As400 rpgle

As400 rpgle

Prior to this support, numeric fields were often used to represent date and time data. Custom written programs then had to be developed to manipulate, validate, and interpret dates.

With date and time fields comes a whole host of added support to validate, format, compare, and manipulate dates and times. Timestamp fields, which include both date and time including micro-secondsmay also be defined. Date and time fields may be defined in a number of different formats. The format determines how date and time field is displayed and printed. The available date formats are note the separator characters :.

The last 6-positions of the timestamp field are microseconds timestamp fields are often used to generate unique keys for a file. Therefore, if we need to allow a user to enter a date or time, we must first define a numeric or character field, test the field for a valid value, and then move that value to a date or time field. Date fields are stored internally in memory as an integer representing a number of days from a given base date.

Sometimes this format is referred to as super-julian. When ever the date is to be displayed, printed, written to a file, etc, an algorithm is run to convert the date from an integer to the specified format. This is the same way date fields are stored in most PC applications as well. To illustrate this, open a workbook in Microsoft Excel.

as400 rpgle

It will be interpreted and displayed as a date. Now, change the format of the cell to General. The value displayed now will bewhich is the number of days from January 1, — the base date used in Excel. Change the number to 2, and re-format the cell as a date make sure to include year.

The date now displayed will be January 2, Time and timestamp fields are stored in a similar slightly more complex manner. These dates have a valid range of January 1, through December 31, Moving a field with a 4-digit year outside of this range to these fields will cause a runtime exception. If there is any possibility that an application will use dates outside of this range two-digit year date formats should not be used.

If you try to move an invalid date to a date field you will immediatly get an error. This is an important consideration. For example, a program may assign a value of to a Date-Processed field to indicate the records has not been processed yet.

%ABS Built-In Functions in rpgle

If you attempt to move these values to a date field, you will get a run-time exception. Therefore, if there is any question about the validity of a date or time, you should use the TEST opcode.

TEST will check for a valid date, time, or timestamp format in a numeric or character field. An opcode extender of D dateT timeor Z timestamp is used to indicate the type of data being tested for. An error indicator will be turned on if the data is invalid.Login or Sign Up. This topic is closed.

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Posts Latest Activity. Page of 1. Filtered by:. Previous template Next. Tags: None. June 8th,AM. The use of the data structure name in an SQL statement implies the list of subfield names making up the data structure. When a data structure contains one or more unnamed subfields, the data structure name cannot be used as a host structure in an SQL statement. The named subfields can be used as host variables. All my answers were extracted from the "Big Dummy's Guide to the As" and I take no responsibility for any of them.

Crash Course RPGLE - Part 9 - Sub routines & Sub Procedures - IBM i (AS400) - yusy4code

Comment Post Cancel. June 19th,AM. These fields are all the right length and type. Last edited by gcraill ; June 19th,AM.

as400 rpgle

Reason: Sorted The problem with quotes on the internet is that it is hard to verify their authenticity Abraham Lincoln. June 19th,PM. This keeps you from having to key in the data structure fields. June 20th,AM. Hi Greg: Shouldn't this Last edited by gcraill ; June 20th,AM. Reason: Update Or do I have to select ALL 18 fields?

June 20th,PM. I've used this same method to read a 3-way join from a selection into 3 file data structures on the :into statement, and then eval-corred each of thedata structures into a single workstation ds so that a display file screen could pull any of the fields it needed from all three files.

Come2AS400

All rights reserved. Yes No. OK Cancel.RPGLE as the latest version is known has got some heritage. Testing numeric values has evolved over years, lets look at two examples. The current version of RPGLE IBM i V7R1 at time of writing this has free form code, multitudes of built in functions and handles big system database crunching with as much ease as it handles little web page servlets. Personally, I find a few of the older functions still a bit annoying and wish there was a nicer way of handling them.

So, we need to CHECK that a value is truly numeric when importing from a alpha field into a numeric field. If you dont understand RPG, then what are you doing wasting time reading this technical blurb?

Lazy — Yes. Stupid — No! Nick Litten Dot Com is a mixture of blog posts that can be sometimes serious, frequently playful and probably down-right pointless all in the space of a day. Enjoy your stay, feel free to comment and in the words of the most interesting man in the world: Stay thirsty my friend. How to test for RPG numeric values in alphameric fields? IBM i. Sep Like this: Like Loading Really Related Posts.Understanding data types are one of the important things that you should do to work in any kind of language.

Here, in this article, you can get to know about all data types in AS Data types are like an index which tells the compiler about the kind of data a particular variable holds. It will not have alphabets or any special characters.

Because to have control over the data that we work with. For example, if we have only character type of data, then to store any number with any decimal places, we need to do validations in the program which will increase the coding effort.

But with the decimal data type, these are handled automatically. Also, any arithmetic operations, we can do easily on integer data types when compared to the character. Like these, there are a lot of specific uses for each data types. That you will understand while using them in your code. These are not data types in AS alone. You can see this kind of data types in almost all the languages around the world.

as400 rpgle

Numeric Signed Int — I Ex,Occupies 2, 4, 8 bytes for 5, 10, 20 length integers respectively. More on Integer datatype at, Integer data type in AS!

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Unsigned Int — U Ex, Similar to the signed integer. But the only difference is that this is only for positive values. Packed decimal — P Ex, which occupies 3 bytes.

