mirror of
https://github.com/JonathanHerrewijnen/calibre-web.git
synced 2024-11-14 23:20:24 +00:00
125 lines
3.7 KiB
Python
125 lines
3.7 KiB
Python
# postgresql/pg8000.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:: postgresql+pg8000
|
|
:name: pg8000
|
|
:dbapi: pg8000
|
|
:connectstring: postgresql+pg8000://user:password@host:port/dbname[?key=value&key=value...]
|
|
:url: http://pybrary.net/pg8000/
|
|
|
|
Unicode
|
|
-------
|
|
|
|
pg8000 requires that the postgresql client encoding be
|
|
configured in the postgresql.conf file in order to use encodings
|
|
other than ascii. Set this value to the same value as the
|
|
"encoding" parameter on create_engine(), usually "utf-8".
|
|
|
|
Interval
|
|
--------
|
|
|
|
Passing data from/to the Interval type is not supported as of
|
|
yet.
|
|
|
|
"""
|
|
from ... import util, exc
|
|
import decimal
|
|
from ... import processors
|
|
from ... import types as sqltypes
|
|
from .base import PGDialect, \
|
|
PGCompiler, PGIdentifierPreparer, PGExecutionContext,\
|
|
_DECIMAL_TYPES, _FLOAT_TYPES, _INT_TYPES
|
|
|
|
|
|
class _PGNumeric(sqltypes.Numeric):
|
|
def result_processor(self, dialect, coltype):
|
|
if self.asdecimal:
|
|
if coltype in _FLOAT_TYPES:
|
|
return processors.to_decimal_processor_factory(decimal.Decimal)
|
|
elif coltype in _DECIMAL_TYPES or coltype in _INT_TYPES:
|
|
# pg8000 returns Decimal natively for 1700
|
|
return None
|
|
else:
|
|
raise exc.InvalidRequestError(
|
|
"Unknown PG numeric type: %d" % coltype)
|
|
else:
|
|
if coltype in _FLOAT_TYPES:
|
|
# pg8000 returns float natively for 701
|
|
return None
|
|
elif coltype in _DECIMAL_TYPES or coltype in _INT_TYPES:
|
|
return processors.to_float
|
|
else:
|
|
raise exc.InvalidRequestError(
|
|
"Unknown PG numeric type: %d" % coltype)
|
|
|
|
|
|
class _PGNumericNoBind(_PGNumeric):
|
|
def bind_processor(self, dialect):
|
|
return None
|
|
|
|
|
|
class PGExecutionContext_pg8000(PGExecutionContext):
|
|
pass
|
|
|
|
|
|
class PGCompiler_pg8000(PGCompiler):
|
|
def visit_mod_binary(self, binary, operator, **kw):
|
|
return self.process(binary.left, **kw) + " %% " + \
|
|
self.process(binary.right, **kw)
|
|
|
|
def post_process_text(self, text):
|
|
if '%%' in text:
|
|
util.warn("The SQLAlchemy postgresql dialect "
|
|
"now automatically escapes '%' in text() "
|
|
"expressions to '%%'.")
|
|
return text.replace('%', '%%')
|
|
|
|
|
|
class PGIdentifierPreparer_pg8000(PGIdentifierPreparer):
|
|
def _escape_identifier(self, value):
|
|
value = value.replace(self.escape_quote, self.escape_to_quote)
|
|
return value.replace('%', '%%')
|
|
|
|
|
|
class PGDialect_pg8000(PGDialect):
|
|
driver = 'pg8000'
|
|
|
|
supports_unicode_statements = True
|
|
|
|
supports_unicode_binds = True
|
|
|
|
default_paramstyle = 'format'
|
|
supports_sane_multi_rowcount = False
|
|
execution_ctx_cls = PGExecutionContext_pg8000
|
|
statement_compiler = PGCompiler_pg8000
|
|
preparer = PGIdentifierPreparer_pg8000
|
|
description_encoding = 'use_encoding'
|
|
|
|
colspecs = util.update_copy(
|
|
PGDialect.colspecs,
|
|
{
|
|
sqltypes.Numeric: _PGNumericNoBind,
|
|
sqltypes.Float: _PGNumeric
|
|
}
|
|
)
|
|
|
|
@classmethod
|
|
def dbapi(cls):
|
|
return __import__('pg8000').dbapi
|
|
|
|
def create_connect_args(self, url):
|
|
opts = url.translate_connect_args(username='user')
|
|
if 'port' in opts:
|
|
opts['port'] = int(opts['port'])
|
|
opts.update(url.query)
|
|
return ([], opts)
|
|
|
|
def is_disconnect(self, e, connection, cursor):
|
|
return "connection is closed" in str(e)
|
|
|
|
dialect = PGDialect_pg8000
|