db.connect.1grass man page

db.connect — Prints/sets general DB connection for current mapset.

Keywords

database, attribute table, connection settings

Synopsis

db.connect
db.connect --help
db.connect [-pgcd] [driver=name] [database=name] [schema=name] [group=string] [--help] [--verbose] [--quiet] [--ui]

Flags

-p
Print current connection parameters and exit
Substitute variables in database settings
-g
Print current connection parameters using shell style and exit
-c
Check connection parameters, set if uninitialized, and exit
-d
Set from default settings and exit
Overwrite current settings if already initialized
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog

Parameters

driver=name
Name of database driver
Options: mesql, pg, dbf, sqlite, odbc, ogr, mysql
Default: sqlite
database=name
Name of database
Default: $GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db
schema=name
Database schema
Do not use this option if schemas are not supported by driver/database server
group=string
Default group of database users to which select privilege is granted

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 7 is SQLite.

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.

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

PostgreSQL

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

db.connect driver=pg database="host=myserver.itc.it,dbname=mydb"
db.login user=myname [pass=secret]
db.connect -p
db.tables -p

PostgreSQL with different port

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

db.connect driver=pg database="host=myserver.itc.it,dbname=mydb,port=6666"
db.login user=myname [pass=secret]
db.connect -p
db.tables -p

MySQL (local connection)

Local storage (db.login may not be needed):

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

MySQL (external server)

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

db.connect driver=mysql database="host=myserver.itc.it,dbname=mydb"
db.login user=myname [pass=secret]
db.connect -p
db.tables -p

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 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

Last changed: $Date: 2014-11-28 10:58:18 +0100 (Fri, 28 Nov 2014) $

Main index | Database index | Topics index | Keywords index | Full index

© 2003-2016 GRASS Development Team, GRASS GIS 7.0.4 Reference Manual

Info

GRASS 7.0.4 Grass User's Manual