• Guru: Easy Date Difference

  January 14, 2019 Ted Holt

  Hey, Ted:

  The dates in our database are stored as seven-digit packed-decimal values in the common CYYMMDD format. In 2018 I wrote an SQL query that reported the number of days between two dates, but it quit calculating properly as soon as it started using 2019 dates. Can you tell me the proper way to find the difference between two dates in days?

  –Becki

  I don’t know if “the” proper way exists or not, Becki, but I can show you how to do the required calculation. SQL has some handy built-in functions that address your problem.

  The DAYS function returns …

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• Guru: Arranging Query Logic in DB2 for i Routines

  January 7, 2019 Michael Sansoterra

  Hey, Mike:

  We use a stored procedure to return the result set to Java and display the results to a screen. I would like to make this stored procedure put the result set into a temporary table and then do some processing on the temporary table. Is this possible and if so how can I achieve this? Thanks.

  Your dilemma is understandable: stored procedure result sets are great when data needs to be returned to a client. However, once generated, the result set cannot be joined, sorted, or stored in a temporary table. Thankfully, a user-defined table function (UDTF) allows …

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• IBM Delivers New Goodies with ACS Update

  December 5, 2018 Alex Woodie

  IBM has issued a new release of Access Client Solutions (ACS), the indispensable Java-based client that delivers a range of functionality to administrators, developers, and users alike. In the new release of ACS, IBM delivers enhancements across a range of functions, including SQL queries, database schemas, data transfer, and printing and emulation.

  IBM first unveiled ACS way back in August 2012 as the strategic replacement for older IBM i client interfaces, such as Access for Windows, Access for Web, and Access for Linux. With a full 5250 emulator, support for printing, the capability to view IFS, spool file, and message …

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• MB Software Gets A Handle On Remote SQL Jobs

  November 28, 2018 Alex Woodie

  System administrators who get frustrated with the inability to see which SQL jobs coming in through ODBC are causing problems on their IBM i server may be interested in a product called Work with Active SQL (WRKACTSQL) from MB Software and Consulting, which recently announced the tool will be free through the end of the year.

  SQL is just about as close to a universal language for business as you can get. While there are other (i.e. “native”) methods of fetching data from Db2 for i, nearly three-quarters of IBM i developers report using SQL, making it the number two …

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• Is Nagios The Future Of Monitoring For IBM i?

  November 12, 2018 Alex Woodie

  For decades, technology professionals turned to established frameworks from IBM Tivoli, CA, Hewlett Packard, and BMC (“The Big Four”) to monitor their hardware and software stacks. But the open source world has caught up with those closed monitoring environments, and a project dubbed Nagios is poised to be the go-to platform for IT monitoring, including on IBM i.

  Nagios, if you are not familiar, is a free and open source software product that provides monitoring and alerting for servers, network gear, applications, and the array of services that organizations increasingly rely on. The software –backed by the obligatory recursive acronym …

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• Modernizing IBM i Apps with Microservices

  November 7, 2018 Alex Woodie

  Application modernization means different things to different people. For some, it could be turning a 5250 screen into a Web or mobile interface, or replacing database access with SQL. But for others in the IBM i community, including the vendor OpenLegacy, modernization refers to exposing existing business logic as APIs through a microservices architecture.

  Microservices refers to a software development technique whereby applications are broken down into multiple self-contained components and served via APIs in a loosely coupled but coordinated manner. The main advantage of this approach is each microservice is built independently of others, which can boost productivity and …

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• Guru: More About Merge

  November 5, 2018 Ted Holt

  I often read back through articles that have appeared in this august publication to look for errors and omissions. Such an expedition recently made me aware that I have not told you as much as I would like to about the SQL MERGE statement. Today I am pleased to provide more information.

  First I want to be sure that everybody understands is that you can add conditions to the WHEN MATCHED and WHEN NOT MATCHED expressions. That means that you do not have to treat all matched or unmatched rows in the same way. Look at this example:

  merge . 

  …

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• Serving Up Fast, Fresche Interfaces for IBM i

  October 31, 2018 Alex Woodie

  “Time is money,” as Benjamin Franklin once said. With enough of either, IBM i shops could accomplish all of their modernization goals. But of course, both time and money are limited, which is why tactical tools like the Presto modernization tool from Fresche are gaining traction.

  Fresche’s Presto is an IBM i modernization tool that takes 5250 output from applications and converts it on the fly into HTML that can be rendered in a standard Web browser. The software can also work with the RPG Open Access handler from IBM to power GUIs that have RPG-based back ends but …

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• Guru: Using SQL With Multi-Membered Files

  October 29, 2018 Mike Larsen

  Recently I worked on a process that required me to update records in a file based on certain criteria. Sounds like a common request, right? Well, there was a twist. The file had multiple members and the update needed to consider all of them. Suddenly, a “simple” request became a bit more challenging.

  I knew of a few ways to work with multi-membered files, but I like to lay out all the options before deciding on a game plan. One method I considered was to perform an override of the file (OVRDBF command). That would certainly work, although I have …

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• PASE Versus ILE: Which Is Best For Open Source?

  October 22, 2018 Alex Woodie

  Open source has emerged as a driver of innovation in the past 20 years, and has greatly accelerated technological innovation. The proprietary IBM i platform has also benefited from this trend, thanks in large part to the capability to run Linux applications in the PASE runtime. But some members of the IBM i community are concerned that the fruits of the open source innovation have not tasted quite as sweet as they do on other platforms.

  Linux was the original breakout star in open source software, and so it should be no surprise that the vast majority of software developed …

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