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"""
@package dbmgr.vinfo
@brief Support classes for Database Manager
List of classes:
- vinfo::VectorDBInfo
(C) 2007-2013 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 wx
from gui_core.gselect import VectorDBInfo as VectorDBInfoBase
from gui_core.wrap import StaticText
from core.gcmd import RunCommand, GError
from core.settings import UserSettings
import grass.script as grass
def GetUnicodeValue(value):
"""Get unicode value
:param value: value to be recoded
:return: unicode value
"""
if isinstance(value, str):
return value
if isinstance(value, bytes):
enc = GetDbEncoding()
return str(value, enc, errors="replace")
else:
return str(value)
def GetDbEncoding():
"""Checks if user set DB encoding (first user settings,
then env variable), if not assumes unicode."""
enc = UserSettings.Get(group="atm", key="encoding", subkey="value")
if not enc and "GRASS_DB_ENCODING" in os.environ:
enc = os.environ["GRASS_DB_ENCODING"]
else:
enc = "utf-8" # assuming UTF-8
return enc
def CreateDbInfoDesc(panel, mapDBInfo, layer):
"""Create database connection information content"""
infoFlexSizer = wx.FlexGridSizer(cols=2, hgap=1, vgap=1)
infoFlexSizer.AddGrowableCol(1)
infoFlexSizer.Add(StaticText(parent=panel, id=wx.ID_ANY, label="Driver:"))
infoFlexSizer.Add(
StaticText(parent=panel, id=wx.ID_ANY, label=mapDBInfo.layers[layer]["driver"])
)
infoFlexSizer.Add(StaticText(parent=panel, id=wx.ID_ANY, label="Database:"))
infoFlexSizer.Add(
StaticText(
parent=panel, id=wx.ID_ANY, label=mapDBInfo.layers[layer]["database"]
)
)
infoFlexSizer.Add(StaticText(parent=panel, id=wx.ID_ANY, label="Table:"))
infoFlexSizer.Add(
StaticText(parent=panel, id=wx.ID_ANY, label=mapDBInfo.layers[layer]["table"])
)
infoFlexSizer.Add(StaticText(parent=panel, id=wx.ID_ANY, label="Key:"))
infoFlexSizer.Add(
StaticText(parent=panel, id=wx.ID_ANY, label=mapDBInfo.layers[layer]["key"])
)
return infoFlexSizer
class VectorDBInfo(VectorDBInfoBase):
"""Class providing information about attribute tables
linked to the vector map"""
def __init__(self, map):
VectorDBInfoBase.__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].items():
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
try:
data = grass.vector_what(
map=self.map,
coord=(float(queryCoords[0]), float(queryCoords[1])),
distance=float(qdist),
)
except grass.ScriptError:
GError(
parent=None,
message=_(
"Failed to query vector map <{map}>. "
"Check database settings and topology."
).format(map=self.map),
)
if len(data) < 1 or all(("Table" not in record) for record in data):
return None
# process attributes
ret = dict()
for key in ["Category", "Layer", "Table", "Id"]:
ret[key] = list()
for record in data:
if "Table" not in record:
continue
table = record["Table"]
for key, value in record["Attributes"].items():
if len(value) < 1:
value = None
else:
if self.tables[table][key]["ctype"] != str:
value = self.tables[table][key]["ctype"](value)
else:
value = GetUnicodeValue(value)
self.tables[table][key]["values"].append(value)
for key, value in record.items():
if key == "Attributes":
continue
if key in ret:
ret[key].append(value)
if "Id" not in record.keys():
ret["Id"].append(None)
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 == "":
sql = "SELECT %s FROM %s" % (cols, table)
else:
sql = "SELECT %s FROM %s WHERE %s" % (cols, table, where)
ret = RunCommand(
"db.select",
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 not isinstance("", self.tables[table][name]["ctype"]):
value = self.tables[table][name]["ctype"](value)
else:
value = GetUnicodeValue(value)
else:
value = None
self.tables[table][name]["values"].append(value)
nselected = 1
return nselected
|
