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Merge pull request #3650 from nirvn/processing_spatialite_sql

[processing] add a "Spatialite execute SQL" algorithm
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alexbruy committed Oct 21, 2016
2 parents 2b9f475 + d83e650 commit bde0f6ee2ef60fe4d17a38a2fc7e7e5f43c1e6b3
@@ -333,6 +333,9 @@ qgis:polygonize: >
qgis:polygonstolines: >
This algorithm takes a polygon layer and creates a line layer, with lines representing the rings of the polygons in the input layer.

qgis:spatialiteexecutesql: >
This algorithm performs a SQL database query on a Spatialite database.

qgis:postgisexecutesql: >
This algorithm performs a SQL database query on a PostGIS database connected to QGIS.

@@ -131,6 +131,7 @@
from .RandomPointsPolygonsVariable import RandomPointsPolygonsVariable
from .RandomPointsAlongLines import RandomPointsAlongLines
from .PointsToPaths import PointsToPaths
from .SpatialiteExecuteSQL import SpatialiteExecuteSQL
from .PostGISExecuteSQL import PostGISExecuteSQL
from .ImportIntoPostGIS import ImportIntoPostGIS
from .SetVectorStyle import SetVectorStyle
@@ -213,6 +214,7 @@ def __init__(self):
RandomPointsLayer(), RandomPointsPolygonsFixed(),
RandomPointsAlongLines(), PointsToPaths(),
PostGISExecuteSQL(), ImportIntoPostGIS(),
SetVectorStyle(), SetRasterStyle(),
SelectByExpression(), HypsometricCurves(),
@@ -0,0 +1,62 @@
# -*- coding: utf-8 -*-

Date : October 2016
Copyright : (C) 2016 by Mathieu Pellerin
Email : nirvn dot asia at gmail dot com
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
from builtins import str

__author__ = 'Mathieu Pellerin'
__date__ = 'October 2016'
__copyright__ = '(C) 2016, Mathieu Pellerin'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'

from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterString
from import spatialite

from qgis.core import QgsDataSourceUri, QgsMessageLog

class SpatialiteExecuteSQL(GeoAlgorithm):


def defineCharacteristics(self):, self.i18n_name = self.trAlgorithm('Spatialite execute SQL'), self.i18n_group = self.trAlgorithm('Database')
self.addParameter(ParameterVector(self.DATABASE,'File Database'), False, False))
self.addParameter(ParameterString(self.SQL,'SQL query'), '', True))

def processAlgorithm(self, progress):
database = self.getParameterValue(self.DATABASE)
uri = QgsDataSourceUri(database)
if uri.database() is '':
if '|layerid' in database:
database = database[:database.find('|layerid')]
uri = QgsDataSourceUri('dbname=\'%s\'' % (database))
self.db = spatialite.GeoDB(uri)
sql = self.getParameterValue(self.SQL).replace('\n', ' ')
except spatialite.DbError as e:
raise GeoAlgorithmExecutionException('Error executing SQL:\n%s') % str(e))
@@ -29,13 +29,15 @@

from qgis.utils import spatialite_connect

import sqlite3 as sqlite

class DbError(Exception):

def __init__(self, message, query=None):
# Save error. funny that the variables are in utf-8
self.message = str(message, 'utf-8')
self.query = (str(query, 'utf-8') if query is not None else None)
self.message = str(message)
self.query = (str(query) if query is not None else None)

def __str__(self):
return 'MESSAGE: %s\nQUERY: %s' % (self.message, self.query)

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