VSAM to DB2 Conversion

7/26/2019 VSAM to DB2 Conversion

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VSAM to DB2

Online And Batch Program Conversion Strategy

Version 1.0

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VSAM to DB2 Online and Batch Program Conversion Strategy

Preface

Scope and audience

This document is intended to assist in converting online programs using COBOL CICS

and batch programs using COBOL which access VSAM files to access B! tables"

"

Objectives

VSAM to B! conversion

Structure of this document

ocument discusses schema translation strateg# initiall#" Translation of batch COBOL

access calls for VSAM to B! is discussed" Translation of CICS access calls to B!

access calls is detailed out ne$t for each of the CICS commands for %SS files" The

document ends with the performance tuning issues to be considered"

Related documents

VSAM to DB2 error handling document

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Table of contents

1 OVERVIEW............................................................................................................................................6

2 SCHEMA TRANSLATION...................................................................................................................6

3 CONVERSION STRATEGY................................................................................................................7

&"' BATC()*O+*AMT*A,SLATIO,"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""''&"'"' Specific Translation *ules""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""''

&"'"! Se-uential Organi.ation Se-uential Access"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""'!3.1.2.1 INPUT.............................................................................................................................................123.1.2.2 I-O...................................................................................................................................................133.1.2.3 OUTPUTE!TEN".......................................................................................................................13

&"'"& Inde$ed Organi.ation Se-uential Access"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""'&3.1.3.1 INPUT.............................................................................................................................................133.1.3.2 I-O...................................................................................................................................................13.1.3.3 OUTPUT E!TEN".....................................................................................................................1!

&"'"/ Inde$ed Organi.ation *andom Access"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""'03.1.#.1 INPUT.............................................................................................................................................1!3.1.#.2 I-O...................................................................................................................................................1!

3.1.#.3 OUTPUT........................................................................................................................................ 1!&"'"1 Inde$ed Organi.ation #namic Access""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""'0

3.1.$.1 INPUT.............................................................................................................................................1"3.1.$.2 I-O...................................................................................................................................................223.1.$.3 OUTPUT........................................................................................................................................ 2#

&"! O,LI,2)*O+*AMT*A,SLATIO,"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""!0

&"!"' *2A""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""!33.2.1.1 %&'c()*'..........................................................................................................................................2$3.2.1.2 CICS S+'(a,...................................................................................................................................2$3.2.1.3 Tra'a()*' *f S+'(a,....................................................................................................................2$

&"!"! STA*TB*""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""&'3.2.2.1 %&'c()*'..........................................................................................................................................313.2.2.2 CICS S+'(a,...................................................................................................................................313.2.2.3 %ranslation o& Synta'......................................................................................................................31

&"!"& *2A,24T 5 *2A)*2V"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""&/3.2.3.1 %&'c()*'..........................................................................................................................................3(3.2.3.2 CICS S+'(a,...................................................................................................................................3(3.2.3.3 Tra'a()*' *f S+'(a,.....................................................................................................................3

&"!"/ 6*IT2""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""&73.2.#.1 %&'c()*'..........................................................................................................................................3"3.2.#.2 CICS S+'(a,...................................................................................................................................3"3.2.#.3 Tra'a()*' *f S+'(a,.....................................................................................................................3"

&"!"1 *26*IT2"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""&33.2.$.1 %&'c()*'..........................................................................................................................................3$3.2.$.2 CICS S+'(a,...................................................................................................................................3$3.2.$.3 Tra'a()*' *f S+'(a,.....................................................................................................................3$

&"!"8 2L2T2"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""/93.2.#.1 )unction...........................................................................................................................................(*3.2.6.2 CICS S+'(a,...................................................................................................................................(*3.2.6.3 Tra'a()*' Of S+'(a,....................................................................................................................(*

&"!"0 :,LOC%""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""/!3.2.7.1 %&'c()*'..........................................................................................................................................(23.2.7.2 CICS S+'(a,...................................................................................................................................(23.2.7.3 Tra'a()*' *f S+'(a,....................................................................................................................(2

&"!"7 2,B*"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""/&3.2./.1 %&'c()*'..........................................................................................................................................(33.2./.2 CICS S+'(a,...................................................................................................................................(33.2./.3 Tra'a()*' Of S+'(a,....................................................................................................................(3

&"!"3 *2S2TB*"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""//


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3.2.0.1 %&'c()*'..........................................................................................................................................((3.2.0.2 CICS S+'(a,...................................................................................................................................((3.2.0.3 Tra'a()*' Of S+'(a,....................................................................................................................((

# OPTIMIING %OR PER%ORMANCE.............................................................................................#/

/"' S 2L2CTI,+O,L;T(2*2C:*SO*""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""/3

1"'"! Se-uential *ead STA*T>C:*SO*"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""191"'"& Se-uential *ead *2A>C:*SO*""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""1'

1"'"/ *andom *ead"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""1!

1"'"1 Insert""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""1&

1"'"8 *andom *ewrite"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""1/1"'"0 elete"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""18

1"'"7 O)2,>C:*SO*"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""10

1"'"3 STA*T>C:*SO*""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""17

1"'"'9 *2A>C:*SO*"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""13

1"'"'' ependant>Cursor>'""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""891"'"'! ependant>Cursor>n""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""89

1"'"'& ependant>:pdatable>Cursor>'""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""89

1"'"'/ ependant>:pdatable>Cursor>n""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""891"'"'1 =2TC(>)A*A>'"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""8'

1"'"'8 =2TC(>)A*A>n"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""8'

1"'"'0 I,S2*T>)A*A>'"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""8!

1"'"'7 I,S2*T>)A*A>n"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""8!1"'"'3 :)AT2>)A*A>'"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""8&

1"'"!9 :)AT2>)A*A>n"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""8&

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1 Overview%his document discusses translation strategy &or VSAM access calls a++earing in online COBO, C-CS and

atch COBO, +rograms y S/,s to access DB2 tale.

0m+hasis is on one to one translation o& each VSAM access call to DB2 access S/,s.

2 Schema Translation

During this +hase o& the migration VSAM &ile schema needs to e translated to relational schema.

)or this a com+lete ma++ing document needs to e +re+ared &or the VSAM &iles eing converted to DB2

tales. %his document has the VSAM &ile name the record name co+yoo name &or this &ile the &ield

names o& the record ith the corres+onding DB2 tale names column names data descri+tion &or thecolumns indicators to identi&y hether nulls are alloed the column is an inde' and ma++ing e'ce+tions

o& any ind. -t is understood that in such conversion there are cases o& multi+le ma++ing lie one VSAM

&ile ma++ed to many tales many VSAM &iles ma++ed to one tale di&&erent record ty+es o& a VSAM &ilema++ed to di&&erent tales one &ield o& a VSAM record ma++ed to multi+le columns o& a tale many&ields o& a VSAM record ma++ed to one tale column.

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3 Conversion Strategy

%he conversion is ased on the &olloing translation rules 4

1. COBO, source code ill remain same e'ce+t &or the introduction o& ne code and commenting o&

e'isting code as +art o& translation. 5e code ill e either emedded S/, statements or COBO,constructs or -5C,6D0 co+yoos to su++ort translation. Comments ill e added to indicate the

+rogram changes done.

2. DC,705 variales ill e used as host variales. %hese values ill e moved into the VSAM &ile

structure &or the +rogram +rocessing.

3. VSAM se8uential o+erations ill e translated using cursors on the associated tales.

(. -9O o+erations on array &ields o& the record ill e translated using cursors &or normalised cases. -ndenormalised cases the array &ields ill e translated to the corres+onding columns on the DB2 tale.

. 5o cursor ill e de&ined i& &ile is o+ened in O6%P6% or 0:%05D mode.

#. Any su++orted COBO, construct related to VSAM &ile hich is translated to relational e8uivalent ornot needed any more ill e commented.

!. -n case o& commenting OP05 statements i& the same statement o+ens some other non;VSAM &iles or

VSAM &iles hich ill not e converted an OP05 statement to o+en those &iles ill e added in the

+rogram and the original OP05 statement ill e commented.

". -n case o& commenting C,OS0 statements i& the same statement closes some other non;VSAM &iles orVSAM &iles hich ill not e converted an C,OS0 statement to close those &iles ill e added in the

+rogram and the original C,OS0 statement ill e commented.

$. At any +oint o& time there ill e only one cursor o+ened +er tale. Cursors ill e de&ined and

o+ened ith various conditions ased on organiD0> B? condition &or inde'ed &iles.

=ith =@0>0 condition &or S%A>% and >0AD

=ith )O> )0%C@ &or read only o+eration

=ith )O> 6PDA%0 &or u+date o+erations

11. S%A>% o+erations ill e translated to cursor declaration ith =@0>0 condition. %he condition used

in the =@0>0 condition ill e same as the condition stated in the S%A>%. -& S%A>% uses 0/6A,

%O then the ill e used in the =@0>0 condition. -& S%A>% uses 7>0A%0> %@A5 then ill

e used in the =@0>0 condition.

12. S%A>% can use a &ull;ey or +artial ey. %he translation ill de+end on the ty+e o& ey used as ell asthe ey length s+eci&ied.-& S%A>% uses &ull ey then the columns ma++ed to this ill e used in the

=@0>0 clause. -& S%A>% statement uses +artial ey there are 2 cases 4a. i& the eylength is a constant non at conversion time the S%A>% ill e translated to

D0C,A>0 C6>SO> using the tale columns corres+onding to this ey length s+eci&ied.

