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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 create 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 follow are a mode e reserve to coding RPG programs the exhaust of free-kind RPG in an ILE atmosphere.
When constructing instructions and necessities, one of the most primary challenges is to check what is a common and what's a tenet. as an instance, code indentation would live a typical, however whether the code is indented by using two, three, or four characters can live a suggestion. one of the most aims of standards is to create sure 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 follow to other programming languages (Java, Hypertext Preprocessor, and so on.) now follow to RPG as well. when you are establishing in a multi-language ambiance, are trying to rehearse consistent standards to indelicate 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 live the same. Having consistent requirements throughout indelicate 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 live trained from other languages. as an instance, exhaust /include instead of /reproduction and exhaust indelicate uppercase for named constants–these are conventions that are common to most (if not all) programming languages.
Use the birthright equipment
RDi (Rational Developer for i) can advocate with the implementation of specifications. gain knowledge of to create exhaust of automatic Indent, the define View, content assist, Templates and Snippets: they could indelicate advocate automate necessities and styles.
RPG Is Free-kind
contemporary RPG classes should noiseless comprise handiest free-form code–they should noiseless now not live 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 Fall back onto historic habits and coding practices.
If a muster is made that existing classes don't seem to live going to live converted to free-kind RPG, then any changes to the courses should noiseless live 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, maintain away from creating the condition where the code switches commonly between fastened-form and free-kind code. if you are making miniature modifications to fastened-kind code, account changing that portion of fastened-kind code to free-kind before making your alterations.
contemporary RPG classes and Subprocedures
a synchronous RPG application makes exhaust of free-form syntax and is modular in constitution. This modular constitution is implemented with subprocedures. Subprocedures may well live coded internally in a module or they could live external (in a carrier program or one other sure module).
despite the fact assorted subprocedures might live coded inside a module, the approach to writing a subprocedure should live that the subprocedure is standalone. This competence that the design of a subprocedure is such that it makes copious exhaust 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 return cost. quite simply put, feel of each subprocedure as a standalone program.
This method to writing subprocedures potential that once it's determined that a subprocedure can live effective somewhere else, it's an effortless procedure to remove it from its existing module and belt it birthright into a service program.
A subprocedure may noiseless live designed to perform one assignment (calculate_Pay(), get_customerData() and many others.). it's obliging enough if the subprocedure has to name different subprocedures to obtain that unique project. This, in turn, competence that subprocedures should noiseless live brief and to the aspect. an excellent rule of thumb is to live in a position to note indelicate of the executable code for a subprocedure in a unique window in RDi.
additionally, in case you find yourself defining international variables, cease and ask 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 indelicate deal with the equal variable, whereas in a personal home page or Java application they might live 4 different variables. despite the fact, live sure you strive to exhaust the identical blended-case contour indelicate over you exhaust the identify.
Names should live meaningful. The limit of 10-personality gadget names on IBM i has made RPG programmers masters of abbreviation. it's a usage that must live broken. Names should noiseless live significant and descriptive, and should not live confined by using a length (however perhaps create sure to steer clear of developing names as much as the optimum allowed size of 4096). just as a name may noiseless now not live overly abbreviated, it should now not live overly verbose. for instance, the variable should noiseless live customerID, not cusID or theIDOfTheCustomer.
When naming variables, arrays and information buildings, account of the name 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 name as a verb combined with a noun. In different words, there's an motion and an merchandise. as an specimen calculate_Pay(), get_customerData(), or convert_toCelsius();.
Use consistent abbreviations for your names. for example, if you fill several procedures that conclude the “convert” motion, live constant in how you identify the motion (“convert”, “cvt”, “conv”, and the like).
Names (with the exception of named constants) should noiseless live mixed case. The incurious common is to exhaust CamelCase. CamelCase means that a reputation is made of compound words where each word begins with a capital letter. the primary keep may beginning with a capital epistle or with a dwindle case epistle but indelicate following words would beginning 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 noiseless now not live used in names. one of the most particular characters are susceptible to alternate based on CCSID definitions and will live avoided.
The underscore persona can live used to add readability to a name. there's an inclination to exhaust underscore to sunder compound words in a reputation, but this is always superfluous when CamelCase is being used. The name currentAccountNumber is simply as legible as current_Account_Number.
but underscore can live advantageous when used with subroutine, subprocedure or prototype names. The underscore is used to sunder the action from the item: calculate_Pay() or get_customerData().
Given birthright here line of code:salary = calculatePay(97);
A programmer would deserve to assess even if earnings became being set by a name 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 sunder the phrases in a named consistent (in case your incurious is to create exhaust of indelicate uppercase for named constants).
