Test268 Section 7

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Section 7 - RPG problem solving/problem determination (9%)

Find and interpret messages on message queues and in a job log

Use STRSRVJOB to debug a program running from another job

See Debug in Batch


Long Hand

Submit your program into batch and make sure it is held. Do this by either holding the job queue that you are submitting the job to, or use the HOLD(*YES) option on the SBMJOB command.

   * Use the WRKUSRJOB and display the job you with to debug with the display job option (5).
   * Write down the user name, job name and number.
   * Start a service job using STRSRVJOB entering the name, job name and number from the previous step.
   * STRDBG PGM(YOURPGM) - Press F12 to exit the source display (Sorry, can’t enter breakpoints yet).
   * Release your submitted job by releasing the job queue or the job itself.
   * A display will appear asking you to press F10 function key. Press F10 and you will be brought to a command line.
   * Enter DSPMODSRC and enter your breakpoints.
   * Leave source display and command line by pressing F3 until you are back to the screen that asks you to press F10 to enter breakpoints.
   * Press Enter to start your job.
   * After that the job begins running and stops at the first breakpoint reached. 


Short Hand

You can do what I did and create a command to combine these commands so that you only remember one command and not two.

Code a trigger program using RPG

The following RPG trigger program inserts records into the ATMTRANS file.

      * Program Name : INSTRG
      * This is an insert trigger for the application
      * file.  The application inserts the following three
      * records into the ATMTRANS file.
      *
      * ATMID   ACCTID   TCODE    AMOUNT
      * --------------------------------
      * 10001   20001      D      100.00
      * 10002   20002      D      250.00
      * 10003   20003      D      500.00
      *
      * When a record is inserted into ATMTRANS, the system calls
      * this program, which updates the ATMS and
      * ACCTS files with the correct deposit or withdrawal amount.
      * The input parameters to this trigger program are:
      *  - TRGBUF : contains trigger information and newly inserted
      *             record image of ATMTRANS.
      *  - TRGBUF Length : length of TRGBUF.
      *
     H        1
      *
      * Open the ATMS file and the ACCTS file.
      *
     FATMS    UF  E                    DISK         KCOMIT
     FACCTS   UF  E                    DISK         KCOMIT
      *
      * DECLARE THE STRUCTURES THAT ARE TO BE PASSED INTO THIS PROGRAM.
      *
     IPARM1       DS
      * Physical file name
     I                                        1  10 FNAME
      * Physical file library
     I                                       11  20 LNAME
      * Member name
     I                                       21  30 MNAME
      * Trigger event
     I                                       31  31 TEVEN
      * Trigger time
     I                                       32  32 TTIME
      * Commit lock level
     I                                       33  33 CMTLCK
      * Reserved
     I                                       34  36 FILL1
      * CCSID
     I                                    B  37  400CCSID
      * Reserved
     I                                       41  48 FILL2
      * Offset to the original record
     I                                    B  49  520OLDOFF
      * length of the original record
     I                                    B  53  560OLDLEN
      * Offset to the original record null byte map
     I                                    B  57  600ONOFF
      * length of the null byte map
     I                                    B  61  640ONLEN
      * Offset to the new record
     I                                    B  65  680NOFF
      * length of the new record
     I                                    B  69  720NEWLEN
      * Offset to the new record null byte map
     I                                    B  73  760NNOFF
      * length of the null byte map
     I                                    B  77  800NNLEN
      * Reserved
     I                                       81  96 RESV3
      * Old record ** not applicable
     I                                       97 112 OREC
      * Null byte map of old record
     I                                      113 116 OOMAP
      * Newly inserted record of ATMTRANS
     I                                      117 132 RECORD
      * Null byte map of new record
     I                                      133 136 NNMAP
     IPARM2       DS
     I                                    B   1   40LENG
      ******************************************************************
      * SET UP THE ENTRY PARAMETER LIST.
      ******************************************************************
     C           *ENTRY    PLIST
     C                     PARM           PARM1
     C                     PARM           PARM2
      ******************************************************************
      * Use NOFF, which is the offset to the new record, to
      * get the location of the new record from the first
      * parameter that was passed into this trigger program.
      *   - Add 1 to the offset NOFF since the offset that was
      *     passed to this program started from zero.
      *   - Substring out the fields to a CHARACTER field and
      *     then move the field to a NUMERIC field if it is
      *     necessary.
      ******************************************************************
     C                     Z-ADDNOFF      O       50
     C                     ADD  1         O
      ******************************************************************
      *         - PULL OUT THE ATM NUMBER.
      ******************************************************************
     C           5         SUBSTPARM1:O   CATM    5
      ******************************************************************
      *         - INCREMENT "O", WHICH IS THE OFFSET IN THE PARAMETER
      *           STRING.  PULL OUT THE ACCOUNT NUMBER.
      ******************************************************************
     C                     ADD  5         O
     C           5         SUBSTPARM1:O   CACC    5
      ******************************************************************
      *         - INCREMENT "O", WHICH IS THE OFFSET IN THE PARAMETER
      *           STRING.  PULL OUT THE TRANSACTION CODE.
      ******************************************************************
     C                     ADD  5         O
     C           1         SUBSTPARM1:O   TCODE   1
      ******************************************************************
      *         - INCREMENT "O", WHICH IS THE OFFSET IN THE PARAMETER
      *           STRING.  PULL OUT THE TRANSACTION AMOUNT.
      ******************************************************************
     C                     ADD  1         O
     C           5         SUBSTPARM1:O   CAMT    5
     C                     MOVELCAMT      TAMT    52
      *************************************************************
      *  PROCESS THE ATM FILE.                     ****************
      *************************************************************
      * READ THE FILE TO FIND THE CORRECT RECORD.
     C           ATMN      DOUEQCATM
     C                     READ ATMS                     61EOF
     C                     END
     C   61                GOTO EOF
      * CHANGE THE VALUE OF THE ATM BALANCE APPROPRIATELY.
     C           TCODE     IFEQ 'D'
     C                     ADD  TAMT      ATMAMT
     C                     ELSE
     C           TCODE     IFEQ 'W'
     C                     SUB  TAMT      ATMAMT
     C                     ELSE
     C                     ENDIF
     C                     ENDIF
      * UPDATE THE ATM FILE.
     C           EOF       TAG
     C                     UPDATATMFILE
     C                     CLOSEATMS
      *************************************************************
      *  PROCESS THE ACCOUNT FILE.                 ****************
      *************************************************************
      * READ THE FILE TO FIND THE CORRECT RECORD.
     C           ACCTN     DOUEQCACC
     C                     READ ACCTS                    62  EOF2
     C                     END
     C   62                GOTO EOF2
      * CHANGE THE VALUE OF THE ACCOUNTS BALANCE APPROPRIATELY.
     C           TCODE     IFEQ 'D'
     C                     ADD  TAMT      BAL
     C                     ELSE
     C           TCODE     IFEQ 'W'
     C                     SUB  TAMT      BAL
     C                     ELSE
     C                     ENDIF
     C                     ENDIF
      * UPDATE THE ACCT FILE.
     C           EOF2      TAG
     C                     UPDATACCFILE
     C                     CLOSEACCTS
      *
     C                     SETON                     LR

Define and create unit test scenarios

Define and create integration test scenarios

Define and create system test scenarios

Diagnose and eliminate errors resulting from numerical operations (e.g. divide by zero, decimal data errors, arithmetic overflow)

Diagnose and eliminate level checks

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