Re: [GRASS-user] Re: combining and evaluating vector dbf values
On Tue, Nov 25, 2008 at 9:07 AM, maning sambale [EMAIL PROTECTED] wrote: Nearly there but not quite: The final column should combine the values from the 2 columns, am I right that concat doesn't work with dbf? So this doesn't work echo UPDATE vectormap SET c_COVER = a_COVER || a_value | db.execute Did you try the SQLite driver? Just create a new mapset, define the connection with db.connect (see manual for copy-paste command) and g.copy the map from the DBF mapset into the sqlite mapset. Then the joys of SQL are available. Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Re: combining and evaluating vector dbf values
Nearly there but not quite: The final column should combine the values from the 2 columns, am I right that concat doesn't work with dbf? So this doesn't work echo UPDATE vectormap SET c_COVER = a_COVER || a_value | db.execute cheers, maning On Tue, Nov 25, 2008 at 2:34 PM, maning sambale [EMAIL PROTECTED] wrote: Hi, Answering partially to my problem. I found a way to update columns by from a criteria of another column like this: v.info -c overlay_trainingANDforest2002_sq lDisplaying column types/names for database connection of layer 1: INTEGER|cat INTEGER|a_cat INTEGER|a_value CHARACTER|a_label INTEGER|a_COVER INTEGER|b_cat CHARACTER|b_ID CHARACTER|b_TYPE INTEGER|c_COVER v.db.update map=overlay_trainingANDforest2002_sql col=c_COVER value=112 where=a_Cover=112 And It's really fast for 100K records! Now, how do make an sql expression by evaluationg multiple columns? cheers, maning On Tue, Nov 25, 2008 at 12:01 PM, maning sambale [EMAIL PROTECTED] wrote: Hi, Any help in doing the following: I have a combined vector in grass using v.overlay I now have a dbf table with the following a_value = integer a_value2 = integer b_value = string Now I want to combine the categories in another column (c_value) like : evaluate b_value, a_value, a_value2 then assign c_value from a lookup table the lookup table is a set of integer values based on the various combinations of b_value, a_value, a_value2 Any ideas doing this in GRASS or oodbase? cheers, maning -- |-|--| | __.-._ |Ohhh. Great warrior. Wars not make one great. -Yoda | | '-._7' |Freedom is still the most radical idea of all -N.Branden| | /'.-c |Linux registered user #402901, http://counter.li.org/ | | | /T |http://esambale.wikispaces.com/ | | _)_/L I http://epsg4253.wordpress.com/ | |-|--| -- |-|--| | __.-._ |Ohhh. Great warrior. Wars not make one great. -Yoda | | '-._7' |Freedom is still the most radical idea of all -N.Branden| | /'.-c |Linux registered user #402901, http://counter.li.org/ | | | /T |http://esambale.wikispaces.com/ | | _)_/L I http://epsg4253.wordpress.com/ | |-|--| -- |-|--| | __.-._ |Ohhh. Great warrior. Wars not make one great. -Yoda | | '-._7' |Freedom is still the most radical idea of all -N.Branden| | /'.-c |Linux registered user #402901, http://counter.li.org/ | | | /T |http://esambale.wikispaces.com/ | | _)_/L I http://epsg4253.wordpress.com/ | |-|--| ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Re: combining and evaluating vector dbf values
Hi, Answering partially to my problem. I found a way to update columns by from a criteria of another column like this: v.info -c overlay_trainingANDforest2002_sq lDisplaying column types/names for database connection of layer 1: INTEGER|cat INTEGER|a_cat INTEGER|a_value CHARACTER|a_label INTEGER|a_COVER INTEGER|b_cat CHARACTER|b_ID CHARACTER|b_TYPE INTEGER|c_COVER v.db.update map=overlay_trainingANDforest2002_sql col=c_COVER value=112 where=a_Cover=112 And It's really fast for 100K records! Now, how do make an sql expression by evaluationg multiple columns? cheers, maning On Tue, Nov 25, 2008 at 12:01 PM, maning sambale [EMAIL PROTECTED] wrote: Hi, Any help in doing the following: I have a combined vector in grass using v.overlay I now have a dbf table with the following a_value = integer a_value2 = integer b_value = string Now I want to combine the categories in another column (c_value) like : evaluate b_value, a_value, a_value2 then assign c_value from a lookup table the lookup table is a set of integer values based on the various combinations of b_value, a_value, a_value2 Any ideas doing this in GRASS or oodbase? cheers, maning -- |-|--| | __.-._ |Ohhh. Great warrior. Wars not make one great. -Yoda | | '-._7' |Freedom is still the most radical idea of all -N.Branden| | /'.-c |Linux registered user #402901, http://counter.li.org/ | | | /T |http://esambale.wikispaces.com/ | | _)_/L I http://epsg4253.wordpress.com/ | |-|--| -- |-|--| | __.-._ |Ohhh. Great warrior. Wars not make one great. -Yoda | | '-._7' |Freedom is still the most radical idea of all -N.Branden| | /'.-c |Linux registered user #402901, http://counter.li.org/ | | | /T |http://esambale.wikispaces.com/ | | _)_/L I http://epsg4253.wordpress.com/ | |-|--| ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
