So where does JOL get all the other informatoin for the DD card? Is there some back-end database that has information for all the files that may be used?

Tony Thigpen

Clem Clarke wrote on 07/10/2018 08:33 PM:
Below is an example of Jol, and the equivalent JCL.

Clem

Simplified Jol Scripting Language for Z/OS, TSO, Linux and Windows

Payroll: Job class C 1000 k;
Exec Validate Input.Trans, Trans.Action(+1); /* Validate Transations */
if Validate=0
then do;
     Sort transaction(+1) to Sorted.Trans.Actions(+1)
         Fields(10,10,CH,A);
     Exec Update Payroll.Master(0), Sorted.Trans.Action(+1),
         Payroll.Master(+1);
     If Update = 0
     then do;
         Catalog Payroll.Master(+1), Sorted.Trans.Action(+1);
         Submit Job2;
     end;
end;
else Stop 'Error in PAYROLL Job';


________________________________

Equivalent Existing Job Control Language


//PAYROLL   JOB      CLASS=C,REGION=1000K
//VALIDATE   EXEC     PGM=VALIDATE
//SYSPRINT   DD       SYSOUT=*
//INTRANS    DD       DSN=INPUT.TRANS,DISP=SHR
//OUTTRANS   DD       DSN=TRANS.ACTIONS(+1),DISP=(NEW,PASS),
//                    DCB=(RECFM=VB,LRECL=200,BLKSIZE=13030),
//                    SPACE=(CYL,(10,10),RLSE),
//                    UNIT=SYSDA,VOL=SER=WORK01
//SORT       EXEC     PGM=SORT,COND=(VALIDATE,NE,0)
//SYSOUT     DD       SYSOUT=*
//SORTWK01   DD       UNIT=SYSDA,SPACE=(CYL,20)
//SORTWK02   DD       UNIT=SYSDA,SPACE=(CYL,20)
//SORTWK03   DD       UNIT=SYSDA,SPACE=(CYL,20)
//SORTIN     DD       DSN=TRANS.ACTIONS(+1),DISP=(SHR,PASS)
//SORTOUT    DD       DSN=SORTED.TRANS.ACTIONS(+1),
//                    DISP=(NEW,PASS),
//                    DCB=(RECFM=VB,LRECL=200,BLKSIZE=13030),
//                    SPACE=(CYL,(10,10),RLSE),
//                    UNIT=SYSDA,VOL=SER=WORK01
//SYSIN      DD   *
         SORT FIELDS=(10,10,CH,A)
//UPDATE     EXEC     PGM=UPDATE,COND=(VALIDATE,NE,0)
//SYSPRINT   DD       SYSOUT=*
//MASTIN     DD       DSN=PAYROLL.MASTER(0),DISP=SHR
//TRANS      DD       DSN=TRANS.ACTION(+1),DISP=(SHR,PASS)
//MASTOUT    DD       DSN=PAYROLL.MASTER(+1),DISP=(NEW,PASS),
//                    DCB=(RECFM=VB,LRECL=200,BLKSIZE=13030),
//                    SPACE=(CYL,(10,10),RLSE),
//                    UNIT=SYSDA,VOL=SER=WORK01
//CATLG      EXEC     PGM=IEFBR14,COND=(UPDATE,NE,0)
//DUMMY1     DD       DSN=PAYROLL.MASTER(+1),DISP=(SHR,CATLG)
//DUMMY2     DD       DSN=SORTED.TRANS.ACTIONS(+1),
//                    DISP=(SHR,CATLG)
//SUBMIT     EXEC     PGM=IEBGENER,COND=(UPDATE,NE,0)
//SYSPRINT   DD       SYSOUT=*
//SYSUT1     DD       DSN=SUBMIT.LIBRARY(JOB2),DISP=SHR
//SYSUT2     DD       SYSOUT=(*,INTRDR)
//SYSIN      DD       DUMMY
//ERRMSG     EXEC     PGM=SHOWERR,COND=(VALIDATE,EQ,0),
//           PARM='Error in PAYROLL Job'



Andrew Rowley wrote:
On 9/07/2018 10:46 PM, Hobart Spitz wrote:

Basically, JCL is so far from real a programming language, that I can't
describe it.

That's because JCL isn't a programming language. There are plenty of other languages that also suck as programming languages e.g. HTML, XML, JSON, but that's not what they are supposed to be.

JCL is really a kind of definition language. In programming language terms it is more like a set of classes in OOP than a language in itself: you have a job, which has steps, steps have DDs etc. The syntax is old fashioned, but the concepts are very much OOP. It would be relatively simple to create a set of classes in your OOP language of choice to hide the syntax - just create a Job object, add Step objects, add DataDefinition objects etc. and have a Submit method emit JCL.

If I want to write a program, I will choose a programming language. If I want to define a unit of work to the system, JCL does a pretty good job. I definitely prefer JCL to long command lines with multiple switches and options defining input and output files, which is the non-z/OS equivalent.

Andrew Rowley
Black Hill Software

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