## DESCRIPTION

db.connect allows the user to set database connection parameters. These parameters are then taken as default values by modules so that the user does not need to enter the parameters each time.

The default database backend in GRASS GIS is SQLite (since version 7).

## NOTES

Values are stored in the mapset's `VAR` file; the connection is not tested for validity.

The -p flag will display the current connection parameters.

The -c flag will silently check if the connection parameters have been set, and if not will set them to use GRASS's default values. (useful in scripts before you attempt to create a new database table)

To connect a vector map to a database table, use v.db.connect or v.db.addtable.

## EXAMPLES

### SQLite (default backend)

Local storage:

    db.connect -d
    db.connect -p
    db.tables -p

The SQLite database file is created automatically when used the first time.

See SQLite database driver for details.

### PostgreSQL (local connection)

Local storage, database tables stored in database "mydb" (may require the use of db.login):

    db.connect driver=pg database=mydb
    db.login user=myname pass=secret
    db.connect -p
    db.tables -p

See PostgreSQL database driver for details.

### PostgreSQL (network connection)

Network storage, database tables stored in database "mydb" (may require the use of db.login):

    db.connect driver=pg database=mydb
    db.login user=myname pass=secret host=myserver.com port=6666
    db.connect -p
    db.tables -p

See PostgreSQL database driver for details.

### MySQL (local connection)

Local storage, database tables stored in database "mydb" (may require the use of db.login):

    db.connect driver=mysql database=mydb
    db.login user=myname pass=secret
    db.connect -p
    db.tables -p

See MySQL database driver for details.

### MySQL (network connection)

Network storage, database tables stored in database "mydb" (may require the use of db.login):

    db.connect driver=mysql database=mydb
    db.login user=myname pass=secret host=myserver.com
    db.connect -p
    db.tables -p

See MySQL database driver for details.

### ODBC

Network storage, database tables stored in database "mydb" (may require the use of db.login):

    db.connect driver=odbc database=mydb
    db.login user=myname pass=secret
    db.connect -p
    db.tables -p

See ODBC database driver for details.

### DBF (local, not recommended)

Local storage (the dbf/ subdirectory in the mapset must exist or must be created by the user):

    db.connect driver=dbf database='$GISDBASE/$LOCATION_NAME/$MAPSET/dbf/'
    db.tables -p

See DBF database driver for details.

## SEE ALSO

db.columns, db.copy, db.drivers, db.login, db.tables, v.db.addtable, v.db.connect

GRASS SQL interface

## AUTHORS

Main author: Radim Blazek, ITC-Irst, Trento, Italy
GRASS 7 improvements: Martin Landa, Markus Metz