. -& the ey length is calculated at run time it needs to e analysed and suitale =@0>0 clause

should e used in the D0C,A>0 C6>SO> clause.

13. Any column corres+onding to ey &ields o& the VSAM &ile needs to e used as an inde' on the tale.Alternate record eys can e considered as inde' on tales. %his needs tale to e inde'ed on columns

corres+onding to alternate record eys.

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1(. C,OS0 ill e translated to closing the cursorEsF de&ined on the corres+onding tale. -& same C,OS0

statement closes non;VSAM &iles or VSAM &iles not eing converted se+arate close statement to

close the these &iles ill e generated and included in the source code.

1. Standard error Paragra+hs ill e +er&ormed to tae care o& any S/,COD0 checing.

1#. All the )-,0 S%A%6S logic used y the +rogram ill e retained &or conditional +rocessing. %he )-,0

S%A%6S &or the converted VSAM &ile ill e set y the standard error +rocessing logic de+ending onthe value o& S/,COD0 returned

1!. One;to;one ma++ing ill e handled y translating the VSAM access to the corres+onding S/,

statement.

Se-uential Operation for VSAM file

a" Se8uential >0AD o+erations ill e translated to cursor )0%C@.

b" Se8uential >0=>-%0 ill e translated to 6PDA%0 ith C6>>05% O) condition.

c" Se8uential D0,0%0 ill e translated to D0,0%0 ith C6>>05% O) condition.

*andom Operation for VSAM file

a. >andom >0AD o+erations ill e translated to S0,0C% ith =@0>0 condition.

. >andom >0=>-%0 ill e translated to 6PDA%0 ith =@0>0 condition.

c. >andom D0,0%0 ill e translated to D0,0%0 ith =@0>0 condition.

d. =>-%0 ill e translated to -5S0>% ith VA,60S clause.

1". -n the case o& one;to;many ma++ing the &olloing scenarios are +ossile 4

a. One VSAM &ile having di&&erent record ty+es ma++ed to di&&erent tales

Se-uential Operation on the VSAM file

0'am+le o& this is header and detail records in a VSAM &ile. -n DB2 there can e tale

de&ined &or header records and another tale de&ined &or detail records. Any se8uential read o&this VSAM &ile ill e translated to o+ening a cursor on the header tale then &etch cursor

on the header tale. 6sing the ey retrieved &rom the header tale o+en a cursor on the

detail tale and continue &etch using this cursor until end;o&;cursor then close the cursor onthe detail tale. Again &etch the cursor on the header tale and continue the +rocess o& o+en

cursor and &etch cursor on the detail tale.

)or any se8uential u+date or delete o+erations on this VSAM &ile the same translation

strategy ill e used ut ith the cursor o+tion )O> 6PDA%0.

*andom Operation on the VSAM file

-& the VSAM &ile is eing read randomly using a ey value moved ithin the +rogram then

the +rogram &lo needs to e analysed to determine hich tale needs to e accessed.

. )ields o& one VSAM &ile ma++ed to di&&erent tales

-n such cases any in+ut;out+ut o+eration on this VSAM &ile ill e translated to an e8uivalentS/, statements to access data &rom all the associated tales.


)or a se8uential read on this &ile a cursor ill e de&ined hich ill Goin re8uired data &romall the associated tales.

)or any se8uential u+date or delete on the &ile individual cursors ill e de&ined on the

associated tales ith the )O> 6PDA%0 clause. -n the case o& a VSAM &ile ma++ed to to

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DB2 tales the cursor on the &irst tale ill e &etched then the cursor on the second tale

ill e &etched. -& oth the ros &etched have the same ey then the DC,705 values are

&ormatted as re8uired and moved to the COBO, layout o& the &ile. Values &or any u+dates to

e made are moved in and the tales are u+dated. -n case the eys &etched y the to cursorsare not same then this may e either ecause o& some invalid data in one o& the tales or

ecause some ros are eing added into either o& the tales &rom some other VSAM &ile.

Since this may e a valid case as +er a++lication design additional analysis ill e re8uired.


)or a random read translate to a S0,0C% clause using a Goin &rom the associated tales.

)or rite rerite or delete translate to a -5S0>% 6PDA%0 or D0,0%0 ith conditional

e'ecution. -& the o+eration on the &irst tale as success&ul then only attem+t a similaro+eration on the other tale.

c. Many VSAM &iles ma++ed to one tale


%ranslate the se8uential o+eration to cursor o+eration on the tale using only the columns

&rom tale hich has een ma++ed &rom the &ields o& this VSAM &ile. =hile inserting use

de&ault values &or the columns coming &rom other &iles. =hile u+dating u+date only the tale

columns ma++ed &rom the &ile eing reritten.


)or read select only the tale columns hich have een ma++ed &rom the &ile eing read.)or delete veri&y i& the ro is +resent in the tale e&ore attem+ting a delete &rom the tale

-& +resent then do a delete else do not attem+t to delete. %his is ecause the delete o+eration

hich might have een +er&ormed on the other VSAM &ile hich also ma+s to this tale

might have already deleted the entire ro. )or u+date u+date only the tale columns hichhave een ma++ed &rom this &ile. )or insert veri&y i& the ey eing inserted is already +resent

in the tale i& +resent then do an u+date instead o& an insert else do an insert. %his is ecause

this ro might already have een inserted hen a rite as +er&ormed on the other &ile hich

also ma+s to this tale. =hile inserting use de&ault values &or the columns coming &rom other&iles.

d. One &ield ma++ed to multi+le columns

One field split into different columns

Situations ere a &ield &rom the VSAM &ile is s+lit into tale columns ill e taen care o& as

+er the s+litting s+eci&ied in the ma++ing in+ut. %his ill e valid &or any &ields in the &ile

hich is ty+e D-SP,A?. But any attem+t to s+lit a &ield de&ined as COMP or COMP;3 illneed additional analysis.

One field mapped to different columns

-n situations ere a hole &ield can e ma++ed to di&&erent columns de+ending on someconditional +rocessing the e'ce+tion logic associated ith the ma++ing &or that &ield ill

have to e used. %his e'ce+tion logic ill also e used to assign the +ro+er DC,705

&ield to the COBO, &ield.

1$. =hile +o+ulating de&ault values &or any 5O% 56,, &ields in the DB2 tale assume * &or numeric and

SPAC0S &or C@A> &ields as de&ault.

Any 56,, &etched &rom the tale ill e inter+reted as a * i& the receiving &ield is numeric or as

SPAC0S i& the receiving &ield is al+hanumeric.

2*. Be&ore u+dating or inserting into any column hich has a numeric data ty+e in DB2 +er&orm a

numeric;chec. -& the value is non;numeric assign the null indicator &or nullale &ields and* &or non;nullale &ields.

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21. )or grou+s containing numeric items ma++ed to a single numeric column the grou+ ill e treated as

an al+hanumeric and moved into the numeric column. Such translation ill hold good only i& the

numeric values in the su;&ields can e treated as an al+hanumeric value &rom the usiness +oint o&vie. )or e'am+le it is o to ma+ a grou+ item having su;items as account and su;account oth

numeric into a single numeric tale column as account. But i& the same translation is +er&ormed &or

items lie amounts then the result ill e un+redictale.

22. -n many situations a &ield de&ined in the VSAM layout and the corres+onding DB2 tale column ill

have di&&erent lengths this is ecause the dataty+es in VSAM and DB2 are di&&erent and have their

on &ield length restrictions.

23. )or variale length VSAM &iles eing used in the +rogram the tale ill have columns corres+onding

to the OCC6>S &ields. %he numer o& columns ill e the ma'imum +ossile value o& the OCC6>S

clause. A&ter conversion to tales there ill e a column &or each occurance o& the variale occurance

&ield although all the columns may not e used or not have values +o+ulated in them. =ithin the+rogram the logic ill e to use all the occurances o& the &ield ut this may not e in tune ith the

e'isting +rogram logic.

2(. 5e &ields de&ined in the tales &or any &uture use ill e +o+ulated ith the de&ault values.

2. -n case o& C-CS +rograms a record can e read into an area ithin the +rogram or into the C-CS

u&&er. -n the later situation a +ointer is used &or accessing the u&&er area here the record is read into.

A&ter translation the use o& this +ointer ill e avoided &or data read &rom tales. De&ine a *1 levelitem ith length e8ual to the record length &or the &ile &or hich the +ointer as used. A&ter accessing

data &rom the tales &ormat and move this data to the record layout as ell as to this nely de&ined

data item. Any use o& the data stored in the u&&er identi&ied y the +ointer ill e re+laced y using

the nely de&ined data item.

2#. %ranslate a S%A>% rose >0AD50:% o+eration into OP05 cursor and )0%C@ cursor. A&ter

each &etch the ey values retrieved ill e saved and ill e com+ared ith the ey value e&ore the

ne't &etch. -& the ey values match continue ith the &etch else close the cursor and then o+en a necursor using the current ey values and continue the &etch o+eration. %his &eature ill allo the si+

se8uential +rocessing to e converted correctly.

2!. Any VSAM &iles used in internal +rogram sorting ill also e translated to S/, statements.

