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) $

       Main index | Vector index | Topics index | Keywords index | Full index

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

GRASS 7.0.3                                                                                v.db.addtable(1grass)