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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.
200 lines
8.5 KiB
Python
200 lines
8.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ImportIntoPostGIS.py
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---------------------
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Date : October 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf 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__ = 'Victor Olaya'
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__date__ = 'October 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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 (QgsVectorLayerExporter,
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QgsSettings,
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QgsApplication,
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QgsFeatureSink,
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QgsProcessingUtils,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterString,
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QgsProcessingParameterField,
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QgsProcessingParameterBoolean,
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QgsWkbTypes)
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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 postgis
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class ImportIntoPostGIS(QgisAlgorithm):
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DATABASE = 'DATABASE'
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TABLENAME = 'TABLENAME'
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SCHEMA = 'SCHEMA'
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INPUT = 'INPUT'
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OVERWRITE = 'OVERWRITE'
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CREATEINDEX = 'CREATEINDEX'
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GEOMETRY_COLUMN = 'GEOMETRY_COLUMN'
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LOWERCASE_NAMES = 'LOWERCASE_NAMES'
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DROP_STRING_LENGTH = 'DROP_STRING_LENGTH'
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FORCE_SINGLEPART = 'FORCE_SINGLEPART'
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PRIMARY_KEY = 'PRIMARY_KEY'
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ENCODING = 'ENCODING'
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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(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Layer to import')))
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db_param = QgsProcessingParameterString(
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self.DATABASE,
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self.tr('Database (connection name)'))
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db_param.setMetadata({
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'widget_wrapper': {
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'class': 'processing.gui.wrappers_postgis.ConnectionWidgetWrapper'}})
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self.addParameter(db_param)
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schema_param = QgsProcessingParameterString(
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self.SCHEMA,
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self.tr('Schema (schema name)'), 'public', False, True)
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schema_param.setMetadata({
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'widget_wrapper': {
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'class': 'processing.gui.wrappers_postgis.SchemaWidgetWrapper',
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'connection_param': self.DATABASE}})
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self.addParameter(schema_param)
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table_param = QgsProcessingParameterString(
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self.TABLENAME,
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self.tr('Table to import to (leave blank to use layer name)'), '', False, True)
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table_param.setMetadata({
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'widget_wrapper': {
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'class': 'processing.gui.wrappers_postgis.TableWidgetWrapper',
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'schema_param': self.SCHEMA}})
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self.addParameter(table_param)
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self.addParameter(QgsProcessingParameterField(self.PRIMARY_KEY,
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self.tr('Primary key field'), None, self.INPUT, QgsProcessingParameterField.Any, False, True))
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self.addParameter(QgsProcessingParameterString(self.GEOMETRY_COLUMN,
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self.tr('Geometry column'), 'geom'))
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self.addParameter(QgsProcessingParameterString(self.ENCODING,
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self.tr('Encoding'), 'UTF-8',
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False, True))
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self.addParameter(QgsProcessingParameterBoolean(self.OVERWRITE,
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self.tr('Overwrite'), True))
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self.addParameter(QgsProcessingParameterBoolean(self.CREATEINDEX,
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self.tr('Create spatial index'), True))
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self.addParameter(QgsProcessingParameterBoolean(self.LOWERCASE_NAMES,
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self.tr('Convert field names to lowercase'), True))
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self.addParameter(QgsProcessingParameterBoolean(self.DROP_STRING_LENGTH,
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self.tr('Drop length constraints on character fields'), False))
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self.addParameter(QgsProcessingParameterBoolean(self.FORCE_SINGLEPART,
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self.tr('Create single-part geometries instead of multi-part'), False))
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def name(self):
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return 'importintopostgis'
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def displayName(self):
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return self.tr('Import into PostGIS')
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def processAlgorithm(self, parameters, context, feedback):
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connection = self.parameterAsString(parameters, self.DATABASE, context)
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db = postgis.GeoDB.from_name(connection)
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schema = self.parameterAsString(parameters, self.SCHEMA, context)
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overwrite = self.parameterAsBool(parameters, self.OVERWRITE, context)
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createIndex = self.parameterAsBool(parameters, self.CREATEINDEX, context)
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convertLowerCase = self.parameterAsBool(parameters, self.LOWERCASE_NAMES, context)
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dropStringLength = self.parameterAsBool(parameters, self.DROP_STRING_LENGTH, context)
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forceSinglePart = self.parameterAsBool(parameters, self.FORCE_SINGLEPART, context)
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primaryKeyField = self.parameterAsString(parameters, self.PRIMARY_KEY, context) or 'id'
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encoding = self.parameterAsString(parameters, self.ENCODING, context)
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source = self.parameterAsSource(parameters, self.INPUT, context)
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table = self.parameterAsString(parameters, self.TABLENAME, context)
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if table:
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table.strip()
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if not table or table == '':
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table = source.sourceName()
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table = table.replace('.', '_')
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table = table.replace(' ', '').lower()[0:62]
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providerName = 'postgres'
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geomColumn = self.parameterAsString(parameters, self.GEOMETRY_COLUMN, context)
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if not geomColumn:
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geomColumn = 'geom'
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options = {}
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if overwrite:
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options['overwrite'] = True
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if convertLowerCase:
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options['lowercaseFieldNames'] = True
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geomColumn = geomColumn.lower()
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if dropStringLength:
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options['dropStringConstraints'] = True
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if forceSinglePart:
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options['forceSinglePartGeometryType'] = True
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# Clear geometry column for non-geometry tables
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if source.wkbType() == QgsWkbTypes.NoGeometry:
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geomColumn = None
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uri = db.uri
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uri.setDataSource(schema, table, geomColumn, '', primaryKeyField)
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if encoding:
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options['fileEncoding'] = encoding
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exporter = QgsVectorLayerExporter(uri.uri(), providerName, source.fields(),
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source.wkbType(), source.sourceCrs(), overwrite, options)
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if exporter.errorCode() != QgsVectorLayerExporter.NoError:
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raise GeoAlgorithmExecutionException(
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self.tr('Error importing to PostGIS\n{0}').format(exporter.errorMessage()))
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, f in enumerate(features):
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if feedback.isCanceled():
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break
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if not exporter.addFeature(f, QgsFeatureSink.FastInsert):
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feedback.reportError(exporter.errorMessage())
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feedback.setProgress(int(current * total))
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exporter.flushBuffer()
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if exporter.errorCode() != QgsVectorLayerExporter.NoError:
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raise GeoAlgorithmExecutionException(
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self.tr('Error importing to PostGIS\n{0}').format(exporter.errorMessage()))
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if geomColumn and createIndex:
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db.create_spatial_index(table, schema, geomColumn)
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db.vacuum_analyze(table, schema)
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return {}
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def dbConnectionNames(self):
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settings = QgsSettings()
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settings.beginGroup('/PostgreSQL/connections/')
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return settings.childGroups()
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