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Since it's safe to evaluate parameters in background threads now, it's usually going to be ok to evaluate everything in the processAlgorithm step. This keeps the algorithm code as simple as possible, and will make porting faster. Note that the prepare/postProcess virtual methods still exist and can be used when an algorithm MUST do setup/cleanup work in the main thread.
75 lines
2.8 KiB
Python
75 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SpatialiteExecuteSQL.py
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---------------------
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Date : October 2016
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Copyright : (C) 2016 by Mathieu Pellerin
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Email : nirvn dot asia 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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__author__ = 'Mathieu Pellerin'
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__date__ = 'October 2016'
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__copyright__ = '(C) 2016, Mathieu Pellerin'
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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.core import (QgsDataSourceUri,
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QgsApplication,
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QgsProcessingParameterVectorLayer,
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QgsProcessingParameterString)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.tools import spatialite
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class SpatialiteExecuteSQL(QgisAlgorithm):
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DATABASE = 'DATABASE'
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SQL = 'SQL'
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def group(self):
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return self.tr('Database')
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def __init__(self):
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super().__init__()
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self.addParameter(QgsProcessingParameterVectorLayer(self.DATABASE, self.tr('File Database'), False, False))
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self.addParameter(QgsProcessingParameterString(self.SQL, self.tr('SQL query'), '', True))
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def name(self):
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return 'spatialiteexecutesql'
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def displayName(self):
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return self.tr('Spatialite execute SQL')
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def processAlgorithm(self, parameters, context, feedback):
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database = self.parameterAsVectorLayer(parameters, self.DATABASE, context)
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databaseuri = database.dataProvider().dataSourceUri()
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uri = QgsDataSourceUri(databaseuri)
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if uri.database() is '':
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if '|layerid' in databaseuri:
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databaseuri = databaseuri[:databaseuri.find('|layerid')]
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uri = QgsDataSourceUri('dbname=\'%s\'' % (databaseuri))
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db = spatialite.GeoDB(uri)
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sql = self.parameterAsString(parameters, self.SQL, context).replace('\n', ' ')
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try:
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db._exec_sql_and_commit(str(sql))
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except spatialite.DbError as e:
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raise GeoAlgorithmExecutionException(
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self.tr('Error executing SQL:\n{0}').format(str(e)))
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return {}
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