## DESCRIPTION

v.db.connect prints or sets database connection for a vector map.

## NOTE

If parameters for database connection are already set with db.connect, they are taken as default values and do not need to be spcified each time.

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).

## EXAMPLE

Print database connection
v.db.connect -p map=vectormap

Print column types and names of table linked to vector map
v.db.connect -c map=vectormap

### Connect vector map to database (DBF driver)

Connect vector map to database with variables
Using default DB connection:
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

### Connect vector map to database (PostgreSQL driver)

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

## SEE ALSO

db.connect, db.copy, v.overlay,

## AUTHOR

Radim Blazek, ITC-Irst, Trento, Italy

Last changed: $Date: 2005/10/20 15:20:01 $