pgRoutingLayer/dbConnection.py at develop · pgRouting/pgRoutingLayer · GitHub

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# -*- coding: utf-8 -*-

# /*PGR-GNU*****************************************************************

# File: dbConnection.py

# Mail: project@pgrouting.org

# Developer's GitHub nickname:

# - AasheeshT

# - cayetanobv

# - sanak

# - cvvergara

# - anitagraser

# ------

# 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.

# 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, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# ********************************************************************PGR-GNU*/

from __future__ import absolute_import

from qgis.core import QgsDataSourceUri

from qgis.PyQt.QtCore import QSettings

from qgis.PyQt.QtWidgets import QAction

class ConnectionManager(object):

SUPPORTED_CONNECTORS = ['postgis']

MISSED_CONNECTORS = []

@classmethod

def initConnectionSupport(self):

conntypes = ConnectionManager.SUPPORTED_CONNECTORS

for c in conntypes:

try:

self.getConnection(c)

except ImportError as e:

module = e.args[0][len("No module named "):]

ConnectionManager.SUPPORTED_CONNECTORS.remove(c)

ConnectionManager.MISSED_CONNECTORS.append((c, module))

@classmethod

def getConnection(self, conntype, uri=None):

if not self.isSupported(conntype):

raise NotSupportedConnTypeException(conntype)

# import the connector

exec("from pgRoutingLayer.connectors import %s as connector" % conntype, globals(), globals())

return connector.Connection(uri) if uri else connector.Connection

@classmethod

def isSupported(self, conntype):

return conntype in ConnectionManager.SUPPORTED_CONNECTORS

@classmethod

def getAvailableConnections(self, conntypes=None):

if conntypes is None:

conntypes = ConnectionManager.SUPPORTED_CONNECTORS

if not hasattr(conntypes, '__iter__'):

conntypes = [conntypes]

connections = []

for c in conntypes:

connection = self.getConnection(c)

connections.extend(connection.getAvailableConnections())

return connections

class NotSupportedConnTypeException(Exception):

def __init__(self, conntype):

self.msg = u"%s is not supported yet" % conntype

def __str__(self):

return self.msg.encode('utf-8')

class DbError(Exception):

def __init__(self, errormsg, query=None):

self.msg = str(errormsg)

self.query = str(query) if query else None

def __str__(self):

msg = self.msg.encode('utf-8')

if self.query:

msg += "\nQuery:\n" + self.query.encode('utf-8')

return msg

class Connection(object):

def __init__(self, uri):

self.uri = uri

@classmethod

def getTypeName(self):

pass

@classmethod

def getTypeNameString(self):

pass

@classmethod

def getProviderName(self):

pass

@classmethod

def getSettingsKey(self):

pass

@classmethod

def icon(self):

pass

@classmethod

def getAvailableConnections(self):

connections = []

settings = QSettings()

settings.beginGroup("/%s/connections" % self.getSettingsKey())

keys = settings.childGroups()

for name in keys:

connections.append(Connection.ConnectionAction(name, self.getTypeName()))

settings.endGroup()

return connections

def getURI(self):

# returns a new QgsDataSourceUri instance

return QgsDataSourceUri(self.uri.connectionInfo())

def getAction(self, parent=None):

return Connection.ConnectionAction(self.uri.database(), self.getTypeName(), parent)

class ConnectionAction(QAction):

def __init__(self, text, conntype, parent=None):

self.type = conntype

icon = ConnectionManager.getConnection(self.type).icon()

QAction.__init__(self, icon, text, parent)

def connect(self):

selected = self.text()

conn = ConnectionManager.getConnection(self.type).connect(selected, self.parent())

# set as default in QSettings

settings = QSettings()

settings.setValue("/%s/connections/selected" % conn.getSettingsKey(), selected)

return conn

class TableAttribute(object):

pass

class TableConstraint(object):

""" class that represents a constraint of a table (relation) """

TypeCheck, TypeForeignKey, TypePrimaryKey, TypeUnique = list(range(4))

types = {"c": TypeCheck, "f": TypeForeignKey, "p": TypePrimaryKey, "u": TypeUnique}

on_action = {"a": "NO ACTION", "r": "RESTRICT", "c": "CASCADE", "n": "SET NULL", "d": "SET DEFAULT"}

match_types = {"u": "UNSPECIFIED", "f": "FULL", "p": "PARTIAL"}

class TableIndex(object):

pass

class TableTrigger(object):

# Bits within tgtype (pg_trigger.h)

TypeRow = (1 << 0) # row or statement

TypeBefore = (1 << 1) # before or after

# events: one or more

TypeInsert = (1 << 2)

TypeDelete = (1 << 3)

TypeUpdate = (1 << 4)

TypeTruncate = (1 << 5)

class TableRule(object):

pass

class TableField(object):

def is_null_txt(self):

if self.is_null:

return "NULL"

else:

return "NOT NULL"

def field_def(self, db):

""" return field definition as used for CREATE TABLE or ALTER TABLE command """

data_type = self.data_type if (not self.modifier or self.modifier < 0) else "%s(%d)" % (self.data_type, self.modifier)

txt = "%s %s %s" % (db._quote(self.name), data_type, self.is_null_txt())

if self.default and len(self.default) > 0:

txt += " DEFAULT %s" % self.default

return txt

pgRoutingLayer/dbConnection.py at develop · pgRouting/pgRoutingLayer · GitHub

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pgRoutingLayer/dbConnection.py at develop · pgRouting/pgRoutingLayer · GitHub

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