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authorcyfraeviolae <cyfraeviolae>2024-04-03 03:10:44 -0400
committercyfraeviolae <cyfraeviolae>2024-04-03 03:10:44 -0400
commit6d7ba58f880be618ade07f8ea080fe8c4bf8a896 (patch)
treeb1c931051ffcebd2bd9d61d98d6233ffa289bbce /venv/lib/python3.11/site-packages/sqlalchemy/dialects/mysql/enumerated.py
parent4f884c9abc32990b4061a1bb6997b4b37e58ea0b (diff)
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+# dialects/mysql/enumerated.py
+# Copyright (C) 2005-2024 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
+# mypy: ignore-errors
+
+
+import re
+
+from .types import _StringType
+from ... import exc
+from ... import sql
+from ... import util
+from ...sql import sqltypes
+
+
+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.
+
+ """
+ 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()._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.
+
+ """
+ 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 = {
+ 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().__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().result_processor(dialect, coltype)
+
+ def process(value):
+ if isinstance(value, str):
+ # 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().bind_processor(dialect)
+ if self.retrieve_as_bitwise:
+
+ def process(value):
+ if value is None:
+ return None
+ elif isinstance(value, (int, str)):
+ 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, (int, str)):
+ 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),
+ ],
+ )