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Am 17.02.2022 um 15:08 schrieb Birgitta Hauser <Hauser@xxxxxxxxxxxxxxx>:
I'd use static SQL:
Declare Cursor ...
Select ...
From ...
Where Field1 = Case When :Filter1 <> '' Then :Filter1 else Field1
And Field2 = Case When :Filter2 <> 0 Then :Filter2 Else Field2
And Field3 = Case When :Fillter3 > '2000-01-01' Then :Filter3
else Field3
... and so on
If no value is entered in the filter, Field = Field is performed, i.e.
everything is returned.
Mit freundlichen Grüßen / Best regards
Birgitta Hauser
"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"
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-----Original Message-----
From: RPG400-L <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Craig
Richards
Sent: Donnerstag, 17. Februar 2022 10:15
To: RPG programming on the IBM i (AS/400 and iSeries)
<rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: Embedded SQL and Parameter Markers
I'm building a few "Work With" screens with filters at the moment Fairly
typical maintenance programs where several of the columns shown in a subfile
have a "filter" field above them for refining the record selection.
Because the number of filters used is variable, I have traditionally created
dynamic SQL by building up a WHERE clause in a string and adding in any of
the filter fields which have been entered on the screen by the user.
I was wondering if there is a reasonable way to do this using parameter
markers.
Given that the number of filters entered is variable, so would the list of
parameter markers be.
To illustrate - I'm doing something like (simplified for brevity):
SqlStm = 'Select ... From ...';
If Filter1 <> *Blanks;
SqlWhere += 'and Field1 = Filter1'
EndIf;
If Filter2 <> *Blanks;
SqlWhere += 'and Field2 = Filter2'
EndIf;
If SqlWhere <> *Blanks;
SqlStm += SqlWhere;
EndIf;
etc.
In this simple example I could end up with:
- Select * from File
- Select *from File where Field1 = Value1
- Select *from File where Field2 = Value2
- Select *from File where Field1 = Value1 and Field2 = Value2
Is there a better way to build this dynamic sql?
Thanks in advance for any suggestions.
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