This is the command v.db.addcolumngrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
v.db.addcolumn - Adds one or more columns to the attribute table connected to a given
vector map.
KEYWORDS
vector, attribute table, database
SYNOPSIS
v.db.addcolumn
v.db.addcolumn --help
v.db.addcolumn map=name [layer=string] columns=string [--help] [--verbose] [--quiet]
[--ui]
Flags:
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
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=string [required]
Name and type of the new column(s) (’name type [,name type, ...]’)
Data types depend on database backend, but all support VARCHAR(), INT, DOUBLE
PRECISION and DATE
DESCRIPTION
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.
NOTES
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.
EXAMPLES
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
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