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# Copyright (c) 2006-2010 Canonical
#
# Written by Gustavo Niemeyer <gustavo@niemeyer.net>
#
# This file is part of Storm Object Relational Mapper.
#
# Storm is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of
# the License, or (at your option) any later version.
#
# Storm is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""A SQLObject emulation layer for Storm.
L{SQLObjectBase} is the central point of compatibility.
"""
import re
import warnings
from storm.properties import (
RawStr, Int, Bool, Float, DateTime, Date, TimeDelta)
from storm.references import Reference, ReferenceSet
from storm.properties import SimpleProperty, PropertyPublisherMeta
from storm.variables import Variable
from storm.exceptions import StormError, NotOneError
from storm.info import get_cls_info, ClassAlias
from storm.store import AutoReload, Store
from storm.base import Storm
from storm.expr import (
SQL, SQLRaw, Desc, And, Or, Not, In, Like, AutoTables, LeftJoin, Column,
compare_columns)
from storm.tz import tzutc
from storm import Undef
__all__ = [
"SQLObjectBase", "StringCol", "IntCol", "BoolCol", "FloatCol",
"DateCol", "UtcDateTimeCol", "IntervalCol", "ForeignKey",
"SQLMultipleJoin", "SQLRelatedJoin", "SingleJoin", "DESC",
"AND", "OR", "NOT", "IN", "LIKE", "SQLConstant",
"CONTAINSSTRING", "SQLObjectMoreThanOneResultError", "SQLObjectNotFound",
"SQLObjectResultSet"]
DESC, AND, OR, NOT, IN, LIKE, SQLConstant = Desc, And, Or, Not, In, Like, SQL
SQLObjectMoreThanOneResultError = NotOneError
_IGNORED = object()
class SQLObjectNotFound(StormError):
pass
class SQLObjectStyle(object):
longID = False
def idForTable(self, table_name):
if self.longID:
return self.tableReference(table_name)
else:
return "id"
def pythonClassToAttr(self, class_name):
return self._lowerword(class_name)
def instanceAttrToIDAttr(self, attr_name):
return attr_name + "ID"
def pythonAttrToDBColumn(self, attr_name):
return self._mixed_to_under(attr_name)
def dbColumnToPythonAttr(self, column_name):
return self._under_to_mixed(column_name)
def pythonClassToDBTable(self, class_name):
return class_name[0].lower()+self._mixed_to_under(class_name[1:])
def dbTableToPythonClass(self, table_name):
return table_name[0].upper()+self._under_to_mixed(table_name[1:])
def pythonClassToDBTableReference(self, class_name):
return self.tableReference(self.pythonClassToDBTable(class_name))
def tableReference(self, table_name):
return table_name+"_id"
def _mixed_to_under(self, name, _re=re.compile("[A-Z]+")):
if name.endswith("ID"):
return self._mixed_to_under(name[:-2]+"_id")
name = _re.sub(self._mixed_to_under_sub, name)
if name.startswith("_"):
return name[1:]
return name
def _mixed_to_under_sub(self, match):
m = match.group(0).lower()
if len(m) > 1:
return "_%s_%s" % (m[:-1], m[-1])
else:
return "_%s" % m
def _under_to_mixed(self, name, _re=re.compile("_.")):
if name.endswith("_id"):
return self._under_to_mixed(name[:-3] + "ID")
return _re.sub(self._under_to_mixed_sub, name)
def _under_to_mixed_sub(self, match):
return match.group(0)[1].upper()
@staticmethod
def _capword(s):
return s[0].upper() + s[1:]
@staticmethod
def _lowerword(s):
return s[0].lower() + s[1:]
class SQLObjectMeta(PropertyPublisherMeta):
@staticmethod
def _get_attr(attr, bases, dict):
value = dict.get(attr)
if value is None:
for base in bases:
value = getattr(base, attr, None)
if value is not None:
break
return value
def __new__(cls, name, bases, dict):
if Storm in bases or SQLObjectBase in bases:
# Do not parse abstract base classes.
return type.__new__(cls, name, bases, dict)
style = cls._get_attr("_style", bases, dict)
if style is None:
dict["_style"] = style = SQLObjectStyle()
table_name = cls._get_attr("_table", bases, dict)
if table_name is None:
table_name = style.pythonClassToDBTable(name)
id_name = cls._get_attr("_idName", bases, dict)
if id_name is None:
id_name = style.idForTable(table_name)
