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# -*- coding: utf-8 -*-
"""
/***************************************************************************
Name : DB Manager
Description : Database manager plugin for QGIS
Date : May 23, 2011
copyright : (C) 2011 by Giuseppe Sucameli
email : brush.tyler@gmail.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 qgis.core import QgsMessageLog
from ..plugin import BaseError
from ..data_model import (TableDataModel,
SqlResultModel,
SqlResultModelAsync,
SqlResultModelTask)
class PGTableDataModel(TableDataModel):
def __init__(self, table, parent=None):
self.cursor = None
TableDataModel.__init__(self, table, parent)
if self.table.rowCount is None:
self.table.refreshRowCount()
if self.table.rowCount is None:
return
self.table.aboutToChange.connect(self._deleteCursor)
self._createCursor()
def _createCursor(self):
fields_txt = u", ".join(self.fields)
table_txt = self.db.quoteId((self.table.schemaName(), self.table.name))
self.cursor = self.db._get_cursor()
sql = u"SELECT %s FROM %s" % (fields_txt, table_txt)
self.db._execute(self.cursor, sql)
def _sanitizeTableField(self, field):
# get fields, ignore geometry columns
if field.dataType.lower() == "geometry":
return u"CASE WHEN %(fld)s IS NULL THEN NULL ELSE GeometryType(%(fld)s) END AS %(fld)s" % {
'fld': self.db.quoteId(field.name)}
elif field.dataType.lower() == "raster":
return u"CASE WHEN %(fld)s IS NULL THEN NULL ELSE 'RASTER' END AS %(fld)s" % {
'fld': self.db.quoteId(field.name)}
return u"%s::text" % self.db.quoteId(field.name)
def _deleteCursor(self):
self.db._close_cursor(self.cursor)
self.cursor = None
def __del__(self):
self.table.aboutToChange.disconnect(self._deleteCursor)
self._deleteCursor()
pass # print "PGTableModel.__del__"
def fetchMoreData(self, row_start):
if not self.cursor:
self._createCursor()
try:
self.cursor.scroll(row_start, mode='absolute')
except self.db.error_types():
self._deleteCursor()
return self.fetchMoreData(row_start)
self.resdata = self.cursor.fetchmany(self.fetchedCount)
self.fetchedFrom = row_start
class PGSqlResultModelTask(SqlResultModelTask):
def __init__(self, db, sql, parent):
super().__init__(db, sql, parent)
def run(self):
try:
self.model = PGSqlResultModel(self.db, self.sql, None)
except BaseError as e:
self.error = e
QgsMessageLog.logMessage(e.msg)
return False
return True
def cancel(self):
self.db.connector.cancel()
SqlResultModelTask.cancel(self)
class PGSqlResultModelAsync(SqlResultModelAsync):
def __init__(self, db, sql, parent):
super().__init__()
self.task = PGSqlResultModelTask(db, sql, parent)
self.task.taskCompleted.connect(self.modelDone)
self.task.taskTerminated.connect(self.modelDone)
class PGSqlResultModel(SqlResultModel):
pass
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