mirror of
https://github.com/moparisthebest/SickRage
synced 2024-12-14 20:12:19 -05:00
622 lines
21 KiB
Python
622 lines
21 KiB
Python
# sql/base.py
|
|
# Copyright (C) 2005-2014 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
|
|
|
|
"""Foundational utilities common to many sql modules.
|
|
|
|
"""
|
|
|
|
|
|
from .. import util, exc
|
|
import itertools
|
|
from .visitors import ClauseVisitor
|
|
import re
|
|
import collections
|
|
|
|
PARSE_AUTOCOMMIT = util.symbol('PARSE_AUTOCOMMIT')
|
|
NO_ARG = util.symbol('NO_ARG')
|
|
|
|
class Immutable(object):
|
|
"""mark a ClauseElement as 'immutable' when expressions are cloned."""
|
|
|
|
def unique_params(self, *optionaldict, **kwargs):
|
|
raise NotImplementedError("Immutable objects do not support copying")
|
|
|
|
def params(self, *optionaldict, **kwargs):
|
|
raise NotImplementedError("Immutable objects do not support copying")
|
|
|
|
def _clone(self):
|
|
return self
|
|
|
|
|
|
|
|
def _from_objects(*elements):
|
|
return itertools.chain(*[element._from_objects for element in elements])
|
|
|
|
@util.decorator
|
|
def _generative(fn, *args, **kw):
|
|
"""Mark a method as generative."""
|
|
|
|
self = args[0]._generate()
|
|
fn(self, *args[1:], **kw)
|
|
return self
|
|
|
|
|
|
class _DialectArgView(collections.MutableMapping):
|
|
"""A dictionary view of dialect-level arguments in the form
|
|
<dialectname>_<argument_name>.
|
|
|
|
"""
|
|
def __init__(self, obj):
|
|
self.obj = obj
|
|
|
|
def _key(self, key):
|
|
try:
|
|
dialect, value_key = key.split("_", 1)
|
|
except ValueError:
|
|
raise KeyError(key)
|
|
else:
|
|
return dialect, value_key
|
|
|
|
def __getitem__(self, key):
|
|
dialect, value_key = self._key(key)
|
|
|
|
try:
|
|
opt = self.obj.dialect_options[dialect]
|
|
except exc.NoSuchModuleError:
|
|
raise KeyError(key)
|
|
else:
|
|
return opt[value_key]
|
|
|
|
def __setitem__(self, key, value):
|
|
try:
|
|
dialect, value_key = self._key(key)
|
|
except KeyError:
|
|
raise exc.ArgumentError(
|
|
"Keys must be of the form <dialectname>_<argname>")
|
|
else:
|
|
self.obj.dialect_options[dialect][value_key] = value
|
|
|
|
def __delitem__(self, key):
|
|
dialect, value_key = self._key(key)
|
|
del self.obj.dialect_options[dialect][value_key]
|
|
|
|
def __len__(self):
|
|
return sum(len(args._non_defaults) for args in
|
|
self.obj.dialect_options.values())
|
|
|
|
def __iter__(self):
|
|
return (
|
|
"%s_%s" % (dialect_name, value_name)
|
|
for dialect_name in self.obj.dialect_options
|
|
for value_name in self.obj.dialect_options[dialect_name]._non_defaults
|
|
)
|
|
|
|
class _DialectArgDict(collections.MutableMapping):
|
|
"""A dictionary view of dialect-level arguments for a specific
|
|
dialect.
|
|
|
|
Maintains a separate collection of user-specified arguments
|
|
and dialect-specified default arguments.
