[GRASS-dev] drop / link table

[Paulo van Breugel]

In addition to my previous email: in the help of v.db.addtable, there is
the example:

g.copy vect=roadsmajor,myroads
v.db.addtable myroads columns="slope double precision"

However, when I try that, I am getting the following message:

"ERROR: There is already a table linked to layer <1>"



On Tue, Jan 1, 2013 at 8:14 PM, Paulo van Breugel <p.vanbreugel at gmail.com>wrote:

> Hi,
>
> First of all, happy new year. For me the year starts with some trouble
> dealing with attribute tables. Below two things I can't figure out. This is
> all in GRASS 7.0 on Linux
>
> (A)
>
> I am trying to link a second table to layer two of a vector layer. For
> example:
>
> v.db.addtable map=A table=A2 layer=2 columns='bio1  INTEGER,bio2  INTEGER'
>
> This creates, as expected, a table with a cat column (at least, in the
> table attribute manager, the tables shows with a cat column with values)
> and two empty columns bio1 and bio2
>
> Now I want to populate the bio1 and bio2 columns using v.what.rast:
>
> v.what.rast map=A Layer=2 raster=bio_1 at climate column=bio1
> v.what.rast map=A Layer=2 raster=bio_2 at climate column=bio2
>
> I am getting the following error message:
>
> Reading features from vector map...
>  100%
> WARNING: 316 points without category were skipped
> Update vector attributes...
> WARNING: No record for category 0 in table <A2>
>  100%
> v.what.rast complete. 0 records updated.
>
> But the table A2, linked to layer 2, does have category values. Or do I
> misunderstand how this works?
>
> (B)
>
> I wanted to drop the layer from a vector map.  In the Table Attribute
> manager, you can remove a layer without dropping (deleting) the table (the
> default). But how do I do this on the command line? Using the
> d.db.droptable removes the layer by dropping the table (or it removes the
> layer and drops the table, not sure what happens internally).
>
> Cheers,
>
> Paulo
>
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