Source code for lib_openmolar.admin.connect
#! /usr/bin/env python
# -*- coding: utf-8 -*-
###############################################################################
## ##
## Copyright 2010, Neil Wallace <rowinggolfer@googlemail.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 3 of the License, or ##
## (at your option) any later version. ##
## ##
## This program is distributed in the hope that it will be useful, ##
## but WITHOUT ANY WARRANTY; without even the implied warranty of ##
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ##
## GNU General Public License for more details. ##
## ##
## You should have received a copy of the GNU General Public License ##
## along with this program. If not, see <http://www.gnu.org/licenses/>. ##
## ##
###############################################################################
'''
AdminPostgresDatabase -
a custom class inheriting from :doc:`PostgresDatabase`
'''
from __future__ import division
from PyQt4 import QtSql
from PyQt4 import QtGui, QtCore
from lib_openmolar.common.datatypes import OMTypes, ConnectionData
from lib_openmolar.common.qt4.postgres.postgres_database import \
PostgresDatabase
from lib_openmolar.admin.db_orm import *
[docs]class AdminConnection(PostgresDatabase):
'''
inherits from lib_openmolar.common.connect.PostgresDatabase,
which in turn inherits from PyQt4.QSql.QSqlDatabase
'''
@property
[docs] def admin_modules(self):
'''
provide access to the list of modules in use
'''
return ADMIN_MODULES
[docs] def get_available_tables(self):
'''
returns a list of tables in the currently selected database
'''
return self.tables()
[docs] def populateDemo(self, ommitted_modules=[]):
'''
checks connection is to openmolar_demo, and if so,
adds demo data to the tables.
'''
if not self.isOpen():
return (False, _("no connection"))
LOGGER.info("POPULATING DATABASE WITH DEMO DATA")
## iterate over the ORM modules
## order is important (foreign keys etc)
for module in ADMIN_MODULES:
if module in ommitted_modules:
continue
try:
builder = module.DemoGenerator(self)
logged = False
total_number_of_queries = builder.length
number_of_queries_executed = 0
for query, values in builder.demo_queries():
if not logged:
LOGGER.info(u"%s..."% query[:77])
logged = True
q_query = QtSql.QSqlQuery(self)
q_query.prepare(query)
for value in values:
q_query.addBindValue(value)
q_query.exec_()
if q_query.lastError().isValid():
error = q_query.lastError().text()
self.emit_(QtCore.SIGNAL("Query Error"), error)
LOGGER.error(error)
break
number_of_queries_executed += 1
progress = int(number_of_queries_executed /
total_number_of_queries * 100)
self.emit_(QtCore.SIGNAL("demo progress"),
module, progress)
else: #some modules have no queries
self.emit_(QtCore.SIGNAL("demo progress"), module, 100)
except Exception as e:
self.emit_(QtCore.SIGNAL("Query Error"),
'''Error installing demo data from module %s<hr />%s'''% (
module.__name__, e))
LOGGER.error('ERROR INSTALLING DATA from module %s'%
module.__name__)
LOGGER.exception('CRITICAL ERROR')
self.emit_(QtCore.SIGNAL("demo install complete"))
LOGGER.info("DEMO INSTALL COMPLETE")
return True
[docs] def emit_(self, *args):
'''
emit signals but be wary of case when there is no gui
(ie. when install demo is called from CLI)
'''
if QtGui.QApplication.instance() is None:
return
QtGui.QApplication.instance().emit(*args)
[docs]class DemoAdminConnection(AdminConnection):
'''
A connection to the demo database (on localhost)
used for testing purposes.
'''
[docs] def __init__(self):
conn_data = ConnectionData()
conn_data.demo_connection()
AdminConnection.__init__(self, conn_data)
if __name__ == "__main__":
import gettext
gettext.install("openmolar")
app = QtGui.QApplication([])
sc = DemoAdminConnection()
sc.connect()
