ColdFusion
| ColdFusion: With ColdFusion, you can build and deploy powerful web applications and services with far less training time and fewer lines of code than ASP, PHP, and JSP. Version 7.0 introduces powerful new application services including rich Flash forms generation, structured reports, and dynamic generation of printable documents. Coupled with version 6.1’s simplified installation and migration, updated key features, and increased in runtime performance, these features open up a new world of applications beyond the browser. | |
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ColdFusion is a program based on the CFMX programming language that builds and deploys powerful web applications and services. With proven tag-based methodology, ColdFusion’s features allow web developers to easily harness the power of the Java Platform to deliver powerful Internet applications to millions of people worldwide. ColdFusion is a server side language, which is executed by a ColdFusion application server. It works by executing CFM templates (which is a mixture of HTML and ColdFusion instructions) to return normal HTML to the requesting browser. The ColdFusion MX Enterprise software suite provides all the necessary software to create large-scale websites, applications, and hosting environments, and is available for either a stand-alone installation for web developers or for industry-level deployment on J2EE application servers.
- The true power of ColdFusion Markup Language (CFML)
The core functionality of ColdFusion Markup Language (CFML) is centered on the use of tags. These server scripting tags give ColdFusion its speedy development applications for the web. CFML is quite simple to learn, but is powerful enough to handle even the most complex and demanding web applications. Processed entirely on the server, CFML uses syntax closely resembling that of HTML and XML. CFML consists of two primary language elements: tags and functions. Tags let you perform operations such as accessing a database. Functions can return data and do other operations like retrieving the system date. Tags, functions and operators make up expressions. Building expressions in ColdFusion is easy and can include simple as well as complex elements. The ways in which these expressions and elements are used determine how ColdFusion processes your program.
- Is ColdFusion easy to learn?
Out of the many different methods used to develop and build web applications, pages, and services, ColdFusion is by far the easiest to learn and use. For ColdFusion 7.0, Macromedia has created a helpful ‘Getting Started Experience’ interface that gives the new user access to tutorials, whitepapers, topic index, and even two sample applications to play with. There is no other language or product as well suited to web developers as ColdFusion. Easy-to-use visual tools and an intuitive server scripting environment allow new users to easily pick up the CFML language.
- Windows, UNIX, or Linux…which Should I Use To Run My Website?
Macromedia ColdFusion MX supports most operating systems including Windows, Unix, Linux, IBM AIX and HP-UX. Below is a list of operating system versions and system requirements for the latest ColdFusion version:
Windows OS
Intel Pentium processor or higher
256 MB RAM but 512 MB is highly recommended
400 MB of hard disk space available
Works on MS Windows 98 / ME / NT 4 / SP6A / 2000 /SP3 / XP/ 2003
Linux OS
Intel Pentium processor or higher
256 MB RAM but 512 MB is highly recommended
400 MB of hard disk space available
Red Hat Linux 7.2 / 7.3 / 8.0 / 9 / AS & ES 2.1 / AS & ES 3.0
SuSE Linux 7.2 / 7.3 / or 8X
Turbo Linux 8 Server ( Japanese Only)
Unix
SPARC, PA-RISC 1.1 / 2.0 / Power 3 processor
Sun Solaris 7 / 8 / 9
256 MB RAM but 512 MB is highly recommended
400 MB of hard disk space available
HP-UX 11i
IBM AIX 5L 4.3 / 3 / 5.1 / 5.2
Apple Mac OS X
- What Databases and Web Servers are supported with ColdFusion?
ColdFusion MX supports most major databases including Microsoft SQL, Microsoft SQL Server, Oracle, IBM DB2, Sybase and IBM Informix. In addition, CFMX can run on most major web servers including IIS, Apache and Sun One.
- What are the differences between the ColdFusion 7.0 editions?
Standard Edition: This edition is for single web application or small workgroup environments. It builds accessible, high-quality rich forms, transforms existing HTML content into PDF or FlashPaper 2 formats, creates structured business reports for workgroup applications, delivers charts and graphs, and increases text searching capabilities. Enterprise Edition: This edition is ideal for the quickly growing business. It includes all the features of the Standard Edition as well as scalability, performance, and enterprise management capabilities for larger web and business applications. The Enterprise Edition has multi-instance deployment and management, clustering, high-speed enterprise database drivers, server security J2EE packaging and deployment, and high-performance e-mail delivery. Yet the most anticipated feature of this edition is the event gateway, which enables ColdFusion applications to connect to mobile phones and instant messaging.