|
|
|
|
"""
|
|
def __init__(self):
|
|
self._non_defaults = {}
|
|
self._defaults = {}
|
|
|
|
def __len__(self):
|
|
return len(set(self._non_defaults).union(self._defaults))
|
|
|
|
def __iter__(self):
|
|
return iter(set(self._non_defaults).union(self._defaults))
|
|
|
|
def __getitem__(self, key):
|
|
if key in self._non_defaults:
|
|
return self._non_defaults[key]
|
|
else:
|
|
return self._defaults[key]
|
|
|
|
def __setitem__(self, key, value):
|
|
self._non_defaults[key] = value
|
|
|
|
def __delitem__(self, key):
|
|
del self._non_defaults[key]
|
|
|
|
|
|
class DialectKWArgs(object):
|
|
"""Establish the ability for a class to have dialect-specific arguments
|
|
with defaults and constructor validation.
|
|
|
|
The :class:`.DialectKWArgs` interacts with the
|
|
:attr:`.DefaultDialect.construct_arguments` present on a dialect.
|
|
|
|
.. seealso::
|
|
|
|
:attr:`.DefaultDialect.construct_arguments`
|
|
|
|
"""
|
|
|
|
@classmethod
|
|
def argument_for(cls, dialect_name, argument_name, default):
|
|
"""Add a new kind of dialect-specific keyword argument for this class.
|
|
|
|
E.g.::
|
|
|
|
Index.argument_for("mydialect", "length", None)
|
|
|
|
some_index = Index('a', 'b', mydialect_length=5)
|
|
|
|
The :meth:`.DialectKWArgs.argument_for` method is a per-argument
|
|
way adding extra arguments to the :attr:`.DefaultDialect.construct_arguments`
|
|
dictionary. This dictionary provides a list of argument names accepted by
|
|
various schema-level constructs on behalf of a dialect.
|
|
|
|
New dialects should typically specify this dictionary all at once as a data
|
|
member of the dialect class. The use case for ad-hoc addition of
|
|
argument names is typically for end-user code that is also using
|
|
a custom compilation scheme which consumes the additional arguments.
|
|
|
|
:param dialect_name: name of a dialect. The dialect must be locatable,
|
|
else a :class:`.NoSuchModuleError` is raised. The dialect must
|
|
also include an existing :attr:`.DefaultDialect.construct_arguments` collection,
|
|
indicating that it participates in the keyword-argument validation and
|
|
default system, else :class:`.ArgumentError` is raised.
|
|
If the dialect does not include this collection, then any keyword argument
|
|
can be specified on behalf of this dialect already. All dialects
|
|
packaged within SQLAlchemy include this collection, however for third
|
|
party dialects, support may vary.
|
|
|
|
:param argument_name: name of the parameter.
|
|
|
|
:param default: default value of the parameter.
|
|
|
|
.. versionadded:: 0.9.4
|
|
|
|
"""
|
|
|
|
construct_arg_dictionary = DialectKWArgs._kw_registry[dialect_name]
|
|
if construct_arg_dictionary is None:
|
|
raise exc.ArgumentError("Dialect '%s' does have keyword-argument "
|
|
"validation and defaults enabled configured" %
|
|
dialect_name)
|
|
construct_arg_dictionary[cls][argument_name] = default
|
|
|
|
@util.memoized_property
|
|
def dialect_kwargs(self):
|
|
"""A collection of keyword arguments specified as dialect-specific
|
|
options to this construct.
|
|
|
|
The arguments are present here in their original ``<dialect>_<kwarg>``
|
|
format. Only arguments that were actually passed are included;
|
|
unlike the :attr:`.DialectKWArgs.dialect_options` collection, which
|
|
contains all options known by this dialect including defaults.
|
|
|
|
The collection is also writable; keys are accepted of the
|
|
form ``<dialect>_<kwarg>`` where the value will be assembled
|
|
into the list of options.
|
|
|
|
.. versionadded:: 0.9.2
|
|
|
|
.. versionchanged:: 0.9.4 The :attr:`.DialectKWArgs.dialect_kwargs`
|
|
collection is now writable.
