On 03/07/09 11:45, achim wrote:
Hallo!
Is there an easy solution to insert values from v.net report into it's
table?
I did it external with sqlite creating a new table from a join and
connected my vectormap to that. But when I eg. add a node, I don't want
to redo the hole procedure.
Information given from v.net nreport consists of cat and a list of cats
from lines each node is connected to (see PS). It seems more complicated
to update this inside grass. -> Is it useful to get to know how grass
deals with nodes-lines in network internally??
No, not necessary. Just use a script such as this (assuming that the
table linked to your map contains a start_cat and a stop_cat column
defined as integer):
v.net YourMap operation=report | awk '{printf"UPDATE
NameOfTableLinkedToYourMap set start_cat=%i,stop_cat=%i where
cat=%i;\n", $2, $3, $1}' | db.execute
This can take quite some time if you have lots of lines in your network,
so you can limit to the cat value of the new node with something like
this (untested):
v.net YourMap operation=report | awk '{if($2==NewNodeCat ||
$3==NewNodeCat)printf"UPDATE NameOfTableLinkedToYourMap set
start_cat=%i,stop_cat=%i where cat=%i;\n", $2, $3, $1}' | db.execute
Moritz
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