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# -*- coding: utf-8 -*-
"""
/***************************************************************************
Name : Virtual layers plugin for DB Manager
Date : December 2015
copyright : (C) 2015 by Hugo Mercier
email : hugo dot mercier at oslandia dot com
***************************************************************************/
/***************************************************************************
* *
* 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 ..data_model import (TableDataModel,
BaseTableModel,
SqlResultModelAsync,
SqlResultModelTask)
from .connector import VLayerRegistry, getQueryGeometryName
from .plugin import LVectorTable
from ..plugin import DbError, BaseError
from qgis.PyQt.QtCore import QTime, QTemporaryFile
from qgis.core import (QgsVectorLayer,
QgsWkbTypes,
QgsVirtualLayerDefinition,
QgsVirtualLayerTask,
QgsTask)
class LTableDataModel(TableDataModel):
def __init__(self, table, parent=None):
TableDataModel.__init__(self, table, parent)
self.layer = None
if isinstance(table, LVectorTable):
self.layer = VLayerRegistry.instance().getLayer(table.name)
else:
self.layer = VLayerRegistry.instance().getLayer(table)
if not self.layer:
return
# populate self.resdata
self.resdata = []
for f in self.layer.getFeatures():
a = f.attributes()
# add the geometry type
if f.hasGeometry():
a.append(QgsWkbTypes.displayString(f.geometry().wkbType()))
else:
a.append('None')
self.resdata.append(a)
self.fetchedFrom = 0
self.fetchedCount = len(self.resdata)
def rowCount(self, index=None):
if self.layer:
return self.layer.featureCount()
return 0
class LSqlResultModelTask(SqlResultModelTask):
def __init__(self, db, sql, parent):
super().__init__(db, sql, parent)
tf = QTemporaryFile()
tf.open()
path = tf.fileName()
tf.close()
df = QgsVirtualLayerDefinition()
df.setFilePath(path)
df.setQuery(sql)
self.subtask = QgsVirtualLayerTask(df)
self.addSubTask(self.subtask, [], QgsTask.ParentDependsOnSubTask)
def run(self):
try:
path = self.subtask.definition().filePath()
sql = self.subtask.definition().query()
self.model = LSqlResultModel(self.db, sql, None, self.subtask.layer(), path)
except Exception as e:
self.error = BaseError(str(e))
return False
return True
def cancel(self):
SqlResultModelTask.cancel(self)
class LSqlResultModelAsync(SqlResultModelAsync):
def __init__(self, db, sql, parent=None):
super().__init__()
self.task = LSqlResultModelTask(db, sql, parent)
self.task.taskCompleted.connect(self.modelDone)
self.task.taskTerminated.connect(self.modelDone)
def modelDone(self):
self.status = self.task.status
self.model = self.task.model
if self.task.subtask.exceptionText():
self.error = BaseError(self.task.subtask.exceptionText())
self.done.emit()
class LSqlResultModel(BaseTableModel):
def __init__(self, db, sql, parent=None, layer=None, path=None):
t = QTime()
t.start()
if not layer:
tf = QTemporaryFile()
tf.open()
path = tf.fileName()
tf.close()
df = QgsVirtualLayerDefinition()
df.setFilePath(path)
df.setQuery(sql)
layer = QgsVectorLayer(df.toString(), "vv", "virtual")
self._secs = t.elapsed() / 1000.0
data = []
header = []
if not layer.isValid():
raise DbError(layer.dataProvider().error().summary(), sql)
else:
header = [f.name() for f in layer.fields()]
has_geometry = False
if layer.geometryType() != QgsWkbTypes.NullGeometry:
gn = getQueryGeometryName(path)
if gn:
has_geometry = True
header += [gn]
for f in layer.getFeatures():
a = f.attributes()
if has_geometry:
if f.hasGeometry():
a += [f.geometry().asWkt()]
else:
a += [None]
data += [a]
self._secs = 0
self._affectedRows = len(data)
BaseTableModel.__init__(self, header, data, parent)
def secs(self):
return self._secs
def affectedRows(self):
return self._affectedRows
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