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 05:27:13 -0800 (Sun, 25 Nov 2012) $

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       © 2003-2013 GRASS Development Team