You can just put the where clause in the data statement using a sub select using the native SQL of the underlying database. The substitution will work there to and you avoid the translation step from MapServer expressions to native SQL. --Steve
________________________________________ From: mapserver-users [[email protected]] on behalf of [email protected] [[email protected]] Sent: Thursday, January 26, 2017 8:28 AM To: Lane, Michael Cc: '[email protected]' Subject: Re: [mapserver-users] Mapfile - filter by parameter - full scan How using (), [], "", '' is still a great mystery to me in filters. Every time I do many tries to got it right 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 : ----- A : "'[email protected]'" <[email protected]> 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 Direction des solutions d'affaires La Financière agricole du Québec 1400, boul. Guillaume-Couture Lévis (Québec) G6W 8K7 Tél. : 418 838-5614, poste 6034 [email protected]<mailto:[email protected]> [cid:[email protected]] [cid:[email protected]] [cid:[email protected]] _______________________________________________ mapserver-users mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/mapserver-users Si vous n'êtes pas le destinataire de ce message, veuillez le détruire près avoir informé l'expéditeur de son erreur. Par ailleurs, il est interdit de copier ou de modifier ce courriel sans l'autorisation de l'auteur. L'Institut national de santé publique du Québec n'assume aucune responsabilité à l'égard du contenu des messages personnels envoyés par ses employés.
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