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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 make 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 book to coding RPG programs the use of free-kind RPG in an ILE atmosphere.
When constructing instructions and necessities, one of the most important 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 make 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 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 practice consistent standards to all 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 all 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, use /include instead of /reproduction and use all uppercase for named constants–these are conventions that are general to most (if not all) programming languages.
Use the right equipment
RDi (Rational Developer for i) can support with the implementation of specifications. gain knowledge of to make use of automatic Indent, the define View, content assist, Templates and Snippets: they could all support automate necessities and styles.
RPG Is Free-kind
contemporary RPG classes should still comprise handiest free-form code–they should still 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 fall back onto historic habits and coding practices.
If a call is made that existing classes don't seem to be going to be converted to free-kind RPG, then any changes to the courses should still 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, keep away from creating the condition where the code switches commonly between fastened-form and free-kind code. if you are making small modifications to fastened-kind code, consider changing that portion of fastened-kind code to free-kind before making your alterations.
contemporary RPG classes and Subprocedures
a contemporary RPG application makes use 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 sure 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 ability that the design of a subprocedure is such that it makes copious use 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 be effective somewhere else, it's an easy procedure to remove it from its existing module and area it right into a service program.
A subprocedure may still be designed to perform one assignment (calculate_Pay(), get_customerData() and many others.). it's good enough if the subprocedure has to name different subprocedures to obtain that single project. This, in turn, ability that subprocedures should still be brief and to the aspect. an excellent rule of thumb is to be in a position to see all of the executable code for a subprocedure in a single window in RDi.
additionally, in case you find yourself defining international variables, stop and ask yourself: Why?
earlier than searching at the add-ons of naming conventions, remember 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 all confer with the equal variable, whereas in a personal home page or Java application they might be 4 different variables. despite the fact, be sure you strive to use the identical blended-case form all over you use the identify.
Names should be meaningful. The limit of 10-personality gadget names on IBM i has made RPG programmers masters of abbreviation. it's a habit that must be broken. Names should still be significant and descriptive, and should not be confined by using a length (however perhaps make sure to steer clear of developing names as much as the optimum allowed size of 4096). just as a name may still now not be overly abbreviated, it should now not be overly verbose. for instance, the variable should still be customerID, not cusID or theIDOfTheCustomer.
When naming variables, arrays and information buildings, consider 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 example calculate_Pay(), get_customerData(), or convert_toCelsius();.
Use consistent abbreviations for your names. for example, if you have several procedures that do 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 still be mixed case. The average common is to use CamelCase. CamelCase means that a reputation is made of compound words where each word begins with a capital letter. the primary observe may beginning with a capital letter or with a decrease case letter but all 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 still 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 use underscore to separate 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 be advantageous when used with subroutine, subprocedure or prototype names. The underscore is used to separate the action from the item: calculate_Pay() or get_customerData().
Given right 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 separate the phrases in a named consistent (in case your average is to make use of all uppercase for named constants).
Use named constants instead of literals. regular names make 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 still mirror the characteristic of that regular, now not the value.
The conference in most programming languages is that steady names are all uppercase. accordingly, underscore should be used to separate compound words in the name.
compare the use of a literal:if (%fame(myFile) = 1218);
With the use of a named steady:if (%reputation(myFile) = ERR_RECORD_LOCKED);
If literals are commonplace all 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 way of an underscore.
for instance, a replica member includes here named constants used to establish message IDs. all the named constants begin 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, use a prefix comparable to type_, or typ_, or t_, or use 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 begin 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 still 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 use 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 correct naming conventions is that it reduces the want for detailed documentation since the code is self-explanatory. however, classes deserve to be documented.
feedback should still be used in two ways in RPG classes and subprocedures:
abstract feedback should be initially of each program and subprocedure. summary comments should still contain, at the least, right here information:
probably the most main advantages of free-kind RPG and appropriate naming conventions is that it reduces the requirement for precise commenting. distinctive commenting should best be required to explain some advanced coding method or to spotlight a strategy being used in the code.
Use clean traces to neighborhood and section code.
It will also be constructive to use a marker line remark to separate primary sections of a application, despite the fact the requirement for here's slightly nullified when using the Filter View function 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 definite modification. This practice may still be avoided. Specifying **FREE on the first line of code potential that positions 1 to 7 on all subsequent lines may be used for code.
All code may still 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 still be grouped together by using classification of declaration.
Declarations should still be grouped in order that connected items are described together. The manner interface may still be first, earlier than another declarations.
Indentation should still 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 type 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 still 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 couple of line of code, use alignment to make 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 effect in an unwieldy accumulation of ENDIFs on the end of the community. as a substitute use the greater versatile choose/WHEN/other/ENDSL or the IF/ELSEIF/ENDIF constructions.
Use choose/WHEN if the alternative statements all evaluate a particular variable to a collection of values. Use IF/ELSEIF if the alternative statements have assorted styles of conditions.
Use indentation and alignment to make SQL remark legible. An SQL formatter is attainable in Run 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 place 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 need 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 right 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); state 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 call 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 LIKE 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 all times provide the linked file name as a parameter.
unluckily, the %ERROR() built in function does not allow for a file name parameter, so at all times verify the %ERROR() function (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 use various length (VARCHAR) as adversarial to character (CHAR) fields. the use of varying size fields reduces the requirement for string functions (%TRIM and many others.) and makes the code more legible.
Subroutines should still no longer be used for modularization/structure. Subprocedures may still 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 equipment i Developer, which hosts the RPG & DB2 Summit conferences. he is an award-successful speaker who additionally speaks consistently at standard conferences, and is the author of “Re-engineering RPG Legacy applications,” “The Programmers book 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 use of the IT Jungle Contact page.
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