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 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 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: Tuesday Jun 27 11:14:34 2023

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       © 2003-2023 GRASS Development Team, GRASS GIS 8.3.0 Reference Manual