- How does ColdFusion run on application servers?
The ColdFusion MX runtime environment is actually a Java application that takes advantage of the many powerful services in the J2EE platform. What this J2EE platform does is connects the various databases, manages its own security, as well as processes the requests sent in by the application itself. When ColdFusion MX is installed in the J2EE configuration, the compiled infrastructure will be on top of the application server in order to execute the language’s applications. This configuration will allow developers to cultivate and set out pages, as well as manage the MX server settings using the ColdFusion Administrator.
- What are the advantages & disadvantages of using custom tags in ColdFusion?
Using custom tags within ColdFusion has its advantages and disadvantages. Custom tags written in CFML primarily try to achieve a simple balance between three aspects; taking argument statements, having body tags begin and end with the appropriate tag, and ensuring proper processing when a beginning tag is encountered by the ColdFusion program. If designed properly, these custom tags will also be able to be called recursively (meaning that it will have the functionality to call itself within the body tag). Although a custom tag in ColdFusion will call a page included the CFinclude tag, the disadvantage is that the code must be recursive, have developed complex functionality, and must be convenient for others (although often times code is not convenient). If creating either a User Defined Function (UDF) or a custom CFML tag, weigh the options carefully, since invoking a UDF requires less system overhead than using a custom tag.
- What are the new features for ColdFusion 7.0?
ColdFusion 7.0 brings a whole new level of features to developers. With better web application creation, new server management and deployment options, and a new class of applications, users are able to quickly create powerful Internet applications without spending a lot of time or money. Macromedia developed the new features to help web developers be more efficient in performing routine tasks such as structured business reporting, Flash-rich forms, and PDF and FlashPaper 2 document generation. ColdFusion Report Builder, a tool that helps users develop detailed business reports, will create sub reports, charts and graphs, automatically generate subtotals, and much more. ColdFusion 7.0 simplifies the form building process with the new Rich Flash and XML Forms capabilities. The new CFDOCUMENT feature eliminates chopping page printing with a single tag that transforms web pages into PDF or FlashPaper 2 formats.
- How do I purchase my own copy of ColdFusion?
The ColdFusion MX suite is available directly from Macromedia, local computer software resellers, licensing programs and some web hosts. | | |
| What is DNS propagation and why does it take so long?
You’ve registered your domain name, and paid for hosting with a hosting provider, and uploaded your website to the web server. If this is all done, why can’t you see the results of your hard work right away? What is this DNS propagation people keep telling you about? In order to understand DNS propagation, you must first understand a little about how DNS works. When you set up your website with your hosting provider, they create a Master DNS record in their Domain Name Servers. Your domain registrar (the company you paid for the honor of owning your domain name) points to your web host’s DNS server as being the master authority of your domain. When any outside source wants to know how to find your website, they first go to the registration database to find out who the DNS authority is for your website. Then they visit your hosting provider’s DNS servers to find out what the IP Address is for your domain name, and from there your audience can now view your website. The problem with this whole scheme is that in order to speed up the rate at which their customers can view the internet, each Internet Server Provider caches their DNS records. This means that they make their own copy of the master records, and read from them locally instead of looking them up on the Internet each time someone wants view a website. This actually speeds up web surfing quite a bit, by (1) speeding up the return time it takes for a web browser to request a domain lookup and get an answer, and (2) actually reducing the amount of traffic on the web therefore giving it the ability to work faster. The downside to this caching scenario and what makes it take so long for your website to be visible to everyone, is that each company or ISP that caches DNS records only updates them every few days. This is not any kind of standard, and they can set this time anywhere from a few hours to several days. The slow updating of the servers cache is called propagation, since your websites DNS information is now being propagated across all DNS servers on the web. When this is finally complete, everyone can now visit your new website. Being that the cache time is different for all servers, as mentioned above, it can take anywhere from 36 to 72 hours for DNS changes to be totally in effect. |
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Coldfusion 