xenial (1) v.db.addtable.1grass.gz

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

SEE ALSO

         db.connect,  db.droptable,  db.execute,  v.db.addtable,  v.db.connect, v.db.dropcolumn, v.db.droptable,
       v.db.select, v.db.update
       GRASS SQL interface

AUTHOR

       Markus Neteler

       Last changed: $Date: 2013-05-11 15:23:40 +0200 (Sat, 11 May 2013) $

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       © 2003-2016 GRASS Development Team, GRASS GIS 7.0.3 Reference Manual