|
|
|
|
.. seealso::
|
|
|
|
:attr:`.DialectKWArgs.dialect_options` - nested dictionary form
|
|
|
|
"""
|
|
return _DialectArgView(self)
|
|
|
|
@property
|
|
def kwargs(self):
|
|
"""A synonym for :attr:`.DialectKWArgs.dialect_kwargs`."""
|
|
return self.dialect_kwargs
|
|
|
|
@util.dependencies("sqlalchemy.dialects")
|
|
def _kw_reg_for_dialect(dialects, dialect_name):
|
|
dialect_cls = dialects.registry.load(dialect_name)
|
|
if dialect_cls.construct_arguments is None:
|
|
return None
|
|
return dict(dialect_cls.construct_arguments)
|
|
_kw_registry = util.PopulateDict(_kw_reg_for_dialect)
|
|
|
|
def _kw_reg_for_dialect_cls(self, dialect_name):
|
|
construct_arg_dictionary = DialectKWArgs._kw_registry[dialect_name]
|
|
d = _DialectArgDict()
|
|
|
|
if construct_arg_dictionary is None:
|
|
d._defaults.update({"*": None})
|
|
else:
|
|
for cls in reversed(self.__class__.__mro__):
|
|
if cls in construct_arg_dictionary:
|
|
d._defaults.update(construct_arg_dictionary[cls])
|
|
return d
|
|
|
|
@util.memoized_property
|
|
def dialect_options(self):
|
|
"""A collection of keyword arguments specified as dialect-specific
|
|
options to this construct.
|
|
|
|
This is a two-level nested registry, keyed to ``<dialect_name>``
|
|
and ``<argument_name>``. For example, the ``postgresql_where`` argument
|
|
would be locatable as::
|
|
|
|
arg = my_object.dialect_options['postgresql']['where']
|
|
|
|
.. versionadded:: 0.9.2
|
|
|
|
.. seealso::
|
|
|
|
:attr:`.DialectKWArgs.dialect_kwargs` - flat dictionary form
|
|
|
|
"""
|
|
|
|
return util.PopulateDict(
|
|
util.portable_instancemethod(self._kw_reg_for_dialect_cls)
|
|
)
|
|
|
|
def _validate_dialect_kwargs(self, kwargs):
|
|
# validate remaining kwargs that they all specify DB prefixes
|
|
|
|
if not kwargs:
|
|
return
|
|
|
|
for k in kwargs:
|
|
m = re.match('^(.+?)_(.+)$', k)
|
|
if not m:
|
|
raise TypeError("Additional arguments should be "
|
|
"named <dialectname>_<argument>, got '%s'" % k)
|
|
dialect_name, arg_name = m.group(1, 2)
|
|
|
|
try:
|
|
construct_arg_dictionary = self.dialect_options[dialect_name]
|
|
except exc.NoSuchModuleError:
|
|
util.warn(
|
|
"Can't validate argument %r; can't "
|
|
"locate any SQLAlchemy dialect named %r" %
|
|
(k, dialect_name))
|
|
self.dialect_options[dialect_name] = d = _DialectArgDict()
|
|
d._defaults.update({"*": None})
|
|
d._non_defaults[arg_name] = kwargs[k]
|
|
else:
|
|
if "*" not in construct_arg_dictionary and \
|
|
arg_name not in construct_arg_dictionary:
|
|
raise exc.ArgumentError(
|
|
"Argument %r is not accepted by "
|
|
"dialect %r on behalf of %r" % (
|
|
k,
|
|
dialect_name, self.__class__
|
|
))
|
|
else:
|
|
construct_arg_dictionary[arg_name] = kwargs[k]
|
|
|
|
|
|
class Generative(object):
|
|
"""Allow a ClauseElement to generate itself via the
|
|
@_generative decorator.
|
|
|
|
"""
|
|
|
|
def _generate(self):
|
|
s = self.__class__.__new__(self.__class__)
|
|
s.__dict__ = self.__dict__.copy()
|
|
return s
|
|
|
|
|
|
class Executable(Generative):
|
|
"""Mark a ClauseElement as supporting execution.
