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one of the fundamental ideas of programming is that coding conventions (guidelines and standards) enhance the readability of supply code and construct software protection easier. Coding conventions supply the basis for developing applications which are effortless to preserve and adjust. this text and a piece of writing to ensue are a mode e reserve to coding RPG programs the expend of free-kind RPG in an ILE atmosphere.
When constructing instructions and necessities, one of the most censorious challenges is to check what is a common and what's a tenet. as an instance, code indentation would be a typical, however whether the code is indented by using two, three, or four characters can be a suggestion. one of the most aims of standards is to construct certain that required coding specifications are carried out with out impeding the creativity of the programmer.
just a further Programming Language
RPG has now done the distinction of being just one other programming language. This skill that many of the trend instructions and requisites that ensue to other programming languages (Java, Hypertext Preprocessor, and so on.) now ensue to RPG as well. when you are establishing in a multi-language ambiance, are trying to rehearse consistent standards to complete languages. as an instance, if the tenet for personal home page is to indent code through three characters, the tenet for indenting in RPG should be the same. Having consistent requirements throughout complete languages makes it more convenient for programmers to change between languages.
even though you aren't developing in a multi-language ambiance, that you could nonetheless be trained from other languages. as an instance, expend /include instead of /reproduction and expend complete uppercase for named constants–these are conventions that are universal to most (if not all) programming languages.
Use the privilege equipment
RDi (Rational Developer for i) can advocate with the implementation of specifications. gain scholarship of to construct expend of automatic Indent, the define View, content assist, Templates and Snippets: they could complete advocate automate necessities and styles.
RPG Is Free-kind
contemporary RPG classes should quiet comprise handiest free-form code–they should quiet now not be a combination of fastened-kind and/or prolonged factor-2 and/or free-form. complete free-form skill that loads of historical “bad habits” (circulation, MOVEL, GOTO, and so on.) are no longer purchasable. Coding most effective free-kind code skill that a programmer will no longer unintentionally drop back onto historic habits and coding practices.
If a convene is made that existing classes don't look to be going to be converted to free-kind RPG, then any changes to the courses should quiet be made in free-kind most effective.
whether writing new programs or enhancing current programs, best code in free-kind RPG. besides the fact that children, when editing existing classes, preserve away from creating the condition where the code switches commonly between fastened-form and free-kind code. if you are making little modifications to fastened-kind code, deem changing that portion of fastened-kind code to free-kind before making your alterations.
contemporary RPG classes and Subprocedures
a coincident RPG application makes expend of free-form syntax and is modular in constitution. This modular constitution is implemented with subprocedures. Subprocedures may well be coded internally in a module or they could be external (in a carrier program or one other confident module).
despite the fact assorted subprocedures might be coded inside a module, the approach to writing a subprocedure should be that the subprocedure is standalone. This capacity that the design of a subprocedure is such that it makes copious expend of local variables as opposed to world variables, and that every one required data it's exterior to the subprocedure is handed as parameters and/or a recur cost. quite simply put, feel of each subprocedure as a standalone program.
This mode to writing subprocedures potential that once it's determined that a subprocedure can be effective somewhere else, it's an simple procedure to remove it from its existing module and locality it privilege into a service program.
A subprocedure may quiet be designed to fulfill one assignment (calculate_Pay(), get_customerData() and many others.). it's superior enough if the subprocedure has to appellation different subprocedures to obtain that single project. This, in turn, capacity that subprocedures should quiet be brief and to the aspect. an excellent rule of thumb is to be in a position to contemplate complete of the executable code for a subprocedure in a single window in RDi.
additionally, in case you find yourself defining international variables, quit and query yourself: Why?
earlier than searching at the add-ons of naming conventions, recall that although RPG is a combined-case language, it isn't a case-sensitive language. This potential that, in an RPG software, the variable names customerID, CustomerID, customerid, and customerId complete confer with the equal variable, whereas in a personal home page or Java application they might be 4 different variables. despite the fact, be confident you strive to expend the identical blended-case profile complete over you expend the identify.
Names should be meaningful. The confine of 10-personality gadget names on IBM i has made RPG programmers masters of abbreviation. it's a utilize that must be broken. Names should quiet be significant and descriptive, and should not be confined by using a length (however perhaps construct confident to steer clear of developing names as much as the optimum allowed size of 4096). just as a appellation may quiet now not be overly abbreviated, it should now not be overly verbose. for instance, the variable should quiet be customerID, not cusID or theIDOfTheCustomer.
When naming variables, arrays and information buildings, deem of the appellation as a noun–it conveniently states what the “merchandise” is. as an example, currentAccountNumber, customerID, or customerList.
When naming subroutines, subprocedures or prototype names, believe of the appellation as a verb combined with a noun. In different words, there's an motion and an merchandise. as an instance calculate_Pay(), get_customerData(), or convert_toCelsius();.
