Your _expression_ seems to be ok so I don't know why you need extra ()
You can try without '' and [] like this
FILTER ((no_diag=%no_diag%) or (%no_diag% = 0))
Or try using processing instead of FILTER
PROCESSING 'NATIVE_FILTER=((%no_diag% = 0 OR no_diag=%no_diag%))'
Steve
-----"mapserver-users" <[email protected]> a écrit : -----
De : "Lane, Michael"
Envoyé par : "mapserver-users"
Date : 25/01/2017 16:13
Objet : [mapserver-users] Mapfile - filter by parameter - full scan
Hi,
Experiencing something not expected with the filter condition in mapfile.
I add this code in my mapFile to have the possibility to void the filter if no parameter is given:
VALIDATION
no_diag '^[0-9]{1,2}$'
default_no_diag '0'
END
DATA "geom_surf from LOCTS_PARC_AGRI_AN_COUR using srid 4326"
FILTER (([no_diag]='%no_diag%') or ('%no_diag%' = '0'))
I compare my execution time without parameter and it’s going to an execution time of 3 seconds before filter to one of 3 minutes with the filter.
After debugging, I realize that the « where clause » generated by MapServe were bad with the filter and that generate a full table scan :
WHERE ( '0' = '0' ) OR ( no_diag = '0' ) AND …
I was expecting something more like :
WHERE (( '0' = '0' ) OR ( no_diag = '0' )) AND …
So I had to add more parenthesis to the filter to get it correct
((('%no_diag%' = '0') or ([no_diag]='%no_diag%')))
Is it normal that I have to do that? The examples I found on the internet, have always single parenthesis. Do I code it right?
I use Mapserver 7 with database Oracle 12c. My parameter no_diag is a number.
Thanks
Michael Lane
Technicien en informatique
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