mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-10 00:04:23 -04:00
126 lines
4.9 KiB
Python
126 lines
4.9 KiB
Python
"""
|
|
***************************************************************************
|
|
PostGISExecuteAndLoadSQL.py
|
|
---------------------
|
|
Date : May 2018
|
|
Copyright : (C) 2018 by Anita Graser
|
|
Email : anitagraser at gmx dot at
|
|
---------------------
|
|
based on PostGISExecuteSQL.py by Victor Olaya and Carterix Geomatics
|
|
***************************************************************************
|
|
* *
|
|
* 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__ = 'Anita Graser'
|
|
__date__ = 'May 2018'
|
|
__copyright__ = '(C) 2018, Anita Graser'
|
|
|
|
from qgis.core import (QgsProcessingException,
|
|
QgsProcessingParameterString,
|
|
QgsVectorLayer,
|
|
QgsDataSourceUri,
|
|
QgsProcessing,
|
|
QgsProcessingOutputVectorLayer,
|
|
QgsProcessingContext,
|
|
QgsProcessingParameterProviderConnection,
|
|
QgsProviderRegistry,
|
|
QgsProviderConnectionException,
|
|
QgsProcessingAlgorithm
|
|
)
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
|
|
|
|
class PostGISExecuteAndLoadSQL(QgisAlgorithm):
|
|
DATABASE = 'DATABASE'
|
|
SQL = 'SQL'
|
|
OUTPUT = 'OUTPUT'
|
|
ID_FIELD = 'ID_FIELD'
|
|
GEOMETRY_FIELD = 'GEOMETRY_FIELD'
|
|
|
|
def group(self):
|
|
return self.tr('Database')
|
|
|
|
def groupId(self):
|
|
return 'database'
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
def flags(self):
|
|
return super().flags() | QgsProcessingAlgorithm.Flag.FlagNotAvailableInStandaloneTool | QgsProcessingAlgorithm.Flag.FlagRequiresProject
|
|
|
|
def initAlgorithm(self, config=None):
|
|
db_param = QgsProcessingParameterProviderConnection(
|
|
self.DATABASE,
|
|
self.tr('Database (connection name)'), 'postgres')
|
|
self.addParameter(db_param)
|
|
self.addParameter(QgsProcessingParameterString(
|
|
self.SQL,
|
|
self.tr('SQL query'),
|
|
multiLine=True))
|
|
self.addParameter(QgsProcessingParameterString(
|
|
self.ID_FIELD,
|
|
self.tr('Unique ID field name'),
|
|
defaultValue='id'))
|
|
self.addParameter(QgsProcessingParameterString(
|
|
self.GEOMETRY_FIELD,
|
|
self.tr('Geometry field name'),
|
|
defaultValue='geom',
|
|
optional=True))
|
|
self.addOutput(QgsProcessingOutputVectorLayer(
|
|
self.OUTPUT,
|
|
self.tr("Output layer"),
|
|
QgsProcessing.SourceType.TypeVectorAnyGeometry))
|
|
|
|
def name(self):
|
|
return 'postgisexecuteandloadsql'
|
|
|
|
def displayName(self):
|
|
return self.tr('PostgreSQL execute and load SQL')
|
|
|
|
def shortDescription(self):
|
|
return self.tr('Executes a SQL command on a PostgreSQL database and loads the result as a table')
|
|
|
|
def tags(self):
|
|
return self.tr('postgis,table,database').split(',')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
connection_name = self.parameterAsConnectionName(parameters, self.DATABASE, context)
|
|
id_field = self.parameterAsString(parameters, self.ID_FIELD, context)
|
|
geom_field = self.parameterAsString(
|
|
parameters, self.GEOMETRY_FIELD, context)
|
|
|
|
# resolve connection details to uri
|
|
try:
|
|
md = QgsProviderRegistry.instance().providerMetadata('postgres')
|
|
conn = md.createConnection(connection_name)
|
|
except QgsProviderConnectionException:
|
|
raise QgsProcessingException(self.tr('Could not retrieve connection details for {}').format(connection_name))
|
|
|
|
uri = QgsDataSourceUri(conn.uri())
|
|
|
|
sql = self.parameterAsString(parameters, self.SQL, context)
|
|
sql = sql.replace('\n', ' ')
|
|
uri.setDataSource("", "(" + sql.rstrip(';') + ")", geom_field, "", id_field)
|
|
|
|
vlayer = QgsVectorLayer(uri.uri(), "layername", "postgres")
|
|
|
|
if not vlayer.isValid():
|
|
raise QgsProcessingException(self.tr("""This layer is invalid!
|
|
Please check the PostGIS log for error messages."""))
|
|
|
|
context.temporaryLayerStore().addMapLayer(vlayer)
|
|
context.addLayerToLoadOnCompletion(
|
|
vlayer.id(),
|
|
QgsProcessingContext.LayerDetails('SQL layer',
|
|
context.project(),
|
|
self.OUTPUT))
|
|
|
|
return {self.OUTPUT: vlayer.id()}
|