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Essential Skills for System i Web Development, Part II

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In Part I of this two-part series, we looked at essential skills for client-side Web development. In this installment, we'll look at server-side programming.

Server-side programming involves writing business logic, database access logic, validations, and interfaces to the client (usually a browser of some sort, although with Web services applications, it could be another Web server). Server-side programming can be done using a variety of development environments and languages, depending on a number of factors, such as the choice of Web server middleware, hardware, operating system, and development language. For example, on the System i, some of the choices are CGI programs that run in the Apache Web server, PHP running in the Apache Web server with the PHP module installed, Java servlets, or JavaServer Pages (JSPs) running in WebSphere WAS.

Note that CGI is a protocol, not a language or development tool. Several tools use CGI as the basis for delivering Web apps, with varying approaches to implementation of the protocol. These include open-source tools such as CGIDEV2, commercial "kits" (suites of APIs to make programming in the CGI protocol easier), and commercial development environments. Most of these exploit RPG as the primary development/generation language, but it is possible to write CGI-protocol-based code in most any ILE language, such as Cobol, C, or C++. On platforms other than the System i, besides PHP and Java-based solutions, you may encounter CGI scripts, usually written in Perl or early versions of PHP or ASP .NET, Microsoft's equivalent to JavaServer Pages (JSP), running on IIS, Microsoft's proprietary Web server.

Another popular server-side Web technology is Adobe's ColdFusion, originally produced by Allaire. ColdFusion consists of both a development tool and a deployment environment. It uses its own server, which sits on top of other Web servers. ColdFusion had a strong presence in the early days of database-driven Web programming (circa 1999–2000), but its popularity is declining due to the success of PHP, Microsoft's inroads into the marketplace, and the adoption of Java-based solutions.

A Comparison

Let's look at the advantages and disadvantages of some of these approaches.

CGI on System i

Advantages

  • CGI is a widely used protocol (on other platforms besides System i).
  • CGI programs written in native ILE languages run extremely efficiently.
  • CGI is very easy to deploy.
  • CGI programs can be written using familiar languages, such as RPG.
  • Many operating system APIs allow extension of RPG capabilities for rich Web applications.
  • Applications can be tightly integrated with operating system functionality (such as user ID authentication, object-level authority, etc.).
  • Free open-source code libraries are available for writing CGI programs (such as CGIDEV2).
  • Several good commercial development tools are available for writing CGI applications.

Disadvantages

  • CGI is not easily ported to other platforms.
  • CGIDEV2 and other free libraries are limited in functionality.
  • RPG is not a native Web-development language, so it has limited native Web functionality.
  • RPG is proprietary (not used on any other platform than System i), C is not ANSI-standard, and CL is proprietary (these are probably the most common languages used to construct System i–centric Web applications).

PHP

Advantages

  • It's easy to install, configure, and deploy.
  • There are no license fees to run open-source versions.
  • PHP is easy to start coding in (procedurally written or object-oriented).
  • PHP runs efficiently, even though it's interpreted rather than compiled (some pseudo-compilation can be done, also).
  • It's a widely used language, with lots of Web resources available for learning it.
  • Lots of open-source applications written in PHP are available.
  • Many editors are available for writing PHP.
  • PHP has cross-platform capability; if you write PHP using MySQL as your database, for example, it is easy to run it on other servers with no or minimal code changes.

Disadvantages

  • PHP is relatively new on System i.
  • It's interpreted, not compiled. This may mean it doesn't scale as well as compiled ILE code on the System i.
  • Because it's a loosely typed language, it's easy to learn, but that also makes it more prone to buggy code than strongly typed languages such as Java or C++.
  • It's open source, so there's loose control over the quality of the product, with many volunteer contributors, compared to commercial software.

JavaServer Pages (JSP)

Advantages

  • JSP has a well-designed, formal language specification.
  • It offers cross-platform capabilities.
  • Several development tools are available for developing Java-centric Web apps, including the open-source project Eclipse and IBM's WDSc.
  • JSP is similar in concept to PHP and ASP.NET, so it's relatively simple conceptually to work with.

Disadvantages

  • Java does not run well or scale well on System i. Although advocates will tell you otherwise, there are countless stories of companies having to upgrade their hardware to run Web applications in WebSphere.
  • Some developers maintain that WebSphere is difficult to install, configure, and tune.
  • Java often presents a big learning curve for RPG programmers.
  • Java does not fulfill the promise of "write once, run anywhere." It's more like "write once, test everywhere," which reduces the benefit of being able to deploy cross-platform.

If you are interested in learning about J2EE, which is the umbrella technology for Java servlets and JSP (and a lot of other Java-based technologies), Sun Microsystems has a great Web site for that.

