v.db.addtable(1grass) GRASS GIS User's Manual v.db.addtable(1grass)
NAME
v.db.addtable - Creates and connects a new attribute table to a given
layer of an existing vector map.
KEYWORDS
vector, attribute table, database
SYNOPSIS
v.db.addtable
v.db.addtable --help
v.db.addtable map=name [table=string] [layer=integer] [key=name]
[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
table=string
Name of new attribute table (default: vector map name)
layer=integer
Layer number where to add new attribute table
Default: 1
key=name
Name of key column
Must refer to an integer column
Default: cat
columns=name type[,name type,...]
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 in-
teger’
DESCRIPTION
v.db.addtable creates and adds a new attribute table to a given vector
map. It links the table to the specified layer of the vector map. If
the vector map is not yet linked to any table, new a database link is
established based on the MAPSET database settings (see db.connect).
NOTES
v.db.addtable is a front-end to db.execute to allow easier usage.
v.db.addtable will only insert category values into the table for those
features which actually have a category value in the relevant layer.
The user can add category values automatically by using v.category or
manually with wxGUI vector digitizer before running v.db.addtable. Or
one can run v.db.addtable first and then use either a combinatino of
v.category + v.to.db or wxGUI vector digitizer to add the relevant
lines to the table.
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.
EXAMPLE
Adding a new attribute table with a single column to default layer 1:
g.copy vect=roadsmajor,myroads
v.db.addtable myroads columns="slope double precision"
v.db.connect -p myroads
v.info -c myroads
Adding a new attribute table with two columns to layer 2:
g.copy vect=roadsmajor,myroads
v.db.addtable myroads columns="slope double precision, roadname varchar(15)" layer=2
v.db.connect -p myroads
v.info -c myroads
v.info -c myroads layer=2
SEE ALSO
db.connect, db.droptable, db.execute, v.db.connect, v.db.dropcolumn,
v.db.droptable, v.db.select, v.db.update
GRASS SQL interface
AUTHOR
Markus Neteler
SOURCE CODE
Available at: v.db.addtable source code (history)
Accessed: unknown
Main index | Vector index | Topics index | Keywords index | Graphical
index | Full index
© 2003-2022 GRASS Development Team, GRASS GIS 7.8.7 Reference Manual
GRASS 7.8.7 v.db.addtable(1grass)
Generated by dwww version 1.14 on Sun Dec 29 19:29:42 CET 2024.