Call Slides

8/7/2019 Call Slides

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Static Call Simple Program


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STATIC CALL: Main Program


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STATIC CALL: Compile JCL


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STATIC CALL: RUN JCL


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Dynamic call :Sub Program


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Dynamic Call : Main Program


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Dynamic Call Main Pgm Compile JCL


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DYNAMIC CALL MAIN PROGRAM RUN JCL


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Rules for coding CALLed programs

The called program needs to have a LINKAGE SECTION. This must appear after

the WORKING-STORAGE SECTION in the DATA DIVISION.

The PROCEDURE DIVISION needs to have a USING clause. This identifies the

variables passed to the program and their ordering.

Entries in the LINKAGE SECTION can be in any order, but the entries in the

USING clause must be in the order of their usage in the CALL statement of

the CALLing program.

Instead of a STOP RUN statement, the called program must contain an EXIT

PROGRAM statement to transfer control back to the calling program.


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SORTING AND MERGING

DATA FILES

Overview


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COBOL Sorting

Records in files must be sorted into specific sequences for Updating,

Querying or Generating Reports.

Sorting is a common procedure used for arranging records into a

specific order so that sequential processing can be performed.

Sorting is done on the basis of a key field numeric or non numeric


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Simplified Sort Syntax.

The WorkFileName identifies a temporary work file that the SORT

process uses for the sort. It is defined in the FILE SECTION using an SD

entry.

Each SortKeyIdentifier identifies a field in the record of the work file

upon which the file will be sequenced.

When more than one SortKeyIdentifier is specified, the keys decrease in

significance from left to right (leftmost key is most significant, rightmost

is least significant).

InFileName and OutFileName, are the names of the input and output

files. These files are automatically opened by the SORT. When the SORTexecutes they must not be already open.

_ a

_ a_ a

SORT

USING

GIVING

WorkFileName ONASCENDING

DESCENDINGKEY SortKeyIdentifier

InFileName

OutFileName

- -

-

-


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FD SalesFile.

01 SalesRec.

02 salesmanno pic x(5)

02 FILLER PIC X(5).

SD WorkFile.

01 WorkRec.

02 WSalesmanNum PIC 9(5).02 FILLER PIC X(5).

FD SortedSalesFile.

01 SortedSalesRec.

02 SalesmanNum PIC 9(5).

02 ItemType PIC X.

02 QtySold PIC 9(4).

PROCEDURE DIVISION.

Begin.

SORT WorkFile ON ASCENDING KEY WSalesmanNum

USING SalesFile

GIVING SortedSalesFile.

Sort Example.


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SORTSORT

ProcessProcess

WorkFileWorkFile

How the SORT works.


USING SalesFile


SalesFileSalesFile SortedSalesFileSortedSalesFile

Unsorted

Records

Sorted

Records


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INPUT FILE


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OUTPUT File


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SIMPLE SORT PROGRAM


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SIMPLE SORT PROGRAM


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RUN JCL


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SIMPLE SORT OUTPUT


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SORTSORT

ProcessProcess

How the INPUT PROCEDURE works.


INPUT PROCEDURE IS SelectHatSales


WorkFileWorkFile

SalesFileSalesFile SortedSalesFileSortedSalesFile

Sorted

Records

SelectHatSalesSelectHatSales

Unsorted

Hat

Records

Unsorted

Records


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OPEN INPUT InFileName

READ InFileName RECORD

PERFORM UNTIL ConditionRELEASE SDWorkRec

READ InFileName RECORD

END-PERFORM

CLOSE InFile

INPUT PROCEDURE Template


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COBOL SORT Release

The input procedure opens the input file, processes input recordsand releases them into the sort file. It is similar to writing arecord to the sort file.

The format of RELEASE is :

RELEASE Sort-record-name-1

[ FROM Identifier-1 ]


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COMPLEX SORT:INPUT PROCEDURE


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COMPLEX SORT:INPUT PROCEDURE


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COMPLEX SORT: INPUT PROCEDURE


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COMPLEX SORT:RUN JCL


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COMPLEX SORT : OUTPUT FILE


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COMPLEX SORT : Input File


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COBOL SORT: OUTPUT

PROCEDURE


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COBOL SORT Output Procedure

In case of sort if the giving option is used, then the sorted records areautomatically written onto the out-file after they are used.

Instead of giving option an output procedure can be used.

In an input procedure we RELEASE records to a sort file rather than WRITINGthem. In an output procedure we RETURN records from the sort file ratherthan READING them.


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COBOL SORTOutput Procedure e.g.

MAIN-PARA.

SORT WORK-FILE

USING IN-FILE

OUTPUT PROCEDURE CHECK-PARA.

STOP RUN.

In the paragraph CHECK-PARA:

Open output file.

Return records from sort file. Process records before writing to Out-file.

Close the file.


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COBOL SORTTypical Program

MAIN-PARA.

SORT SORT-FILE ON ASCENDING KEY TRANS-NO

USING INPUT-FILE

OUTPUT PROCEDURE CALC-PARA.

STOP RUN.

CALC-PARA.OPEN OUTPUT OUTPUT-FILE.

PERFORM PROCESS-PARA UNTIL NO-MORE-RECORDS = NO

CLOSE OUTPUT-FILE.

PROCESS-PARA.

RETURN SORT-FILE AT END MOVE NO TO NO-MORE-RECORDS.

IF AMT-OF-PURCHASE > 6000

MOVE 0.02 TO DISCOUNT

ELSE

MOVE 0.00 TO DISCOUNT

END

-IF.

WRITE OUT-REC FROM SORT-REC.


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COMPLEX SORT: Output Procedure


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Complex Sort : Output Procedure


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COMPLEX SORT : OUTPUT PROCEDURE


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COMPLEX SORT : RUN JCL


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COMPLEX SORT: OUTPUT DATA


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COBOL Merge

COBOL has a MERGE statement that will combine two or more filesinto a single file.

The MERGE statement automatically handles the opening, closing,and any I-O (read/write functions) associated with the files.

The files to be merged must be in sequence by the key-field(ascending or descending).


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COBOL MergeMerge syntax

MERGE file-1 { ON ASCENDING KEY data -1}

DESCENDING

USING file-2 { file-3 } . . .

OUTPUT PROCEDURE IS proc-1

GIVING {file-4}.


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COBOL Merge Typical Program

FILE CONTROL.

SELECT IN-FILE1 ASSIGN TO E-FILE1.

SELECT IN-FILE2 ASSIGN TO E-FILE2.

SELECT M-FILE ASSIGN TO WORK.

SELECT OUT-FILE ASSIGN TO E-FILE.

DATA DIVISION.

FD IN-FILE1.

01 IN-REC1 PIC X(100).FD IN-FILE2.

01 IN-REC2 PIC X(100).

SD M-FILE.

01 M-REC.

05 KEY-FIELD PIC X(5).

05 REST-OF REC PIC X(100).

FD OUT-FILE.01 OUT-REC PIC X(100).

PROCEDURE DIVISION.

MAIN-PARA.

MERGE M-FILE ON ASCENDING KEY KEY-FIELD

USING IN-FILE1, IN-FILE2

GIVING OUT-FILE

STOP RUN


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COBOL Sort & Merge Summary

SORT is used for sorting records in either ascending or descending order

Processing of records can be carried out before or after sorting by using Inputor Output procedures or using both

Merge is used to merge two or more files

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