This customer list is populated in the ile rpg as a very simple subfile. Rules, examples, techniques, and other cool stuff enter your mobile number or email address below and well send you a link to download the free kindle app. I recently had my rpg training, we started in free format the one where everything except c lines are in fixed and eventually ended up using full free format. As stated above, you can create a logical with a key over a nonkeyed file.
The specifics on subfiles ccording to ibm, a subfile is a group of records that have the same record format and are read from and written to. Ibm i and ile rpg books, tutorials, training bryan meyers. Update modify existing record ibm knowledge center. Appendix a describes each of these operations in detail. Most input and output functions are the same in freeformat rpg iv as in fixed. You cannot declare more than one object file in a cl programme.
Chain random retrieval from a file ibm knowledge center. Rules, examples, techniques, and other cool stuff ebook. Single page subfiles nick litten is ibmi, as400 iseries. Alas, some of the functionality that had been available in the fixed format was not available in the new free format. Now, this popular manual has been updated from beginning to end to teach subfile concepts and programming techniques using freeformat rpg.
Posts about rpgfree subfile programming written by ben. In subfiles in freeformat rpg, kevin vandever takes the reader through the subfile conceptfrom start to finish. Displaying subfiles loaded with sorted database records stack. Ibmi web sites directory books, manuals, ibmias400 education. Use the concept of subfile to display more than one record, but a single output message subfile is a special type of subfile that is supported well in cl. You can read the subfile by using the chain opcode using the rrn. Using this technique you will stop reading records when you reach the end of the subfile. If you are not able to use the totally free rpg, but can use free format. On their own, each feature is simple to code in an rpg subfile program. We cannot move to another record, which meets the same criteria specified in the.
The essential guide to freeformat rpg factor 1, if there is one, follows the operation code. The chain command does a setll and a reade in order to find a match. The only call possible in freeformat is the prototype call, callp. It looks like you are chaining with the first two keys of the file and the third key rpdoc isnt being used by the chain. To get the most from this book, work through all segments of the continued. Rules, examples, techniques, and other cool stuff book online at best prices in india on. Freeformat rpg now encompasses nearly all functional aspects of the language, and this third edition of freeformat rpg iv brings you uptodate on all the latest features.
Inputoutput using free format most input and output functions are the same in freeformat rpg iv as in fixed format except for the location of the code within the source line. Introducing freeformat rpg iv 31 freeformat operation codes table 41 lists the 62 operations that freeformat rpg iv supports as of v7. I cut a few corners to keep the code short, and at 191 lines im probably pressing my luck. If you have a specific value id that you know you want to delete, you can also set a read loop and test the id for matching values. Or do you want to delete a record from one position and insert it in a different position thereby shifting other records too.
Cusnam, cusadr, and custel are fields defined in a record, cusrec which is defined in the file cusinfo. Using keylist in factor1 with chain operation in free format rpg. The simple guide to learn java programming in no time programming,database, java for dummies. Basic coding figure 5 rpg program code indicator usage. For pagedownrename pagedown to indicator 21 in subfile definition. At least one space must separate the pieces of the statement. Kevin vandevers subfiles in rpg iv mc press, 2000 offered easytounderstand explanations of subfile concepts plus a bounty of practical examples, advanced techniques, and other cool stuff never before seen in subfile books. Freeform syntax, updatee name datastructure %fieldsname. Rpgle free template for a subfile application on rpgle. Freeformat rpg uses many of the same operation codes.
The way most of us learnt was through a very old book called the. This chapter, subfiles and data queues a perfect combination, looks at how to incorporate all the features in the program development manager pdm into a subfile. All i had to do was insert free and i could write all of what had been calculation specifications in free format code. So, instead of checking any resulting indicator we simply use %eof to check if the end of file is reached. Ibm i software developer, digital dad, as400 anarchist, rpg modernizer, alpha nerd and passionate eater of cheese and biscuits.
Using chain to access a subfile record in free format. Key list c klst1 klist c kfld filed01 c kfld filed02 free f03rrn0. Im a rusty rpg coder to be sure, so if you see anything glaringly stupid for which i have a knack. One more substantial difference introduced in free format is the use of alternatives to a key list in. You begin a block, or section, of freeformat rpg by first entering the compiler directive free, placing the slash in position 7 and leaving the rest of the source line positions 1280 blank. Find a best practice for integrating technologies in ibm redbooks explore, learn. Scusno, scusnam, scusadr, and scustel are fields defined in the subfile.