2". A&ter conversion many &ile OP05 statements ill have een commented ecause they are not re8uired

&or an inde'ed &ile hich is converted to DB2 tale. -n such cases the &ile status &or these commented

&iles have to e set u+ +ro+erly so that +rogram +rocessing continues normally. %his can e done ysetting the &ile status to ** &or the &ile OP05 hich as commented out.

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3.1 Batch Program Translation

3.1.1 Specific Translation Rules

)olloing sections s+eci&y the translation strategy &or each o& the valid &ile -9O o+eration &or VSAM &iles.

%he rules are organi


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arra#>n>table>'>col>' )irst column in the &irst tale corres+onding to the nth array

db!>arra#>n>table>'>col>'>fld>' )ield in the nely de&ined record corres+onding to the &irst &ield o& the

nth array hich has ma++ing column in the &irst tale

arra#>n>table>'>col>n 5th column in the &irst tale corres+onding to the nth array

db!>arra#>n>table>'>col>n>fld>n )ield in the nely de&ined record corres+onding to the nth &ield o& thenth array hich has ma++ing column in the &irst tale

arra#>n>table>n 5th tale corres+onding to the nth array

arra#>n>table>n>col>' )irst column in the nth tale corres+onding to the nth array

db!>arra#>n>table>n>col>'>fld>' )ield in the nely de&ined record corres+onding to the &irst &ield o& thenth array hich has ma++ing column in the nth tale

arra#>n>table>n>col>n 5th column in the nth tale corres+onding to the nth array

db!>arra#>n>table>n>col>n>fld>n )ield in the nely de&ined record corres+onding to the nth &ield o& thenth array hich has ma++ing column in the nth tale

b!>arra#>n>si.e 5ely generated data item to store the si'>?e#>col>' )irst ey column in the &irst tale containing columns corres+onding

to the scalar &ields o& the record

table>'>?e#>col>n 5th ey column in the &irst tale containing columns corres+onding to

the scalar &ields o& the record

at>end>statements -m+erative statements to e e'ecuted on end o& &ile

not>at>end>statements -m+erative statements to e e'ecuted on not end o& &ile

Invalid>?e#>statements -m+erative statements to e e'ecuted on invalid ey

,ot>invalid>?e#>statements -m+erative statements to e e'ecuted on valid ey

b!>count 5ely generated data item to ee+ the loo+ count.

3.1.2 Sequential Organization Sequential ccess

All the -9O o+erations in &iles ith se8uential organiO)2,>C:*SO*

05D;0:0C

13


12/63


3.1.2.2 !%O

Cursor efinition @

OP05;C6>SO>

O5era()*' "ecr)5()*' Tra'a(e C*e

OP05 O+en the de&ined cursor. 0:0C S/,

OP05 file'>O)2,>C:*SO*05D;0:0C.

>0AD Se8uential;>ead;OP05;C6>SO>

>0=>-%0 >andom;>erite

C,OS0 Close the o+ened cursor. 0:0C S/,C,OS0 file'>O)2,>C:*SO*

05D;0:0C

3.1.2.3 O$T#$T&'(T'")


OP05 Comment C,OS0 statement 5one

=>-%0 -nsert ne ros into res+ective tales. -nsert

C,OS0 Comment the C,OS0 statement. 5one

3.1.3 !nde*ed Organization Sequential ccess

All the -9O o+erations in a &ile ith inde' organi%. )or &iles o+ened in

-5P6% or -;O mode 8uery translation varies ased on the e'istence o& S%A>% on the &ile. -n each o& the

aove to o+en modes there are to sections S%A>% 0:-S%S and S%A>% DO0S 5O% 0:-S%s+eci&ying the corres+onding translation strategies.

3.1.3.1 !"#$T

3.1.3.1.1 STRT '(!STS

%his section s+eci&ies the translation strategy &or VSAM &iles ith inde'ed organi% is used.

De&ine a cursor &or each VSAM &ile to select all the ros in the corres+onding tales.

-& S%A>% is used and i& it uses &ull record ey in ey com+arison de&ine a cursor to select all the ros in

the corres+onding tales here ey columns have values greater than or e8ual to the record ey values.

De&ine the aove cursors to e O>D0> B? +rimary ey columns o& one o& the tales.

De&ine a condition name in the oring storage section to e set and reset y S%A>% and OP05

statements hen they o+en and close the cursor. %his condition name ill indicate the current o+enedcursor to e used y other o+erations.

De&inition o& the condition name ill e

*1 file'>C:*SO* P-C $ VA,60 *.

"" file'>O)2, value 1.

"" file'>STA*T>*% value 2.

=here file'>O)2,ill e set hen the cursor corres+onding to OP05 is o+ened

file'>STA*T>*% ill e set hen the cursor corres+onding to S%A>% is o+ened.

Cursor definition for O)2, @

1(


13/63


OP05;C6>SO>

Cursor definition for STA*T @

S%A>%;C6>SO>


OP05 O+en the cursor file'>O)2,>C:*SO* . %his

ill select all the ros in the tale. Set this cursorto e the current valid cursor hich can then eused y successive -9O o+erations till S%A>%

re+ositions the &ile +osition indicator or C,OS0

closes the &ile.

0:0C S/,

OP05 file'>O)2,;C:*SO*

05D;0:0C.

MOV0 1 %O file'>C:*SO* .

S%A>% Start re+ositions the &ile +osition indicator y

+o+ulating record ey &ields ith a++ro+riate

values. -& the corres+onding cursor is already

o+ened close the cursor and o+en it again.>eo+ening the cursor ill select the ros ased on

the current value o& the host variales used in the

=@0>0 clause. Set H&ile1;S%A>%;>I;

C6>SO> to e the current valid cursor hich can

e used y successive -9O o+erations till anotherS%A>% re+ositions the &ile +osition indicator or

C,OS0 closes the &ile.

-) H&ile1;S%A>%;>I

%@05

0:0C S/,

C,OS0 file'>STA*T>

*%>C:*SO*05D;0:0C

05D;-).

0:0C S/,

OP05 file'>STA*T>*%>C:*SO*

05D;0:0C.


>0AD or

>0AD

50:%

-n se8uential access &iles >0AD 50:% is same as

>0AD. Both o& them are se8uential read.

>0AD 9 >0AD 50:% can &ollo either any one

o& OP05 S%A>% or another >0AD9>0AD50:%.

-& S%A>% e'ists then cursor to &etch ill e

decided ased on the &lag hich states the current

valid cursor. COBO, 0VA,6A%0 statement ill

e used to mae the decision.

0VA,6A%0 file'>C:*SO*

=@05 file'>O)2,

Se8uential;>ead;OP05;

C6>SO>=@05 file'>STA*T>*%

Se8uential;>ead;S%A>%;

C6>SO>

05D;0VA,6A%0

C,OS0 -& S%A>% e'ists there ill e to o+ened cursors.

Close oth the cursors at that +oint. Set the &lag toindicate no cursors are availale.

0:0C S/,

C,OS0 file'>O)2,;C:*SO*

05D;0:0C

0:0C S/,

C,OS0 file'>STA*T>*%>C:*SO*

05D;0:0C

MOV0 * %O file'>C:*SO* .

3.1.3.1.2 STRT )O'S "OT '(!ST

%his section s+eci&ies the translation strategy &or VSAM &iles ith inde'ed organi% is not used.

De&ine a cursor &or each VSAM &ile to select all the ros in the corres+onding tale O>D0> B? +rimary

ey columns.


OP05;C6>SO>

1


14/63



OP05 O+en the cursor file'>O)2,>C:*SO* . 0:0C S/,

OP05 file'>O)2,;

C:*SO*05D;0:0C.

>0AD or

>0AD50:%

-n se8uential access &iles >0AD 50:% is same as

>0AD. Both o& them are se8uential read. )0%C@the cursor de&ined on the corres+onding tale.

Se8uential;>ead;OP05;C6>SO>

C,OS0 Close the o+ened cursor. 0:0C S/,C,OS0 file'>O)2,;

C:*SO*

05D;0:0C

3.1.3.2 !%O

3.1.3.2.1 STRT%'(!STS

%his section s+eci&ies the translation strategy &or VSAM &iles ith inde'ed organi% is used.

De&ine a cursor &or each VSAM &ile to select all the ros in the corres+onding tale.

-& start is used and i& start uses &ull record ey in ey com+arison de&ine a cursor to select all the ros inthe corres+onding tales here ey columns have values greater than or e8ual to the record ey values.

De&ine the aove cursors to e O>D0> B? +rimary ey columns.

De&ine a condition name in the oring storage section to e set and reset y S%A>% and OP05

statements hen they o+en and close the cursor. %his condition name ill indicate the current o+ened

cursor to e used y other o+erations.


*1 file'>C:*SO* P-C $ VA,60 *."" file'>O)2, value 1.


=here H&ile1;OP05 ill e set hen the cursor corres+onding to OP05 is o+ened



OP05;C6>SO>


S%A>%;C6>SO>


OP05 O+en the cursor file'>O)2,>C:*SO* .

%his ill select all the ros in the tale. Set

file'>O)2,>C:*SO* to e the current

valid cursor hich can then e used ysuccessive -9O o+erations till S%A>%

re+ositions the &ile +osition indicator or

C,OS0 closes the &ile.

0:0C S/,

OP05 file'>O)2,>C:*SO*

05D;0:0C.


