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|
# firebird/kinterbasdb.py
# Copyright (C) 2005-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""
.. dialect:: firebird+kinterbasdb
:name: kinterbasdb
:dbapi: kinterbasdb
:connectstring: firebird+kinterbasdb://user:password@host:port/path/to/db[?key=value&key=value...]
:url: http://firebirdsql.org/index.php?op=devel&sub=python
Arguments
----------
The Kinterbasdb backend accepts the ``enable_rowcount`` and ``retaining``
arguments accepted by the :mod:`sqlalchemy.dialects.firebird.fdb` dialect. In addition, it
also accepts the following:
* ``type_conv`` - select the kind of mapping done on the types: by default
SQLAlchemy uses 200 with Unicode, datetime and decimal support. See
the linked documents below for further information.
* ``concurrency_level`` - set the backend policy with regards to threading
issues: by default SQLAlchemy uses policy 1. See the linked documents
below for futher information.
.. seealso::
http://sourceforge.net/projects/kinterbasdb
http://kinterbasdb.sourceforge.net/dist_docs/usage.html#adv_param_conv_dynamic_type_translation
http://kinterbasdb.sourceforge.net/dist_docs/usage.html#special_issue_concurrency
"""
from .base import FBDialect, FBExecutionContext
from ... import util, types as sqltypes
from re import match
import decimal
class _FBNumeric_kinterbasdb(sqltypes.Numeric):
def bind_processor(self, dialect):
def process(value):
if isinstance(value, decimal.Decimal):
return str(value)
else:
return value
return process
class FBExecutionContext_kinterbasdb(FBExecutionContext):
@property
def rowcount(self):
if self.execution_options.get('enable_rowcount',
self.dialect.enable_rowcount):
return self.cursor.rowcount
else:
return -1
class FBDialect_kinterbasdb(FBDialect):
driver = 'kinterbasdb'
supports_sane_rowcount = False
supports_sane_multi_rowcount = False
execution_ctx_cls = FBExecutionContext_kinterbasdb
supports_native_decimal = True
colspecs = util.update_copy(
FBDialect.colspecs,
{
sqltypes.Numeric: _FBNumeric_kinterbasdb,
}
)
def __init__(self, type_conv=200, concurrency_level=1,
enable_rowcount=True,
retaining=False, **kwargs):
super(FBDialect_kinterbasdb, self).__init__(**kwargs)
self.enable_rowcount = enable_rowcount
self.type_conv = type_conv
self.concurrency_level = concurrency_level
self.retaining = retaining
if enable_rowcount:
self.supports_sane_rowcount = True
@classmethod
def dbapi(cls):
return __import__('kinterbasdb')
def do_execute(self, cursor, statement, parameters, context=None):
# kinterbase does not accept a None, but wants an empty list
# when there are no arguments.
cursor.execute(statement, parameters or [])
def do_rollback(self, dbapi_connection):
dbapi_connection.rollback(self.retaining)
def do_commit(self, dbapi_connection):
dbapi_connection.commit(self.retaining)
def create_connect_args(self, url):
opts = url.translate_connect_args(username='user')
if opts.get('port'):
opts['host'] = "%s/%s" % (opts['host'], opts['port'])
del opts['port']
opts.update(url.query)
util.coerce_kw_type(opts, 'type_conv', int)
type_conv = opts.pop('type_conv', self.type_conv)
concurrency_level = opts.pop('concurrency_level',
self.concurrency_level)
if self.dbapi is not None:
initialized = getattr(self.dbapi, 'initialized', None)
if initialized is None:
# CVS rev 1.96 changed the name of the attribute:
# http://kinterbasdb.cvs.sourceforge.net/viewvc/kinterbasdb/
# Kinterbasdb-3.0/__init__.py?r1=1.95&r2=1.96
initialized = getattr(self.dbapi, '_initialized', False)
if not initialized:
self.dbapi.init(type_conv=type_conv,
concurrency_level=concurrency_level)
return ([], opts)
def _get_server_version_info(self, connection):
"""Get the version of the Firebird server used by a connection.
Returns a tuple of (`major`, `minor`, `build`), three integers
representing the version of the attached server.
"""
# This is the simpler approach (the other uses the services api),
# that for backward compatibility reasons returns a string like
# LI-V6.3.3.12981 Firebird 2.0
# where the first version is a fake one resembling the old
# Interbase signature.
fbconn = connection.connection
version = fbconn.server_version
return self._parse_version_info(version)
def _parse_version_info(self, version):
m = match('\w+-V(\d+)\.(\d+)\.(\d+)\.(\d+)( \w+ (\d+)\.(\d+))?', version)
if not m:
raise AssertionError(
"Could not determine version from string '%s'" % version)
if m.group(5) != None:
return tuple([int(x) for x in m.group(6, 7, 4)] + ['firebird'])
else:
return tuple([int(x) for x in m.group(1, 2, 3)] + ['interbase'])
def is_disconnect(self, e, connection, cursor):
if isinstance(e, (self.dbapi.OperationalError,
self.dbapi.ProgrammingError)):
msg = str(e)
return ('Unable to complete network request to host' in msg or
'Invalid connection state' in msg or
'Invalid cursor state' in msg or
'connection shutdown' in msg)
else:
return False
dialect = FBDialect_kinterbasdb
|
