v.db.addtablegrass - Online in the Cloud

PROGRAM:

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)
Types depend on database backend, but all support VARCHAR(), INT, DOUBLE PRECISION and
DATE. Example: "label varchar(250), type 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

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