I presented Array_Table, a universal browser-based table viewer and query engine. Array_Table allows you to browse, edit and query any Microsoft SQL Server table. It's 100% dynamic so it works with any database.

Many readers and clients loved the new capability and ease it offered. And they wanted more, of course.

Feeling Trapped?
Most data-driven Web sites are located on remote servers. If you use a server-based database like Microsoft SQL Server, it's difficult to retrieve table data locally. Downloading entire tables for use with your desktop software or to keep a local backup seems impossible. In addition, your end users may periodically need to download data from the data-driven sites you create.

Freedom At Last!
We're going to add generic table export capability to Array_Table. It'll allow you to generate a common, popular and generic text file that can be used in almost any desktop application or database. Array_Export will create a text file and optionally e-mail it to you. With this functionality you'll have the freedom to actually get to your data. You can see Array_Table and Array_Export in action at www. arrayone.com/Table/.Do_it! To present your users with a list of available tables, I created Table_List.cfm (see Figure 1).

This form shows you a list of all the tables in a data source with the option to view the data or query the table. I've added a choice, "Export", to the table list. This is the only necessary addition to Table_List.cfm (see Listing 1) and it's simply a hot link to the table export program. Here's the code.... <a href="Export/Export_Menu.cfm?TableName=#Table_List.Name#">Export</a>

All of the export files are being stored and called from a subfolder, "Export". This keeps your files neat and provides one point of reference if you have to modify any export-related code.

When you click on "Export", the Export_menu.cfm script is called and you're presented with the export menu (see Figure 2 and Listing 2).

The table you selected is automatically passed to the export menu. Now you have the option of exporting the data to a comma- or tab-delimited file, with or without field names in the file header.

If you enter your e-mail address, Array_Export will e-mail the exported data file to you.

How'd He Do That?
It's easier than you think. Array_Export.cfm calls Export.Cfm (see Listing 3). Export.Cfm passes the tablename along with your export selections from the menu to the main ColdFusion script, Table_Export.cfm (see Listing 4). This script handles all the export functionality. Let's examine Export.Cfm.

<!--- Export.CFM - Passes logon and user choice parameters to the export engine, Table_Export.CFM. --->
<!--- Set export file name --->
<cfset Dir_Name = #getdirectory
frompath(gettemplatepath())#>
<cfset FileName = "#Dir_Name#\Data\#TableName##DateFormat("#Now()#","mmddyyyy")#.txt">
<!--- Call export engine --->
<cf_Table_Export
DSN="Demo"
Username="Guest"
Password="Guest"
Table="#TableName#"
FileName="#FileName#"
Delimiter="#Form.Delimiter#"
ColumnHeader="#Form.ColumnHeader#"
Email="#Form.Email#">

Export.cfm sets the directory where the exported data file will be stored. Then it sets the name of the exported file to be the file name plus the current date. So if you were exporting a table called "Sales" on December 6, 1999, the exported file name would be "Sales12061999.txt". Export.cfm then calls Table_Export.

cfm and passes all the necessary parameters, such as tablename and filename.

Table_Export.Cfm There are four steps in exporting the table:

1. Query the table to retrieve all of the rows. 3. Write the data out to a text file in delimited text.
4. Mail the exported file to the user.
Step 1. Query the table.

<cfquery name="Export" datasource="Demo" username="Guest" password="Guest">
Select * from #Attributes.Table#
</cfquery>
<cfif Export.RecordCount EQ 0>
There are no records to export
<cfabort>
</cfif>

Simply query the table for all records. If there are none, display a message to the user and abort. If there are, we go to the second step.

Step 2. Get a list of all fields.

<cfquery name="Field_List" datasource="Demo" username="Guest" password="Guest">
SELECT syscolumns.Name
FROM sysobjects , syscolumns
WHERE syscolumns.id = sysobjects.ID
AND upper(sysobjects.Name) = '#Attributes.Table#'
</cfquery>
<!--- Put field list into an array --->
<cfset x = "">
<cfloop query="Field_List">
<cfset x = x & Field_List.Name>
<cfif Field_List.CurrentRow NEQ Field_List.RecordCount>
<cfset x = x & Attributes.Delimiter>
</cfif>
</cfloop>

Here we query the SQL Server system tables (see December 1999 article) to retrieve the list of fieldnames in the table. We need the field list so we can export the data and separate it by fields. The variable x will hold the list of fields, each fieldname separated by a comma.

<Cffile> is the perfect tag for creating and editing text files. Using the action="write" option, ColdFusion will create the text file if it doesn't already exist.

