244 lines
7.4 KiB
Python
244 lines
7.4 KiB
Python
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# postgresql/pygresql.py
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# Copyright (C) 2005-2017 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""
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.. dialect:: postgresql+pygresql
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:name: pygresql
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:dbapi: pgdb
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:connectstring: postgresql+pygresql://user:password@host:port/dbname\
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[?key=value&key=value...]
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:url: http://www.pygresql.org/
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"""
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import decimal
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import re
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from ... import exc, processors, util
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from ...types import Numeric, JSON as Json
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from ...sql.elements import Null
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from .base import PGDialect, PGCompiler, PGIdentifierPreparer, \
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_DECIMAL_TYPES, _FLOAT_TYPES, _INT_TYPES, UUID
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from .hstore import HSTORE
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from .json import JSON, JSONB
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class _PGNumeric(Numeric):
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def bind_processor(self, dialect):
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return None
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def result_processor(self, dialect, coltype):
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if not isinstance(coltype, int):
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coltype = coltype.oid
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if self.asdecimal:
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if coltype in _FLOAT_TYPES:
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return processors.to_decimal_processor_factory(
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decimal.Decimal,
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self._effective_decimal_return_scale)
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elif coltype in _DECIMAL_TYPES or coltype in _INT_TYPES:
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# PyGreSQL returns Decimal natively for 1700 (numeric)
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return None
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else:
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raise exc.InvalidRequestError(
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"Unknown PG numeric type: %d" % coltype)
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else:
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if coltype in _FLOAT_TYPES:
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# PyGreSQL returns float natively for 701 (float8)
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return None
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elif coltype in _DECIMAL_TYPES or coltype in _INT_TYPES:
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return processors.to_float
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else:
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raise exc.InvalidRequestError(
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"Unknown PG numeric type: %d" % coltype)
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class _PGHStore(HSTORE):
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def bind_processor(self, dialect):
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if not dialect.has_native_hstore:
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return super(_PGHStore, self).bind_processor(dialect)
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hstore = dialect.dbapi.Hstore
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def process(value):
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if isinstance(value, dict):
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return hstore(value)
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return value
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return process
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def result_processor(self, dialect, coltype):
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if not dialect.has_native_hstore:
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return super(_PGHStore, self).result_processor(dialect, coltype)
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class _PGJSON(JSON):
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def bind_processor(self, dialect):
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if not dialect.has_native_json:
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return super(_PGJSON, self).bind_processor(dialect)
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json = dialect.dbapi.Json
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def process(value):
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if value is self.NULL:
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value = None
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elif isinstance(value, Null) or (
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value is None and self.none_as_null):
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return None
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if value is None or isinstance(value, (dict, list)):
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return json(value)
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return value
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return process
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def result_processor(self, dialect, coltype):
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if not dialect.has_native_json:
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return super(_PGJSON, self).result_processor(dialect, coltype)
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class _PGJSONB(JSONB):
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def bind_processor(self, dialect):
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if not dialect.has_native_json:
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return super(_PGJSONB, self).bind_processor(dialect)
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json = dialect.dbapi.Json
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def process(value):
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if value is self.NULL:
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value = None
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elif isinstance(value, Null) or (
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value is None and self.none_as_null):
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return None
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if value is None or isinstance(value, (dict, list)):
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return json(value)
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return value
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return process
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def result_processor(self, dialect, coltype):
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if not dialect.has_native_json:
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return super(_PGJSONB, self).result_processor(dialect, coltype)
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class _PGUUID(UUID):
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def bind_processor(self, dialect):
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if not dialect.has_native_uuid:
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return super(_PGUUID, self).bind_processor(dialect)
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uuid = dialect.dbapi.Uuid
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def process(value):
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if value is None:
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return None
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if isinstance(value, (str, bytes)):
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if len(value) == 16:
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return uuid(bytes=value)
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return uuid(value)
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if isinstance(value, int):
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return uuid(int=value)
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return value
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return process
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def result_processor(self, dialect, coltype):
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if not dialect.has_native_uuid:
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return super(_PGUUID, self).result_processor(dialect, coltype)
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if not self.as_uuid:
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def process(value):
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if value is not None:
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return str(value)
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return process
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class _PGCompiler(PGCompiler):
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def visit_mod_binary(self, binary, operator, **kw):
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return self.process(binary.left, **kw) + " %% " + \
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self.process(binary.right, **kw)
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def post_process_text(self, text):
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return text.replace('%', '%%')
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class _PGIdentifierPreparer(PGIdentifierPreparer):
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def _escape_identifier(self, value):
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value = value.replace(self.escape_quote, self.escape_to_quote)
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return value.replace('%', '%%')
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class PGDialect_pygresql(PGDialect):
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driver = 'pygresql'
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statement_compiler = _PGCompiler
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preparer = _PGIdentifierPreparer
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@classmethod
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def dbapi(cls):
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import pgdb
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return pgdb
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colspecs = util.update_copy(
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PGDialect.colspecs,
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{
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Numeric: _PGNumeric,
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HSTORE: _PGHStore,
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Json: _PGJSON,
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JSON: _PGJSON,
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JSONB: _PGJSONB,
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UUID: _PGUUID,
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}
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)
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def __init__(self, **kwargs):
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super(PGDialect_pygresql, self).__init__(**kwargs)
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try:
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version = self.dbapi.version
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m = re.match(r'(\d+)\.(\d+)', version)
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version = (int(m.group(1)), int(m.group(2)))
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except (AttributeError, ValueError, TypeError):
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version = (0, 0)
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self.dbapi_version = version
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if version < (5, 0):
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has_native_hstore = has_native_json = has_native_uuid = False
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if version != (0, 0):
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util.warn("PyGreSQL is only fully supported by SQLAlchemy"
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" since version 5.0.")
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else:
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self.supports_unicode_statements = True
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self.supports_unicode_binds = True
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has_native_hstore = has_native_json = has_native_uuid = True
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self.has_native_hstore = has_native_hstore
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self.has_native_json = has_native_json
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self.has_native_uuid = has_native_uuid
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def create_connect_args(self, url):
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opts = url.translate_connect_args(username='user')
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if 'port' in opts:
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opts['host'] = '%s:%s' % (
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opts.get('host', '').rsplit(':', 1)[0], opts.pop('port'))
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opts.update(url.query)
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return [], opts
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def is_disconnect(self, e, connection, cursor):
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if isinstance(e, self.dbapi.Error):
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if not connection:
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return False
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try:
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connection = connection.connection
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except AttributeError:
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pass
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else:
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if not connection:
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return False
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try:
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return connection.closed
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except AttributeError: # PyGreSQL < 5.0
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return connection._cnx is None
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return False
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dialect = PGDialect_pygresql
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