[GRASS-user] help with v.db.update

[Richard Chirgwin]

"I don't know" is the short answer. Hamish's suggested worked here for 
v.db.update, but when I used "like" in v.db.update, it failed with the 
same error as you saw.

Perhaps a bug in the driver?

Richard

On 6/04/11 5:12 PM, Sharon M wrote:
> Why does the DBF driver handle like when using v.db.select?
>
> On Wed, Apr 6, 2011 at 4:29 PM, Richard Chirgwin
> <rchirgwin at ozemail.com.au>  wrote:
>> On 6/04/11 4:36 PM, grass-user-request at lists.osgeo.org wrote:
>>> Message: 9
>>> Date: Wed, 6 Apr 2011 16:06:13 +0930
>>> From: Sharon M<morrisxs09 at gmail.com>
>>> Subject: [GRASS-user] help with v.db.update
>>> To:grass-user at lists.osgeo.org
>>> Message-ID:<BANLkTi=oHUEGstNAuinLiYAMfo5-P3RBFA at mail.gmail.com>
>>> Content-Type: text/plain; charset=ISO-8859-1
>>>
>>> I'm trying to update an attribute table column using v.db.update with
>>> the DBF driver and keep getting a dbmi: Protocol error message.
>>>
>>> Example using Spearfish
>>>
>>> g.copy vect=fields,myfields
>>>
>>> v.db.addcol myfields col="polynum integer"
>>>
>>> v.db.select myfields where="label like 'V%'"
>>> cat|label|polynum
>>> 59|V. White#1|
>>>
>>> v.db.update myfields col=polynum val=42 where="label like 'V%'"
>>> dbmi: Protocol error
>>> ERROR: Error while executing: 'UPDATE myfields SET polynum=42 WHERE
>>> label like V%
>>> '
>>>
>>> I've tried this on both winGrass 6.4 rc2 or winGrass 6.5 r45847 on
>>> winXP using the wxGUI via both the v.db.update module and the wxgui
>>> command line and get the same error issue.
>>>
>>> What am I doing wrong? Can anyone help please?
>>>
>>> Thanks in advance!
>> The dbf driver doesn't handle "like". Try:
>>
>> v.db.update myfields column=polynum val=42 where='cat=59'
>>
>> and see what happens ...
>>
>> If you need more advanced query parameters such as "like", use a different
>> database driver - pg or mysql.
>>
>> Richard
>> If
>>
>>