|
|
|
|
:class:`.Executable` is a superclass for all "statement" types
|
|
of objects, including :func:`select`, :func:`delete`, :func:`update`,
|
|
:func:`insert`, :func:`text`.
|
|
|
|
"""
|
|
|
|
supports_execution = True
|
|
_execution_options = util.immutabledict()
|
|
_bind = None
|
|
|
|
@_generative
|
|
def execution_options(self, **kw):
|
|
""" Set non-SQL options for the statement which take effect during
|
|
execution.
|
|
|
|
Execution options can be set on a per-statement or
|
|
per :class:`.Connection` basis. Additionally, the
|
|
:class:`.Engine` and ORM :class:`~.orm.query.Query` objects provide
|
|
access to execution options which they in turn configure upon
|
|
connections.
|
|
|
|
The :meth:`execution_options` method is generative. A new
|
|
instance of this statement is returned that contains the options::
|
|
|
|
statement = select([table.c.x, table.c.y])
|
|
statement = statement.execution_options(autocommit=True)
|
|
|
|
Note that only a subset of possible execution options can be applied
|
|
to a statement - these include "autocommit" and "stream_results",
|
|
but not "isolation_level" or "compiled_cache".
|
|
See :meth:`.Connection.execution_options` for a full list of
|
|
possible options.
|
|
|
|
.. seealso::
|
|
|
|
:meth:`.Connection.execution_options()`
|
|
|
|
:meth:`.Query.execution_options()`
|
|
|
|
"""
|
|
if 'isolation_level' in kw:
|
|
raise exc.ArgumentError(
|
|
"'isolation_level' execution option may only be specified "
|
|
"on Connection.execution_options(), or "
|
|
"per-engine using the isolation_level "
|
|
"argument to create_engine()."
|
|
)
|
|
if 'compiled_cache' in kw:
|
|
raise exc.ArgumentError(
|
|
"'compiled_cache' execution option may only be specified "
|
|
"on Connection.execution_options(), not per statement."
|
|
)
|
|
self._execution_options = self._execution_options.union(kw)
|
|
|
|
def execute(self, *multiparams, **params):
|
|
"""Compile and execute this :class:`.Executable`."""
|
|
e = self.bind
|
|
if e is None:
|
|
label = getattr(self, 'description', self.__class__.__name__)
|
|
msg = ('This %s is not directly bound to a Connection or Engine.'
|
|
'Use the .execute() method of a Connection or Engine '
|
|
'to execute this construct.' % label)
|
|
raise exc.UnboundExecutionError(msg)
|
|
return e._execute_clauseelement(self, multiparams, params)
|
|
|
|
def scalar(self, *multiparams, **params):
|
|
"""Compile and execute this :class:`.Executable`, returning the
|
|
result's scalar representation.
|
|
|
|
"""
|
|
return self.execute(*multiparams, **params).scalar()
|
|
|
|
@property
|
|
def bind(self):
|
|
"""Returns the :class:`.Engine` or :class:`.Connection` to
|
|
which this :class:`.Executable` is bound, or None if none found.
|
|
|
|
This is a traversal which checks locally, then
|
|
checks among the "from" clauses of associated objects
|
|
until a bound engine or connection is found.
|
|
|
|
"""
|
|
if self._bind is not None:
|
|
return self._bind
|
|
|
|
for f in _from_objects(self):
|
|
if f is self:
|
|
continue
|
|
engine = f.bind
|
|
if engine is not None:
|
|
return engine
|
|
else:
|
|
return None
|
|
|
|
|
|
class SchemaEventTarget(object):
|
|
"""Base class for elements that are the targets of :class:`.DDLEvents`
|
|
events.
|
|
|
|
This includes :class:`.SchemaItem` as well as :class:`.SchemaType`.