S%A>% Start re+ositions the &ile +osition indicator

y +o+ulating record ey &ields itha++ro+riate values. -& the corres+onding

cursor is already o+ened close the cursor

and o+en it again. >eo+ening the cursor ill

-) H&ile1;S%A>%;>I

%@050:0C S/,

C,OS0 file'>STA*T>*%>

C:*SO*

1#


15/63


select the ros ased on the current value o&

the host variales used in the =@0>0

clause. Set H&ile1;S%A>%;>I;C6>SO> to

e the current valid cursor hich can eused y successive -9O o+erations till

another S%A>% re+ositions the &ile +osition

indicator or C,OS0 closes the &ile.

05D;0:0C

05D;-).

0:0C S/,

OP05 file'>STA*T>*%>C:*SO*

05D;0:0C.

MOV0 2 %O file'>C:*SO*"

>0AD -n se8uential access &iles >0AD 50:% is

same as >0AD. Both o& them are se8uential

read.

>0AD 9 >0AD 50:% can &ollo either anyone o& OP05 S%A>% or another

>0AD9>0AD 50:%.

-& S%A>% e'ists then cursor to &etch ill e

decided ased on the &lag hich states thecurrent valid cursor. COBO, 0VA,6A%0

statement ill e used to mae the decision.


=@05 file'>O)2,


=@05 file'>STA*T>*%Se8uential;>ead;S%A>%;C6>SO>

05D;0VA,6A%0


=>-%0 -nsert the ne ros into res+ective tales. -nsert

D0,0%0 Delete

C,OS0 As there ill e to o+ened cursors one y

the OP05 statement and another y S%A>%

statement oth the cursors ill e closed at

this +oint.

0:0C S/,

C,OS0 file'>O)2,>C:*SO*

05D;0:0C

0:0C S/,C,OS0 file'>STA*T>*%>

C:*SO*

05D;0:0CMOV0 * %O file'>C:*SO*

3.1.3.2.2 STRT+)O'S "OT '(!ST

%his section s+eci&ies the translation strategy &or VSAM &iles ith inde'ed organi% is not used.

De&ine a cursor &or each VSAM &ile to select all the ros in the corres+onding tale O>D0> B? +rimary

ey columns.



OP05;C6>SO>


OP05 O+en the cursor de&ined &or the

corres+onding &ile.

0:0C S/,

OP05 file'>O)2,>C:*SO*

05D;0:0C.

>0AD -n se8uential access &iles >0AD 50:% is

same as >0AD. Both o& them are se8uentialread.

>0AD 9 >0AD 50:% can &ollo either any

one o& OP05 S%A>% or another

>0AD9>0AD 50:%. )etch the file'>O)2,>C:*SO*.



=>-%0 -nsert ne ros into res+ective tales. -nsert

1!


16/63


D0,0%0 Delete

C,OS0 Close the cursor o+ened corres+onding to

the OP05 statement.

0:0C S/,

C,OS0 file'>O)2,>C:*SO*

05D;0:0C

3.1.3.3 O$T#$T & '(T'")

-n this mode there ill e no >0AD 9 >0AD 50:% 9 S%A>% statements. Only alloed o+erations areOP05 =>-%0 and C,OS0.


OP05 Comment OP05 statement. 5one

=>-%0 -nsert the ne ro into the corres+onding

tale.Multi+le -5S0>%

-nsert

C,OS0 Comment C,OS0 statement 5one

3.1., !nde*ed Organization Random ccess

All the -9O o+erations in a &ile ith inde' organi0 condition.

3.1.,.1 !"#$T


OP05 Comment the OP05 statement. 5one

>0AD Select the record ith +rimary ey

columns having values e8ual to record ey

values.

>andom;>ead

C,OS0 Comment the C,OS0 statement 5one

3.1.,.2 !%O


OP05 Comment the OP05 statement 5one

>0AD Select the ro ith +rimary ey columns

having values e8ual to record ey values.

>andom;>ead

>0=>-%0 6+date the ro ith +rimary ey columns

having values e8ual to record ey values.Multi+le 6PDA%0

>andom;>erite

-5S0>% -nsert the ne ro into the tale

corres+onding to the &ile.

-nsert

D0,0%0 Delete the ro ith +rimary ey columnshaving values e8ual to record ey values.

Delete

C,OS0 Comment C,OS0 statement. 5one

3.1.,.3 O$T#$T

O5era()*' "ecr)5()*' Tra'a(e C*eOP05 Comment the OP05 statement 5one

=>-%0 -nsert the ne ro into the tale

corres+onding to the &ile.

-nsert

C,OS0 Comment the C,OS0 statement 5one

3.1.- !nde*ed Organization )namic ccess

-9O o+erations in &iles ith inde'ed organi


17/63


re+ositioned using S%A>% or random >0AD. >ecords can e read se8uentially using >0AD 50:% and

randomly using >A5DOM >0AD.

%ranslation strategy varies ased on the e'istence o& S%A>% >0AD and >0AD 50:%. )ile +osition

indicator can e re+ositioned using either random >0AD or S%A>%.

)or &iles o+ened in -5P6% or -;O mode &ile -9O o+erations can e se8uential or random or oth ased on

the e'istence o& >0AD 50:% >A5DOM >0AD and S%A>%.)olloing are si' +ossile cases classi&ying the &ile o+eration to e se8uential or random or oth ased onthe e'istence o& >0AD 50:% >A5DOM >0AD and S%A>%.

S.N*. REA"

NE!T

RAN"OM REA" START O5era()*'

1 ?es 5o 5o Se8uential

2 ?es ?es 5o Se8uential and >andom

3 ?es 5o ?es Se8uential and >andom

( ?es ?es ?es Se8uential and >andom

5o ?es ?es >andom

# 5o ?es 5o >andom

/uery translation &or

Case 1 is same as &or &iles ith inde'ed organi


18/63


OP05 O+en the cursor file'>O)2,>C:*SO* . 0:0C S/,

OP05 file'>O)2,>

C:*SO*

05D;0:0C.MOV0 1 %O file'>C:*SO*.

>A5DOM

>0AD

>A5DOM >0AD translates to S0,0C% ith

=@0>0 clause. As >A5DOM >0ADre+ositions the &ile +osition indicator any+reviously o+ened cursor should e closed to

+revent o+erations &olloing >A5DOM >0AD

&rom using the cursor.

>andom;>ead

0VA,6A%0 file'>C:*SO*=@05 file'>O)2,0:0C S/,

C,OS0 file'>O)2,>

C:*SO*

05D;0:0C=@05 file'>*2A>*%

0:0C S/,

C,OS0 file'>*2A>*%>

C:*SO*05D;0:0C

05D;0VA,6A%0

MOV0 * %O file'>C:*SO*

>0AD50:%

>0AD 50:% is a se8uential o+eration andshould &ollo success&ul OP05 or >A5DOM

>0AD or >0AD 50:%.

-& the +revious o+eration is OP05 then that

ould have o+ened the a++ro+riate cursor andhence )0%C@ on the cursor corres+onding to

OP05 ill get the correct ro.

-& the +revious o+eration is >A5DOM >0AD

then that ould have selected the correct record.>ecord ey &ieldsE host variales F ould have

got +rimary ey column values o& the selected

record. O+ening the cursor file'>*2A>*%>

C:*SO* ill select all the ros in thecorres+onding tale ith +rimary ey columns

have values greater than record ey values and)0%C@ on that cursor ill get the correct

record.-& the +revious o+eration is >0AD 50:% it

ould have o+ened the a++ro+riate cursor and

hence &etch on that cursor ill get the correctrecord.

0VA,6A%0 file'>C:*SO*=@05 file'>O)2,


C6>SO>

=@05 file'>*2A>*%Se8uential;>ead;>0AD;

C6>SO>

=@05 *

0:0C S/,OP05 file'>*2A>*%;

C:*SO*.

05D;0:0C

Se8uential;>ead;>0AD;C6>SO>MOV0 2 %O file'>C:*SO*

05D;0VA,6A%0

C,OS0 Close the o+ened cursors. -) file'>O)2,>C:*SO*

%@05

0:0C S/,

C,OS0 file'>O)2,;C6>SO>

05D;0:0C

05D;-).-) file'>*2A>*%>C:*SO*%@05

0:0C S/,

C,OS0 file'>*2A>*%;

C:*SO*05D;0:0C

05D;-).

2*


19/63


3.1.-.1.2 /ase ,

%his section s+eci&ies the translation strategy &or VSAM &iles ith inde'ed organi0AD e'ists >A5DOM >0AD e'ists and S%A>% e'ists.


-& >A5DOM >0AD is used and i& it uses record ey in ey com+arison de&ine a cursor to select all the

ros in the corres+onding tale here ey columns have values greater than the record ey values.

-& S%A>% is used and i& it uses record ey in ey com+arison de&ine a cursor to select all the ros in thecorres+onding tale here ey columns have values greater than or e8ual to the record ey values.


De&ine a condition name in the oring storage section to e set and reset y >A5DOM >0AD S%A>%

and OP05 statements hen they o+en and close the cursor. %his condition name ill indicate the current

o+ened cursor to e used y other o+erations.

De&inition o& the condition name ill e*1 file'>C:*SO* P-C $ VA,60 *.

"" file'>O)2, value 1.

"" file'>*2A>*% value 2.