# Handle this later to call _parse_orderBy() on the created class.
default_order = cls._get_attr("_defaultOrder", bases, dict)
dict["__storm_table__"] = table_name
attr_to_prop = {}
for attr, prop in dict.items():
attr_to_prop[attr] = attr
if isinstance(prop, ForeignKey):
db_name = prop.kwargs.get("dbName", attr)
local_prop_name = style.instanceAttrToIDAttr(attr)
dict[local_prop_name] = local_prop = Int(
db_name, allow_none=not prop.kwargs.get("notNull", False),
validator=prop.kwargs.get("storm_validator", None))
dict[attr] = Reference(local_prop,
"%s.<primary key>" % prop.foreignKey)
attr_to_prop[attr] = local_prop_name
elif isinstance(prop, PropertyAdapter):
db_name = prop.dbName or attr
method_name = prop.alternateMethodName
if method_name is None and prop.alternateID:
method_name = "by" + db_name[0].upper() + db_name[1:]
if method_name is not None:
def func(cls, key, attr=attr):
store = cls._get_store()
obj = store.find(cls, getattr(cls, attr) == key).one()
if obj is None:
raise SQLObjectNotFound
return obj
func.func_name = method_name
dict[method_name] = classmethod(func)
elif isinstance(prop, SQLMultipleJoin):
# Generate addFoo/removeFoo names.
def define_add_remove(dict, prop):
capitalised_name = (prop._otherClass[0].capitalize() +
prop._otherClass[1:])
def add(self, obj):
prop._get_bound_reference_set(self).add(obj)
add.__name__ = "add" + capitalised_name
dict.setdefault(add.__name__, add)
def remove(self, obj):
prop._get_bound_reference_set(self).remove(obj)
remove.__name__ = "remove" + capitalised_name
dict.setdefault(remove.__name__, remove)
define_add_remove(dict, prop)
id_type = dict.setdefault("_idType", int)
id_cls = {int: Int, str: RawStr, unicode: AutoUnicode}[id_type]
dict["id"] = id_cls(id_name, primary=True, default=AutoReload)
attr_to_prop[id_name] = "id"
# Notice that obj is the class since this is the metaclass.
obj = super(SQLObjectMeta, cls).__new__(cls, name, bases, dict)
property_registry = obj._storm_property_registry
property_registry.add_property(obj, getattr(obj, "id"),
"<primary key>")
# Let's explore this same mechanism to register table names,
# so that we can find them to handle prejoinClauseTables.
property_registry.add_property(obj, getattr(obj, "id"),
"<table %s>" % table_name)
for fake_name, real_name in attr_to_prop.items():
prop = getattr(obj, real_name)
if fake_name != real_name:
property_registry.add_property(obj, prop, fake_name)
attr_to_prop[fake_name] = prop
obj._attr_to_prop = attr_to_prop
if default_order is not None:
cls_info = get_cls_info(obj)
cls_info.default_order = obj._parse_orderBy(default_order)
return obj
class DotQ(object):
"""A descriptor that mimics the SQLObject 'Table.q' syntax"""
def __get__(self, obj, cls=None):
return BoundDotQ(cls)
class BoundDotQ(object):
def __init__(self, cls):
self._cls = cls
def __getattr__(self, attr):
if attr.startswith("__"):
raise AttributeError(attr)
elif attr == "id":
cls_info = get_cls_info(self._cls)
return cls_info.primary_key[0]
else:
return getattr(self._cls, attr)
class SQLObjectBase(Storm):
"""The root class of all SQLObject-emulating classes in your application.
The general strategy for using Storm's SQLObject emulation layer
is to create an application-specific subclass of SQLObjectBase
(probably named "SQLObject") that provides an implementation of
_get_store to return an instance of L{storm.store.Store}. It may
even be implemented as returning a global L{Store} instance. Then
all database classes should subclass that class.