|
|
|
|
"""
|
|
|
|
def _set_parent(self, parent):
|
|
"""Associate with this SchemaEvent's parent object."""
|
|
|
|
raise NotImplementedError()
|
|
|
|
def _set_parent_with_dispatch(self, parent):
|
|
self.dispatch.before_parent_attach(self, parent)
|
|
self._set_parent(parent)
|
|
self.dispatch.after_parent_attach(self, parent)
|
|
|
|
class SchemaVisitor(ClauseVisitor):
|
|
"""Define the visiting for ``SchemaItem`` objects."""
|
|
|
|
__traverse_options__ = {'schema_visitor': True}
|
|
|
|
class ColumnCollection(util.OrderedProperties):
|
|
"""An ordered dictionary that stores a list of ColumnElement
|
|
instances.
|
|
|
|
Overrides the ``__eq__()`` method to produce SQL clauses between
|
|
sets of correlated columns.
|
|
|
|
"""
|
|
|
|
def __init__(self):
|
|
super(ColumnCollection, self).__init__()
|
|
self.__dict__['_all_col_set'] = util.column_set()
|
|
self.__dict__['_all_columns'] = []
|
|
|
|
def __str__(self):
|
|
return repr([str(c) for c in self])
|
|
|
|
def replace(self, column):
|
|
"""add the given column to this collection, removing unaliased
|
|
versions of this column as well as existing columns with the
|
|
same key.
|
|
|
|
e.g.::
|
|
|
|
t = Table('sometable', metadata, Column('col1', Integer))
|
|
t.columns.replace(Column('col1', Integer, key='columnone'))
|
|
|
|
will remove the original 'col1' from the collection, and add
|
|
the new column under the name 'columnname'.
|
|
|
|
Used by schema.Column to override columns during table reflection.
|
|
|
|
"""
|
|
remove_col = None
|
|
if column.name in self and column.key != column.name:
|
|
other = self[column.name]
|
|
if other.name == other.key:
|
|
remove_col = other
|
|
self._all_col_set.remove(other)
|
|
del self._data[other.key]
|
|
|
|
if column.key in self._data:
|
|
remove_col = self._data[column.key]
|
|
self._all_col_set.remove(remove_col)
|
|
|
|
self._all_col_set.add(column)
|
|
self._data[column.key] = column
|
|
if remove_col is not None:
|
|
self._all_columns[:] = [column if c is remove_col
|
|
else c for c in self._all_columns]
|
|
else:
|
|
self._all_columns.append(column)
|
|
|
|
|
|
def add(self, column):
|
|
"""Add a column to this collection.
|
|
|
|
The key attribute of the column will be used as the hash key
|
|
for this dictionary.
|
|
|
|
"""
|
|
self[column.key] = column
|
|
|
|
def __delitem__(self, key):
|
|
raise NotImplementedError()
|
|
|
|
def __setattr__(self, key, object):
|
|
raise NotImplementedError()
|
|
|
|
def __setitem__(self, key, value):
|
|
if key in self:
|
|
|
|
# this warning is primarily to catch select() statements
|
|
# which have conflicting column names in their exported
|
|
# columns collection
|
|
|
|
existing = self[key]
|
|
if not existing.shares_lineage(value):
|
|
util.warn('Column %r on table %r being replaced by '
|
|
'%r, which has the same key. Consider '
|
|
'use_labels for select() statements.' % (key,
|
|
getattr(existing, 'table', None), value))
|
|
|
|
# pop out memoized proxy_set as this
|
|
# operation may very well be occurring
|
|
# in a _make_proxy operation
|
|
util.memoized_property.reset(value, "proxy_set")
|
|
|
|
self._all_col_set.add(value)
|
|
self._all_columns.append(value)
|
|
self._data[key] = value
|
|
|
|