=here file'>O)2,ill e set hen the cursor corres+onding to OP05 is o+enedfile'>*2A>*%ill e set hen the cursor corres+onding to >0AD is o+ened



OP05;C6>SO>


S%A>%;C6>SO>

Cursor definition for *2A @

>0AD;C6>SO>


OP05 O+en the cursor de&ined corres+onding to OP05statement.

0:0C S/,OP05 file'>O)2,;

C:*SO*

05D;0:0C.

MOV0 1 %O file'>C:*SO*.

S%A>% Start re+ositions the &ile +osition indicator y

+o+ulating record ey &ields ith a++ro+riate

values.

-& the corres+onding cursor is already o+enedclose the cursor and o+en it again. >eo+ening

the cursor ill select the ros ased on the

current value o& the host variales used in the=@0>0 clause. Set H&ile1;S%A>%;>I;C6>SO> to e the current valid cursor hich

can e used y successive -9O o+erations till

another S%A>%9>A5DOM >0AD re+ositions

the &ile +osition indicator or C,OS0 closes the&ile.

-) H&ile1;S%A>%;>I

%@05

0:0C S/,


05D;0:0C

05D;-).0:0C S/,OP05 file'>STA*T>*%>

C:*SO*

05D;0:0C.


>A5DOM

>0AD


=@0>0 clause. As >A5DOM >0AD

>andom;>ead


21


20/63


re+ositions the &ile +osition indicator any

+reviously o+ened cursor should e closed to

+revent o+erations &olloing >A5DOM >0AD


=@05 file'>O)2,

0:0C S/,

C,OS0 file'>O)2,;

C:*SO*05D;0:0C

=@05 file'>*2A>*%

0:0C S/,C,OS0 file'>*2A>*%;C:*SO*

05D;0:0C

=@05 file'>STA*T>*%


C:*SO*

05D;0:0C

05D;0VA,6A%0MOV0 * %O file'>C:*SO*

>0AD

50:%

>0AD 50:% is a se8uential o+eration and

should &ollo either success&ul OP05 or

>A5DOM >0AD or >0AD 50:% or S%A>%.-& the +revious o+eration is OP05 or S%A>%

then that ould have o+ened the a++ro+riate

cursor and hence )0%C@ on the cursor

corres+onding to OP05 or S%A>% ill get thecorrect ro.

-& the +revious o+eration is >A5DOM >0AD

then that ould have selected the correct record.

>ecord ey &ieldsE host variales F ould havegot +rimary ey column values o& the selected

record. O+ening the cursor file'>*2A>*%>

C:*SO* ill select all the ros in the

corres+onding tale ith +rimary ey columnshave values greater than or e8ual to record ey

values and )0%C@ on that cursor ill get thecorrect record.

-& the +revious o+eration is >0AD 50:% itould have o+ened the a++ro+riate cursor and

hence on that cursor ill get the correct record.


=@05 file'>O)2,


=@05 file'>*2A>*%

Se8uential;>ead;>0AD;

C6>SO>=@05 file'>STA*T>*%

Se8uential;>ead;S%A>%;

C6>SO>

=@05 *0:0C S/,

OP05 file'>*2A>*%;

C:*SO*"

05D;0:0CSe8uential;>ead;>0AD;C6>SO>

MOV0 2 %O file'>C:*SO*05D;0VA,6A%0

C,OS0 Close the o+ened cursors. Set the &lag to indicatethat there are no cursors availale.

-) file'>O)2,>C:*SO*%@05

0:0C S/,

C,OS0 file'>O)2,;

C:*SO*05D;0:0C

05D;-).

-) file'>*2A>*%>C:*SO*

%@050:0C S/,

C,OS0 file'>*2A>*%;

C:*SO*

05D;0:0C05D;-).

-) file'>STA*T>*%>C:*SO*

%@05


22


21/63


C:*SO*

05D;0:0C

05D;-).


3.1.-.2 !%O

3.1.-.2.1 /ase 2

%his section s+eci&ies the translation strategy &or VSAM &iles ith inde'ed organi0AD e'ists >A5DOM >0AD e'ists and S%A>% does not e'ist.



ros in the corres+onding tale here ey columns have values greater than record ey values.


De&ine a condition name in the oring storage section to e set and reset y >A5DOM >0AD andOP05 statements hen they o+en and close the cursor. %his condition name ill indicate the current

o+ened cursor to e used y other o+erations.


*1 file'>C:*SO* P-C $ VA,60 *."" file'>O)2, value 1.

"" file'>*2A>*% value 2.

=here file'>O)2,ill e set hen the cursor corres+onding to OP05 is o+ened

H&ile2;>0AD;>I ill e set hen the cursor corres+onding to >0AD is o+ened.


OP05;C6>SO>

Cursor definition for *2A @

>0AD;C6>SO>


OP05 O+en the cursor file'>O)2,>C:*SO* de&ined corres+onding to OP05 statement.

0:0C S/,OP05 file'>O)2,;

C:*SO*

05D;0:0C.


>A5DOM

>0AD


=@0>0 clause. As >A5DOM >0AD

re+ositions the &ile +osition indicator any

+reviously o+ened cursor should e closed to+revent o+erations &olloing >A5DOM >0AD


>andom;>ead


=@05 file'>O)2,

0:0C S/,C,OS0 file'>O)2,;

C:*SO*

05D;0:0C=@05 file'>*2A>*%

0:0C S/,

C,OS0 file'>*2A>*%;

C:*SO*05D;0:0C

05D;0VA,6A%0

23


22/63



>0AD

50:%


should &ollo success&ul OP05 or >A5DOM

>0AD or >0AD 50:%.-& the +revious o+eration is OP05 then that


hence )0%C@ on the cursor corres+onding toOP05 ill get the correct ro.-& the +revious o+eration is >A5DOM >0AD


>ecord ey &ieldsE host variales F ould have

got +rimary ey column values o& the selectedrecord. O+ening the cursor file'>*2A>*%>


corres+onding tale ith +rimary ey columns

have values greater than record ey values and)0%C@ on that cursor ill get the correct

record.

-& the +revious o+eration is >0AD 50:% it

ould have o+ened the a++ro+riate cursor andhence &etch on that cursor ill get the correct

record.


=@05 file'>O)2,


=@05 file'>*2A>*%

Se8uential;>ead;>0AD;C6>SO>=@05 *

0:0C S/,

OP05 file'>*2A>*%;

C:*SO*.05D;0:0C

Se8uential;>ead;>0AD;C6>SO>

MOV0 2 %O file'>C:*SO*

05D;0VA,6A%0

>0=>-%0 >ecord to e reritten is s+eci&ied y the value

contained in the +rime >0CO>D I0?.>0=>-%0 ill translate to 6PDA%0 ith

=@0>0 clause.

>andom;>erite

D0,0%0 >ecord to e deleted is s+eci&ied y the value

contained in the +rime >0CO>D I0?.D0,0%0 ill translate to D0,0%0 ith

=@0>0 clause.

Delete

=>-%0 >ecord to e ritten is s+eci&ied y the value

contained in the +rime >0CO>D I0?. =>-%0ill translate to -5S0>% ith =@0>0 clause.

-nsert

C,OS0 Close the o+ened cursors. Set the &lag to indicatethat there are no cursors availale.

-) file'>O)2,>C:*SO*%@05

0:0C S/,C,OS0 file'>O)2,;

C:*SO*

05D;0:0C

05D;-).-) file'>*2A>*%>C:*SO*

%@05

0:0C S/,

C,OS0 file'>*2A>*%;C:*SO*

05D;0:0C

05D;-).MOV0 * %O file'>C:*SO*

3.1.-.2.1 /ase ,



ros in the corres+onding tale here ey columns have values greater than record ey values.

2(


23/63


24/63


05D;0:0C

=@05 file'>STA*T>*%

0:0C S/,


05D;0:0C

05D;0VA,6A%0MOV0 * %O file'>C:*SO*

>0AD

50:%


should &ollo either success&ul OP05 or

>A5DOM >0AD or >0AD 50:% or S%A>%.

-& the +revious o+eration is OP05 or S%A>%then that ould have o+ened the a++ro+riate

cursor and hence )0%C@ on the cursor

corres+onding to OP05 or S%A>% ill get the

correct ro.-& the +revious o+eration is >A5DOM >0AD


>ecord ey &ieldsE host variales F ould have

got +rimary ey column values o& the selectedrecord. O+ening the cursor file'>*2A>*%>


corres+onding tale ith +rimary ey columns

have values greater than record ey values and)0%C@ on that cursor ill get the correct record.

-& the +revious o+eration is >0AD 50:% it


hence &etch on that cursor ill get the correctrecord.


=@05 file'>O)2,


C6>SO>=@05 file'>*2A>*%

Se8uential;>ead;>0AD;

C6>SO>

=@05 file'>STA*T>*%Se8uential;>ead;S%A>%;

C6>SO>

=@05 *

0:0C S/,OP05 file'>*2A>*%;

C:*SO*"

05D;0:0C

Se8uential;>ead;>0AD;C6>SO>MOV0 2 %O file'>C:*SO*

05D;0VA,6A%0

>0=>-%

0

>ecord to e reritten is s+eci&ied y the value

contained in the +rime >0CO>D I0?.

>0=>-%0 ill translate to 6PDA%0 ith=@0>0 clause.

>andom;>erite

D0,0%0 >ecord to e deleted is s+eci&ied y the valuecontained in the +rime >0CO>D I0?. D0,0%0

ill translate to D0,0%0 ith =@0>0 clause.

