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# postgresql/pypostgresql.py # Copyright (C) 2005-2021 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+pypostgresql :name: py-postgresql :dbapi: pypostgresql :connectstring: postgresql+pypostgresql://user:password@host:port/dbname[?key=value&key=value...] :url: http://python.projects.pgfoundry.org/ .. note:: The pypostgresql dialect is not tested as part of SQLAlchemy's continuous integration and may have unresolved issues. The recommended PostgreSQL driver is psycopg2. """ # noqa from .base import PGDialect from .base import PGExecutionContext from ... import processors from ... import types as sqltypes from ... import util class PGNumeric(sqltypes.Numeric): def bind_processor(self, dialect): return processors.to_str def result_processor(self, dialect, coltype): if self.asdecimal: return None else: return processors.to_float class PGExecutionContext_pypostgresql(PGExecutionContext): pass class PGDialect_pypostgresql(PGDialect): driver = "pypostgresql" supports_unicode_statements = True supports_unicode_binds = True description_encoding = None default_paramstyle = "pyformat" # requires trunk version to support sane rowcounts # TODO: use dbapi version information to set this flag appropriately supports_sane_rowcount = True supports_sane_multi_rowcount = False execution_ctx_cls = PGExecutionContext_pypostgresql colspecs = util.update_copy( PGDialect.colspecs, { sqltypes.Numeric: PGNumeric, # prevents PGNumeric from being used sqltypes.Float: sqltypes.Float, }, ) @classmethod def dbapi(cls): from postgresql.driver import dbapi20 return dbapi20 _DBAPI_ERROR_NAMES = [ "Error", "InterfaceError", "DatabaseError", "DataError", "OperationalError", "IntegrityError", "InternalError", "ProgrammingError", "NotSupportedError", ] @util.memoized_property def dbapi_exception_translation_map(self): if self.dbapi is None: return {} return dict( (getattr(self.dbapi, name).__name__, name) for name in self._DBAPI_ERROR_NAMES ) def create_connect_args(self, url): opts = url.translate_connect_args(username="user") if "port" in opts: opts["port"] = int(opts["port"]) else: opts["port"] = 5432 opts.update(url.query) return ([], opts) def is_disconnect(self, e, connection, cursor): return "connection is closed" in str(e) dialect = PGDialect_pypostgresql