NAME
v.db.dropcolumn.py - Drops a column from the attribute table connected to a given vector map.
KEYWORDS
vector,
attribute table,
database
SYNOPSIS
v.db.dropcolumn.py
v.db.dropcolumn.py --help
v.db.dropcolumn.py map=name [layer=string] columns=name[,name,...] [--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 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
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.
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.
Dropping a column:
g.copy vect=roadsmajor,myroads
v.info -c myroads
v.db.dropcolumn myroads column=SHAPE_LEN
v.info -c myroads
db.connect,
db.dropcolumn,
db.execute,
v.db.addcolumn,
v.db.connect,
v.db.droptable,
v.db.select,
v.db.update
GRASS SQL interface
Markus Neteler
Last changed: $Date: 2011-11-08 22:24:20 +0100 (Ășt, 08 11 2011) $
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