Delete

=>-%0 >ecord to e ritten is s+eci&ied y the value

contained in the +rime >0CO>D I0?. =>-%0

ill translate to -5S0>% ith =@0>0 clause.

-nsert

C,OS0 Close the o+ened cursors. -) file'>O)2,>C:*SO*%@05

0:0C S/,

C,OS0 file'>O)2,;

C:*SO*05D;0:0C

05D;-).

-) file'>*2A>*%>C:*SO*%@050:0C S/,

C,OS0 file'>*2A>*%>

C:*SO*

05D;0:0C05D;-).

-) file'>STA*T>*%>C:*SO*

%@05

2#


25/63


0:0C S/,

C,OS0 file'>STA*T>*%>

C:*SO*

05D;0:0C05D;-).


3.1.0.3 O$T#$T

-n this mode there ill e no >0AD 9 >0AD 50:% 9 S%A>% statements. Only alloed o+erations are

OP05 =>-%0 and C,OS0.


OP05 Comment OP05 statement. 5one

=>-%0 -nsert the record into the corres+onding

tale.

-nsert

C,OS0 Comment C,OS0 statement 5one

2!


26/63


3.2 Online Program Translation

0ach original +rogram ith emedded VSAM access call is assumed to have &olloing tem+late structure.

%em+late also identi&ies some record structures that ill e added to the oring storage section o& the

+rogram.

-D05%-)-CA%-O5 D-V-S-O5.

P>O7>AM;-D. Cics+rgm.

05V->O5M05% D-V-S-O5.

DA%A D-V-S-O5.

=O>I-57;S%O>A70 S0C%-O5.

*1 DA%A;>0CO>D.

* DA%A;)-0,D;1 J.

* DA%A;)-0,D;2 J..

.

*1 I0?;>0CO>D.

* I0?;)-0,D;1 J.

* I0?;)-0,D;2 J.

*1 DA%A;>0C;,057%@J.

1 I0?;>0C;,057%@J.

1 %OI05;)-0,DJ.

1 >0/-D;)-,0DJ1 CO65%;)-0,DJ

*1 56M0>-C;CO65%J

KKKK record structures elo needs to e added in the ne code KKKK

1 DC,705;>0CO>D.

DC,705;I0?.

1* DC,705;I0?;)-0,D11* DC,705;I0?;)-0,D2

.

.

DC,705;DA%A.1* DC,705;DA%A;)-0,D1

1* DC,705;DA%A;)-0,D2

.

.

9K this de&inition needs to e re+eated a++ro+riately K9

9K &or each %OI05 used in +rogram K9*1 %OI05;DC,705;I0?.

%OI05;DC,705;I0?;)-0,D1

%OI05;DC,705;I0?;)-0,D2

.

.

2"


27/63


9K-ndicator to identi&y i& the cursor is de&ined &or a >0AD50:% or >0ADP>0V o+eration K9

*1 =S;)65C%-O5;C6>SO> P-C :E*1F VA,60 .

"" =S;50:%;C6>SO> VA,60 5."" =S;P>0V;C6>SO> VA,60 P.

"" =S;5O;C6>SO> VA,60 .

9K this de&inition needs to e re+eated a++ro+riately &or each >0S0%B> on a VSAM &ile using di&&erentrose criteria K9

*1 =S;)65C%-O5;C6>SO>;1 P-C :E*1F VA,60 .

"" =S;50:%;C6>SO>;1 VA,60 5."" =S;P>0V;C6>SO>;1 VA,60 P.

"" =S;5O;C6>SO>;1 VA,60 .

KKKK 0nd o& the ne addition KKKK

P>OC0D6>0 D-V-S-O5.

.

.0:0C C-CS

Vsam access call

05D;0:0C.

.

.

Discussion elo ill assume this +rogram tem+late and ill identi&y necessary changes to the code

corres+onding to translation o& each command.

2$


28/63


29/63


30/63


-) E >0AD is &or 6PDA%0 F

L

9K i& toen is s+eci&ied e'+licitly in +rogram &ind a++ro+riate %OI05;DC,705;I0? K99K corres+ondingly. K9

MOV0 DC,705;I0? to %OI05;DC,705;I0?

3.2.2 STRTR

3.2.2.1 unction

Start rose o& a &ile. %his is used to +osition the &ile +osition indicator at the desired record so thatVSAM read can e done &rom this record onards.

3.2.2.2 /!/S Snta*

0:0C C-CS

S%A>%B>

)-,0 E VSAM;)-,05AM0 F M &ile to e read

>-D),D E I0?;>0CO>DF M ey record need to e +o+ulatede&ore call

I0?,057%@ E I0?;>0C;,057%@F O no o& +osition o& ey to e matched

&or +artial9generic search E

mandatory hen generic o+tion iss+eci&iedF

7050>-C O +artial ey match

7%0/ 9 0/6A, O match ey &or 08ual or 7reaterthan or 08ual condition

>BA O hen this o+tion is s+eci&ied

>-D),D contains actual relativeyte address

>>5 O hen this o+tion is s+eci&ied

>-D),D contains actual >elative>ecord 5umer

>0/-D E >0/-D;)-0,D F O used to identi&y is there are more

than one rose on same &ile

05D;0:0C

&"!"!"& Translation of S#nta$

.

.

-) E >0/-D;)-0,D is s+eci&ied F

L

32


31/63


32/63


33/63


34/63


3.2.3.3 Translation of Snta*

=O* *2A,24T COMMA,

-) =S;50:%;C6>SO>E 0:0C S/,

)0%C@ 50:%;C6>SO>5AM0

-5%O 4DC,705;>0CO>D

05D;0:0CF

0,S0

-) =S;P>0V;C6>SO>

E0:0C S/,

C,OS0 P>0V;C6>SO>5AM0

05D;0:0C

Move the VSAM ey values to the dclgen;record &ields to use in the =@0>0 clauseS0% =S;50:%;C6>SO> %O %>60

0:0C S/,

OP05 50:%;C6>SO>5AM005D;0:0C

0:0C S/,

)0%C@ 50:%;C6>SO>5AM0-5%O 4DC,705;>0CO>D

05D;0:0C

F

05D;-)

K this logic is to tae care o& the >0S0%B> done on the &ile ith di&&erent criteria than the S%A>%B>

-) =S;50:%;C6>SO>;1E 0:0C S/,

)0%C@ 50:%;C6>SO>5AM0 ;1

-5%O 4DC,705;>0CO>D

05D;0:0CF

0,S0

-) =S;P>0V;C6>SO>;1

E0:0C S/,

C,OS0 P>0V;C6>SO>5AM0;1

05D;0:0C

Move the VSAM ey values to the dclgen;record &ields to use in the =@0>0 clause

S0% =S;50:%;C6>SO> %O %>60

0:0C S/,OP05 50:%;C6>SO>5AM0;1

05D;0:0C

0:0C S/,)0%C@ 50:%;C6>SO>5AM0;1

3#


35/63


-5%O 4DC,705;>0CO>D

05D;0:0C

F

05D;-)

=O* *2A)*2V COMMA,

-) =S;P>0V;C6>SO>

E 0:0C S/,

)0%C@ P>0V;C6>SO>5AM0

-5%O 4DC,705;>0CO>D05D;0:0C

F

0,S0

-) =S;50:%;C6>SO>E

0:0C S/,

C,OS0 50:%;C6>SO>5AM0

05D;0:0C


S0% =S;P>0V;C6>SO>;1 %O %>60

0:0C S/,OP05 P>0V;C6>SO>5AM0

05D;0:0C

0:0C S/,)0%C@ P>0V;C6>SO>5AM0

-5%O 4DC,705;>0CO>D

05D;0:0C

F05D;-)

K this logic is to tae care o& the >0S0%B> done on the &ile ith di&&erent criteria than the S%A>%B>

-) =S;P>0V;C6>SO>;1

E 0:0C S/,

)0%C@ P>0V;C6>SO>5AM0;1

-5%O 4DC,705;>0CO>D05D;0:0C

F

0,S0

-) =S;50:%;C6>SO>;1E

0:0C S/,

C,OS0 50:%;C6>SO>5AM0;105D;0:0C


S0% =S;P>0V;C6>SO>;1 %O %>60

0:0C S/,OP05 P>0V;C6>SO>5AM0;1

05D;0:0C

0:0C S/,

3!


36/63


)0%C@ P>0V;C6>SO>5AM0;1

-5%O 4DC,705;>0CO>D

05D;0:0C

F05D;-)

MOV0 DC,705;>0CO>D %O DA%A;>0CO>D..

.

3"


37/63


3.2., 4R!T'

3.2.,.1 unction

=rite a record using the ey values s+eci&ied.

3.2.,.2 /!/S Snta*

0:0C C-CS

=>-%0

)-,0 E vsam;&ilename F M &ile to e read

)>OM E DA%A;>0CO>D F M data area &rom here to recordneeds to e ritten

,057%@ E DA%A;>0C;,057%@F O length o& data record to e ritten

>-D),D E I0?;>0CO>DF M ey record need to e +o+ulated

e&ore call

I0?,057%@ E I0?;>0C;,057%@F O generally this is s+eci&ied as lengtho& com+lete ey &ield


>-D),D contains actual relative

yte address>>5 O hen this o+tion is s+eci&ied

>-D),D contains actual >elative

>ecord 5umer

05D;0:0C

3.2.,.3 Translation of Snta*

.

