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[processing] add a spatialite execute SQL algorithm

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nirvn committed Oct 21, 2016
1 parent 89fa21e commit 772f2019c1bd869e5e76576104042fb0de9b86b8
@@ -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(),
RandomPointsPolygonsVariable(),
RandomPointsAlongLines(), PointsToPaths(),
SpatialiteExecuteSQL(),
PostGISExecuteSQL(), ImportIntoPostGIS(),
SetVectorStyle(), SetRasterStyle(),
SelectByExpression(), HypsometricCurves(),
@@ -0,0 +1,62 @@
# -*- coding: utf-8 -*-

"""
***************************************************************************
SpatialiteExecuteSQL.py
---------------------
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 processing.tools import spatialite

from qgis.core import QgsDataSourceUri, QgsMessageLog


class SpatialiteExecuteSQL(GeoAlgorithm):

DATABASE = 'DATABASE'
SQL = 'SQL'

def defineCharacteristics(self):
self.name, self.i18n_name = self.trAlgorithm('Spatialite execute SQL')
self.group, self.i18n_group = self.trAlgorithm('Database')
self.addParameter(ParameterVector(self.DATABASE, self.tr('File Database'), False, False))
self.addParameter(ParameterString(self.SQL, self.tr('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', ' ')
try:
self.db._exec_sql_and_commit(str(sql))
except spatialite.DbError as e:
raise GeoAlgorithmExecutionException(
self.tr('Error executing SQL:\n%s') % str(e))

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