Mapfile Expression NULL value

[Steve Lime]

It really depends on how your datastore coughs up the data. I don't believe
there is a true NULL with DBF files but I may be wrong. You might try 
expressions like:

  EXPRESSION (not '[tx_femme]')
  EXPRESSION ('[tx_femme]' = '')

Steve

>>> Emmanuel BELO <emmanuel.belo at MICROGIS.CH> 03/06/06 9:11 AM >>>
Hi,

how do you handle NULL values from you database in your mapfile's 
expression?

Example (NULL value for some tx_femme):

  CLASS
     EXPRESSION (([tx_femme] > 8) AND ([tx_femme] <= 15))
     NAME "8 - 15"
     STYLE
       COLOR 255 217 0
     END
   END

I've tried:

EXPRESSION ('[tx_femme]' = 'NULL')

EXPRESSION /_always_false_/

Best regards,

Emmanuel BELO