The corresponding record in the cusinfo file will be located with the chain operation and will be updated with the changed field. This loop is wayyyy too long to be considered good code in anyones book. The source for the display file and the product file used in the example follow the rpg source. Redisplaying the first page of a subfile is a major annoyance to users. Good code with rpg good code is its own best documentation. Rpg is still not 100% free there are still some areas where rpg is not yet free freeform code is still restricted to columns 8 80 i specs and o specs must still be coded in fixedform i and o specs are considered deprecated by many rpg programmers in favor of externallydescribed files code related to the rpg cycle must be coded in.
This is because the rollup and rolldown activities are handled by the program. Prototype call can be dynamic call or a bound call. Also, in a single page subfile both rollup and rolldown keywords must be defined in the dds of the subfile control format. After learning the expandable subfile processing with ile rpg in the previous chapter, a single page subfile should not be very difficult for you. Technically, each record that has the modify data tag set on is returned with the readc operation. Chain is best used to locate a unique record like a customer record from a full procedural file. Ibm had to go with the modern times and columnized programming language didnt appeal to many. Some free format examples only work with v5r1 and higher.
Then you can start reading kindle books on your smartphone, tablet, or computer no kindle device required. Your program could something like this in freeformat ile rpg assuming. Essentials of subfile programming and advanced topics in rpg iv. This article features an example rpg program i wrote with the tr 7. Danny, no you cant chain with key 2 and 3 while ignoring key 1. At this stage in the rpg iv cycle, the fields from the current record the record. For a workstn file, the chain operation retrieves a subfile record. No around the rrn thanks, jeff davis dental network of america booth martin sent by. This is the full source code for the subfile sort program that appeared in the may 2004 issue of the iseries extra newsletter. If its just a simple single field array youre sorting in order to use the much faster binary search possible with %lookup, for example, then sorta works well and is simple. How to bring your rpg programs into the 21st century erpg. Youll find a chapter devoted to the new freeformat h control, f file definition, d definition, and p subprocedure specifications.
Rules, examples, techniques, and other cool stuff written by kevin vandever and published by mc press. The sflcsrrrn keyword loads a fivedigit hidden field with the relative record number of the subfile record upon which the cursor is located. Freeformat rpg iv isnt case sensitive, so the compiler. Find answers to using chain to access a subfile record in free format. Unlike other books on the topic, this one specifically focuses on coding subfile applications in freeformat rpg and does an excellent job of explaining how to use subfiles in the modern rendition of the rpg language. The readc operation line 4 reads each record of the subfile that has been modified. Seven years later, 2001, came the first free format flavor. Youll need to use two keywords in the subfile control format.
In case of chain, the file operation is used to randomly retrieve a record from a file. You can go into a standard do loop reading the records in the subfile until you are done. In order call an external program in free format, you need to use prototype for the external program. I use setll to reposition the file pointer before reloading the subfile. With a subfile you always need to read the subfile records back either using readc or chain using rrn. All builtin functions are also available to you in free format. The modify data tag is a 5250 datastream flag that is switched on when the workstation user types data into a field that is displayed on the workstation. Freeform syntax, chainenhmr searcharg name datastructure. We are chaining to a file that has two record formats. The code accompanying this article is available for download here. Author of the definitive 2000 work subfiles in rpg iv. Nick litten dot com is a mixture of blog posts that can be sometimes serious, frequently playful and probably downright pointless all in the space of a day.
Display size condition names are valid and are required if the number of records. If the cursor is not located on a subfile record, this field is zero. Basically, rpg full free format is the younger, sexier version of the fixed format. If name refers to a subfile record format from an externally described display. For a zip file containing all the sources, click here. To expand from dales points, if your display is made of many record formats you need to do things in the following order. Reade, readp, readpe, chain, or primarysecondary file must be issued to. The display file compiler expects to process the subfile record format.
Easy steps to internet programming for as400, iseries, and system i. Rules, examples, techniques, and other cool stuff, this updated and expanded work is brought up to the present with freeformat rpg examples and other new material. Sorting data is something rpg programs often need to do. Programming in rpg iv, third edition download free epub. As a registered member of, youre entitled to a complimentary copy of chapter 7 of subfiles in rpg iv. For example, if sflpag and sflsiz are specified, and the subfile record format and sfllin value are specified such that three records can fit on a single display line, sflpag and sflsiz are increased to 15.
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