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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
188 lines
7.3 KiB
Python
188 lines
7.3 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 (QgsVectorLayerImport,
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QgsSettings,
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QgsApplication)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterBoolean
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterString
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from processing.core.parameters import ParameterTableField
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from processing.tools import dataobjects, postgis
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class ImportIntoPostGIS(GeoAlgorithm):
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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 icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def group(self):
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return self.tr('Database')
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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 defineCharacteristics(self):
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Layer to import')))
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self.addParameter(ParameterString(
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self.DATABASE,
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self.tr('Database (connection name)'),
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metadata={
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'widget_wrapper': {
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'class': 'processing.gui.wrappers_postgis.ConnectionWidgetWrapper'}}))
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self.addParameter(ParameterString(
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self.SCHEMA,
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self.tr('Schema (schema name)'),
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'public',
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optional=True,
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metadata={
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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(ParameterString(
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self.TABLENAME,
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self.tr('Table to import to (leave blank to use layer name)'),
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'',
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optional=True,
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metadata={
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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(ParameterTableField(self.PRIMARY_KEY,
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self.tr('Primary key field'), self.INPUT, optional=True))
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self.addParameter(ParameterString(self.GEOMETRY_COLUMN,
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self.tr('Geometry column'), 'geom'))
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self.addParameter(ParameterString(self.ENCODING,
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self.tr('Encoding'), 'UTF-8',
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optional=True))
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self.addParameter(ParameterBoolean(self.OVERWRITE,
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self.tr('Overwrite'), True))
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self.addParameter(ParameterBoolean(self.CREATEINDEX,
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self.tr('Create spatial index'), True))
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self.addParameter(ParameterBoolean(self.LOWERCASE_NAMES,
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self.tr('Convert field names to lowercase'), True))
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self.addParameter(ParameterBoolean(self.DROP_STRING_LENGTH,
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self.tr('Drop length constraints on character fields'), False))
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self.addParameter(ParameterBoolean(self.FORCE_SINGLEPART,
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self.tr('Create single-part geometries instead of multi-part'), False))
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def processAlgorithm(self, context, feedback):
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connection = self.getParameterValue(self.DATABASE)
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db = postgis.GeoDB.from_name(connection)
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schema = self.getParameterValue(self.SCHEMA)
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overwrite = self.getParameterValue(self.OVERWRITE)
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createIndex = self.getParameterValue(self.CREATEINDEX)
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convertLowerCase = self.getParameterValue(self.LOWERCASE_NAMES)
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dropStringLength = self.getParameterValue(self.DROP_STRING_LENGTH)
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forceSinglePart = self.getParameterValue(self.FORCE_SINGLEPART)
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primaryKeyField = self.getParameterValue(self.PRIMARY_KEY) or 'id'
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encoding = self.getParameterValue(self.ENCODING)
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layerUri = self.getParameterValue(self.INPUT)
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(layerUri, context)
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table = self.getParameterValue(self.TABLENAME)
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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 = layer.name()
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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.getParameterValue(self.GEOMETRY_COLUMN)
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if not geomColumn:
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geomColumn = 'the_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 not layer.hasGeometryType():
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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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layer.setProviderEncoding(encoding)
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(ret, errMsg) = QgsVectorLayerImport.importLayer(
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layer,
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uri.uri(),
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providerName,
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self.crs,
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False,
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False,
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options,
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)
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if ret != 0:
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raise GeoAlgorithmExecutionException(
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self.tr('Error importing to PostGIS\n{0}').format(errMsg))
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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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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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