Any Questions!. Agenda Fun with Functions –how to get the system date –How to get the next...
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Transcript of Any Questions!. Agenda Fun with Functions –how to get the system date –How to get the next...
Any Questions!
Agenda
• Fun with Functions
– how to get the system date
– How to get the next service date
• INDARA and SI
• Condition Names
• Iteration
• Logical Files
• Positioning the file pointer
Fun with Functions
ILEFUNCT
Condition Names
• Used with Code Fields– Eg. ARE-THERE-MORE-RECORDS– Eg. FINAL-GRADE– Eg. Indicators
Condition Names
01 ARE-THERE-MORE-RECORDS PIC X(3) VALUE ‘YES’.88 THERE-ARE-MORE-RECORDS VALUE ‘YES’.88 END-OF-FILE VALUE ‘NO’.
IF THERE-ARE-MORE-RECORDSREAD EMPLOYEE-FILE.
IF END-OF-FILEPERFORM TERMINATION-RTN.
Set Verb
• Used to initialize fields to a Condition-Name.
01 ARE-THERE-MORE-RECORDS PIC X(3).
88 THERE-ARE-MORE-RECORDS VALUE ‘YES’.
88 END-OF-FILE VALUE ‘NO’.
SET END-OF-FILE TO TRUE.
Conditions Cont’d
01 WORK-DAYS PIC X(3).88 MONDAY VALUE ‘MON’.88 TUESDAY VALUE ‘TUE’.88 WEDNESDAY VALUE ‘WED’.88 THURSDAY VALUE ‘THU’88 FRIDAY VALUE ‘FRI’.
SET MONDAY TO TRUE.IF FRIDAY
DISPLAY ‘GO HOME EARLY’.
Conditions Cont’d
01 FALL-MONTHS PIC X(3).88 SEPTEMBER VALUE ‘SEP’.88 OCTOBER VALUE ‘OCT’.88 NOVEMBER VALUE ‘NOV’.88 DECEMBER VALUE ‘DEC’.
IF OCTOBERDISPLAY ‘HAPPY HALLOWEEN!!’
SET DECEMBER TO TRUE.
Option Indicators and Conditions
01 WS-indicators. 05 IN90 INDICATOR 90 PIC 1.
88 display-message value B’1’.88 dont-display-message value B’0’.
Set display-message to true.Set dont-display-message to true.If display-messageIf don’t-display-messageIf not display-message
Response Indicators and Conditions
01 WS-Control.05 ws-function-key pic x(2).
88 F3 value ’03’88 F12 value ’12’.88 Enter value ’00’
05 ws-device-name pic x(10).05 ws-record-format pic x(10).
If F3If not F3
Iteration
Looping
BASIC Perform Statement
PERFORM (paragraph-name)
Basic PERFORM
READ Emp-File
PERFORM DSP-Rtn
STOP RUN
DSP-RTN
move emp-in to emp-out.
write dsp-record
format is ‘SCREEN’.
read dsp-file record.
PERFORM Until
PERFORM paragraph-name
UNTIL Condition
PERFORM Until
ConditionMet?
Execute Program
Statements
NO
YES
PERFORM Until
READ Emp-File
AT END Move ‘YES’ TO EOF.
PERFORM Dsp-Rtn UNTIL EOF = ‘Y’
STOP RUN
DSP-RTN
move emp-in to emp-out.
write dsp-record
format is ‘SCREEN’.
read dsp-file RECORD.
read emp-file
at end
move ‘YES’ to EOF.
PERFORM X Times
PERFORM (paragraph-name) THROUGH/THRU (paragraph-name)
(integer/variable) TIMES
PERFORM X Times
Number ofTimes Met?
Execute Program
Statements
NO
YES
PERFORM X Times
READ Emp-File
AT END Move ‘YES’ TO EOF.
PERFORM Dsp-Rtn
5 TIMES
STOP RUN
DSP-RTN
move emp-in to emp-out.
write dsp-record
format is ‘SCREEN’.
read dsp-file record.
PERFORM With Test After
PERFORM (paragraph-name) THROUGH/THRU (paragraph-name)
WITH TEST AFTER
UNTIL Condition
PERFORM With Test After
Condition Met?
Execute Program
Statements
NO
YES
PERFORM With Test After
READ Emp-File
AT END Move ‘YES’ TO EOF.
PERFORM Dsp-Rtn
WITH TEST AFTER
UNTIL EOF = ‘Y’
STOP RUN
DSP-RTN
move emp-in to emp-out.
write dsp-record
format is ‘SCREEN’.
read dsp-file record.
read emp-file
AT END
MOVE ‘YES’ TO EOF.
PERFORMs within PERFORMs
READ Emp-File
AT END Move ‘YES’ TO EOF.
PERFORM DSP-Rtn UNTIL 5 TIMES
STOP RUN
DSP-RTN
MOVE EMP-IN TO EMP-OUT.
PERFORM Write-Rtn
Iteration Statement to Use?
• Perform Until– Tests for the condition first– Statements are executed only if the condition is
true
• Perform With Test After– tests for the condition last– Statements are always executed at least once
Iteration Statement to Use?
• Perform X Times– Use this when you know the number of times
the paragraph(s) are to be executed.
Sorting Data
Using Access Paths
Physical Files vs Logical Files
EMPLOYEEPF *FILE
EMPLOYEE *FILE
Physical Files or Logical Files?
Externally Described Files
• Select Statement when physical/logical file has a key.
SELECT Cobol-file-name
ASSIGN TO database-actual-file-name
[ORGANIZATION IS INDEXED]
[ACCESS MODE IS SEQUENTIAL]
RECORD KEY is data-element.
(data-element could be EXTERNaLLY-DESCRIBED-KEY)
Externally Described Files
• Copying the record layout.
FD Cobol-file-name.01 Cobol-Record-Name.COPY DD-actualrecordname OF actualfilename.
(DD can be replaced by DDS if you require the 10 char field names instead of the aliases)
Handy Physical File Commands
DSPPFM – Display Physical File Member
Displays the contents of a Physical File in arrival sequence.
DSPFD – Display File Description
Information about the file – eg access path.
DSPFFD – Display File Field Description
Displays the fields in the file.
Positioning the File Pointer
Start Verb
Start Verb
Used only with Sequentially defined files.
Initialize the record key
START file-nameKey ConditionINVALID KEY
Perform Invalid-LogicNOT INVALID KEY
Perform valid-logicEND-START.