v.db.dropcolumn
Drops a column from the attribute table connected to a given vector map.
v.db.dropcolumn map=name [layer=string] columns=name [,name,...] [--verbose] [--quiet] [--qq] [--ui]
Example:
v.db.dropcolumn map=name columns=name
grass.script.run_command("v.db.dropcolumn", map, layer="1", columns, verbose=False, quiet=False, superquiet=False)
Example:
gs.run_command("v.db.dropcolumn", map="name", columns="name")
Parameters
map=name [required]
Name of vector map
Or data source for direct OGR access
layer=string
Layer number or name
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 [,name,...] [required]
Name of attribute column(s) to drop
--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 or name
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 of attribute column(s) to drop
Used as: input, dbcolumn, name
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.dropcolumn drops a column from the attribute table connected to a given vector map. It automatically checks the connection for the specified layer. v.db.dropcolumn omits to delete the 'cat' column which is relevant to keep the connection between vector map and table.
NOTES
v.db.dropcolumn is a front-end to db.execute to allow easier usage.
The existing database connection(s) can be verified with v.db.connect.
EXAMPLES
Dropping a column:
g.copy vect=roadsmajor,myroads
v.info -c myroads
v.db.dropcolumn myroads column=SHAPE_LEN
v.info -c myroads
SEE ALSO
db.connect, db.dropcolumn, db.execute, v.db.addcolumn, v.db.connect, v.db.droptable, v.db.select, v.db.update
AUTHOR
Markus Neteler
SOURCE CODE
Available at: v.db.dropcolumn source code
(history)
Latest change: Monday Feb 10 14:42:02 2025 in commit 5fe1b99