<!--- Create export file --->
<cffile action="WRITE" file="#Attri-butes.FileName#" output=""
addnewline="No">

Once the file is created, you can write the field list header to it (if the user chose to add fieldnames to the file).

<cffile action="APPEND" file="#Attributes.FileName#" output="#x##Chr(13)##Chr(10)#" addnewline="No">

Here, the variable x, which now holds the list of fields, is used.

Step 3. Write the data out to a text file in delimited text.

To make it easier to loop through the list of fields, I prefer to use arrays. The following command converts the fieldlist to an array called FL.

<cfset FL = ListToArray(x, #Attributes. Delimiter#)>

A simple nested (double) loop can now be used to loop through all the records in the table and output all the data. During the loop a single line of data is created in the variable D. It contains all data from all fields as well as the field delimiter character. After the data line is built, it can be written to the text file using <cffile> with the action="append". Append adds new lines to the file without erasing any existing data.

<!--- Loop through the export query which contains all data rows --->
<cfloop query="Export">
<cfset d = "">
<!--- Now loop through the field list and build the row export data --->
<cfloop index="n" from="1" to="#ArrayLen(FL)#">
<cfset S = SetVariable("S", "#FL[n]#")>
<cfset d = d & Trim(#Evaluate(S)#)>
<cfif n NEQ ArrayLen(FL)>
<cfset d = d & Attributes.Delimiter>
</cfif>
</cfloop>
<!--- Write record to text file --->
<cffile action="APPEND" file="#Attributes.FileName#"
input="#d##Chr(13)##Chr(10)#"
addnewline="no">
</cfloop>

Step 4. Mail the exported file to the user.

After the export loop completes the file, a new export file will be sitting on the server. If the user entered an e-mail address on the Export_menu.cfm form, the file will automatically be e-mailed to them. It doesn't get any easier than this.

Extension Cord, Please
Now you have a scalable, dynamic tool to view, query and export data from any table. With the new data export capability it's easy to bring data back to your desktop for backup or manipulation. Since the export generates pure text files, the data can be used in virtually any application. The possibilities are still endless.

More Stories By David Schwartz

David Schwartz is the president of Array Software Inc., a New Jersey-based software company. Array creates global data-driven Internet and intranet Web sites using ColdFusion, Oracle, MS SQL Server and Java. David has been developing turnkey custom database software for 14 years.

Comments (0)

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.


