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|
# postgresql/pygresql.py
# Copyright (C) 2005-2016 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:: postgresql+pygresql
:name: pygresql
:dbapi: pgdb
:connectstring: postgresql+pygresql://user:password@host:port/dbname\
[?key=value&key=value...]
:url: http://www.pygresql.org/
"""
import decimal
import re
from ... import exc, processors, util
from ...types import Numeric, JSON as Json
from .base import PGDialect, _DECIMAL_TYPES, _FLOAT_TYPES, _INT_TYPES, UUID
from .hstore import HSTORE
from .json import JSON, JSONB
class _PGNumeric(Numeric):
def bind_processor(self, dialect):
return None
def result_processor(self, dialect, coltype):
oid = coltype.oid
if self.asdecimal:
if oid in _FLOAT_TYPES:
return processors.to_decimal_processor_factory(
decimal.Decimal,
self._effective_decimal_return_scale)
elif oid in _DECIMAL_TYPES or coltype in _INT_TYPES:
# PyGreSQL returns Decimal natively for 1700 (numeric)
return None
else:
raise exc.InvalidRequestError(
"Unknown PG numeric type: %d" % coltype)
else:
if oid in _FLOAT_TYPES:
# PyGreSQL returns float natively for 701 (float8)
return None
elif oid in _DECIMAL_TYPES or coltype in _INT_TYPES:
return processors.to_float
else:
raise exc.InvalidRequestError(
"Unknown PG numeric type: %d" % coltype)
class _PGHStore(HSTORE):
def bind_processor(self, dialect):
if not dialect._use_native_hstore:
return super(_PGHStore, self).bind_processor(dialect)
def result_processor(self, dialect, coltype):
if not dialect._use_native_hstore:
return super(_PGHStore, self).result_processor(dialect, coltype)
class _PGJSON(JSON):
def bind_processor(self, dialect):
if not dialect._use_native_json:
return super(_PGJSON, self).bind_processor(dialect)
def result_processor(self, dialect, coltype):
if not dialect._use_native_json:
return super(_PGJSON, self).result_processor(dialect, coltype)
class _PGJSONB(JSONB):
def bind_processor(self, dialect):
if not dialect._use_native_json:
return super(_PGJSONB, self).bind_processor(dialect)
def result_processor(self, dialect, coltype):
if not dialect._use_native_json:
return super(_PGJSONB, self).result_processor(dialect, coltype)
class _PGUUID(UUID):
def bind_processor(self, dialect):
if not dialect._use_native_uuid:
return super(_PGUUID, self).bind_processor(dialect)
def result_processor(self, dialect, coltype):
if not dialect._use_native_uuid:
return super(_PGUUID, self).result_processor(dialect, coltype)
class PGDialect_pygresql(PGDialect):
driver = 'pygresql'
_has_native_hstore = False
@classmethod
def dbapi(cls):
import pgdb
return pgdb
colspecs = util.update_copy(
PGDialect.colspecs,
{
Numeric: _PGNumeric,
HSTORE: _PGHStore,
Json: _PGJSON,
JSON: _PGJSON,
JSONB: _PGJSONB,
UUID: _PGUUID,
}
)
def __init__(self, use_native_hstore=False,
use_native_json=False, use_native_uuid=True, **kwargs):
super(PGDialect_pygresql, self).__init__(**kwargs)
if self.dbapi:
try:
version = self.dbapi.version
m = re.match(r'(\d+)\.(\d+)', version)
version = (int(m.group(1)), int(m.group(2)))
except (AttributeError, ValueError):
version = (0, 0)
self.dbapi_version = version
self.use_native_hstore = use_native_hstore and version >= (5, 0)
self.use_native_json = use_native_json and version >= (5, 0)
self.use_native_uuid = use_native_uuid and version >= (5, 0)
def create_connect_args(self, url):
opts = url.translate_connect_args(username='user')
if 'port' in opts:
opts['host'] = '%s:%s' % (
opts['host'].rsplit(':', 1)[0], opts.pop('port'))
opts.update(url.query)
return [], opts
dialect = PGDialect_pygresql
|
