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