ASP.NET

Advantages

  • ASP.NET has a rich set of controls for creating Web applications.
  • The robust development workbench from Microsoft (Visual Studio) helps to create ASP.NET applications.
  • It's a comprehensive language.
  • It's highly scaleable.
  • ASP.NET runs on IIS, Microsoft's popular Web server.
  • It uses the .NET framework, which supports other languages such as VB, C#, and J# (Microsoft's answer to Java). You can compare the .NET framework to ILE on the System i or to the Java Virtual Machine (JVM); each supported .NET language creates compiled code that runs in the .NET framework and can interact with programs built in other .NET languages.
  • It offers a rich set of tools for tight integration with other Microsoft products, such as Outlook for emails, calendaring, etc.

Disadvantages

  • It requires the Microsoft IIS Web server, which runs only on Microsoft operating systems.
  • The .NET framework has a learning curve associated with it.

Because ASP.NET runs on a Microsoft platform, why would you consider it for System i Web development? Well, there are ODBC drivers for connecting to the System i database, so you can write ASP.NET applications that access System i data. Organizations that are nervous about exposing their System i to the Internet sometimes take this approach, although I think this is an unnecessary concern, given System i's robust security features.

What IBM Could Learn from Microsoft

One area that Microsoft really excels in is its development tools. There is really no comparison between IBM's tools and Microsoft's Visual Studio and similar tools. For example, Microsoft's tools are easy to find on the Microsoft Web site, are easy to install, and are not PC resource hogs (compared to WDSc, which requires much more memory). And some developers consider IBM's developer tools to be less intuitive than Microsoft's tools.

http://www.mcpressonline.com/articles/images/2002/Essential%20Skills%20For%20System%20i%20Web%20Development%20II%20V4--08130700.png

Figure 1: Edit an HTML file with Microsoft's Visual Web Developer 2005 Express Edition.  (Click image to enlarge.)

Compared to IBM, Microsoft also does a great job of promoting its tools. For example, on the developer's Web site, you can easily download free Express versions of Microsoft software; just click the Downloads tab. From there, you can download Visual Web Developer 2005 Express in just three clicks—no forms to fill in, no email addresses required. Just click and install. Contrast this with IBM's WDSc page. IBM would do well to make it easier for developers to figure out how to get a free trial download.

In addition, Microsoft does a superb job of selling programming as a fun and exciting pursuit. For example, on that same developer's site, there's a "Facebook developers kit." Microsoft makes its products relevant and interesting to the younger crowd. The site is covered with great images, screenshots, video demos, and more. In contrast, IBM's is... well, dull. No pictures. No videos. Just the IBM logo and lots of text and links.

What These Approaches All Have in Common

All the solutions I've described use a common Web programming concept, to one degree or another. The idea of interleaving HTML with server-side code is quite different from traditional green-screen programming, where you clearly separate UI design (display file DDS) from programming logic (RPG code, for example).

This can present a problem in terms of coding; it makes it difficult to design your screens separately from your programming logic. Each technology addresses this problem with different degrees of sophistication. For example, CGIDEV2 uses "sections," which let you write large chunks of HTML with server-side variables embedded. JSP supports the use of JavaBeans, which are self-contained objects consisting of both presentation layout and server-side code. For example, you can easily hook in an HTML calendar that is created as a bean. The bean draws the calendar on a designated place on the page. The programmer might set properties for the bean that control whether or not the current day is highlighted, for example. Microsoft's ASP.NET supports the same concept. Visual Studio .NET comes with a suite of pre-built server-side controls that you can easily plug in to your pages. One of the most powerful is the datagrid. This is like a subfile on steroids. It produces a scrollable table of values from any SQL select statement, with resizeable and sortable columns, plus many more features. As a programmer, you do not need to know the innards of the control—how the requisite HTML is produced, for example. You simply place the control on your page using Microsoft's design tool and then set properties for it. Zend also has something similar, called Zend Frameworks, which includes an object-oriented library of components written in PHP 5.

Which Approach Should You Choose to Learn Server-Side Technology?

With the advent of strong PHP support on the System i, it really makes sense to start with PHP:

  • It's easy to learn.
  • You can use any editing tool: Zend's, NuSphere, Notepad, TextEdit, HTML-Kit or one of the latest System i–centric rapid development tools from the System i ISV community.
  • You can find tons of code samples on the Web.
  • Zend has done a great job of providing functionality that makes it work with the System i database, using either record-level access or SQL statements.
  • The rich set of functions for writing PHP applications are simply not available in RPG toolsets such as CGIDEV2.
  • It's cross-platform capable.

