Geografic-Information-System/scripts/v.db.addtable/v.db.addtable.html

<h2>DESCRIPTION</h2>

<em>v.db.addtable</em> 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 <em>db.connect</em>).

<h2>NOTES</h2>

<em>v.db.addtable</em> is a front-end to <em>db.execute</em> 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 <em>v.category</em> or manually with 
<em><a href="wxGUI.Vector_Digitizing_Tool.html">wxGUI vector digitizer</a></em> before running v.db.addtable. Or one can run v.db.addtable first
and then use either a combinatino of <em>v.category</em> + <em>v.to.db</em> or 
<em><a href="wxGUI.Vector_Digitizing_Tool.html">wxGUI vector digitizer</a></em> 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 default
dbf backend supports only these types.

The existing database connection(s) can be verified with <em>v.db.connect</em>.

<h2>EXAMPLE</h2>

Adding a new attribute table with a single column to default layer 1:<br>
<div class="code"><pre>
v.db.addtable sentiero_brenta_points columns="slope double precision"
v.db.connect -p sentiero_brenta_points
v.info -c sentiero_brenta_points
</pre></div>

<p>
Adding a new attribute table with two columns to layer 2:<br>
<div class="code"><pre>
v.db.addtable sentiero_brenta_points columns="slope double precision,myname varchar(15)" layer=2
v.db.connect -p sentiero_brenta_points
v.info -c sentiero_brenta_points
</pre></div>

<h2>SEE ALSO</h2>

<em><a HREF="db.connect.html">db.connect</a></em>,
<em><a HREF="db.droptable.html">db.droptable</a></em>,
<em><a HREF="db.execute.html">db.execute</a></em>,
<em><a HREF="v.category.html">v.category</a></em>,
<em><a HREF="v.db.addcolumn.html">v.db.addcolumn</a></em>,
<em><a HREF="v.db.connect.html">v.db.connect</a></em>,
<em><a HREF="v.db.dropcolumn.html">v.db.dropcolumn</a></em>,
<em><a HREF="v.db.droptable.html">v.db.droptable</a></em>,
<em><a HREF="v.db.select.html">v.db.select</a></em>,
<em><a HREF="v.db.update.html">v.db.update</a></em><br>
<em><a href="sql.html">GRASS SQL interface</a></em>


<h2>AUTHOR</h2>

Markus Neteler

<p>
<i>Last changed: $Date$</i>