Any Questions!. Agenda Fun with Functions Externally Described Files Condition Names Iteration...
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Transcript of Any Questions!. Agenda Fun with Functions Externally Described Files Condition Names Iteration...
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Any Questions!
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Agenda
• Fun with Functions • Externally Described Files• Condition Names• Iteration• Logical Files• Random Reads
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Fun with Functions
ILEFUNCT
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Condition Names
• Used with Code Fields– Eg. ARE-THERE-MORE-RECORDS– Eg. FINAL-GRADE– Eg. Indicators
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Condition Names01 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.
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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.
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Conditions Cont’d01 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’.
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Conditions Cont’d01 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.
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Option Indicators and Conditions01 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
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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
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Iteration
Looping
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BASIC Perform Statement
PERFORM (paragraph-name)
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Basic PERFORM
READ Emp-FilePERFORM DSP-RtnSTOP RUN
DSP-RTNmove emp-in to emp-out.
write dsp-record format is ‘SCREEN’. read dsp-file record.
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PERFORM Until
PERFORM paragraph-nameUNTIL Condition
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PERFORM Until
ConditionMet?
Execute Program
Statements
NO
YES
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PERFORM Until
READ Emp-File AT END Move ‘YES’ TO EOF.
PERFORM Dsp-Rtn UNTIL EOF = ‘Y’
STOP RUN
DSP-RTNmove emp-in to emp-out.write dsp-record
format is ‘SCREEN’. read dsp-file RECORD. read emp-file
at endmove ‘YES’ to EOF.
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PERFORM X Times
PERFORM (paragraph-name) THROUGH/THRU (paragraph-name)(integer/variable) TIMES
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PERFORM X Times
Number ofTimes Met?
Execute Program
Statements
NO
YES
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PERFORM X Times
READ Emp-File AT END Move ‘YES’ TO EOF.
PERFORM Dsp-Rtn 5 TIMES
STOP RUN
DSP-RTNmove emp-in to emp-out.write dsp-record
format is ‘SCREEN’.
read dsp-file record.
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PERFORM With Test After
PERFORM (paragraph-name) THROUGH/THRU (paragraph-name)WITH TEST AFTERUNTIL Condition
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PERFORM With Test After
Condition Met?
Execute Program
Statements
NO
YES
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PERFORM With Test After
READ Emp-File AT END Move ‘YES’ TO EOF.
PERFORM Dsp-Rtn WITH TEST AFTERUNTIL EOF = ‘Y’
STOP RUN
DSP-RTNmove emp-in to emp-out.
write dsp-record format is ‘SCREEN’. read dsp-file record. read emp-file
AT ENDMOVE ‘YES’ TO
EOF.
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PERFORMs within PERFORMs
READ Emp-File AT END Move ‘YES’ TO EOF.
PERFORM DSP-Rtn UNTIL 5 TIMES
STOP RUN
DSP-RTNMOVE EMP-IN TO EMP-OUT.PERFORM Write-Rtn
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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
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Iteration Statement to Use?
• Perform X Times– Use this when you know the number of times
the paragraph(s) are to be executed.
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Sorting Data
Using Access Paths
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Physical Files vs Logical Files
EMPLOYEEPF *FILE
EMPLOYEE *FILE
Physical Files or Logical Files?
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Externally Described Files
• Select Statement when physical/logical file has a key.
SELECT Cobol-file-nameASSIGN TO database-actual-file-name[ORGANIZATION IS INDEXED][ACCESS MODE IS SEQUENTIAL] RECORD KEY is data-element.(data-element could be EXTERNaLLY-DESCRIBED-KEY)
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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)
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Handy Physical File Commands
DSPPFM – Display Physical File MemberDisplays the contents of a Physical File in arrival sequence.
DSPFD – Display File DescriptionInformation about the file – eg access path.
DSPFFD – Display File Field DescriptionDisplays the fields in the file.
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Random Reads
• Used to retrieve a record based on the value of a key field
• Need an access path sorted by the key field needed
• Select statement changes
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Defining a Random Access File
SELECT Employee-FileASSIGN to DATABASE-EMPPFORGANIZATION is INDEXEDACCESS MODE is RANDOMRECORD KEY is
EXTERNALLY-DESCRIBED-KEY(with duplicates).
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Random Reads• If the key field to EMPPF is the Employee-
Number then:Move 1 to Employee-Number.Read Employee-File
Invalid KeyMove ‘Error’ to Employee-Name-Out
Not invalid key Move Employee-Name to Employee-Name-
outEnd-Read.
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Validating the Province Code
Database object: PROVINCES