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# -*- coding: utf-8 -*-
"""
/***************************************************************************
Name : DB Manager
Description : Database manager plugin for QGIS
Date : May 23, 2011
copyright : (C) 2011 by Giuseppe Sucameli
email : brush.tyler@gmail.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. *
* *
***************************************************************************/
"""
from qgis.core import QgsDataSourceURI
from .plugin import DbError, ConnectionError
class DBConnector:
def __init__(self, uri):
self.connection = None
self._uri = uri
def __del__(self):
pass # print "DBConnector.__del__", self._uri.connectionInfo()
if self.connection is not None:
self.connection.close()
self.connection = None
def uri(self):
return QgsDataSourceURI(self._uri.uri(False))
def publicUri(self):
publicUri = QgsDataSourceURI.removePassword(self._uri.uri(False))
return QgsDataSourceURI(publicUri)
def hasSpatialSupport(self):
return False
def canAddGeometryColumn(self, table):
return self.hasSpatialSupport()
def canAddSpatialIndex(self, table):
return self.hasSpatialSupport()
def hasRasterSupport(self):
return False
def hasCustomQuerySupport(self):
return False
def hasTableColumnEditingSupport(self):
return False
def hasCreateSpatialViewSupport(self):
return False
def execution_error_types(self):
raise Exception("DBConnector.execution_error_types() is an abstract method")
def connection_error_types(self):
raise Exception("DBConnector.connection_error_types() is an abstract method")
def error_types(self):
return self.connection_error_types() + self.execution_error_types()
def _execute(self, cursor, sql):
if cursor is None:
cursor = self._get_cursor()
try:
cursor.execute(sql)
except self.connection_error_types() as e:
raise ConnectionError(e)
except self.execution_error_types() as e:
# do the rollback to avoid a "current transaction aborted, commands ignored" errors
self._rollback()
raise DbError(e, sql)
return cursor
def _execute_and_commit(self, sql):
""" tries to execute and commit some action, on error it rolls back the change """
self._execute(None, sql)
self._commit()
def _get_cursor(self, name=None):
try:
if name is not None:
name = str(name).encode('ascii', 'replace').replace('?', "_")
self._last_cursor_named_id = 0 if not hasattr(self,
'_last_cursor_named_id') else self._last_cursor_named_id + 1
return self.connection.cursor("%s_%d" % (name, self._last_cursor_named_id))
return self.connection.cursor()
except self.connection_error_types() as e:
raise ConnectionError(e)
except self.execution_error_types() as e:
# do the rollback to avoid a "current transaction aborted, commands ignored" errors
self._rollback()
raise DbError(e)
def _close_cursor(self, c):
try:
if c and not c.closed:
c.close()
except self.error_types():
pass
return
def _fetchall(self, c):
try:
return c.fetchall()
except self.connection_error_types() as e:
raise ConnectionError(e)
except self.execution_error_types() as e:
# do the rollback to avoid a "current transaction aborted, commands ignored" errors
self._rollback()
raise DbError(e)
def _fetchone(self, c):
try:
return c.fetchone()
except self.connection_error_types() as e:
raise ConnectionError(e)
except self.execution_error_types() as e:
# do the rollback to avoid a "current transaction aborted, commands ignored" errors
self._rollback()
raise DbError(e)
def _commit(self):
try:
self.connection.commit()
except self.connection_error_types() as e:
raise ConnectionError(e)
except self.execution_error_types() as e:
# do the rollback to avoid a "current transaction aborted, commands ignored" errors
self._rollback()
raise DbError(e)
def _rollback(self):
try:
self.connection.rollback()
except self.connection_error_types() as e:
raise ConnectionError(e)
except self.execution_error_types() as e:
# do the rollback to avoid a "current transaction aborted, commands ignored" errors
self._rollback()
raise DbError(e)
def _get_cursor_columns(self, c):
try:
if c.description:
return [x[0] for x in c.description]
except self.connection_error_types() + self.execution_error_types():
return []
@classmethod
def quoteId(self, identifier):
if hasattr(identifier, '__iter__') and not isinstance(identifier, str):
ids = list()
for i in identifier:
if i is None or i == "":
continue
ids.append(self.quoteId(i))
return u'.'.join(ids)
identifier = str(
identifier) if identifier is not None else str() # make sure it's python unicode string
return u'"%s"' % identifier.replace('"', '""')
@classmethod
def quoteString(self, txt):
""" make the string safe - replace ' with '' """
if hasattr(txt, '__iter__') and not isinstance(txt, str):
txts = list()
for i in txt:
if i is None:
continue
txts.append(self.quoteString(i))
return u'.'.join(txts)
txt = str(txt) if txt is not None else str() # make sure it's python unicode string
return u"'%s'" % txt.replace("'", "''")
@classmethod
def getSchemaTableName(self, table):
if not hasattr(table, '__iter__') and not isinstance(table, str):
return (None, table)
if isinstance(table, str):
table = table.split('.')
if len(table) < 2:
return (None, table[0])
else:
return (table[0], table[1])
@classmethod
def getSqlDictionary(self):
""" return a generic SQL dictionary """
try:
from ..sql_dictionary import getSqlDictionary
return getSqlDictionary()
except ImportError:
return []
def getQueryBuilderDictionary(self):
return {}
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