AS/400 >> EMBEDDED SQL HELP

by iseriesflorida » Wed, 20 May 2009 21:10:50 GMT

I have a file(test) with lets say 7 records, I want the count(fieldA)
and the sum(fieldb). I then need to take the count from fieldA and
the sum from field(b) and put these values into a file, is this
possible?? If so could someone provide a small example.

I can define the file test as input specs but I am having problems
with count and sum part. I believe I will need to rename these fields
as well and my take is that I could do this with a simple insert once
all records were read.


AS/400 >> EMBEDDED SQL HELP

by iseriesflorida » Wed, 20 May 2009 22:12:35 GMT



This sql works:
select count(odobnm) as name, sum(odobsz) as size
from qtemp/jrnrcv

here is the ilerpg code that is not working:

H
FJRNRCV IF E DISK
D SIZE S 31 0
D NAME S 9 0
C/EXEC SQL SET OPTION COMMIT = *NONE
C/END-EXEC
c/exec sql
c+ declare mainCursor Cursor
c+ for
c+ select sum(odobsz) as size, count(odobnm) as name
c+ from qtemp/jrnrcv
c/end-exec
c/exec sql
c+ insert into bob/rmtboxinfo
C+ (NAME, SIZE)
C+ VALUES(:NAME, :SIZE)
c/end-exec
C EVAL *INLR = *ON
C RETURN

AS/400 >> EMBEDDED SQL HELP

by CRPence » Wed, 20 May 2009 22:31:57 GMT


If using SQL, there would be no F-spec [file /input specs/] nor
generally should there bei.e. SQL statements define the utilization
of the file, not the RPG statements. An exception is if\when the
file is declared for USROPN, with the intent only for reference as
DS; no open by RPG ever need take place. There is no reason to
/read/ the records, because the SQL has statements that insert data
without the program ever needing to /see/ any individual rows.

The simplest statement is to just create a TABLE as a result of
the SELECT. For example:

create table as
( select count(fieldA) as CountA
/* or use count(*), verify for sure which is desired */
, sum(fieldB) as SumB
) with data

If the table already exists then the same SELECT on an INSERT
INTO instead of the CREATE TABLE AS. For example:

insert into TheExistingTable
( select count(fieldA) as CountA
, sum(fieldB) as SumB
)

Regards, Chuck

AS/400 >> EMBEDDED SQL HELP

by CRPence » Thu, 21 May 2009 01:25:58 GMT


As noted in a prior reply, the F-spec is undesirable because its
inclusion without USROPN keyword will cause the file to be
implicitly opened by the RPG activation, even though there is no
READ activity for the program; i.e. the extra open is a pointless
and expensive.

Please note that ODOBSZ is deprecated due to its being too small
to represent larger object sizes. References to that field should
be replaced by the expression, (number of units * unit size); I do
not recall the field names.

The first statement produces a cursor result set for an OPEN, but
a FETCH would be required to read the rows; no OPEN nor FETCH is
code. There seems to be no reason to do so, however.

The second statement [INSERT INTO] wants to use variables but the
first does not SELECT INTO the variables, nor does a READ assign
them. Also the variable names are suspect, given the values in the
summary query are for size & count, but the variables in the insert
statement are size & name. A revised variation of the SELECT might
look like the following, if the desire is to use an insert with the
variables while avoiding cursor, open, and fetch:

select sum(odxxxunits*odxxxsizeu)
, count(odobnm)
into :size, :nbr
from qtemp/jrnrcv

Then the revised insert presumably could then be:

insert into bob/rmtboxinfo
values(:size, :nbr)

As in the prior reply, the SQL statements allow INSERT INTO
SELECT FROM or CREATE TABLE AS SELECT to avoid ever having to /read/
or /FETCH/ the data from the file into the program; i.e. just ask
the SQL to do everything.

Regards, Chuc

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