Re: SV: [mapserver-users] Classitems selection
Hi,
When you say that you could very well use expressions, do you mean
regular expressions? In my experience, unless you are working with a
very large data set they're fine.
E.g.
CLASSITEM flavour
...
EXPRESSION /cherry|mango|lime/
Christy
Lars Westerlind wrote:
AFAIK currently I write
CLASSITEM “flavor”
…
EXPRESSION “cherry”
Suggested extension would be to allow for
CLASSITEM
…
EXPRESSION “cherry”,”mango”,”lime”
But really, syntax is not my concern. A could very well use
expressions, but the documentation says they are not good for
performance. And my first question is if I’ve missed something?
*Från:* Fawcett, David [mailto:david.fawc...@state.mn.us]
*Skickat:* 13 August 2009 15:39
*Till:* Lars Westerlind; mapserver-users@lists.osgeo.org
*Ämne:* RE: [mapserver-users] Classitems selection
Do you mean something like ('[flavor]' IN ('cherry', 'mango', 'lime')?
-Original Message-
*From:* mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] *On Behalf Of
*Lars Westerlind
*Sent:* Thursday, August 13, 2009 2:39 AM
*To:* mapserver-users@lists.osgeo.org
*Subject:* [mapserver-users] Classitems selection
I use the CLASSITEM – EXPRESSION with string expression rather
much, which is also recommended for performance. But sometimes I
have a few values that could be shown in the same class. Wouldn’t
it be a nice idea to allow for a commaseparated set/list of
strings to match?
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Re: SV: [mapserver-users] Classitems selection
In that case you could use a regex for the classes with multiple
matches. (E.g. EXPRESSION /cherry|mango|lime/) Performance
penalty is not as large as for logical expressions and this is probably
faster than maintaining list.
Steve
On 8/13/2009 at 8:50 AM, in message
2349cc72a0b01c4faa4ffae6c735e1dde29...@enerasrv01.enera.local, Lars
Westerlind lars.westerl...@enera.se wrote:
AFAIK currently I write
CLASSITEM flavor
...
EXPRESSION cherry
Suggested extension would be to allow for
CLASSITEM
...
EXPRESSION cherry,mango,lime
But really, syntax is not my concern. A could very well use
expressions, but
the documentation says they are not good for performance. And my
first
question is if I've missed something?
Från: Fawcett, David [mailto:david.fawc...@state.mn.us]
Skickat: 13 August 2009 15:39
Till: Lars Westerlind; mapserver-users@lists.osgeo.org
Ämne: RE: [mapserver-users] Classitems selection
Do you mean something like ('[flavor]' IN ('cherry', 'mango',
'lime')?
-Original Message-
From: mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Lars
Westerlind
Sent: Thursday, August 13, 2009 2:39 AM
To: mapserver-users@lists.osgeo.org
Subject: [mapserver-users] Classitems selection
I use the CLASSITEM - EXPRESSION with string expression rather
much, which is
also recommended for performance. But sometimes I have a few values
that
could be shown in the same class. Wouldn't it be a nice idea to allow
for a
commaseparated set/list of strings to match?
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RE: SV: [mapserver-users] Classitems selection
Christy is right.
With a reasonably small number of items, either the IN syntax or the regular
expression will work.
I use the IN syntax to classify 87 counties in an app and it runs fast. A
recent comparison done by Adrian Popa indicates that the regular expression
syntax is faster.
Here is the thread:
http://lists.osgeo.org/pipermail/mapserver-users/2009-July/062071.html
David.
-Original Message-
From: mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Christy Nieman
Sent: Thursday, August 13, 2009 9:01 AM
To: Lars Westerlind
Cc: mapserver-users@lists.osgeo.org
Subject: Re: SV: [mapserver-users] Classitems selection
Hi,
When you say that you could very well use expressions, do you mean
regular expressions? In my experience, unless you are working with a
very large data set they're fine.
E.g.
CLASSITEM flavour
...
EXPRESSION /cherry|mango|lime/
Christy
Lars Westerlind wrote:
AFAIK currently I write
CLASSITEM flavor
...
EXPRESSION cherry
Suggested extension would be to allow for
CLASSITEM
...
EXPRESSION cherry,mango,lime
But really, syntax is not my concern. A could very well use
expressions, but the documentation says they are not good for
performance. And my first question is if I've missed something?
--
--
*Från:* Fawcett, David [mailto:david.fawc...@state.mn.us]
*Skickat:* 13 August 2009 15:39
*Till:* Lars Westerlind; mapserver-users@lists.osgeo.org
*Ämne:* RE: [mapserver-users] Classitems selection
Do you mean something like ('[flavor]' IN ('cherry', 'mango', 'lime')?
-Original Message-
*From:* mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] *On Behalf Of
*Lars Westerlind
*Sent:* Thursday, August 13, 2009 2:39 AM
*To:* mapserver-users@lists.osgeo.org
*Subject:* [mapserver-users] Classitems selection
I use the CLASSITEM - EXPRESSION with string expression rather
much, which is also recommended for performance. But sometimes I
have a few values that could be shown in the same class. Wouldn't
it be a nice idea to allow for a commaseparated set/list of
strings to match?
--
--
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