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RPG IV V5R1 Enhancements Presented by Barry Diehl
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At a Glance Built-In Functions (BIFs) Free-format Runtime Control of Files and Members Improved Error Control Increased Java support Miscellaneous Changes
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How did it happen? George Farr of IBM Toronto surveys users giving them a list of possible enhancements. Each enhancement is priced Survey participants can spend $100
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What didnt make it? Multiple dimension arrays Keylists in D specs More H-Spec Keywords Bitwise operations in expressions
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Built-In Functions
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Taking time %TIME{(expression{:time-format})} %TIMESTAMP{(expression{:*ISO|*ISO0})} %DATE{(expression{:date-format})} If no value specified, current system values are retrieved When the expression is *DATE, UDATE or a timestamp, dont use the format - the system knows the format
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One More Time %SECONDS(number) %MINUTES(number) %HOURS(number) %DAYS(number) %MONTHS(number) %YEARS(number) Determine date in 3 years newdate = date + %YEARS(3) Determine date 6 months ago loandate = date - %MONTHS(6)
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Whats the Difference? %DIFF(op1:op2:*MS|*S|*MN|*H|*D|*M|*Y) Determine the number of days between 2 dates NumDays = %Diff(LoanDate:DueDate:*D) Add number of minutes between the start and end TotalTime = TotalTime + %Diff(StartTime:EndTime:*MN)
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Parts Is Parts Extract a subset of a date, time or timestamp with %SUBDT %SUBDT(value:*MS|*S|*MN|*H|*D|*M|*Y) date = d1999-02-17; time = t01.23.45; num = %SubDt(date:*Y); // num = 1999 num = %SubDt(time:*MN); // num = 23
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A Well-Defined Search %LOOKUPxx(arg:array{:startindex{:numelems}}) - returns array index of the element in array that matches Where xx = – blank an exact match – LT value closest to arg, but less than arg – LE an exact match or the value closest to arg, but less than arg – GT value closest to arg, but greater than arg – GE an exact match or the value closest to arg, but greater than arg Zero is returned if no match found %Found and %Equal dont work on this function Use %TLOOKUPxx for tables
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Other Functions %ALLOC and %REALLOC %CHECK and %CHECKR %XLATE %SHTDN %SQRT
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Free-Format RPG
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Free-format Rules /FREE and /END-FREE Write code between columns 8 and 80 General form: opcode(extenders) Factor 1 Factor 2 Result Statements end with semi-colon End-of-line comments marked with // Compiler directives can be used Cant define fields or have result indicators Free and fixed can be mixed
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Function Replacements ADDDUR %YEARS, %MONTHS ALLOC %ALLOC CHECK %CHECK CHECKR %CHECKR EXTRCT %SUBDT LOOKUP %LOOKUPxx, %TLOOKUPxx MVR %REM OCCUR %OCCUR REALLOC %REALLOC
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Function Replacements SCAN %SCAN SHTDN %SHTDN SQRT %SQRT SUBDUR %DIFF or minus sign SUBST %SUBST TIME %DATE, %TIME, %TIMESTAMP XFOOT %XFOOT XLATE %XLATE
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Operator Replacement ADD + CAT + DIV / MULT * SUB -
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Generalize ANDxx AND DOUxx DOU DOWxx DOW IFxx IF ORxx OR WHENxx WHEN
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Social Engineering - Obsolete BITOFF use MOVE BITON use MOVE CABxx CAS and ENDCS COMP GOTO MHHZO MHLZO MLHZO MLLZO TAG
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Social Engineering – Moving to New CALL and CALLB CALLP DEFINE D spec – use LIKE or DTAARA keywords DO FOR END need to qualify the type now MOVE EVALR or built-in functions MOVEA MOVEL EVAL or built-in functions PARM and PLIST use prototype definition SETOFF and SETON EVAL TESTN and TESTZ Z-ADD and Z-SUB
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Free-Form Details KLIST and KFLD not included EVAL is optional Debug works fine Most examples in Reference are free-form Macro in CODE/400 performs one-way conversion Mix of Free and Fixed-formats is ok Compiler directives ok - but no SQL
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Fixed-format (page 1)
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Free-format (page 1)
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Fixed-format (page 2)
