[Mapserver-users] msyyparse() - parse error

[Steve Lime]

Hi there: Msyyparse() is the function that evaluates MapServer expressions. There
are 3 possibilities: 

1) There is an error in the expression you're using.
2) There is something funky in your data, that breaks an expression.
3) There is an error in the code itself.

Although 1) and 3) are possible they seem unlikely. My guess is that there is an
issue with certain data values and the expressions. One example would be
data values containing embeded quotes. Let's say you had a place name
called O'Reilly and where using an expression like:

('[placename]' = 'foo') which would become in the case of O'Reilly,

('O'Reilly' = 'foo') and this would cause a parse error. 

Could also happen with numeric fields that didn't contain numbers or are empty.
We'd really need to see your mapfile to make the call.

Steve

>>> Möri Cédric <Cedric.Moeri at bd.so.ch> 3/22/2004 4:27:42 AM >>>
Hello list!

we recently upgraded our systems from
MapServer3.6.6/postgreSQL7.2.4/postgis0.8.0 to
MapServer4.0.1/postgreSQL7.4.2/postgis0.8.1. The system is running under
Linux RH7.2.

Now i'm reciving sometimes this strange error "msyyparse(): Expression
parser error. parse error".
(In the old version, everyting worked perfect!)

I'm not able to reproduce this error regularly. Sometimes it triggers when
i'm switching some layers on/off, sometimes it triggers when i'm just paning
(same layer-set/same scale). Sometimes it triggers only one time, othertimes
up to 60 times with still the same mapfile. 

I read from the archives that there might be some issue about the querrying
in postgis but there is not much more.

So I guess I'm stuck. Has anybody a hint for me in which direction to go on
with my quest? May anybody explain what the msyyparse does, and when it is
called?

Any hint would be appreciated!
If needed I would be glad to provide further information.

best regards
mit freundlichen Grüssen

Cédric Möri

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