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That is 12 in the first byte. The last byte will hold a number and sign or sign alone. Zoned decimal- S Ex, which occupies one 5 bytes. That is one byte for each number.In the middle of this RPG program, I want to reformat and replace some values in a big long address field.

So, like all programmers, I wonder off to the big filing cupboard and pull out the page programmers guide and search through the index.

Free Format

I always smile when I Google or Bing something I am an equal opportunity search engine user and the answer is on my blog. It makes me smile, but it also reminds me that my old brain just aint what it used to be. Spocks Brain is not as fuzzy as mine even when it was stolen. His brain was stolen, not mine. RPG has evolved and we now have a couple of much neater techniques to do the same thing.

Thanks IBM!

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Assume my variables are long varying strings and you can just do everything by simply typing something like:. Which just goes to show there is more than one way to skin a cat.

Which is a pretty gross saying if you think about it. Nick Litten Dot Com is a mixture of blog posts that can be sometimes serious, frequently playful and probably down-right pointless all in the space of a day. Enjoy your stay, feel free to comment and in the words of the most interesting man in the world: Stay thirsty my friend. Like this: Like Loading Really Related Posts.An RPG program once typically started off with File Specifications, listing all files being written to, read from or updated, followed by Data Definition Specifications containing program elements such as Data Structures and dimensional arrays, much like a "Working-Storage" section of a COBOL program.

This is followed by Calculation Specifications, which contain the executable instructions. Output Specifications can follow which can be used to determine the layout of other files or reports. In the early days of RPG, its major strength was known as the program cycle : every RPG program executes within an implied loopwhich can apply the program to every record of a file. The concept of level breaks and matching records is unique to the RPG II language, and was originally developed with card readers in mind.

RPG is one of the few languages created for punched card machines which are still in common use today, because it has evolved considerably over time. It was originally developed by IBM in The name Report Program Generator was descriptive of the purpose of the language: generation of reports from data files, including matching record and sub-total reports. Both languages were intended to facilitate ease of transition for IBM tabulating machine Tab unit record equipment technicians to the then-new computers.

Tab machine technicians were accustomed to plugging wires into control panels to implement input, output, control and counter operations add, subtract, multiply, divide. Tab machines programs were executed by impulses emitted in a machine cycle; hence, FARGO and RPG emulated the notion of the machine cycle with the program cycle. RPG IVa. Until Novemberthe free format applied exclusively to the calculation specifications. While editing can still be done via SEU, the simple green screen editor even though syntax checking is not supported for features introduced from IBM i V7R1 onwarda long progression of tools has been developed over time.

Eclipse, and therefore RDi, runs primarily on personal computers and other devices. Even with the changes, it retains a great deal of backward compatibility, so an RPG program written 37 years ago could run today with little or no modification. With the traditional F-Spec approach a developer had to identify a specific access path to a data set, now they can implement standard embedded SQL statements directly in the program.

The new Power Systems also adopt more mainstream version numbers, substituting 6. The latest release is now referred to as IBM i 7.

The threadsafe aspects of the language are considered idiosyncratic by some as the compiler team has addressed threads by giving each thread its own static storage, rather than make the RPG run-time environment re-entrant.

This has been noted to muddle the distinction between a thread and a process making RPG IV threads a kind of hybrid between threads and processes. The idea behind the new capability is to remove the necessity for all output from RPG programs to be forced into the limited data stream. Instead, it can be passed to handlers, which can transform it in any way the handler wants.

While many companies were skeptical about the usefulness of Open Access, it gained immediate acceptance from some others, including Profound Logic corporation, which rapidly incorporated it into their products aimed at opening the i, and hired Scott Klementa product developer well known for creating open-source tools to access the technology.

Note: The character in the data type column is the character that is encoded on the Definition Specification in the column designated for data type. To compare, in a language like C where definitions of variables are free-format and would use a keyword such as int to declare an integer variable, in RPG, a variable is defined with a fixed-format Definition Specification. In the Definition Specification, denoted by a letter D in column 6 of a source line, the data type character would be encoded in column Also, if the data type character is omitted, that is, left blank, the default is A if no decimal positions are specified, P when decimal positions are specified for stand-along fields, and S ZONED when decimal positions are specified within a data structure.

The following program receives a customer number as an input parameter and returns the name and address as output parameters. The same program is shown later with gradually more modern versions of the syntax and gradually more relaxed rules.The FOR operation allows us to "loop", perform the same section of code a specified number of times. Therefore, I would need to do something like this:.

Even though RPG programmers tend to be creatures of habit, I'll bet you dollars to donuts they didn't even realize the FOR operation code was avaiable. Or even better yet, asks me what language it's written in.

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The manuals have been on line for years, but you can't make them download them to say nothing about reading them. The thing I hate though is I like consistency. You've written all this code with DO. There's never enough time to go change the old code. OCD I guess. Hello folks -- a caveat I learned recently. The final iteration increments and then tests the value.

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Chipper: Better yet, declare the loop index as an integer variable, not decimal. Integer arithmetic is more efficient than decimal. Enddo Total control in the loop. I wish you could do this What does it look like in fixed-format? Been doing it over 30 years and I lke the fixed format. Thank goodness I can retire in a little over 2. I use "FOR" for looping through Arrays! RPG is an "evolving" language. It wasn't designed and created perfectly like so many new languages of today.

Are you re-writing code so it looks pretty or uses the latest op code? Bad idea. It may look ugly but if it's doing the job you'd be better served to leave it alone. I learned long ago not to do that. I agree with you.


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