@ThingsExpo Stories
Most people haven’t heard the word, “gamification,” even though they probably, and perhaps unwittingly, participate in it every day. Gamification is “the process of adding games or game-like elements to something (as a task) so as to encourage participation.” Further, gamification is about bringing game mechanics – rules, constructs, processes, and methods – into the real world in an effort to engage people. In his session at @ThingsExpo, Robert Endo, owner and engagement manager of Intrepid D...
Recently, WebRTC has a lot of eyes from market. The use cases of WebRTC are expanding - video chat, online education, online health care etc. Not only for human-to-human communication, but also IoT use cases such as machine to human use cases can be seen recently. One of the typical use-case is remote camera monitoring. With WebRTC, people can have interoperability and flexibility for deploying monitoring service. However, the benefit of WebRTC for IoT is not only its convenience and interopera...
Michael Maximilien, better known as max or Dr. Max, is a computer scientist with IBM. At IBM Research Triangle Park, he was a principal engineer for the worldwide industry point-of-sale standard: JavaPOS. At IBM Research, some highlights include pioneering research on semantic Web services, mashups, and cloud computing, and platform-as-a-service. He joined the IBM Cloud Labs in 2014 and works closely with Pivotal Inc., to help make the Cloud Found the best PaaS.
Everything run by electricity will eventually be connected to the Internet. Get ahead of the Internet of Things revolution. In his session at @ThingsExpo, Akvelon expert and IoT industry leader Sergey Grebnov provided an educational dive into the world of managing your home, workplace and all the devices they contain with the power of machine-based AI and intelligent Bot services for a completely streamlined experience.
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...
Business professionals no longer wonder if they'll migrate to the cloud; it's now a matter of when. The cloud environment has proved to be a major force in transitioning to an agile business model that enables quick decisions and fast implementation that solidify customer relationships. And when the cloud is combined with the power of cognitive computing, it drives innovation and transformation that achieves astounding competitive advantage.
Personalization has long been the holy grail of marketing. Simply stated, communicate the most relevant offer to the right person and you will increase sales. To achieve this, you must understand the individual. Consequently, digital marketers developed many ways to gather and leverage customer information to deliver targeted experiences. In his session at @ThingsExpo, Lou Casal, Founder and Principal Consultant at Practicala, discussed how the Internet of Things (IoT) has accelerated our abilit...
In his session at Cloud Expo, Alan Winters, U.S. Head of Business Development at MobiDev, presented a success story of an entrepreneur who has both suffered through and benefited from offshore development across multiple businesses: The smart choice, or how to select the right offshore development partner Warning signs, or how to minimize chances of making the wrong choice Collaboration, or how to establish the most effective work processes Budget control, or how to maximize project result...
To get the most out of their data, successful companies are not focusing on queries and data lakes, they are actively integrating analytics into their operations with a data-first application development approach. Real-time adjustments to improve revenues, reduce costs, or mitigate risk rely on applications that minimize latency on a variety of data sources. In his session at @BigDataExpo, Jack Norris, Senior Vice President, Data and Applications at MapR Technologies, reviewed best practices to ...
Data is the fuel that drives the machine learning algorithmic engines and ultimately provides the business value. In his session at Cloud Expo, Ed Featherston, a director and senior enterprise architect at Collaborative Consulting, discussed the key considerations around quality, volume, timeliness, and pedigree that must be dealt with in order to properly fuel that engine.
"Akvelon is a software development company and we also provide consultancy services to folks who are looking to scale or accelerate their engineering roadmaps," explained Jeremiah Mothersell, Marketing Manager at Akvelon, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
In his keynote at 19th Cloud Expo, Sheng Liang, co-founder and CEO of Rancher Labs, discussed the technological advances and new business opportunities created by the rapid adoption of containers. With the success of Amazon Web Services (AWS) and various open source technologies used to build private clouds, cloud computing has become an essential component of IT strategy. However, users continue to face challenges in implementing clouds, as older technologies evolve and newer ones like Docker c...
Two weeks ago (November 3-5), I attended the Cloud Expo Silicon Valley as a speaker, where I presented on the security and privacy due diligence requirements for cloud solutions. Cloud security is a topical issue for every CIO, CISO, and technology buyer. Decision-makers are always looking for insights on how to mitigate the security risks of implementing and using cloud solutions. Based on the presentation topics covered at the conference, as well as the general discussions heard between sessio...
To Really Work for Enterprises, MultiCloud Adoption Requires Far Better and Inclusive Cloud Monitoring and Cost Management … But How? Overwhelmingly, even as enterprises have adopted cloud computing and are expanding to multi-cloud computing, IT leaders remain concerned about how to monitor, manage and control costs across hybrid and multi-cloud deployments. It’s clear that traditional IT monitoring and management approaches, designed after all for on-premises data centers, are falling short in ...
Organizations planning enterprise data center consolidation and modernization projects are faced with a challenging, costly reality. Requirements to deploy modern, cloud-native applications simultaneously with traditional client/server applications are almost impossible to achieve with hardware-centric enterprise infrastructure. Compute and network infrastructure are fast moving down a software-defined path, but storage has been a laggard. Until now.
DXWorldEXPO LLC announced today that the upcoming DXWorldEXPO | CloudEXPO New York event will feature 10 companies from Poland to participate at the "Poland Digital Transformation Pavilion" on November 12-13, 2018.
Digital Transformation is much more than a buzzword. The radical shift to digital mechanisms for almost every process is evident across all industries and verticals. This is often especially true in financial services, where the legacy environment is many times unable to keep up with the rapidly shifting demands of the consumer. The constant pressure to provide complete, omnichannel delivery of customer-facing solutions to meet both regulatory and customer demands is putting enormous pressure on...
The best way to leverage your CloudEXPO | DXWorldEXPO presence as a sponsor and exhibitor is to plan your news announcements around our events. The press covering CloudEXPO | DXWorldEXPO will have access to these releases and will amplify your news announcements. More than two dozen Cloud companies either set deals at our shows or have announced their mergers and acquisitions at CloudEXPO. Product announcements during our show provide your company with the most reach through our targeted audienc...
In an era of historic innovation fueled by unprecedented access to data and technology, the low cost and risk of entering new markets has leveled the playing field for business. Today, any ambitious innovator can easily introduce a new application or product that can reinvent business models and transform the client experience. In their Day 2 Keynote at 19th Cloud Expo, Mercer Rowe, IBM Vice President of Strategic Alliances, and Raejeanne Skillern, Intel Vice President of Data Center Group and ...
More and more brands have jumped on the IoT bandwagon. We have an excess of wearables – activity trackers, smartwatches, smart glasses and sneakers, and more that track seemingly endless datapoints. However, most consumers have no idea what “IoT” means. Creating more wearables that track data shouldn't be the aim of brands; delivering meaningful, tangible relevance to their users should be. We're in a period in which the IoT pendulum is still swinging. Initially, it swung toward "smart for smart...