Use consistent abbreviations for your names. for example, if you suffer several procedures that conclude the “convert” motion, be constant in how you identify the motion (“convert”, “cvt”, “conv”, and the like).
Names (with the exception of named constants) should quiet be mixed case. The average common is to expend CamelCase. CamelCase means that a reputation is made of compound words where each word begins with a capital letter. the primary keep may birth with a capital missive or with a subside case missive but complete following words would birth with a capital letter. for instance, CurrentAccountNumber or currentAccountNumber.
but, given that RPG isn't case sensitive, it's up to the programmer to comply with the guiding principle.
except for the underscore persona, particular characters (i.e., @, #, $) should quiet now not be used in names. one of the most particular characters are susceptible to alternate based on CCSID definitions and will be avoided.
The underscore persona can be used to add readability to a name. there's an inclination to expend underscore to sever compound words in a reputation, but this is always spare when CamelCase is being used. The appellation currentAccountNumber is simply as legible as current_Account_Number.
but underscore can be advantageous when used with subroutine, subprocedure or prototype names. The underscore is used to sever the action from the item: calculate_Pay() or get_customerData().
Given privilege here line of code:salary = calculatePay(97);
A programmer would deserve to assess even if earnings became being set by a appellation to the subprocedure calculatePay() or from point 97 of the array calculatePay. using underscore in subprocedure names would add readability to the code.income = calculate_Pay(ninety seven);
An underscore is additionally used to sever the phrases in a named consistent (in case your average is to construct expend of complete uppercase for named constants).
Use named constants instead of literals. regular names construct code self-documenting and simpler to preserve. The exception to here is using 0 and 1 in expressions when clearing, incrementing, and decrementing container values. a constant appellation may quiet mirror the characteristic of that regular, now not the value.
The conference in most programming languages is that constant names are complete uppercase. accordingly, underscore should be used to sever compound words in the name.
compare the expend of a literal:if (%fame(myFile) = 1218);
With the expend of a named steady:if (%reputation(myFile) = ERR_RECORD_LOCKED);
If literals are commonplace complete over an utility (i.e., status codes), the named constants should be defined in a copy member and blanketed in classes as required.
With the proviso that names should be meaningful, naming conventions will also be used to establish a utilization or grouping of variables or named constants. The conference is that the correlated names birth with the equal characters adopted by artery of an underscore.
for instance, a replica member includes here named constants used to establish message IDs. complete the named constants launch with MSGID_.dcl-C MSGID_CODE 'ERR0001'; dcl-C MSGID_DESCRIPTION 'ERR0002';
Use a common prefix or suffix to differentiate template variables and info. for instance, expend a prefix comparable to type_, or typ_, or t_, or expend a suffix comparable to _T, or _typ, or _type.
in the rare occasion when world variables are utilized in subprocedures, the names of the global variables launch with the characters g_.
When naming subprocedures and prototyped software calls, it is fundamental that the naming convention is constant. for instance, subprocedures that add assistance to a database may quiet start with add_ or write_, not a combination of both.
Naming conventions are in reality required for names that are described through replica participants or globally defined in a program/module. however the expend of native variables (in subprocedures) and qualified records constructions minimizes the requirement for naming conventions within subprocedures.
All classes should be documented. one of the most essential merits of free-kind RPG and revise naming conventions is that it reduces the want for particular documentation since the code is self-explanatory. however, classes deserve to be documented.
feedback should quiet be used in two ways in RPG classes and subprocedures:
abstract feedback should be initially of each program and subprocedure. summary comments should quiet contain, at the least, privilege here information:
probably the most main advantages of free-kind RPG and preempt naming conventions is that it reduces the requirement for precise commenting. distinctive commenting should best be required to elaborate some advanced coding mode or to spotlight a strategy being used in the code.
Use immaculate traces to neighborhood and section code.
It will also be constructive to expend a marker line remark to sever primary sections of a application, despite the fact the requirement for here's slightly nullified when using the Filter View role in RDi.
Positions 1 to five
historically, positions 1 to five may additionally were used to point out or flag lines that were changed for a confident modification. This rehearse may quiet be avoided. Specifying **FREE on the first line of code potential that positions 1 to 7 on complete subsequent lines may be used for code.
All code may quiet be structured. The specifications and instructions for declarative code and executable code might be slightly different.
Declarative code is described at the start of a module, software, or subprocedure. Definitions should quiet be grouped together by using classification of declaration.
Declarations should quiet be grouped in order that connected items are described together. The manner interface may quiet be first, earlier than another declarations.
Indentation should quiet be used with information structured to identify protecting constructions.
