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=name type[,name type,...] [--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=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)
SOURCE CODE
Available at:
v.db.addcolumn source code
(history)
Latest change: Saturday Apr 20 18:04:12 2024 in commit: ef730b99931719ee3f1bdc76aedba771fa15458d
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GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual