Cics Trianing Class 08

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FILE HANDLING

CICS Training Class-08

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Types of VSAM Cluser

Types of VSAM datasets used in CICS are

!ntry Se"uenced #ataset $!S#S% &'A S!()M

Key Se"uenced #ataset $KS#S% K!* S!()M

&elati+e &ecord #ataset $&S% &&, S!()M

DTATSET TYPE ACCESSED USING ACCESS MODE

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Ser!i"es #ro!i$e$ %y CICS

'asic peration &e"uired or A ile Are

Adding A &ecord

Modifying A !/isting &ecord

#eleting A !/isting &ecord

'rowsing ne r All &ecords

&eading A &ecord

Addition CICS Pro+ides

!/clusi+e Control n &ecord 0e+el

pening And Closing

1ournaling

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De&ning A File To CICS

ile s2ould be defined in CT $ ile Control Table%

CT will contain all t2e information about a file $ 0i3e dataset name 4

access met2ods4 permissions etc.%

#efining file can be done eit2er by C!#A transition or #5CTmacro

C!#A #! I0!$I0!-,AM!% 6$6-,AM!%

C!#A I,S I0!$I0!-,AM!% 6$6-,AM!%

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File Han$ling In #rogra'

ile s2ould not be defined in program

Program s2ould not open or close a file

&ecords can be inserted updated or deleted

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Se(uenial )ea$

Se"uential read is done by 'rowse peration

!stablis2ed t2e pointer to t2e first record to read using

STA&T'&

,e/t and pre+ious records can be read as re"uired using

&!A#,!7T and &!A#P&!V.

!nd t2e browse operation at last 8sing !,#'&

'rowse can be re-positioned 8SI,6 &!S!T'&

#uring browse operation records cannot be updated

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STA)T%) Co''an$

EXEC CICS STARTBR

FILE(FILENAME)

RIDFLD(DATA-AREA)

END-EXEC.

Condition #ISA'0!# 4 I!&& 4 ,T,#4 ,TP!,

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)EADING AFTE) STA)T%)

Se"uentially T2e ,e/t And Pre+ious &ecord Can 'e &ead 'y A

&!A#,!7T r &!A#P&!V

T2e irst &!A#,!7T r &!A#P&!V 9ill &ead T2e &ecord92ere T2e STA&T'& 5as Positioned T2e ile Pointer

&!A#,!7T ollowed 'y &!A#P&!V r Vice Versa peration

9ill Always &ead T2e Same &ecord

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)EADNE*T+ )EAD#)EV

EXEC CICS READNEXT | READPREV

FILE(NAME)

INTO(DATA-AREA)RIDFLD(DATA-AREA)

END-EXEC.

Conditions #8PK!* !,#I0! I!&& 0!,6!&& ,T,#

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END%),SE

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)ESET%)

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)EAD Co''an$

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)ITE Co''an$

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Delee Co''an$

#elete;s a record from t2e file

&ecord can be deleted in two ways

&andomly wit2 &I#0# 2a+ing full 3ey

&ecord read wit2 8P#AT! command one by one

Multiple records can be deleted by pro+iding 6eneric option

EXEC CICS DELETE

FILE(FILE NAME)RIDFLD(DATA-AREA)

END-EXEC

Conditions #ISA'0!#. I!&&4 ,TP!,4 ,T,#

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.NL,C/ Co''an$

T &!0!AS! t2e record w2ic2 2as been loc3ed by read wit2

8P#AT! command

Synta/

EXEC CICS UNLOC

FILE(FILENAME)

END-EXEC.

Conditions I!&&4 I,V&!(

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