"""
__metaclass__ = SQLObjectMeta
q = DotQ()
_SO_creating = False
def __init__(self, *args, **kwargs):
store = self._get_store()
store.add(self)
try:
self._create(None, **kwargs)
except:
store.remove(self)
raise
def __storm_loaded__(self):
self._init(None)
def _init(self, id, *args, **kwargs):
pass
def _create(self, _id_, **kwargs):
self._SO_creating = True
self.set(**kwargs)
del self._SO_creating
self._init(None)
def set(self, **kwargs):
for attr, value in kwargs.iteritems():
setattr(self, attr, value)
def destroySelf(self):
Store.of(self).remove(self)
@staticmethod
def _get_store():
raise NotImplementedError("SQLObjectBase._get_store() "
"must be implemented")
@classmethod
def delete(cls, id):
# destroySelf() should be extended to support cascading, so
# we'll mimic what SQLObject does here, even if more expensive.
obj = cls.get(id)
obj.destroySelf()
@classmethod
def get(cls, id):
id = cls._idType(id)
store = cls._get_store()
obj = store.get(cls, id)
if obj is None:
raise SQLObjectNotFound("Object not found")
return obj
@classmethod
def _parse_orderBy(cls, orderBy):
result = []
if not isinstance(orderBy, (tuple, list)):
orderBy = (orderBy,)
for item in orderBy:
if isinstance(item, basestring):
desc = item.startswith("-")
if desc:
item = item[1:]
item = cls._attr_to_prop.get(item, item)
if desc:
item = Desc(item)
result.append(item)
return tuple(result)
@classmethod
def select(cls, *args, **kwargs):
return SQLObjectResultSet(cls, *args, **kwargs)
@classmethod
def selectBy(cls, orderBy=None, **kwargs):
return SQLObjectResultSet(cls, orderBy=orderBy, by=kwargs)
@classmethod
def selectOne(cls, *args, **kwargs):
return SQLObjectResultSet(cls, *args, **kwargs)._one()
@classmethod
def selectOneBy(cls, **kwargs):
return SQLObjectResultSet(cls, by=kwargs)._one()
@classmethod
def selectFirst(cls, *args, **kwargs):
return SQLObjectResultSet(cls, *args, **kwargs)._first()
@classmethod
def selectFirstBy(cls, orderBy=None, **kwargs):
result = SQLObjectResultSet(cls, orderBy=orderBy, by=kwargs)
return result._first()
def syncUpdate(self):
self._get_store().flush()
def sync(self):
store = self._get_store()
store.flush()
store.autoreload(self)
class SQLObjectResultSet(object):
"""SQLObject-equivalent of the ResultSet class in Storm.
Storm handles joins in the Store interface, while SQLObject
does that in the result one. To offer support for prejoins,
we can't simply wrap our ResultSet instance, and instead have
to postpone the actual find until the very last moment.
"""
def __init__(self, cls, clause=None, clauseTables=None, orderBy=None,
limit=None, distinct=None, prejoins=None,
prejoinClauseTables=None, selectAlso=None,
by={}, prepared_result_set=None, slice=None):
self._cls = cls
self._clause = clause
self._clauseTables = clauseTables
self._orderBy = orderBy
self._limit = limit
self._distinct = distinct
self._prejoins = prejoins
self._prejoinClauseTables = prejoinClauseTables
self._selectAlso = selectAlso
# Parameters not mapping SQLObject:
self._by = by
self._slice = slice
self._prepared_result_set = prepared_result_set
self._finished_result_set = None
def _copy(self, **kwargs):
copy = self.__class__(self._cls, **kwargs)
for name, value in self.__dict__.iteritems():
if name[1:] not in kwargs and name != "_finished_result_set":
setattr(copy, name, value)
return copy
def _prepare_result_set(self):
store = self._cls._get_store()
args = []
if self._clause:
args.append(self._clause)
for key, value in self._by.items():
args.append(getattr(self._cls, key) == value)
tables = []
if self._clauseTables is not None:
tables.extend(self._clauseTables)
if not (self._prejoins or self._prejoinClauseTables):
find_spec = self._cls
else:
find_spec = [self._cls]
if self._prejoins:
already_prejoined = {}
last_prejoin = 0
join = self._cls
for prejoin_path in self._prejoins:
local_cls = self._cls
path = ()
for prejoin_attr in prejoin_path.split("."):
path += (prejoin_attr,)
