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131 lines
4.3 KiB
Python
131 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ogrsql.py
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---------------------
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Date : November 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__ = 'November 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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import string
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import re
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try:
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from osgeo import ogr
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ogrAvailable = True
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except:
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ogrAvailable = False
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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from qgis.core import *
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from processing.core.ProcessingLog import ProcessingLog
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from processing.parameters.ParameterVector import ParameterVector
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from processing.parameters.ParameterString import ParameterString
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from processing.outputs.OutputHTML import OutputHTML
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from OgrAlgorithm import OgrAlgorithm
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class OgrSql(OgrAlgorithm):
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OUTPUT = 'OUTPUT'
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INPUT_LAYER = 'INPUT_LAYER'
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SQL = 'SQL'
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def defineCharacteristics(self):
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self.name = 'Execute SQL'
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self.group = '[OGR] Miscellaneous'
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self.addParameter(ParameterVector(self.INPUT_LAYER, 'Input layer',
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[ParameterVector.VECTOR_TYPE_ANY], False))
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self.addParameter(ParameterString(self.SQL, 'SQL', ''))
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self.addOutput(OutputHTML(self.OUTPUT, 'SQL result'))
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def processAlgorithm(self, progress):
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if not ogrAvailable:
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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'OGR bindings not installed')
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return
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input = self.getParameterValue(self.INPUT_LAYER)
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sql = self.getParameterValue(self.SQL)
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ogrLayer = self.ogrConnectionString(input)
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output = self.getOutputValue(self.OUTPUT)
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qDebug("Opening data source '%s'" % ogrLayer)
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poDS = ogr.Open(ogrLayer, False)
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if poDS is None:
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.failure(ogrLayer))
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return
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result = self.select_values(poDS, sql)
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f = open(output, 'w')
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f.write('<table>')
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for row in result:
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f.write('<tr>')
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for col in row:
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f.write('<td>' + col + '</td>')
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f.write('</tr>')
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f.write('</table>')
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f.close()
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def execute_sql(self, ds, sql_statement):
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poResultSet = ds.ExecuteSQL(sql_statement, None, None)
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if poResultSet is not None:
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ds.ReleaseResultSet(poResultSet)
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def select_values(self, ds, sql_statement):
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"""Returns an array of the columns and values of SELECT
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statement:
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select_values(ds, "SELECT id FROM companies") => [['id'],[1],[2],[3]]
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"""
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poResultSet = ds.ExecuteSQL(sql_statement, None, None)
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# TODO: Redirect error messages
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fields = []
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rows = []
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if poResultSet is not None:
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poDefn = poResultSet.GetLayerDefn()
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for iField in range(poDefn.GetFieldCount()):
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poFDefn = poDefn.GetFieldDefn(iField)
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fields.append(poFDefn.GetNameRef())
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poFeature = poResultSet.GetNextFeature()
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while poFeature is not None:
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values = []
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for iField in range(poDefn.GetFieldCount()):
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if poFeature.IsFieldSet(iField):
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values.append(poFeature.GetFieldAsString(iField))
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else:
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values.append('(null)')
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rows.append(values)
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poFeature = poResultSet.GetNextFeature()
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ds.ReleaseResultSet(poResultSet)
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return [fields] + rows
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