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a05d941e4e
Since the underlying issues with the Python bindings are now fixed, in most cases we can safely default to allowing an algorithm to run in a background thread!! So now we make this the default, and require individual algorithms which are NOT thread safe to declare this. This includes algorithms which directly manipulate the current project or layers (such as setting layer styles), alter the selections in layers, or which rely on 3rd party libraries (for now, SAGA and GRASS algorithms are marked as not thread safe... TODO - someone more familiar with these libraries can investigate and remove the flag if appropriate). Also models are marked as non-thread safe. TODO: only flag an individual model as thread-unsafe if any of its child algorithms report this flag.
84 lines
3.1 KiB
Python
84 lines
3.1 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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__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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QgsProcessingAlgorithm,
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QgsProcessingException,
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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.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 groupId(self):
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return 'database'
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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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 flags(self):
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return super().flags() | QgsProcessingAlgorithm.FlagNoThreading
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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 '|layername' in databaseuri:
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databaseuri = databaseuri[:databaseuri.find('|layername')]
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elif '|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 QgsProcessingException(
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self.tr('Error executing SQL:\n{0}').format(str(e)))
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return {}
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