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Free-format (page 2)
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Fixed-format (page 3)
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Free-format (page 3)
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Fixed-format (page 4)
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Free-format (page 4)
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Runtime Control of Files and Members
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Use EXTFILE(file name) and EXTMBR(member name) as keywords in F Spec Need USROPN keyword too OVRDBF still has control
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Improved Error Control
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Current Checking Error indicator or Extender (E) – doesnt handle all situations *PSSR or INFSR subroutines – cant easily return to the statement that caused the problem
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Monitor Group MONITOR - marks beginning of code to trap errors ON-ERROR {exception-id1 {:exception-id2…}} Begins the group for one or more status codes. Can also use: – *PROGRAM - all program errors – *FILE - all file errors – *ALL - all errors ENDMON - marks the end of the group
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Monitor Group Example
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Monitor Group Example - page 2
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New Error Processing Order Statement indicators Opcode extenders, %STATUS, %ERROR MONITOR group INFSR *PSSR
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Increased Java Support (Many thanks to George Farr of IBM - these are his examples)
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RPG Calling JAVA: 3 options 1. Use QCMDEXC to launch the JVM for the Java class 2. Use system C-APIs to instantiate Java objects and call methods in them (Java Native Invocation or JNI) 3. Use V5R1 RPG enhancements that mask the JVN complexity
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Calling Java from RPG Declare Objects Prototype Java Methods Instantiate an Object
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Declare Objects D Test S O CLASS(*JAVA:java.lang.String) Must declare a field to hold the object reference – First parameter must be *JAVA – Fields of type O cannot be DS subfields – Arrays of objects are allowed – Fields of type O are NOT pointers, they only store references to objects
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Prototype Java Methods D trimstring PR O EXTPROC(*JAVA:java.lang.String:trim) DCLASS(*JAVA:java.lang.String) DSTATIC EXTPROC accepts 3 parameters – *JAVA keyword – package.class name of class containing method – Name of method or *CONSTRUCTOR Specify return type – Use CLASS keyword if it returns a Java object (O type) – Specify STATIC for static methods
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Instantiate an Object D crtBigDec PR OEXTPROC(*JAVA:java.math.BigDecimal:*CONSTRUCTOR) DCLASS(*JAVA:java.math.BigDecimal) D Parm1 8FVALUE D* D refflt S OCLASS(*JAVA:java.math.BigDecimal) D* D DblField S 8F INZ(0) C* Instantiate the class C* CEVALrefflt = crtBigDec(dblField) Prototype the desired constructor method Declare the object reference variable Call the constructor method, store result
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Calling Methods Example D fldS 10A INZ( Farr ) D strS O CLASS(*JAVA:java.lang.String) D* D makestringPR O EXTPROC(*JAVA:java.lang.String:*CONSTRUCTOR) D CLASS(*JAVA:java.lang.String) D parm 10A D* D makealpha PR 10A EXTPROC(*JAVA:java.lang.String:getBytes) D* D trimstring PR O EXTPROC(*JAVA:java.lang.String:trim) D CLASS(*JAVA:java.lang.String) CEVALstr = makestring(fld) CEVALstr = trimstring(str) CEVALfld = makeslpha(str)
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Miscellaneous Changes
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ELSEIF Can combine an ELSE and IF together If A = 1; X = X + 1; ElseIf A = 2; X = X + 2; ElseIf A = 3; X = X + 3; EndIf; Reduce number of ENDIFs and nesting levels Dont forget about SELECT
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Qualified Data Structure Names New keyword QUALIFIED - allows names to be reused in the program Useful in prototyped parameter definitions New keyword LIKEDS(data structure) - will have the same structure
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Qualified Data Structures Example
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Summary Built-In Functions (BIFs) Free-format Runtime Control of Files and Members Improved Error Control Increased Java support Miscellaneous Changes
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