You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
264 lines
9.1 KiB
264 lines
9.1 KiB
# mysql/enumerated.py
|
|
# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
|
|
# <see AUTHORS file>
|
|
#
|
|
# This module is part of SQLAlchemy and is released under
|
|
# the MIT License: https://www.opensource.org/licenses/mit-license.php
|
|
|
|
import re
|
|
|
|
from .types import _StringType
|
|
from ... import exc
|
|
from ... import sql
|
|
from ... import util
|
|
from ...sql import sqltypes
|
|
from ...sql.base import NO_ARG
|
|
|
|
|
|
class ENUM(sqltypes.NativeForEmulated, sqltypes.Enum, _StringType):
|
|
"""MySQL ENUM type."""
|
|
|
|
__visit_name__ = "ENUM"
|
|
|
|
native_enum = True
|
|
|
|
def __init__(self, *enums, **kw):
|
|
"""Construct an ENUM.
|
|
|
|
E.g.::
|
|
|
|
Column('myenum', ENUM("foo", "bar", "baz"))
|
|
|
|
:param enums: The range of valid values for this ENUM. Values in
|
|
enums are not quoted, they will be escaped and surrounded by single
|
|
quotes when generating the schema. This object may also be a
|
|
PEP-435-compliant enumerated type.
|
|
|
|
.. versionadded: 1.1 added support for PEP-435-compliant enumerated
|
|
types.
|
|
|
|
:param strict: This flag has no effect.
|
|
|
|
.. versionchanged:: The MySQL ENUM type as well as the base Enum
|
|
type now validates all Python data values.
|
|
|
|
:param charset: Optional, a column-level character set for this string
|
|
value. Takes precedence to 'ascii' or 'unicode' short-hand.
|
|
|
|
:param collation: Optional, a column-level collation for this string
|
|
value. Takes precedence to 'binary' short-hand.
|
|
|
|
:param ascii: Defaults to False: short-hand for the ``latin1``
|
|
character set, generates ASCII in schema.
|
|
|
|
:param unicode: Defaults to False: short-hand for the ``ucs2``
|
|
character set, generates UNICODE in schema.
|
|
|
|
:param binary: Defaults to False: short-hand, pick the binary
|
|
collation type that matches the column's character set. Generates
|
|
BINARY in schema. This does not affect the type of data stored,
|
|
only the collation of character data.
|
|
|
|
:param quoting: Not used. A warning will be raised if provided.
|
|
|
|
"""
|
|
if kw.pop("quoting", NO_ARG) is not NO_ARG:
|
|
util.warn_deprecated_20(
|
|
"The 'quoting' parameter to :class:`.mysql.ENUM` is deprecated"
|
|
" and will be removed in a future release. "
|
|
"This parameter now has no effect."
|
|
)
|
|
kw.pop("strict", None)
|
|
self._enum_init(enums, kw)
|
|
_StringType.__init__(self, length=self.length, **kw)
|
|
|
|
@classmethod
|
|
def adapt_emulated_to_native(cls, impl, **kw):
|
|
"""Produce a MySQL native :class:`.mysql.ENUM` from plain
|
|
:class:`.Enum`.
|
|
|
|
"""
|
|
kw.setdefault("validate_strings", impl.validate_strings)
|
|
kw.setdefault("values_callable", impl.values_callable)
|
|
kw.setdefault("omit_aliases", impl._omit_aliases)
|
|
return cls(**kw)
|
|
|
|
def _object_value_for_elem(self, elem):
|
|
# mysql sends back a blank string for any value that
|
|
# was persisted that was not in the enums; that is, it does no
|
|
# validation on the incoming data, it "truncates" it to be
|
|
# the blank string. Return it straight.
|
|
if elem == "":
|
|
return elem
|
|
else:
|
|
return super(ENUM, self)._object_value_for_elem(elem)
|
|
|
|
def __repr__(self):
|
|
return util.generic_repr(
|
|
self, to_inspect=[ENUM, _StringType, sqltypes.Enum]
|
|
)
|
|
|
|
|
|
class SET(_StringType):
|
|
"""MySQL SET type."""
|
|
|
|
__visit_name__ = "SET"
|
|
|
|
def __init__(self, *values, **kw):
|
|
"""Construct a SET.
|
|
|
|
E.g.::
|
|
|
|
Column('myset', SET("foo", "bar", "baz"))
|
|
|
|
|
|
The list of potential values is required in the case that this
|
|
set will be used to generate DDL for a table, or if the
|
|
:paramref:`.SET.retrieve_as_bitwise` flag is set to True.
|
|
|
|
:param values: The range of valid values for this SET. The values
|
|
are not quoted, they will be escaped and surrounded by single
|
|
quotes when generating the schema.
|
|
|
|
:param convert_unicode: Same flag as that of
|
|
:paramref:`.String.convert_unicode`.
|
|
|
|
:param collation: same as that of :paramref:`.String.collation`
|
|
|
|
:param charset: same as that of :paramref:`.VARCHAR.charset`.
