def __init__(self, uri):

"""Creates a new DB connector

"""

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 cancel(self):

pass

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:

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 getComment(self, tablename, field):

"""Returns the comment for a field"""

return ''

def commentTable(self, schema, tablename, comment=None):

"""Comment the table"""

pass

def getQueryBuilderDictionary(self):