v.db.addcolumn
Adds one or more columns to the attribute table connected to a given vector map.
v.db.addcolumn map=name [layer=string] columns=name type [,name type,...] [--verbose] [--quiet] [--qq] [--ui]
Example:
v.db.addcolumn map=name columns=name type
grass.script.run_command("v.db.addcolumn", map, layer="1", columns, verbose=False, quiet=False, superquiet=False)
Example:
gs.run_command("v.db.addcolumn", map="name", columns="name type")
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'
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--qq
Very quiet module output
--ui
Force launching GUI dialog
map : str, required
Name of vector map
Or data source for direct OGR access
Used as: input, vector, name
layer : str, optional
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.
Used as: input, layer
Default: 1
columns : str | list[str], 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'
Used as: name type
verbose: bool, optional
Verbose module output
Default: False
quiet: bool, optional
Quiet module output
Default: False
superquiet: bool, optional
Very quiet module output
Default: False
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
SEE ALSO
db.connect, db.execute, v.db.addtable, v.db.connect, v.db.dropcolumn, v.db.droptable, v.db.select, v.db.update
AUTHOR
Moritz Lennert (mlennert@club.worldonline.be)
SOURCE CODE
Available at: v.db.addcolumn source code
(history)
Latest change: Friday Feb 07 19:16:09 2025 in commit a82a39f