Align definitions so they are convenient to study. as an example, when defining stand-by myself variables, parameters or information structure subfields, align the information kind on each line. compare the definition of this information constitution with alignment.dcl-Ds APIError qualified; bytesprovided int(10) inz(%size(APIError)); bytesavail int(10) inz(0); msgid char(7); *N char(1); msgdata char(240); conclusion-Ds;
to one without alignment:dcl-Ds APIError qualified; bytesprovided int(10) inz(%measurement(APIError)); bytesavail int(10) inz(0); msgid char(7); *N char(1); msgdata char(240); end-Ds;
All executable code may quiet be indented. Indentation inside loops and agencies provides to the legibility of the code.if (messageCount() = 0) ; select; when CGIOption = 'CANCEL'; when CGIOption = 'DELETE'; failed = delete_Event(persistId); other; set_eventData(persistId : information); if (messageCount() = 0); failed = put_Event(persistId); endif; endSl; endIf;
If an announcement takes a yoke of line of code, expend alignment to construct the code greater legible.set_days_for_Event(information.adventure: %date(records.fromdate: *u . s . a .): %date(data.todate: *u . s .): %date(facts.wrkshpdate: *u . s .));
automated indent (and closure of handle block) can be set within the ILE RPG preferences for the far off programs LPEX Editor in RDi.
Deeply nested IF/ELSE/ENDIF code blocks are challenging to study and result in an unwieldy accumulation of ENDIFs on the discontinue of the community. as a substitute expend the greater many-sided choose/WHEN/other/ENDSL or the IF/ELSEIF/ENDIF constructions.
Use choose/WHEN if the alternative statements complete evaluate a particular variable to a collection of values. expend IF/ELSEIF if the alternative statements suffer assorted styles of conditions.
Use indentation and alignment to construct SQL remark legible. An SQL formatter is attainable in rush SQL Scripts in IBM i entry customers solutions.exec sql declare C001 scroll cursor for select event, daynum, agendaid, fromtime, totime, showseq, title from AGENDA the set adventure = :eventIn order by using event, daynum, showseq, agendaid for examine simplest;
Use Templates and qualified data buildings
Templates and certified records buildings provide a mode of obviously defining and documenting information gadgets in a software.
a certified data constitution skill that each one references to the information constitution subfields exigency to be qualified with the data constitution identify, fors instance, mailAddress.metropolis, mailAddress.state. This allows for for subfields with the equal identify to be defined in assorted facts buildings with out the probability of battle and in order that the association between a subfield and its information structure is obvious.
Defining a professional statistics structure as a template skill that the facts constitution may additionally no longer be used as an information structure but will also be used as the template for other data constructions that are described using the LIKEDS key phrase. In privilege here example, a reference to the subfield baseAddress.city could be invalid however a reference to the subfield mailAddress.metropolis can be valid.dcl-Ds baseAddress template certified; street1 char(30); street2 char(30); city varchar(20); status char(2) inz('MN'); zip char(5); zipplus char(four); end-Ds; dcl-Ds mailAddress likeds(baseAddress) inz(*likeDS);
Templates and qualified statistics buildings provide a brilliant capability of gathering together connected “work” variables in a software or offering parameters for a convene interface. The definition of the template facts structure may also be positioned within the identical replica member as the prototype definition for a referred to as application or subprocedure.
The LIKEREC keyword can even be used to define certified facts structures in keeping with enter/output data for an externally described file.
you can also define template fields (with the relish key phrase) and information (with the LIKEFILE keyword).
Qualify wherever viable
When the usage of inbuilt capabilities such as %EOF(),%discovered(),%EQUAL() and %popularity(), at complete times provide the linked file appellation as a parameter.
unluckily, the %ERROR() built in role does not allow for a file appellation parameter, so at complete times verify the %ERROR() role (or the %fame() feature) at once after an operation with an error (E) extender. Or shop the environment to a variable so for you to verify it later.
The more that you software for the web, the greater you're employed with strings.
When it comes to string managing, it's more advantageous to expend various length (VARCHAR) as adversarial to character (CHAR) fields. the expend of varying size fields reduces the requirement for string functions (%TRIM and many others.) and makes the code more legible.
Subroutines should quiet no longer be used for modularization/structure. Subprocedures may quiet be used instead. however subroutines can be valuable in organizing the common sense in a subprocedure.
To be persisted
The leisure of the instructions can be partly 2!
Paul Tuohy is CEO of ComCon, an iSeries consulting business, and is among the co-founders of gear i Developer, which hosts the RPG & DB2 acme conferences. he is an award-successful speaker who additionally speaks consistently at touchstone conferences, and is the author of “Re-engineering RPG Legacy applications,” “The Programmers reserve to iSeries Navigator,” and the self-look at course referred to as “iSeries Navigator for Programmers.” ship your questions or comments for Paul to Ted Holt by the expend of the IT Jungle Contact page.
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