NAME¶
v.db.addtable - Creates and connects a new attribute table to a
given layer of an existing vector map.
KEYWORDS¶
vector, database, attribute table
SYNOPSIS¶
v.db.addtable
v.db.addtable help
v.db.addtable map=
name [
table=
string]
[
layer=
integer] [
columns=
name type[,
name
type,...]] [--
verbose] [--
quiet]
Parameters:¶
- map=name
-
Vector map for which to add new attribute table
- table=string
-
Name of new attribute table (default: vector map name)
- layer=integer
-
Layer where to add new attribute table
Default: 1
- columns=name type[,name type,...]
-
Name and type of the new column(s) (types depend on database backend, but
all support VARCHAR(), INT, DOUBLE PRECISION and DATE)
Default: cat integer
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 use
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.addtable, v.db.connect, v.db.dropcol,
v.db.droptable, v.db.select, v.db.update
GRASS SQL interface
AUTHOR¶
Markus Neteler
Last changed: $Date: 2012-11-25 14:27:13 +0100 (Sun, 25 Nov 2012) $
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