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# -*- coding: utf-8 -*-
"""
/***************************************************************************
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 QTime
from ..data_model import TableDataModel, SqlResultModel, BaseTableModel
from ..plugin import DbError
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 = u", ".join(self.fields)
table_txt = self.db.quoteId(
(self.table.schemaName(), self.table.name))
self.cursor = self.db._get_cursor()
sql = u"SELECT {0} FROM {1}".format(fields_txt, table_txt)
self.db._execute(self.cursor, sql)
def _sanitizeTableField(self, field):
# get fields, ignore geometry columns
if field.dataType.upper() == u"SDO_GEOMETRY":
return (u"CASE WHEN {0} IS NULL THEN NULL ELSE 'GEOMETRY'"
u"END AS {0}".format(
self.db.quoteId(field.name)))
if field.dataType.upper() == u"DATE":
return u"CAST({} AS VARCHAR2(8))".format(
self.db.quoteId(field.name))
if u"TIMESTAMP" in field.dataType.upper():
return u"TO_CHAR({}, 'YYYY-MM-DD HH:MI:SS.FF')".format(
self.db.quoteId(field.name))
if field.dataType.upper() == u"NUMBER":
if not field.charMaxLen:
return u"CAST({} AS VARCHAR2(135))".format(
self.db.quoteId(field.name))
elif field.modifier:
nbChars = 2 + int(field.charMaxLen) + \
int(field.modifier)
return u"CAST({} AS VARCHAR2({}))".format(
self.db.quoteId(field.name),
unicode(nbChars))
return u"CAST({0} As VARCHAR2({1}))".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 = self.rowCount() - margin
else:
start = 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 ORSqlResultModel(SqlResultModel):
def __init__(self, db, sql, parent=None):
self.db = db.connector
t = QTime()
t.start()
c = self.db._execute(None, unicode(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
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