PHP's Object-Oriented Capabilities

Although PHP is typically coded using procedural coding styles that employ function calls, etc., PHP 5, released in July 2004, also supports a robust object-oriented coding model. Zend Frameworks is a set of object-oriented components written in PHP 5 that provide a high degree of Web functionality that's easy to plug in to your own applications. Having the ability to write PHP in an object-oriented architecture gives you room to grow with the language. You can start out learning to code PHP procedurally, using concepts that are familiar to you, and then eventually move to using an object-oriented methodology to write more robust and reliable code.

Learning PHP

Literally hundreds of Web sites teach PHP. As I mentioned in my previous article, W3 Schools is one of my favorite sites, especially for basic introductions to Web technology. Other sites include PHP.net. A Google search for "PHP tutorials" returned 808,000 hits! Also, there are many good books on PHP. One Web site I have found particularly helpful is O'Reilly's Safari Books Online. This is a subscription-based site that gives you access to O'Reilly's library of publications, as well as technology books from other publishers. You get to read complete online versions of the books. You can also download sections, or buy hardcopy versions directly from the site. Compared to the comparable cost of the print versions, the subscription fees are very inexpensive.

Perhaps one of the major reasons to use PHP is that you can be comfortable knowing that PHP is a major technology that is here to stay. Investing in PHP training for yourself or your staff is a long-term value proposition. It's an investment that you will leverage for years. In addition, PHP is widely taught in colleges and universities, so finding new talent who can code in PHP is relatively easy compared to other languages, especially RPG.

Putting It All Together

You will need the skills from both of the articles in this series in order to write commercial-quality Web applications:

  • HTML for content and layout
  • CSS for advanced layout
  • JavaScript for client-side scripting
  • PHP (or other server-side language) for server-side database access, business rules, and presentation logic

While this sounds daunting, it doesn't have to be. Read a couple of books, grab some sample code, and get going! Web programming is tons of fun, and once you get started on it, you'll never want to see another green-screen again!

Duncan Kenzie is President and CTO of BCD Technical Support, the development and support group for WebSmart, a popular iSeries Web development tool, and Nexus Portal, a portal product specifically designed for System i, iSeries, and AS/400 servers. Duncan has 30 years of experience on the midrange systems platform creating software for both green-screen and native Web environments.

Duncan Kenzie
Duncan Kenzie is President and CTO of ExcelSystems Software Development Inc. Duncan’s company is responsible for product development and technical support for BCD International Inc.’s (www.bcdsoftware.com) product line. Duncan has a BA in English Literature from the University of Waterloo, Ontario, and enjoys writing on a variety of subjects. Duncan is a frequent public speaker and has been writing articles about the midrange platform since 1985. He has also been involved in producing programmer productivity and business intelligence tools for 25 years and is the technical lead on products such as WebSmart, WebSmart PHP, and Nexus, leading System i Web tools.  Duncan still enjoys programming, and studies in leadership and self-improvement. He can be reached at duncan@excelsystems.com.
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    SB_HelpSystems_WC_GenericDuring this webinar, you’ll learn basic tips, helpful tools, and integrated file system commands—including WRKLNK—for managing your IFS directories and Access Client Solutions (ACS). We’ll answer your most pressing IFS questions, including:

    • What is stored inside my IFS directories?
    • How do I monitor the IFS?
    • How do I replicate the IFS or back it up?
    • How do I secure the IFS?

    Understanding what the integrated file system is and how to work with it must be a critical part of your systems management plans for IBM i.

     

  • Expert Tips for IBM i Security: Beyond the Basics

    SB PowerTech WC GenericIn this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

    Don't miss this chance to take your knowledge of IBM i security beyond the basics.

     

     

  • 5 IBM i Security Quick Wins

    SB PowerTech WC GenericIn today’s threat landscape, upper management is laser-focused on cybersecurity. You need to make progress in securing your systems—and make it fast.
    There’s no shortage of actions you could take, but what tactics will actually deliver the results you need? And how can you find a security strategy that fits your budget and time constraints?
    Join top IBM i security expert Robin Tatam as he outlines the five fastest and most impactful changes you can make to strengthen IBM i security this year.
    Your system didn’t become unsecure overnight and you won’t be able to turn it around overnight either. But quick wins are possible with IBM i security, and Robin Tatam will show you how to achieve them.

  • How to Meet the Newest Encryption Requirements on IBM i

    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

  • Node Webinar Series Pt. 1: The World of Node.js on IBM i

    SB Profound WC GenericHave you been wondering about Node.js? Our free Node.js Webinar Series takes you from total beginner to creating a fully-functional IBM i Node.js business application.
    Part 1 will teach you what Node.js is, why it's a great option for IBM i shops, and how to take advantage of the ecosystem surrounding Node.
    In addition to background information, our Director of Product Development Scott Klement will demonstrate applications that take advantage of the Node Package Manager (npm).
    Watch Now.

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.