Home > Articles

  • Print
  • + Share This
This chapter is from the book

Project II: Retrieving Data

Now that your database is set up, it's time to pull some data from those tables. Here are a few basic elements of ColdFusion that you need to know to make this happen. These elements will help you understand how ColdFusion works and give you some "hands-on" experience right now.

<CFSET>

The <CFSET> tag allows you to set a value to a ColdFusion variable. For example:

<CFSET firstName = "Mike">
<CFSET lastName = "Fredrick">

Now that you have set the variables firstName and lastName, you can reference them anywhere in the ColdFusion template and they will hold these values. You will learn other ways you can use this as you are introduced to more functions.

Concatenating variables

You can also easily concatenate variables by assigning a variable to equal the value of two or more variables:

<CFSET firstName = "Mike">
<CFSET lastName = "Fredrick">
<CFSET wholeName="#firstName# #lastName#">

Now the variable wholeName would be: Mike Fredrick

<CFOUTPUT>

<CFOUTPUT

 

QUERY="name of the query"

Optional

GROUP="query column"

Optional

GROUPCASESENSITIVE="yes | no"

Optional

STARTROW="row of query to start from"

Optional

MAXROWS="maximum number of rows to return"

Optional

</CFOUTPUT>

 


The <CFOUTPUT> tag will allow you to output ColdFusion content requests to your browser, such as the variables that were set above.

TABLE 1–4 <CFOUTPUT> Attributes

Attribute

Description

QUERY

The name set in the CFQUERY from which you are querying the database.

GROUP

Defines the column in the query to use when sets of records are grouped.

GROUPCASESENSITIVE

Defines whether to group by case sensitivity. Default value is set to YES.

STARTROW

Defines the row of the recordset from which to start the output.

MAXROWS

Defines the number of rows from the recordset you want returned.


# (The Pound Sign)

Whenever you are going to be displaying a variable to the browser, you must enclose the variable within pound characters. This lets the ColdFusion server know at runtime that this is not just ordinary text but a variable that must be processed before being displayed to the user's browser. Let's set two variables called firstName and lastName and assign them values:

For example:

<CFSET firstName = "Mike">
<CFSET lastName = "Fredrick">

<CFOUTPUT>Welcome back firstName lastName!</CFOUTPUT>

Will output to the screen:

Welcome back firstName lastName!

Not exactly what we were going for. But if you wrap (#) pound signs around the variables firstName and lastName, then ColdFusion will know to process these in a special way, because they are not just ordinary characters.

For example:

<CFSET firstName = "Mike">
<CFSET lastName = "Fredrick">

<CFOUTPUT> Welcome back #firstName# #lastName#!</CFOUTPUT>

Will output to the screen:

Welcome back Mike Fredrick!

Keeping these basics in mind, we can now grab some data from the Customers and Products table from the Shelley Catalog we built earlier in this chapter.

<CFQUERY>

<CFQUERY

 

NAME="name of query"

Required

DATASOURCE="datasource name"

Required*

DBTYPE="database type"

Optional

DBSERVER="database server"

Optional

DBNAME="database name"

Optional

CONNECTSTRING="connection string"

Optional*

USERNAME="username"

Optional

PASSWORD="password"

Optional

MAXROWS="maximum number of rows"

Optional

BLOCKFACTOR="block-size"

Optional

TIMEOUT="time in milliseconds"

Optional

CACHEDAFTER="date"

Optional

CACHEDWITHIN="time-span"

Optional

PROVIDER="COM provider"

Optional

PROVIDERDSN="datasource name"

Optional

DEBUG="Yes | No"

Optional

</CFQUERY>

 


TABLE 1–5 <CFQUERY> Attributes

Attribute

Description

NAME

Defines what you would like to name the query.

DATASOURCE

Defines the name of the data source you set up in your ODBC connection. *Not used when 'DBTYPE=dynamic' or 'DBTYPE=query'.

