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One way that I avoid this whole issue is to put the results into a user
space mapped to a multiple occurrence data structure.
This not only solves the problem of loops because all the records are
read in one I/O but it increases performance significantly because all
the records are read at once and written to the user space at the
database level. IBM recommends where possible to use arrays.
Then you just read the multiple occurrence data structure in a loop.
Note this code use Qualified Data Structure so only works on V5R3M0 up.
Remove the qualification and it runs on anything.
Also, I am using my User Space API's. Again someone wants to use them,
send me an e-mail at alan0307d@xxxxxxxxxxxx The just wrap up all the
complexity of using User Spaces.
d cUserSpaceName...
d c 'TESTJVA3'
d cUserSpaceLibrary...
d c 'QTEMP'
d cText...
d c 'Hold records for processing.'
d dsRow...
d ds Occurs(32766)
d Based(ptrRow)
d Qualified
d ADDR1...
d 40a
d ADDR2...
d 40a
d CITY...
d 15a
d STATE...
d 3a
d ZIP...
d 10a
d RowCount...
d s Like(StdInt)
d Inz(0)
d x...
d s Like(StdInt)
/Free
ptrRow = CreateUserSpace(cUserSpaceName :
cUserSpaceLibrary :
%Size(dsRow) * 1000:
cText :
32 );
Exsr srSQL01; // Load all records into a user space.
If SqlCod <> 0;
Return;
EndIf;
For x = 1 to RowCount;
%Occur(dsRow) = x;
// Your code here to process results.
EndFor;
/End-Free
csr srSQL01 Begsr
c/Exec Sql
c+ Declare GasList Cursor For
c+ Select GSLADD1,
c+ GSLADD2,
c+ GSLCITY,
c+ GSLSTATE,
c+ GSLZIP
c+ From RTGASSP
c+ Where Length(Trim(GSLZIP)) = 5
c/End-Exec
c/Exec Sql
c+ Open GasList
c/End-Exec
c If SqlCod <> 0
c LeaveSr
c EndIf
c/Exec Sql
c+ Fetch From GasList For 32766 Rows Into :dsRow
c/End-Exec
c If SqlCod <> 0
c LeaveSr
c EndIf
c Eval RowCount = SQLERRD(3)
c/Exec Sql
c+ Close GasList
c/End-Exec
csr Endsr
p e
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- -
* CreateUserSpace
* Create User Space to hold records.
* Input - User Space Name.
* User Space Library.
* Size of User Space.
* Pages to transfer at a time.
* Out - None
* Returns - PointerToUserSpace.
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- -
p CreateUserSpace...
p b
d pi Like(StdPtr)
d InUserSpaceName...
d Like(StdNam)
d Value
d InUserSpaceLibrary...
d Like(StdNam)
d Value
d InUserSpaceSize...
d Like(StdInt)
d Value
d InText...
d Like(StdTxt)
d Value
d InTransferPages...
d Like(StdInt)
d Value
/copy *libl/qsrcf,xvuspc_pr
/Free
USPC_CreateUserSpace(InUserSpaceName :
InUserSpaceLibrary:
InUserSpaceSize :
cTrue :
InText :
'*ALL' :
'*YES' :
InTransferPages :
cTrue );
Return USPC_GetPointerToUserSpace(InUserSpaceName :
InUserSpaceLibrary);
/End-Free
p e
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