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# -*- coding: utf-8 -*-
"""
/***************************************************************************
Name : DB Manager plugin for virtual layers
Date : December 2015
copyright : (C) 2015 by Hugo Mercier
email : hugo dot mercier at oslandia dot 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
# this will disable the dbplugin if the connector raise an ImportError
from .connector import VLayerConnector
from qgis.PyQt.QtCore import QUrl
from qgis.PyQt.QtGui import QIcon
from qgis.core import QgsVectorLayer, QgsMapLayerRegistry
from ..plugin import DBPlugin, Database, Table, VectorTable, TableField
from . import resources_rc # NOQA
def classFactory():
return VLayerDBPlugin
class VLayerDBPlugin(DBPlugin):
@classmethod
def icon(self):
return QIcon(":/db_manager/vlayers/icon")
@classmethod
def typeName(self):
return 'vlayers'
@classmethod
def typeNameString(self):
return 'Virtual Layers'
@classmethod
def providerName(self):
return 'virtual'
@classmethod
def connectionSettingsKey(self):
return 'vlayers'
@classmethod
def connections(self):
return [VLayerDBPlugin('QGIS layers')]
def databasesFactory(self, connection, uri):
return FakeDatabase(connection, uri)
def database(self):
return self.db
# def info( self ):
def connect(self, parent=None):
self.connectToUri("qgis")
return True
class FakeDatabase(Database):
def __init__(self, connection, uri):
Database.__init__(self, connection, uri)
def connectorsFactory(self, uri):
return VLayerConnector(uri)
def dataTablesFactory(self, row, db, schema=None):
return LTable(row, db, schema)
def vectorTablesFactory(self, row, db, schema=None):
return LVectorTable(row, db, schema)
def rasterTablesFactory(self, row, db, schema=None):
return None
def info(self):
from .info_model import LDatabaseInfo
return LDatabaseInfo(self)
def sqlResultModel(self, sql, parent):
from .data_model import LSqlResultModel
return LSqlResultModel(self, sql, parent)
def toSqlLayer(self, sql, geomCol, uniqueCol, layerName="QueryLayer", layerType=None, avoidSelectById=False, _filter=""):
q = QUrl.toPercentEncoding(sql)
s = "?query=%s" % q
if uniqueCol is not None:
s += "&uid=" + uniqueCol
if geomCol is not None:
s += "&geometry=" + geomCol
vl = QgsVectorLayer(s, layerName, "virtual")
if _filter:
vl.setSubsetString(_filter)
return vl
def registerDatabaseActions(self, mainWindow):
return
def runAction(self, action):
return
def uniqueIdFunction(self):
return None
def explicitSpatialIndex(self):
return True
def spatialIndexClause(self, src_table, src_column, dest_table, dest_column):
return '"%s"._search_frame_ = "%s"."%s"' % (src_table, dest_table, dest_column)
class LTable(Table):
def __init__(self, row, db, schema=None):
Table.__init__(self, db, None)
self.name, self.isView, self.isSysTable = row
def tableFieldsFactory(self, row, table):
return LTableField(row, table)
def tableDataModel(self, parent):
from .data_model import LTableDataModel
return LTableDataModel(self, parent)
def canBeAddedToCanvas(self):
return False
class LVectorTable(LTable, VectorTable):
def __init__(self, row, db, schema=None):
LTable.__init__(self, row[:-5], db, schema)
VectorTable.__init__(self, db, schema)
# SpatiaLite does case-insensitive checks for table names, but the
# SL provider didn't do the same in QGis < 1.9, so self.geomTableName
# stores the table name like stored in the geometry_columns table
self.geomTableName, self.geomColumn, self.geomType, self.geomDim, self.srid = row[
-5:]
def uri(self):
uri = self.database().uri()
uri.setDataSource('', self.geomTableName, self.geomColumn)
return uri
def hasSpatialIndex(self, geom_column=None):
return True
def createSpatialIndex(self, geom_column=None):
return
def deleteSpatialIndex(self, geom_column=None):
return
def refreshTableEstimatedExtent(self):
self.extent = self.database().connector.getTableExtent(
("id", self.geomTableName), None)
def runAction(self, action):
return
def toMapLayer(self):
return QgsMapLayerRegistry.instance().mapLayer(self.geomTableName)
class LTableField(TableField):
def __init__(self, row, table):
TableField.__init__(self, table)
self.num, self.name, self.dataType, self.notNull, self.default, self.primaryKey = row
self.hasDefault = self.default
|