DBTYPE

Defines the database driver type. By default, ODBC is set, which is fine for most cases. If using other types of connections (such as DB2, Informix, OLEDB, Oracle, or Sybase), use the following accordingly:

  • DB2
  • Informix73
  • OLEDB
  • Oracle73
  • Oracle80
  • Sybase11

Used to specify a connection not defined in the ColdFusion Administrator. When using 'DYNAMIC', you are required to use the 'CONNECTSTRING' attribute to define your ODBC connection information.

DBSERVER

Used with native drivers to specify the database server machine.

DBNAME

SQLOLEDB and Sybase drivers specific; specifies the name of the database.

CONNECTSTRING

Defines additional connection details of a connection specified in the ColdFusion Administrator. This can also be used to override these settings.

*If using DBTYPE-"dynamic", the CONNECTIONSTRING attribute is required.

USERNAME

Defines the username set on the data source.

PASSWORD

Defines the password set on the data source.

MAXROWS

Defines the maximum number of rows to return from the recordset.

BLOCKFACTOR

Used to set a maximum number of records an Oracle or ODBC driver will return from a query.

TIMEOUT

Defines the time in milliseconds to timeout from query.

CACHEDAFTER

Returns cached data from the same query that was executed previously. SQL statement and data source must be the same as the original to retrieve cached data.

CACHEDWITHIN

Retrieves the cached data if the query was run within the parameter supplied here. Use the ColdFusion function CreateTimeSpan to create a valid entry.

PROVIDER

Defines the COM provider and is used for OLE-DB only.

PROVIDERDSN

Defines the name of the COM provider and is used for OLE-DB only.

DEBUG

Used for debugging queries.


The <CFQUERY> tag is the method of communication to the ColdFusion application server, which allows you to retrieve data from a datasource. <CFQUERY> uses SQL to extract the data you are looking for. For example, let's start the application with a statement to retrieve all the customers.

1. <CFQUERY NAME="getCustomers" DATASOURCE="shelleyCatalog">
2. SELECT *
3. FROM Customer
4. </CFQUERY>

How this works:

  1. NAME defines the name used to reference this query statement. DATASOURCE is the name of the datasource you set up in your ODBC connection. In this case, we are using shelleyCatalog.

  2. Using the SQL statement SELECT, you will select ALL the fields using the * wildcard character.

  3. Using the SQL statement FROM, you will SELECT * FROM the Customers table.

  4. Close the <CFQUERY> statement with </CFQUERY>.

Now that you have made your request to the database for the information, you can display it in the browser with <CFOUTPUT>.

The <CFOUTPUT> now has the QUERY attribute attached to it and the name of the query that you specified with <CFQUERY> as the NAME attribute. <CFOUTPUT> will now loop through all the records pulled from the <CFQUERY> and display them. We will throw this into a table to produce a nicely formatted output.

Script 1-1 firstQuery.cfm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>My First QUERY!</TITLE>
</HEAD>
<BODY>

<CFQUERY NAME="getCustomers" DATASOURCE="shelleyCatalog">
SELECT *
FROM Customers
</CFQUERY>

<H2>Customers of Shelley Biotechnologies, Inc.</H2>
<TABLE BORDER="0">
<CFOUTPUT QUERY="getCustomers">
<TR>
<TD>#customerID#</TD>
	<TD>#firstName#</TD>
	<TD>#lastName#</TD>
	<TD>#address#</TD>
	<TD>#city#</TD>
	<TD>#state#</TD>
	<TD>#zip#</TD>
	<TD>#country#</TD>
	<TD>#phone#</TD>
	<TD>#email#</TD>
</TR>
</CFOUTPUT>
</TABLE>
</BODY>
</HTML>

Figure 1-13FIGURE 1–13 Output of all the fields in the Customers table.

  • + Share This
  • 🔖 Save To Your Account

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.

Overview


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information


To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

Newsletters

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information


Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children


This site is not directed to children under the age of 13.

Marketing


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information


If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information


Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents


California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure


Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact


Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice


We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020