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https://github.com/qgis/QGIS.git
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136 lines
4.3 KiB
Python
136 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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spatialite.py
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---------------------
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Date : November 2015
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Copyright : (C) 2015 by René-Luc Dhont
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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from builtins import str
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from builtins import object
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__author__ = 'René-Luc Dhont'
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__date__ = 'November 2015'
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__copyright__ = '(C) 2015, René-Luc Dhont'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from qgis.utils import spatialite_connect
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import sqlite3 as sqlite
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import re
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class DbError(Exception):
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def __init__(self, message, query=None):
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# Save error. funny that the variables are in utf-8
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self.message = str(message)
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self.query = (str(query) if query is not None else None)
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def __str__(self):
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return 'MESSAGE: %s\nQUERY: %s' % (self.message, self.query)
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class GeoDB(object):
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def __init__(self, uri=None):
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self.uri = uri
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self.dbname = uri.database()
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try:
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self.con = spatialite_connect(self.con_info())
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except (sqlite.InterfaceError, sqlite.OperationalError) as e:
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raise DbError(str(e))
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self.has_spatialite = self.check_spatialite()
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if not self.has_spatialite:
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self.has_spatialite = self.init_spatialite()
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def con_info(self):
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return str(self.dbname)
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def init_spatialite(self):
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# Get spatialite version
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c = self.con.cursor()
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try:
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self._exec_sql(c, u'SELECT spatialite_version()')
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rep = c.fetchall()
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v = [int(x) if x.isdigit() else x for x in re.findall("\d+|[a-zA-Z]+", rep[0][0])]
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# Add spatialite support
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if v >= [4, 1, 0]:
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# 4.1 and above
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sql = "SELECT initspatialmetadata(1)"
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else:
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# Under 4.1
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sql = "SELECT initspatialmetadata()"
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self._exec_sql_and_commit(sql)
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except:
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return False
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finally:
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self.con.close()
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try:
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self.con = spatialite_connect(self.con_info())
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except (sqlite.InterfaceError, sqlite.OperationalError) as e:
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raise DbError(str(e))
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return self.check_spatialite()
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def check_spatialite(self):
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try:
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c = self.con.cursor()
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self._exec_sql(c, u"SELECT CheckSpatialMetaData()")
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v = c.fetchone()[0]
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self.has_geometry_columns = v == 1 or v == 3
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self.has_spatialite4 = v == 3
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except Exception:
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self.has_geometry_columns = False
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self.has_spatialite4 = False
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self.has_geometry_columns_access = self.has_geometry_columns
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return self.has_geometry_columns
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def _exec_sql(self, cursor, sql):
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try:
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cursor.execute(sql)
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except (sqlite.Error, sqlite.ProgrammingError, sqlite.Warning, sqlite.InterfaceError, sqlite.OperationalError) as e:
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raise DbError(str(e), sql)
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def _exec_sql_and_commit(self, sql):
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"""Tries to execute and commit some action, on error it rolls
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back the change.
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"""
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try:
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c = self.con.cursor()
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self._exec_sql(c, sql)
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self.con.commit()
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except DbError:
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self.con.rollback()
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raise
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def create_spatial_index(self, table, geom_column='the_geom'):
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sql = u"SELECT CreateSpatialIndex(%s, %s)" % (self._quote(table), self._quote(geom_column))
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self._exec_sql_and_commit(sql)
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def _quote(self, identifier):
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"""Quote identifier."""
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# quote identifier, and double the double-quotes
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return u"'%s'" % identifier.replace("'", "''")
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