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: Friday Apr 04 01:21:12 2025

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

       © 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual

GRASS 8.4.1                                                                                v.db.addtable(1grass)