.

MOV0 DA%A;>0CO>D %O DC,705;>0CO>D.

0:0C S/,

-5S0>% -5%O L d2;talename corres+onding to vsam;&ilename VA,60S A>0 L 4DC,705;>0CO>D &ields

05D;0:0C

3$


38/63


3.2.- R'4R!T'

3.2.-.1 unction

6+date a record in a &ile &or the ey values s+eci&ied. >0=>-%0 can e done a&ter e'ecuting a >0AD )O>

6PDA%0 or it can e a random >0=>-%0 also.

3.2.-.2 /!/S Snta*

0:0C C-CS

>0=>-%0


)>OM E DA%A;>0CO>D F M data area &rom here to record

needs to e ritten

,057%@ E DA%A;>0C;,057%@F O length o& data record to e reritten

%OI05 E %OI05;)-0,D F O used to identi&y multi+le records

read &or 6PDA%09>0=>-%005D;0:0C

3.2.-.3 Translation of Snta*

.

.

MOV0 DA%A;>0CO>D %O DC,705;>0CO>D

-& E toen is e'+licitly s+eci&ied in command

L

use it to identi&y corres+onding %OI05;DC,705;I0?

hich can e used in here clause

0:0C S/,

6PDA%0 L d2;talename corres+onding to vsam;&ilename S0% d2;column;names 4DC,705;>0CO>D &ields

=@0>0 d2;column;names 4%OI05;DC,705;I0? or DC,705;>0CO>D;I0?

05D;0:0C

.

(*


39/63


3.2.0 )'5'T'

&"!"8"' =unction

Delete a record &rom a &ile

3.2.0.2 /!/S Snta*

0:0C C-CS

D0,0%0

)-,0 E vsam;&ilename F M &ile &or delete

>-D),D E I0?;>0CO>DF O ey record need to e +o+ulatede&ore call

I0?,057%@ E I0?;>0C;,057%@F O no o& +osition o& ey to e matched&or +artial9generic match E

mandatory hen generic o+tion is

s+eci&iedF



>-D),D contains actual relative

yte address


>-D),D contains actual >elative

>ecord 5umer

%OI05 E %OI05;)-0,D F O used to identi&y record to e

deleted hich as identi&ied y

read &or 6PDA%09>0=>-%056M0>-C E 56M0>-C;CO65% F O %his variale is +o+ulated ith

numer o& records deleted

05D;0:0C

3.2.0.3 Translation Of Snta*

-) E %oen is S+eci&ied F

LMOV0 %OI05;DC,705;I0? %O DC,705;I0?.

-) E >-D),D is s+eci&ied FL

MOV0 I0?;>0CO>D to DC,705;I0? N

(1


40/63


-& E I0?,057%@ is s+eci&ied F

L

identi&y e'act &ields &rom I0?;>0CO>DNcorres+onding to these &ields identi&y DC,705;I0? &ields

else

Lall &ields o& DC,705;I0? ill +artici+ate in =@0>0 clause

>elational O+erator is

using DB2 columnnames and corres+onding DC,705;I0? &ields as identi&ied e&ore and y using

relational o+erator &orm the =@0>0 clause N

0:0C S/,

D0,0%0 Ed2;talename corres+onding to vsam;&ilename F

=@0>0 E here clause as &ormated e&ore F05D;0:0C

MOV0 S/,0>>DE3F %O 56M0>-C;CO65%

(2


41/63


3.2.6 $"5O/7

3.2.6.1 unction

>elease e'clusive control o& the &ile. 65,OCI &ile is usually done a&ter a >0AD )O> 6PDA%0 is

e'ecuted on the &ile and it is decided that no u+date needs to e done to the record. 65,OCI also needs to

e +er&ormed a&ter VSAM MASS-5S0>%.

3.2.6.2 /!/S Snta*

0:0C C-CS

65,OCI

)-,0 E vsam;&ilename F M &ile to e unloced

%OI05 E %OI05;)-0,D F O 0'+licitly s+eci&ied >0AD &oru+date to e unloced

05D;0:0C

3.2.6.3 Translation of Snta*

5o S/, statement ill e added &or this ecause DB2 taes care o& data locing de+ending on theind o+tions used. Any resources loced ill e released a&ter a COMM-%.

Since the >0AD ith 6PDA%0 o+tion is eing translated to a S/, S0,0C% and the corres+onding

>0=>-%0 is eing translated to the an 6PDA%0 on the tale the scenario o& the )-,0 65,OCI does

not a++ear in the tale o+eration.

>e+lace this command ith initialiecords &or >0AD ith 6PDA%0.

-& s+eci&ic %OI05 is s+eci&ied then initiali


42/63


3.2.8 '")R

3.2.8.1 unction

0nd rose o& a &ile.

3.2.8.2 /!/S Snta*

0:0C C-CS

05DB>


>0/-D E >0/-D;)-0,D F O used to identi&y i& there are more

than one rose on same &ile05D;0:0C


-) E >0/-D;)-0,D is s+eci&ied F

L

use it in determining 50:%;C6>SO>5AM0 and P>0V;C6>SO>5AM0

-& E >0AD50:% o+eration e'istsF

L

0:0C S/,C,OS0 50:%;C6>SO>5AM0

05D;0:0C

else-& E >0ADP>0V o+erations e'ists F

L

0:0C S/,

C,OS0 P>0V;C6>SO>5AM005D;0:0C

((


43/63


3.2.9 R'S'TR

3.2.9.1 unction

>eset start o& rose. %he &ile +osition indicator is set to the +osition at the record ith the ne ey values

s+eci&ied.

3.2.9.2 /!/S Snta*

0:0C C-CS

>0S0%B>

)-,0 E VSAM;)-,05AM0 F M &ile to e read

>-D),D E I0?;>0CO>DF M ey record need to e +o+ulatede&ore call

I0?,057%@ E I0?;>0C;,057%@F O no o& +osition o& ey to e matched&or +artial9generic search E

mandatory hen generic o+tion iss+eci&iedF


7%0/ 9 0/6A, O match ey &or 08ual or 7reaterthan or 08ual condition


>-D),D contains actual relativeyte address


>-D),D contains actual >elative>ecord 5umer

>0/-D E >0/-D;)-0,D F O used to identi&y is there are more

than one rose on same &ile05D;0:0C


-) E >0/-D;)-0,D is s+eci&ied FL

use it in determining 50:%;C6>SO>5AM0 and P>0V;C6>SO>5AM0

Move the ey values s+eci&ied in the >0S0%B> to the DC,705 &ields.

C:*SO* 2CLA*ATIO,

%he >0S0%B> can use either the same criteria that the S%A>%B> used or it can reset the &ile +osition

indicator using some other criteria e'am+le the S%A>%B> may e having a 0/6A, condition ut the

(


44/63


>0S0%B> can use a 7%0/ condition. Veri&y i& the conditions s+eci&ied in the >0S0%B> is di&&erent than

in the S%A>%B>. -& the conditions are di&&erent then ne cursors ill have to e de&ined &or >0S0%B>

using the ne criteria.

-n case ne cursors have to e de&ined i& only >0AD50:% o+eration is +resent in the +rogram &or the

VSAM &ile then declare only the cursor &or readne't E50:%;C6>SO>5AM0F. -& only >0ADP>0V

o+eration is +resent in the +rogram &or a VSAM &ile then declare only the cursor &or read+rev EP>0V;

C6>SO>5AM0F. Both the cursors ill e declared i& >0ADP>0V and >0AD50:% is eing done on a&ile in the +rogram.

0:0C S/,

D0C,A>0 C6>SO> 50:%;C6>SO>5AM0;1 )O>S0,0C% K

)>OM L d2;talename corres+onding to vsam;&ilename

=@0>0 L a++ro+riate here clause ith tale&ields and o+erator

05D;0:0C

0:0C S/,

D0C,A>0 C6>SO> P>0V;C6>SO>5AM0;1 )O>

S0,0C% K

)>OM L d2;talename corres+onding to vsam;&ilename =@0>0 L a++ro+riate here clause ith tale&ields and H o+erator

05D;0:0C

*2)LACI,+ T(2 *2S2TB* COMMA,

-& =S;50:%;C6>SO>L

S0% =S;5O;C6>SO> %O %>60

0:0C S/,

C,OS0 50:%;C6>SO>5AM005D;0:0C

else

-& =S;P>0V;C6>SO>L

S0% =S;5O;C6>SO> %O %>60

0:0C S/,

C,OS0 P>0V;C6>SO>5AM005D;0:0C

.

-& =S;50:%;C6>SO>;1L

S0% =S;5O;C6>SO>;1 %O %>60

0:0C S/,C,OS0 50:%;C6>SO>5AM0;105D;0:0C

else

-& =S;P>0V;C6>SO>;1L

S0% =S;5O;C6>SO>;1 %O %>60

0:0C S/,C,OS0 P>0V;C6>SO>5AM0;1

(#


45/63


05D;0:0C

.

%he =@0>0 0:-S%S clause is used &irst to do a S0,0C% on the tale. -& any ros are &ound ith

matching condition then only the cursor is o+ened. )or this +ur+ose the Standard Dummy tale

S?S-BM.S?SD6MM?1 is used.%he translated code ill loo as given elo 4

0:0C S/, S0,0C% -BM>0/D )>OM S?S-BM.S?SD6MM?1

-5%O 4=S;-BM>0/D=@0>0 0:-S%S

ES0,0C% K )>OM d2;tale;name

=@0>0 d2;column;name For D G 4 dclgen;record &ieldsF

05D;0:0C.

