
Attention: Removing a vector map will also delete all tables linked to it! If you use v.db.connect to link further tables to your map, it is advisable to make a copy from those tables first and connect the copied tables to the vector map (see also v.overlay).
v.db.connect -p map=vectormap
Print column types and names of table linked to vector map
v.db.connect -c map=vectormap
v.db.connect map=vectormap table=table
Using hardcoded path to DBF directory:
v.db.connect map=vectormap table=table database=/home/user/grassdata/spearfish60/PERMANENT/dbf
Using variable as DBF directory definition, single quotes must be used:
v.db.connect map=vectormap table=table database='$GISDBASE/$LOCATION_NAME/$MAPSET/dbf/'
Connect vector map layer 2 and key ID to database with variables
(note: if needed, single quotes must be used for the database parameter)
v.db.connect map=vectormap table=table layer=2 key=ID
v.db.connect map=vectormap table=table layer=1 key=oid driver=pg \ database="host=myserver.itc.it,dbname=mydb,user=name" table=mytable key=id
# Check current settings for attribute storage:
db.connect -p
# Import table from PostgreSQL to new map
# (NOTE: output map name needs to be different from table name in
# case that GRASS is connected to PostgreSQL):
v.in.db driver=pg database="host=localhost,dbname=meteo" \
table=mytable x=lon y=lat key=cat out=mytable
v.db.connect map=mytable -p
# Cancel table connection between map and attribute table:
v.db.connect map=mytable -d
v.db.connect map=mytable -p
# Drop table which was replicated due to import:
db.tables -p
echo "DROP TABLE mytable" | db.execute
db.tables -p
# reconnect map to table in PostgreSQL:
v.db.connect map=mytable driver=pg database="host=localhost,dbname=meteo" \
table=mytable key=cat
# Now the geometry is stored in GRASS while the attributes are stored
# in PostgreSQL.
# Check current settings for attribute storage:
db.connect -p
# Import table from PostGIS to new map
# (NOTE: output map name needs to be different from table name in
# case that GRASS is connected to PostGIS):
v.in.db driver=pg database="host=localhost,dbname=meteo" \
table=mytable x="x(geom)" y="y(geom)" key=cat out=mytable
v.db.connect map=mytable -p
# Cancel table connection between map and attribute table:
v.db.connect map=mytable -d
v.db.connect map=mytable -p
# Drop table which was replicated due to import:
db.tables -p
echo "DROP TABLE mytable" | db.execute
db.tables -p
# reconnect map to table in PostGIS:
v.db.connect map=mytable driver=pg database="host=localhost,dbname=meteo" \
table=mytable key=cat
# Now the geometry is stored in GRASS while the attributes are stored
# in PostGIS.
Last changed: $Date: 2006/03/23 17:57:40 $