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v.db.addcolumn(1) GRASS GIS User's Manual v.db.addcolumn(1)

v.db.addcolumn - Adds one or more columns to the attribute table connected to a given vector map.

vector, attribute table, database

v.db.addcolumn
v.db.addcolumn --help
v.db.addcolumn map=name [layer=string] columns=name type[,name type,...] [--help] [--verbose] [--quiet] [--ui]

--help

Print usage summary
--verbose

Verbose module output
--quiet

Quiet module output
--ui

Force launching GUI dialog

map=name [required]

Name of vector map
Or data source for direct OGR access
layer=string

Layer number where to add column(s)
Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
Default: 1
columns=name type[,name type,...] [required]

Name and type of the new column(s) (’name type [,name type, ...]’)
Types depend on database backend, but all support VARCHAR(), INT, DOUBLE PRECISION and DATE. Example: ’label varchar(250), value integer’

v.db.addcolumn adds one or more column(s) to the attribute table connected to a given vector map. It automatically checks the connection for the specified layer.

v.db.addcolumn is a front-end to db.execute to allow easier usage. The supported types of columns depend on the database backend. However, all backends should support VARCHAR, INT, DOUBLE PRECISION and DATE.

The existing database connection(s) can be verified with v.db.connect.

Adding a single column:

g.copy vect=roadsmajor,myroads
v.db.addcolumn myroads columns="slope double precision"
v.info -c myroads

Adding two columns:


g.copy vect=roadsmajor,myroads
v.db.addcolumn myroads columns="slope double precision,myname varchar(15)"
v.info -c myroads

db.connect, db.execute, v.db.addtable, v.db.connect, v.db.dropcolumn, v.db.droptable, v.db.select, v.db.update
GRASS SQL interface

Moritz Lennert (mlennert@club.worldonline.be)

Available at: v.db.addcolumn source code (history)

Main index | Vector index | Topics index | Keywords index | Graphical index | Full index

© 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual

GRASS 7.8.6

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