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"""
/***************************************************************************
Name : DB Manager
Description : Database manager plugin for QGIS
Date : Oct 13, 2011
copyright : (C) 2011 by Giuseppe Sucameli
email : brush.tyler@gmail.com
The content of this file is based on
- PG_Manager by Martin Dobias (GPLv2 license)
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
"""
from qgis.PyQt import uic
from qgis.PyQt.QtCore import Qt, QFileInfo
from qgis.PyQt.QtWidgets import QDialog, QFileDialog, QMessageBox, QApplication
from qgis.PyQt.QtGui import QCursor
from qgis.core import (
QgsVectorFileWriter,
QgsVectorDataProvider,
QgsCoordinateReferenceSystem,
QgsVectorLayerExporter,
QgsSettings,
)
from qgis.utils import OverrideCursor
from .gui_utils import GuiUtils
Ui_Dialog, _ = uic.loadUiType(GuiUtils.get_ui_file_path("DlgExportVector.ui"))
class DlgExportVector(QDialog, Ui_Dialog):
def __init__(self, inLayer, inDb, parent=None):
QDialog.__init__(self, parent)
self.inLayer = inLayer
self.db = inDb
self.setupUi(self)
vectorFilterName = "lastVectorFileFilter" # "lastRasterFileFilter"
self.lastUsedVectorFilterSettingsKey = f"/UI/{vectorFilterName}"
self.lastUsedVectorDirSettingsKey = f"/UI/{vectorFilterName}Dir"
# update UI
self.setupWorkingMode()
self.populateFileFilters()
self.populateEncodings()
def setupWorkingMode(self):
# set default values
inCrs = self.inLayer.crs()
srid = inCrs.postgisSrid() if inCrs.isValid() else 4236
self.editSourceSrid.setText("%s" % srid)
self.editTargetSrid.setText("%s" % srid)
self.btnChooseOutputFile.clicked.connect(self.chooseOutputFile)
self.checkSupports()
def checkSupports(self):
"""update options available for the current input layer"""
allowSpatial = self.db.connector.hasSpatialSupport()
hasGeomType = self.inLayer and self.inLayer.isSpatial()
self.chkSourceSrid.setEnabled(allowSpatial and hasGeomType)
self.chkTargetSrid.setEnabled(allowSpatial and hasGeomType)
# self.chkSpatialIndex.setEnabled(allowSpatial and hasGeomType)
def chooseOutputFile(self):
# get last used dir
settings = QgsSettings()
lastUsedDir = settings.value(self.lastUsedVectorDirSettingsKey, ".")
# get selected filter
selected_driver = self.cboFileFormat.currentData()
selected_filter = QgsVectorFileWriter.filterForDriver(selected_driver)
# ask for a filename
filename, filter = QFileDialog.getSaveFileName(
self, self.tr("Choose where to save the file"), lastUsedDir, selected_filter
)
if filename == "":
return
ext = selected_filter[selected_filter.find(".") :]
ext = ext[: ext.find(" ")]
if not filename.lower().endswith(ext):
filename += ext
# store the last used dir
settings.setValue(
self.lastUsedVectorDirSettingsKey, QFileInfo(filename).filePath()
)
self.editOutputFile.setText(filename)
def populateEncodings(self):
# populate the combo with supported encodings
self.cboEncoding.addItems(QgsVectorDataProvider.availableEncodings())
# set the last used encoding
enc = self.inLayer.dataProvider().encoding()
idx = self.cboEncoding.findText(enc)
if idx < 0:
self.cboEncoding.insertItem(0, enc)
idx = 0
self.cboEncoding.setCurrentIndex(idx)
def populateFileFilters(self):
# populate the combo with supported vector file formats
for driver in QgsVectorFileWriter.ogrDriverList():
self.cboFileFormat.addItem(driver.longName, driver.driverName)
# set the last used filter
settings = QgsSettings()
filt = settings.value(self.lastUsedVectorFilterSettingsKey, "GPKG")
idx = self.cboFileFormat.findText(filt)
if idx < 0:
idx = 0
self.cboFileFormat.setCurrentIndex(idx)
def accept(self):
# sanity checks
if self.editOutputFile.text() == "":
QMessageBox.information(
self, self.tr("Export to file"), self.tr("Output file name is required")
)
return
if self.chkSourceSrid.isEnabled() and self.chkSourceSrid.isChecked():
try:
sourceSrid = int(self.editSourceSrid.text())
except ValueError:
QMessageBox.information(
self,
self.tr("Export to file"),
self.tr("Invalid source srid: must be an integer"),
)
return
if self.chkTargetSrid.isEnabled() and self.chkTargetSrid.isChecked():
try:
targetSrid = int(self.editTargetSrid.text())
except ValueError:
QMessageBox.information(
self,
self.tr("Export to file"),
self.tr("Invalid target srid: must be an integer"),
)
return
with OverrideCursor(Qt.CursorShape.WaitCursor):
# store current input layer crs, so I can restore it later
prevInCrs = self.inLayer.crs()
try:
uri = self.editOutputFile.text()
providerName = "ogr"
options = {}
# set the OGR driver will be used
driverName = self.cboFileFormat.currentData()
options["driverName"] = driverName
# set the output file encoding
if self.chkEncoding.isEnabled() and self.chkEncoding.isChecked():
enc = self.cboEncoding.currentText()
options["fileEncoding"] = enc
if self.chkDropTable.isChecked():
options["overwrite"] = True
outCrs = QgsCoordinateReferenceSystem()
if self.chkTargetSrid.isEnabled() and self.chkTargetSrid.isChecked():
targetSrid = int(self.editTargetSrid.text())
outCrs = QgsCoordinateReferenceSystem(targetSrid)
# update input layer crs
if self.chkSourceSrid.isEnabled() and self.chkSourceSrid.isChecked():
sourceSrid = int(self.editSourceSrid.text())
inCrs = QgsCoordinateReferenceSystem(sourceSrid)
self.inLayer.setCrs(inCrs)
# do the export!
ret, errMsg = QgsVectorLayerExporter.exportLayer(
self.inLayer, uri, providerName, outCrs, False, options
)
except Exception as e:
ret = -1
errMsg = str(e)
finally:
# restore input layer crs and encoding
self.inLayer.setCrs(prevInCrs)
if ret != 0:
QMessageBox.warning(
self,
self.tr("Export to file"),
self.tr("Error {0}\n{1}").format(ret, errMsg),
)
return
# create spatial index
# if self.chkSpatialIndex.isEnabled() and self.chkSpatialIndex.isChecked():
# self.db.connector.createSpatialIndex( (schema, table), geom )
QMessageBox.information(
self, self.tr("Export to file"), self.tr("Export finished.")
)
return QDialog.accept(self)
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