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"""
@package dbm_base.py
@brief Support classes for dbm.py
List of classes:
- VectorDBInfo
(C) 2007-2011 by the GRASS Development Team
This program is free software under the GNU General Public
License (>=v2). Read the file COPYING that comes with GRASS
for details.
@author Martin Landa <landa.martin gmail.com>
"""
import os
import types
import wx
import gselect
import gcmd
from preferences import globalSettings as UserSettings
import grass.script as grass
def unicodeValue(value):
"""!Encode value"""
if type(value) == types.UnicodeType:
return value
enc = UserSettings.Get(group = 'atm', key = 'encoding', subkey = 'value')
if enc:
value = unicode(value, enc)
elif 'GRASS_DB_ENCODING' in os.environ:
value = unicode(value, os.environ['GRASS_DB_ENCODING'])
else:
try:
value = unicode(value, 'ascii')
except UnicodeDecodeError:
value = _("Unable to decode value. Set encoding in GUI preferences ('Attributes').")
return value
def createDbInfoDesc(panel, mapDBInfo, layer):
"""!Create database connection information content"""
infoFlexSizer = wx.FlexGridSizer (cols = 2, hgap = 1, vgap = 1)
infoFlexSizer.AddGrowableCol(1)
infoFlexSizer.Add(item = wx.StaticText(parent = panel, id = wx.ID_ANY,
label = "Driver:"))
infoFlexSizer.Add(item = wx.StaticText(parent = panel, id = wx.ID_ANY,
label = mapDBInfo.layers[layer]['driver']))
infoFlexSizer.Add(item = wx.StaticText(parent = panel, id = wx.ID_ANY,
label = "Database:"))
infoFlexSizer.Add(item = wx.StaticText(parent = panel, id = wx.ID_ANY,
label = mapDBInfo.layers[layer]['database']))
infoFlexSizer.Add(item = wx.StaticText(parent = panel, id = wx.ID_ANY,
label = "Table:"))
infoFlexSizer.Add(item = wx.StaticText(parent = panel, id = wx.ID_ANY,
label = mapDBInfo.layers[layer]['table']))
infoFlexSizer.Add(item = wx.StaticText(parent = panel, id = wx.ID_ANY,
label = "Key:"))
infoFlexSizer.Add(item = wx.StaticText(parent = panel, id = wx.ID_ANY,
label = mapDBInfo.layers[layer]['key']))
return infoFlexSizer
class VectorDBInfo(gselect.VectorDBInfo):
"""!Class providing information about attribute tables
linked to the vector map"""
def __init__(self, map):
gselect.VectorDBInfo.__init__(self, map)
def GetColumns(self, table):
"""!Return list of columns names (based on their index)"""
try:
names = [''] * len(self.tables[table].keys())
except KeyError:
return []
for name, desc in self.tables[table].iteritems():
names[desc['index']] = name
return names
def SelectByPoint(self, queryCoords, qdist):
"""!Get attributes by coordinates (all available layers)
Return line id or None if no line is found"""
line = None
nselected = 0
data = grass.vector_what(map = self.map,
coord = (float(queryCoords[0]), float(queryCoords[1])),
distance = float(qdist))
if len(data) < 1 or 'Table' not in data[0]:
return None
# process attributes
table = data[0]['Table']
for key, value in data[0]['Attributes'].iteritems():
if len(value) < 1:
value = None
else:
if self.tables[table][key]['ctype'] != types.StringType:
value = self.tables[table][key]['ctype'] (value)
else:
value = unicodeValue(value)
self.tables[table][key]['values'].append(value)
ret = dict()
for key, value in data[0].iteritems():
if key == 'Attributes':
continue
ret[key] = list()
ret[key].append(value)
return ret
def SelectFromTable(self, layer, cols = '*', where = None):
"""!Select records from the table
Return number of selected records, -1 on error
"""
if layer <= 0:
return -1
nselected = 0
table = self.layers[layer]["table"] # get table desc
# select values (only one record)
if where is None or where is '':
sql = "SELECT %s FROM %s" % (cols, table)
else:
sql = "SELECT %s FROM %s WHERE %s" % (cols, table, where)
ret = gcmd.RunCommand('db.select',
parent = self,
read = True,
quiet = True,
flags = 'v',
sql= sql,
database = self.layers[layer]["database"],
driver = self.layers[layer]["driver"])
# self.tables[table][key][1] = str(cat)
if ret:
for line in ret.splitlines():
name, value = line.split('|')
# casting ...
if value:
if self.tables[table][name]['ctype'] != type(''):
value = self.tables[table][name]['ctype'] (value)
else:
value = unicodeValue(value)
else:
value = None
self.tables[table][name]['values'].append(value)
nselected = 1
return nselected
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