|
midrange.com
1) Declare multiple cursors like C1cursor, C2cursor, etc.
2) Evaluate using PREPARE and EXECUTE to build an 'on-the-fly' SQL
statement
3) Structure your SQL statement for maximum flexibility. In your example
let's pretend you had the following:
C SELECT
C WHEN CHOICE = 'A'
C/EXEC SQL
C+ Select COL1, COL2, COL3
C+ from TABLEA
C+ where COL4=:X
C/END-EXEC
C WHEN CHOICE='B'
C/EXEC SQL
C+ Select COL1, COL2, COL3
C+ from TABLEA
C+ where COL4 between :Y and :Z
C/END-EXEC
C WHEN CHOICE='C'
C/EXEC SQL
C+ Select COL1, COL2, COL3
C+ from TABLEA
C/END-EXEC
C ENDSL
Restructure this into:
C SELECT
C WHEN CHOICE = 'A'
C Eval Y=X
C Eval Z=X
C WHEN CHOICE='B'
C WHEN CHOICE='C'
C Eval Y=*loval
C Eval Z=*hival
C ENDSL
C/EXEC SQL
C+ Select COL1, COL2, COL3
C+ from TABLEA
C+ where COL4 between :Y and :Z
C/END-EXEC
In this case you would always use the BETWEEN instead of choosing. This
same technique has been used by SQL and OPNQRYF.
Rob Berendt
==================
Remember the Cole!
"Mike Naughton"
<mnaughton@juddwi To: RPG400-L@midrange.com
re.com> cc:
Sent by: Subject: Embedded SQL
owner-rpg400-l@mi
drange.com
12/11/00 12:52 PM
Please respond to
RPG400-L
I have been experimenting with embedded SQL, using Barbara's example
program as a guide (thanks, Barbara!). In general, it works great, but I'm
running into one problem that I can't seem to get around. If I only have
one "declare cursor" statement, I'm fine, but it I try to have more than
one
e.g.
C SELECT
C WHEN CHOICE = 'A'
C/EXEC SQL
C+ declare C1cursor for
C+ <some stuff here>
C/END-EXEC
C WHEN CHOICE='B'
C/EXEC SQL
C+ declare C1cursor for
C+ <other stuff here>
C/END-EXEC
C ENDSL
I get a compile error "cursor C1 already defined" for the second statement
(and all subsequent ones). I've tried IFs and SELECTs; I've tried putting
it in the main flow or off in a subroutine -- nothing seems to work!
Am I missing something?
Thanks!
Mike Naughton
Senior Programmer/Analyst
Judd Wire, Inc.
124 Turnpike Road
Turners Falls, MA 01376
413-863-4357 x444
mnaughton@juddwire.com
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