def clear(self):
|
|
raise NotImplementedError()
|
|
|
|
def remove(self, column):
|
|
del self._data[column.key]
|
|
self._all_col_set.remove(column)
|
|
self._all_columns[:] = [c for c in self._all_columns if c is not column]
|
|
|
|
def update(self, iter):
|
|
cols = list(iter)
|
|
self._all_columns.extend(c for label, c in cols if c not in self._all_col_set)
|
|
self._all_col_set.update(c for label, c in cols)
|
|
self._data.update((label, c) for label, c in cols)
|
|
|
|
def extend(self, iter):
|
|
cols = list(iter)
|
|
self._all_columns.extend(c for c in cols if c not in self._all_col_set)
|
|
self._all_col_set.update(cols)
|
|
self._data.update((c.key, c) for c in cols)
|
|
|
|
__hash__ = None
|
|
|
|
@util.dependencies("sqlalchemy.sql.elements")
|
|
def __eq__(self, elements, other):
|
|
l = []
|
|
for c in getattr(other, "_all_columns", other):
|
|
for local in self._all_columns:
|
|
if c.shares_lineage(local):
|
|
l.append(c == local)
|
|
return elements.and_(*l)
|
|
|
|
def __contains__(self, other):
|
|
if not isinstance(other, util.string_types):
|
|
raise exc.ArgumentError("__contains__ requires a string argument")
|
|
return util.OrderedProperties.__contains__(self, other)
|
|
|
|
def __getstate__(self):
|
|
return {'_data': self.__dict__['_data'],
|
|
'_all_columns': self.__dict__['_all_columns']}
|
|
|
|
def __setstate__(self, state):
|
|
self.__dict__['_data'] = state['_data']
|
|
self.__dict__['_all_columns'] = state['_all_columns']
|
|
self.__dict__['_all_col_set'] = util.column_set(state['_all_columns'])
|
|
|
|
def contains_column(self, col):
|
|
# this has to be done via set() membership
|
|
return col in self._all_col_set
|
|
|
|
def as_immutable(self):
|
|
return ImmutableColumnCollection(self._data, self._all_col_set, self._all_columns)
|
|
|
|
|
|
class ImmutableColumnCollection(util.ImmutableProperties, ColumnCollection):
|
|
def __init__(self, data, colset, all_columns):
|
|
util.ImmutableProperties.__init__(self, data)
|
|
self.__dict__['_all_col_set'] = colset
|
|
self.__dict__['_all_columns'] = all_columns
|
|
|
|
extend = remove = util.ImmutableProperties._immutable
|
|
|
|
|
|
class ColumnSet(util.ordered_column_set):
|
|
def contains_column(self, col):
|
|
return col in self
|
|
|
|
def extend(self, cols):
|
|
for col in cols:
|
|
self.add(col)
|
|
|
|
def __add__(self, other):
|
|
return list(self) + list(other)
|
|
|
|
@util.dependencies("sqlalchemy.sql.elements")
|
|
def __eq__(self, elements, other):
|
|
l = []
|
|
for c in other:
|
|
for local in self:
|
|
if c.shares_lineage(local):
|
|
l.append(c == local)
|
|
return elements.and_(*l)
|
|
|
|
def __hash__(self):
|
|
return hash(tuple(x for x in self))
|
|
|
|
def _bind_or_error(schemaitem, msg=None):
|
|
bind = schemaitem.bind
|
|
if not bind:
|
|
name = schemaitem.__class__.__name__
|
|
label = getattr(schemaitem, 'fullname',
|
|
getattr(schemaitem, 'name', None))
|
|
if label:
|
|
item = '%s object %r' % (name, label)
|
|
else:
|
|
item = '%s object' % name
|
|
if msg is None:
|
|
msg = "%s is not bound to an Engine or Connection. "\
|
|
"Execution can not proceed without a database to execute "\
|
|
"against." % item
|
|
raise exc.UnboundExecutionError(msg)
|
|
return bind
|