v.db.addtable.1grass - Man Page

Creates and connects a new attribute table to a given layer of an existing vector map.


vector, attribute table, database


v.db.addtable --help
v.db.addtable map=name  [table=string]   [layer=integer]   [key=name]   [columns=name type[,name type,...]]   [--help]  [--verbose]  [--quiet]  [--ui]



Print usage summary


Verbose module output


Quiet module output


Force launching GUI dialog


map=name [required]

Name of vector map
Or data source for direct OGR access


Name of new attribute table (default: vector map name)


Layer number where to add new attribute table
Default: 1


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’


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).


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.


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


Markus Neteler

Source Code

Available at: v.db.addtable source code (history)

Accessed: Tuesday Mar 19 11:02:39 2024

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