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ExecuteSQL.py
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ExecuteSQL.py
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# -*- coding: utf-8 -*-
"""
***************************************************************************
ExecuteSQL.py -- use virtual layers to execute SQL on any sources
---------------------
Date : Jan 2016
Copyright : (C) 2016 by Hugo Mercier
Email : hugo dot mercier at oslandia 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. *
* *
***************************************************************************
"""
__author__ = 'Hugo Mercier'
__date__ = 'January 2016'
__copyright__ = '(C) 2016, Hugo Mercier'
# This will get replaced with a git SHA1 when you do a git archive323
__revision__ = '$Format:%H$'
from qgis.core import (QgsVirtualLayerDefinition,
QgsVectorLayer,
QgsWkbTypes,
QgsProcessingAlgorithm,
QgsProcessingParameterMultipleLayers,
QgsProcessingParameterString,
QgsProcessingParameterEnum,
QgsProcessingParameterCrs,
QgsProcessingParameterFeatureSink,
QgsFeatureSink,
QgsProcessingException)
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
class ExecuteSQL(QgisAlgorithm):
""" This algorithm allows executing an SQL query on a set of input
vector layers thanks to the virtual layer provider
"""
INPUT_DATASOURCES = 'INPUT_DATASOURCES'
INPUT_QUERY = 'INPUT_QUERY'
INPUT_UID_FIELD = 'INPUT_UID_FIELD'
INPUT_GEOMETRY_FIELD = 'INPUT_GEOMETRY_FIELD'
INPUT_GEOMETRY_TYPE = 'INPUT_GEOMETRY_TYPE'
INPUT_GEOMETRY_CRS = 'INPUT_GEOMETRY_CRS'
OUTPUT = 'OUTPUT'
def group(self):
return self.tr('Vector general')
def groupId(self):
return 'vectorgeneral'
def __init__(self):
super().__init__()
def flags(self):
return super().flags() | QgsProcessingAlgorithm.FlagNoThreading
def initAlgorithm(self, config=None):
self.addParameter(QgsProcessingParameterMultipleLayers(name=self.INPUT_DATASOURCES,
description=self.tr('Additional input datasources (called input1, .., inputN in the query)'),
optional=True))
self.addParameter(QgsProcessingParameterString(name=self.INPUT_QUERY,
description=self.tr('SQL query'),
multiLine=True))
self.addParameter(QgsProcessingParameterString(name=self.INPUT_UID_FIELD,
description=self.tr('Unique identifier field'), optional=True))
self.addParameter(QgsProcessingParameterString(name=self.INPUT_GEOMETRY_FIELD,
description=self.tr('Geometry field'), optional=True))
self.geometryTypes = [
self.tr('Autodetect'),
self.tr('No geometry'),
'Point',
'LineString',
'Polygon',
'MultiPoint',
'MultiLineString',
'MultiPolygon']
self.addParameter(QgsProcessingParameterEnum(self.INPUT_GEOMETRY_TYPE,
self.tr('Geometry type'), options=self.geometryTypes, optional=True))
self.addParameter(QgsProcessingParameterCrs(self.INPUT_GEOMETRY_CRS,
self.tr('CRS'), optional=True))
self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('SQL Output')))
def name(self):
return 'executesql'
def displayName(self):
return self.tr('Execute SQL')
def processAlgorithm(self, parameters, context, feedback):
layers = self.parameterAsLayerList(parameters, self.INPUT_DATASOURCES, context)
query = self.parameterAsString(parameters, self.INPUT_QUERY, context)
uid_field = self.parameterAsString(parameters, self.INPUT_UID_FIELD, context)
geometry_field = self.parameterAsString(parameters, self.INPUT_GEOMETRY_FIELD, context)
geometry_type = self.parameterAsEnum(parameters, self.INPUT_GEOMETRY_TYPE, context)
geometry_crs = self.parameterAsCrs(parameters, self.INPUT_GEOMETRY_CRS, context)
df = QgsVirtualLayerDefinition()
for layerIdx, layer in enumerate(layers):
df.addSource('input{}'.format(layerIdx + 1), layer.id())
if query == '':
raise QgsProcessingException(
self.tr('Empty SQL. Please enter valid SQL expression and try again.'))
else:
df.setQuery(query)
if uid_field:
df.setUid(uid_field)
if geometry_type == 1: # no geometry
df.setGeometryWkbType(QgsWkbTypes.NullGeometry)
else:
if geometry_field:
df.setGeometryField(geometry_field)
if geometry_type > 1:
df.setGeometryWkbType(geometry_type - 1)
if geometry_crs.isValid():
df.setGeometrySrid(geometry_crs.postgisSrid())
vLayer = QgsVectorLayer(df.toString(), "temp_vlayer", "virtual")
if not vLayer.isValid():
raise QgsProcessingException(vLayer.dataProvider().error().message())
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
vLayer.fields(), vLayer.wkbType() if geometry_type != 1 else 1, vLayer.crs())
features = vLayer.getFeatures()
total = 100.0 / vLayer.featureCount() if vLayer.featureCount() else 0
for current, inFeat in enumerate(features):
if feedback.isCanceled():
break
sink.addFeature(inFeat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
return {self.OUTPUT: dest_id}