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"""
/***************************************************************************
Name : DB Manager
Description : Database manager plugin for QGIS (Oracle)
Date : Aug 27, 2014
copyright : (C) 2014 by Médéric RIBREUX
email : mederic.ribreux@gmail.com
The content of this file is based on
- PG_Manager by Martin Dobias <wonder.sk@gmail.com> (GPLv2 license)
- DB Manager by Giuseppe Sucameli <brush.tyler@gmail.com> (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.QtCore import QElapsedTimer
from qgis.core import QgsMessageLog
from ..data_model import (
TableDataModel,
SqlResultModel,
SqlResultModelAsync,
SqlResultModelTask,
BaseTableModel,
)
from ..plugin import DbError
from ..plugin import BaseError
class ORTableDataModel(TableDataModel):
def __init__(self, table, parent=None):
self.cursor = None
TableDataModel.__init__(self, table, parent)
if not self.table.rowCount:
self.table.refreshRowCount()
self.table.aboutToChange.connect(self._deleteCursor)
self._createCursor()
def _createCursor(self):
fields_txt = ", ".join(self.fields)
table_txt = self.db.quoteId((self.table.schemaName(), self.table.name))
self.cursor = self.db._get_cursor()
sql = f"SELECT {fields_txt} FROM {table_txt}"
self.db._execute(self.cursor, sql)
def _sanitizeTableField(self, field):
# get fields, ignore geometry columns
if field.dataType.upper() == "SDO_GEOMETRY":
return (
"CASE WHEN {0} IS NULL THEN NULL ELSE 'GEOMETRY'"
"END AS {0}".format(self.db.quoteId(field.name))
)
if field.dataType.upper() == "DATE":
return f"CAST({self.db.quoteId(field.name)} AS VARCHAR2(8))"
if "TIMESTAMP" in field.dataType.upper():
return "TO_CHAR({}, 'YYYY-MM-DD HH:MI:SS.FF')".format(
self.db.quoteId(field.name)
)
if field.dataType.upper() == "NUMBER":
if not field.charMaxLen:
return f"CAST({self.db.quoteId(field.name)} AS VARCHAR2(135))"
elif field.modifier:
nbChars = 2 + int(field.charMaxLen) + int(field.modifier)
return "CAST({} AS VARCHAR2({}))".format(
self.db.quoteId(field.name), str(nbChars)
)
return "CAST({} As VARCHAR2({}))".format(
self.db.quoteId(field.name), field.charMaxLen
)
def _deleteCursor(self):
self.db._close_cursor(self.cursor)
self.cursor = None
def __del__(self):
self.table.aboutToChange.disconnect(self._deleteCursor)
self._deleteCursor()
def getData(self, row, col):
if row < self.fetchedFrom or row >= self.fetchedFrom + self.fetchedCount:
margin = self.fetchedCount / 2
if row + margin >= self.rowCount():
start = int(self.rowCount() - margin)
else:
start = int(row - margin)
if start < 0:
start = 0
self.fetchMoreData(start)
# For some improbable cases
if row - self.fetchedFrom >= len(self.resdata):
return None
return self.resdata[row - self.fetchedFrom][col]
def fetchMoreData(self, row_start):
if not self.cursor:
self._createCursor()
self.cursor.scroll(row_start - 1)
self.resdata = self.cursor.fetchmany(self.fetchedCount)
self.fetchedFrom = row_start
class ORSqlResultModelTask(SqlResultModelTask):
def __init__(self, db, sql, parent):
super().__init__(db, sql, parent)
def run(self):
try:
self.model = ORSqlResultModel(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 ORSqlResultModelAsync(SqlResultModelAsync):
def __init__(self, db, sql, parent):
super().__init__()
self.task = ORSqlResultModelTask(db, sql, parent)
self.task.taskCompleted.connect(self.modelDone)
self.task.taskTerminated.connect(self.modelDone)
class ORSqlResultModel(SqlResultModel):
def __init__(self, db, sql, parent=None):
self.db = db.connector
t = QElapsedTimer()
t.start()
c = self.db._execute(None, str(sql))
self._affectedRows = 0
data = []
header = self.db._get_cursor_columns(c)
if not header:
header = []
try:
if len(header) > 0:
data = self.db._fetchall(c)
self._affectedRows = len(data)
except DbError:
# nothing to fetch!
data = []
header = []
self._secs = t.elapsed() / 1000.0
del t
BaseTableModel.__init__(self, header, data, parent)
# commit before closing the cursor to make sure that the
# changes are stored
self.db._commit()
c.close()
del c
|