Use named constants instead of literals. regular names create 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 name may noiseless mirror the characteristic of that regular, now not the value.
The conference in most programming languages is that steady names are indelicate uppercase. accordingly, underscore should live used to sunder compound words in the name.
compare the exhaust of a literal:if (%fame(myFile) = 1218);
With the exhaust of a named steady:if (%reputation(myFile) = ERR_RECORD_LOCKED);
If literals are commonplace indelicate over an utility (i.e., status codes), the named constants should live defined in a copy member and blanketed in classes as required.
With the proviso that names should live meaningful, naming conventions will too live 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 pass of an underscore.
for instance, a replica member includes here named constants used to establish message IDs. indelicate the named constants commence 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, exhaust a prefix comparable to type_, or typ_, or t_, or exhaust 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 commence 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 noiseless 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 exhaust of aboriginal variables (in subprocedures) and qualified records constructions minimizes the requirement for naming conventions within subprocedures.
All classes should live documented. one of the most essential merits of free-kind RPG and correct naming conventions is that it reduces the want for circumstantial documentation since the code is self-explanatory. however, classes deserve to live documented.
feedback should noiseless live used in two ways in RPG classes and subprocedures:
abstract feedback should live initially of each program and subprocedure. summary comments should noiseless contain, at the least, birthright here information:
probably the most main advantages of free-kind RPG and commandeer naming conventions is that it reduces the requirement for precise commenting. distinctive commenting should best live required to explain some advanced coding method or to spotlight a strategy being used in the code.
Use antiseptic traces to neighborhood and section code.
It will too live constructive to exhaust a marker line remark to sunder primary sections of a application, despite the fact the requirement for here's slightly nullified when using the Filter View duty 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 positive modification. This rehearse may noiseless live avoided. Specifying **FREE on the first line of code potential that positions 1 to 7 on indelicate subsequent lines may live used for code.
All code may noiseless live structured. The specifications and instructions for declarative code and executable code might live slightly different.
Declarative code is described at the start of a module, software, or subprocedure. Definitions should noiseless live grouped together by using classification of declaration.
Declarations should noiseless live grouped in order that connected items are described together. The manner interface may noiseless live first, earlier than another declarations.
Indentation should noiseless live 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 ilk 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 noiseless live 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, exhaust alignment to create 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 ply block) can live 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 upshot in an unwieldy accumulation of ENDIFs on the abide of the community. as a substitute exhaust the greater versatile choose/WHEN/other/ENDSL or the IF/ELSEIF/ENDIF constructions.
Use choose/WHEN if the alternative statements indelicate evaluate a particular variable to a collection of values. exhaust IF/ELSEIF if the alternative statements fill assorted styles of conditions.
Use indentation and alignment to create SQL remark legible. An SQL formatter is attainable in evade 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 residence 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 method of obviously defining and documenting information gadgets in a software.
a certified data constitution skill that each one references to the information constitution subfields necessity to live qualified with the data constitution identify, fors instance, mailAddress.metropolis, mailAddress.state. This allows for for subfields with the equal identify to live 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 live used as an information structure but will too live used as the template for other data constructions that are described using the LIKEDS key phrase. In birthright here example, a reference to the subfield baseAddress.city could live invalid however a reference to the subfield mailAddress.metropolis can live valid.dcl-Ds baseAddress template certified; street1 char(30); street2 char(30); city varchar(20); situation 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 muster interface. The definition of the template facts structure may too live positioned within the identical replica member as the prototype definition for a referred to as application or subprocedure.
The LIKEREC keyword can even live used to define certified facts structures in keeping with enter/output data for an externally described file.
you can too define template fields (with the fancy 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 indelicate times provide the linked file name as a parameter.
unluckily, the %ERROR() built in duty does not allow for a file name parameter, so at indelicate times verify the %ERROR() duty (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 exhaust various length (VARCHAR) as adversarial to character (CHAR) fields. the exhaust of varying size fields reduces the requirement for string functions (%TRIM and many others.) and makes the code more legible.
Subroutines should noiseless no longer live used for modularization/structure. Subprocedures may noiseless live used instead. however subroutines can live valuable in organizing the common sense in a subprocedure.
To live persisted
The leisure of the instructions can live partly 2!
Paul Tuohy is CEO of ComCon, an iSeries consulting business, and is among the co-founders of paraphernalia i Developer, which hosts the RPG & DB2 summit 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 exhaust of the IT Jungle Contact page.
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