v.db.addcolumn(1grass) | Grass User's Manual | v.db.addcolumn(1grass) |
v.db.addcolumn - Adds one or more columns to the attribute table connected to a given vector map.
vector, attribute table, database
v.db.addcolumn
v.db.addcolumn --help
v.db.addcolumn map=name [layer=string]
columns=name type[,name type,...] [--help]
[--verbose] [--quiet] [--ui]
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)
Last changed: $Date: 2011-11-08 22:24:20 +0100 (Tue, 08 Nov 2011) $
Available at: v.db.addcolumn source code (history)
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