(!


46/63


47/63


4 Otimi!ing "or Performance

4.1 Selecting only the require !iels

-t is +re&erred that the only the re8uired columns are selected in the 8uery.

4.2 Aing "ommit logic

Batch +rograms hich handle large volume o& data and do u+dates inserts or deletes on the DB2 tales illhave etter +er&ormance i& commit logic is added to commit the changes a&ter the numer o& ros

+rocessed reaches a +redetermined value. @oever &or any cursor o+erations &or hich the commit logic is

used should have the cursor de&ined ith o+tion =-%@ @O,D otherise the cursor +osition is lost a&ter

the commit.

4.3 #$ate only the require columns

Only columns re8uired to e u+dated should e retained in the u+date statements. %his is es+ecially true i&

the column is inde'ed and is eing u+dated unnecessarily.

($


48/63


# Aendi$

-.1.1 Sequential Read O#'"%/$RSOR

0:0C S/,)0%C@ file'>O)2,>C:*SO*

-5%O Hres+ective;&ields

05D;0:0C

-) S/,COD0 1**%@05

at>end>imperative>stmtsQ 50:% S05%05C0

0,S0

-) S/,COD0 *%@05

0:0C S/,

OP05 C6>SO>de+endant;cursor;1

05D;0:0CMOV0 1 %O db!>count

P0>)O>M)0%C@;PA>A;165%-, Hdb!>count Hdb!>arra#>'>si.e A5D

S/,COD0 1**

0:0C S/,C,OS0 C6>SO> de+endant;cursor;1

05D;0:0C

...

0:0C S/,OP05 C6>SO>de+endant;cursor;n

05D;0:0C

MOV0 1 %O db!>count

P0>)O>M)0%C@;PA>A;n65%-, Hdb!>count Hdb!>arra#>n>si.e A5DS/,COD0 1**

0:0C S/,

C,OS0 C6>SO> de+endant;cursor;n05D;0:0C

not>at>end>imperative>stmts

0,S0

D-SP,A? R 0>>O> -5 )0%C@ R05D;-)

05D;-).

*


49/63


-.1.2 Sequential Read STRT%/$RSOR

0:0C S/,

)0%C@ file'>STA*T>C:*SO*


05D;0:0C-) S/,COD0 1**

%@05


0,S0-) S/,COD0 *

%@05

0:0C S/,

OP05 C6>SO>de+endant;cursor;105D;0:0C

MOV0 1 %O db!>count

P0>)O>M)0%C@;PA>A;165%-, Hdb!>count Hdb!>arra#>'>si.e A5D

S/,COD0 1**


05D;0:0C

...0:0C S/,

OP05 C6>SO>de+endant;cursor;n

05D;0:0C

MOV0 1 %O db!>countMOV0 arra#>n>si.e%O B!>A**A;>n>SIH2

P0>)O>M)0%C@;PA>A;n65%-, Hdb!>countH Hdb!>arra#>n>si.e A5D

S/,COD0 1**

0:0C S/,C,OS0 C6>SO> de+endant;cursor;n

05D;0:0C


0,S0D-SP,A? R 0>>O> -5 )0%C@ R

05D;-)

05D;-).

1


50/63


-.1.3 Sequential Read R')%/$RSOR

0:0C S/,

)0%C@ file'>*2A>C:*SO*


05D;0:0C-) S/,COD0 1**

%@05


0,S0-) S/,COD0 *

%@05

0:0C S/,

OP05 C6>SO>de+endant;cursor;105D;0:0C

MOV0 1 %O db!>count

P0>)O>M)0%C@;PA>A;165%-, db!>count db!>arra#>'>si.e A5D

S/,COD0 1**


05D;0:0C

...0:0C S/,

OP05 C6>SO>de+endant;cursor;n

05D;0:0C

MOV0 1 %O db!>countP0>)O>M)0%C@;PA>A;n65%-, Hdb!>count Hdb!>arra#>n>si.e A5D

S/,COD0 1**

0:0C S/,

C,OS0 C6>SO> de+endant;cursor;n05D;0:0C


0,S0

D-SP,A? R 0>>O> -5 )0%C@ R05D;-)

05D;-).

2


51/63


-.1., Random Read

0:0C S/,S0,0C% table>'>col>'... table>'>col>n

...

table>n>col>'...table>n>col>n

)>OM table>'...table>n-5%O Hres+ective;&ields

05D;0:0C

-) S/,COD0 *

%@050:0C S/,

OP05 C6>SO> de+endant;cursor;1

05D;0:0C

MOV0 1 %O db!>countP0>)O>M)0%C@;PA>A;165%-, db!>count db!>arra#>'>si.e A5D S/,COD0

1**

0:0C S/,

C,OS0 C6>SO> de+endant;cursor;1

05D;0:0C...

0:0C S/,

OP05 C6>SO> de+endant;cursor;n05D;0:0C

MOV0 1 %O db!>count

P0>)O>M)0%C@;PA>A;n65%-, Hdb!>count Hdb!>arra#>n>si.e A5D S/,COD0 1**

0:0C S/,C,OS0 C6>SO> de+endant;cursor;n

05D;0:0C

not>invalid>?e#>imperative>stmts

0,S0invalid>?e#>imperative>statementsQ 50:% S05%05C0

05D;-).

3


52/63


-.1.- !nsert

0:0C S/,-5S0>% -5%O table>'Etable>'>col>'... table>'>col>nF

VA,60S EHres+ective;&ieldsF

05D;0:0C.

-) S/,COD0 *%@05

0:0C S/,

-5S0>% -5%O table>!Ftable>!>col>' """ table>!>col>nG

VA,60S EHres+ective;&ieldsF05D;0:0C

05D;-)

...

-) S/,COD0 *%@05

0:0C S/,

-5S0>% -5%O table>nEtable>n>col>'... table>n>col>nF

VA,60S EHres+ective;&ieldsF

05D;0:0C05D;-)

-) S/,COD0 *

%@05MOV0 1 %O db!>count

P0>)O>M-5S0>%;PA>A;165%-, db!>count db!>arra#>'>si.e A5D S/,COD0 *

...

MOV0 1 %O db!>countP0>)O>M-5S0>%;PA>A;n65%-, Hdb!>count Hdb!>arra#>n>si.e A5D S/,COD0 *

05D;-)

-) S/,COD0 *

%@05not>invalid>?e#>statementsQ 50:% S05%05C0

0,S0

invalid>?e#>statementsQ D-SP,A? R0rror -n -nsert R

05D;-)

(


53/63


54/63


05D;-)

-) S/,COD0 *

%@05

not>invalid>?e#>statementsQ 50:% S05%05C00,S0

invalid>?e#>statementsQ D-SP,A? R0rror -n 6+date R

05D;-)

#


55/63


-.1.6 )elete

0:0C S/,D0,0%0 table>'

=@0>0table>'>?e#>col>' table>'>?e#>col>'>?e#>fld>'

...

table>'>?e#>col>n D table>'>?e#>col>n>?e#>fld>n05D;0:0C.

-) S/,COD0 *

%@05

0:0C S/,D0,0%0 table>!

=@0>0table>!>?e#>col>' D table>!>?e#>col>'>?e#>fld>'

"""

table>!>?e#>col>n D table>!>?e#>col>n>?e#>fld>n05D;0:0C.

05D;-)

...

-) S/,COD0 *

%@05 0:0C S/,

D0,0%0 table>n

=@0>0table>n>?e#>col>' D table>n>?e#>col>'>?e#>fld>'"""

table>n>?e#>col>n D table>n>?e#>col>n>?e#>fld>n

05D;0:0C.

05D;-)-) S/,COD0 *

%@05

not>invalid>?e#>statementsQ 50:% S05%05C0

0,S0invalid>?e#>statementsQ D-SP,A? R0rror -n DeleteR

05D;-)

!


56/63


-.1.8 O#'"%/$RSOR

-& &ile organi0 file'>O)2,>C:*SO* C6>SO> )O>

S0,0C% table>'>col>'... table>'>col>n...


)>OM table>'...table>n05D;0:0C

-& &ile organiO)2,>C:*SO* C6>SO> )O>

S0,0C% table>'>col>'... table>'>col>n...


)>OM table>'...table>n

O>D0> B? table>'>?e#>col>'... table>'>?e#>col>n05D;0:0C

"


57/63


58/63


-.1.1; R')%/$RSOR

0:0C S/,D0C,A>0 Hfile'>*2A>*%>C:*SO*C6>SO> )O>

S0,0C% table>'>col>'... table>n>col>n

...

table>n>col>'...table>n>col>n)>OM table>'...table>n

=@0>0 table>'>?e#>col>' rec>?e#>fld>'

table>'>?e#>col>n rec>?e#>fld>n

table>!>?e#>col>n table>'>?e#>col>'table>!>?e#>col>n table>'>?e#>col>n

...

table>n>?e#>col>n table>'>?e#>col>'

table>n>?e#>col>n table>'>?e#>col>nO>D0> B? table>'>?e#>col>'... table>'>?e#&g

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VSAM to DB2 Conversion