[MAPSERVER-USERS] CLASSITEM and EXPRESSION issue in trunk?

[Pål Kristensen]

Hi Steve!

We did an interesting discovery yesterday when we compiled the 8002 revision
of the MapServer code. The Expression error were still present, but revision
8002 was the last one before the rewritten PostGIS code was submitted. When
we then tried to compile the 5.2 stable, everything worked as expected. The
error can't then be linked to the new PostGIS support, but must be caused by
some other enhancements posted after 5.2.

Regards,
Pål Kristensen


Steve Lime wrote:
> 
> The PostGIS support underwent major changes recently so I'd suspect this
> is specific
> to that work. Perhaps there are character padding affecting things?
> 
> Steve
> 
>>>> Pål Kristensen <pal.kristensen at statkart.no> 11/21/08 8:36 AM >>>
> 
> Hi!
> 
> I've compiled 5.3-dev from trunk yesterday and got some trouble with
> some
> mapfiles that works well on 5.2. The problem is that the EXPRESSION
> parameter in the CALSS object does not work with direct string
> comparison.
> Her are some examples:
> 
> Does NOT work: (This is the original layer definition from the 5.2
> mapfile)
> 
> LAYER
>    ...
>    CLASSITEM "maxhoyde"
>    ...
>    CLASS
>       NAME "test"
>       EXPRESSION "600"
>       ...
>     END
> END
> 
> 
> Using RegEx instead WORKS:
> 
> LAYER
>    ...
>    CLASSITEM "maxhoyde"
>    ...
>    CLASS
>       NAME "test"
>       EXPRESSION /600/
>       ...
>     END
> END
> 
> 
> Using logical expression WORKS:
> 
> LAYER
>    ...
>    #CLASSITEM "maxhoyde"
>    ...
>    CLASS
>       NAME "test"
>       EXPRESSION ([makshoyde] == 600)
>       ...
>     END
> END
> 
> The data is stored in PostgreSQL (PostGIS), and the actual field type is
> character(5). Anyone have a clue about what is causing this strange
> behavior. 
> 
> Regards,
> Pål Kristensen
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