|
|
|
|
:param ascii: same as that of :paramref:`.VARCHAR.ascii`.
|
|
|
|
:param unicode: same as that of :paramref:`.VARCHAR.unicode`.
|
|
|
|
:param binary: same as that of :paramref:`.VARCHAR.binary`.
|
|
|
|
:param retrieve_as_bitwise: if True, the data for the set type will be
|
|
persisted and selected using an integer value, where a set is coerced
|
|
into a bitwise mask for persistence. MySQL allows this mode which
|
|
has the advantage of being able to store values unambiguously,
|
|
such as the blank string ``''``. The datatype will appear
|
|
as the expression ``col + 0`` in a SELECT statement, so that the
|
|
value is coerced into an integer value in result sets.
|
|
This flag is required if one wishes
|
|
to persist a set that can store the blank string ``''`` as a value.
|
|
|
|
.. warning::
|
|
|
|
When using :paramref:`.mysql.SET.retrieve_as_bitwise`, it is
|
|
essential that the list of set values is expressed in the
|
|
**exact same order** as exists on the MySQL database.
|
|
|
|
.. versionadded:: 1.0.0
|
|
|
|
:param quoting: Not used. A warning will be raised if passed.
|
|
|
|
"""
|
|
if kw.pop("quoting", NO_ARG) is not NO_ARG:
|
|
util.warn_deprecated_20(
|
|
"The 'quoting' parameter to :class:`.mysql.SET` is deprecated"
|
|
" and will be removed in a future release. "
|
|
"This parameter now has no effect."
|
|
)
|
|
self.retrieve_as_bitwise = kw.pop("retrieve_as_bitwise", False)
|
|
self.values = tuple(values)
|
|
if not self.retrieve_as_bitwise and "" in values:
|
|
raise exc.ArgumentError(
|
|
"Can't use the blank value '' in a SET without "
|
|
"setting retrieve_as_bitwise=True"
|
|
)
|
|
if self.retrieve_as_bitwise:
|
|
self._bitmap = dict(
|
|
(value, 2 ** idx) for idx, value in enumerate(self.values)
|
|
)
|
|
self._bitmap.update(
|
|
(2 ** idx, value) for idx, value in enumerate(self.values)
|
|
)
|
|
length = max([len(v) for v in values] + [0])
|
|
kw.setdefault("length", length)
|
|
super(SET, self).__init__(**kw)
|
|
|
|
def column_expression(self, colexpr):
|
|
if self.retrieve_as_bitwise:
|
|
return sql.type_coerce(
|
|
sql.type_coerce(colexpr, sqltypes.Integer) + 0, self
|
|
)
|
|
else:
|
|
return colexpr
|
|
|
|
def result_processor(self, dialect, coltype):
|
|
if self.retrieve_as_bitwise:
|
|
|
|
def process(value):
|
|
if value is not None:
|
|
value = int(value)
|
|
|
|
return set(util.map_bits(self._bitmap.__getitem__, value))
|
|
else:
|
|
return None
|
|
|
|
else:
|
|
super_convert = super(SET, self).result_processor(dialect, coltype)
|
|
|
|
def process(value):
|
|
if isinstance(value, util.string_types):
|
|
# MySQLdb returns a string, let's parse
|
|
if super_convert:
|
|
value = super_convert(value)
|
|
return set(re.findall(r"[^,]+", value))
|
|
else:
|
|
# mysql-connector-python does a naive
|
|
# split(",") which throws in an empty string
|
|
if value is not None:
|
|
value.discard("")
|
|
return value
|
|
|
|
return process
|
|
|
|
def bind_processor(self, dialect):
|
|
super_convert = super(SET, self).bind_processor(dialect)
|
|
if self.retrieve_as_bitwise:
|
|
|
|
def process(value):
|
|
if value is None:
|
|
return None
|
|
elif isinstance(value, util.int_types + util.string_types):
|
|
if super_convert:
|
|
return super_convert(value)
|
|
else:
|
|
return value
|
|
else:
|
|
int_value = 0
|
|
for v in value:
|
|
int_value |= self._bitmap[v]
|
|
return int_value
|
|
|
|
else:
|
|
|
|
def process(value):
|
|
# accept strings and int (actually bitflag) values directly
|
|
if value is not None and not isinstance(
|
|
value, util.int_types + util.string_types
|
|
):
|
|
value = ",".join(value)
|
|
|
|
if super_convert:
|
|
return super_convert(value)
|
|
else:
|
|
return value
|
|
|
|
return process
|
|
|
|
def adapt(self, impltype, **kw):
|
|
kw["retrieve_as_bitwise"] = self.retrieve_as_bitwise
|
|
return util.constructor_copy(self, impltype, *self.values, **kw)
|
|
|
|
def __repr__(self):
|
|
return util.generic_repr(
|
|
self,
|
|
to_inspect=[SET, _StringType],
|
|
additional_kw=[
|
|
("retrieve_as_bitwise", False),
|
|
],
|
|
)
|