# If we've already prejoined this column, we're done.
if path in already_prejoined:
local_cls = already_prejoined[path]
continue
# Otherwise, join the table
relation = getattr(local_cls, prejoin_attr)._relation
last_prejoin += 1
remote_cls = ClassAlias(relation.remote_cls,
'_prejoin%d' % last_prejoin)
join_expr = join_aliased_relation(
local_cls, remote_cls, relation)
join = LeftJoin(join, remote_cls, join_expr)
find_spec.append(remote_cls)
already_prejoined[path] = remote_cls
local_cls = remote_cls
if join is not self._cls:
tables.append(join)
if self._prejoinClauseTables:
property_registry = self._cls._storm_property_registry
for table in self._prejoinClauseTables:
cls = property_registry.get("<table %s>" % table).cls
find_spec.append(cls)
find_spec = tuple(find_spec)
if tables:
# If we are adding extra tables, make sure the main table
# is included.
tables.insert(0, self._cls.__storm_table__)
# Inject an AutoTables expression with a dummy true value to
# be ANDed in the WHERE clause, so that we can introduce our
# tables into the dynamic table handling of Storm without
# disrupting anything else.
args.append(AutoTables(SQL("1=1"), tables))
if self._selectAlso is not None:
if type(find_spec) is not tuple:
find_spec = (find_spec, SQL(self._selectAlso))
else:
find_spec += (SQL(self._selectAlso),)
return store.find(find_spec, *args)
def _finish_result_set(self):
if self._prepared_result_set is not None:
result = self._prepared_result_set
else:
result = self._prepare_result_set()
if self._orderBy is not None:
result.order_by(*self._cls._parse_orderBy(self._orderBy))
if self._limit is not None or self._distinct is not None:
result.config(limit=self._limit, distinct=self._distinct)
if self._slice is not None:
result = result[self._slice]
return result
@property
def _result_set(self):
if self._finished_result_set is None:
self._finished_result_set = self._finish_result_set()
return self._finished_result_set
def _without_prejoins(self, always_copy=False):
if always_copy or self._prejoins or self._prejoinClauseTables:
return self._copy(prejoins=None, prejoinClauseTables=None)
else:
return self
def _one(self):
"""Internal API for the base class."""
return detuplelize(self._result_set.one())
def _first(self):
"""Internal API for the base class."""
return detuplelize(self._result_set.first())
def __iter__(self):
for item in self._result_set:
yield detuplelize(item)
def __getitem__(self, index):
if isinstance(index, slice):
if not index.start and not index.stop:
return self
if index.start and index.start < 0 or (
index.stop and index.stop < 0):
L = list(self)
if len(L) > 100:
warnings.warn('Negative indices when slicing are slow: '
'fetched %d rows.' % (len(L),))
start, stop, step = index.indices(len(L))
assert step == 1, "slice step must be 1"
index = slice(start, stop)
return self._copy(slice=index)
else:
if index < 0:
L = list(self)
if len(L) > 100:
warnings.warn('Negative indices are slow: '
'fetched %d rows.' % (len(L),))
return detuplelize(L[index])
return detuplelize(self._result_set[index])
def __contains__(self, item):
result_set = self._without_prejoins()._result_set
return item in result_set
def __nonzero__(self):
"""Return C{True} if this result set contains any results.
@note: This method is provided for compatibility with SQL Object. For
new code, prefer L{is_empty}. It's compatible with L{ResultSet}
which doesn't have a C{__nonzero__} implementation.
"""
return not self.is_empty()
def is_empty(self):
"""Return C{True} if this result set doesn't contain any results."""
result_set = self._without_prejoins()._result_set
return result_set.is_empty()
def count(self):
result_set = self._without_prejoins()._result_set
return result_set.count()
def orderBy(self, orderBy):
return self._copy(orderBy=orderBy)
def limit(self, limit):
return self._copy(limit=limit)
def distinct(self):
return self._copy(distinct=True, orderBy=None)
def union(self, otherSelect, unionAll=False, orderBy=()):
result1 = self._without_prejoins(True)._result_set.order_by()
result2 = otherSelect._without_prejoins(True)._result_set.order_by()
result_set = result1.union(result2, all=unionAll)
return self._copy(
prepared_result_set=result_set, distinct=False, orderBy=orderBy)
def except_(self, otherSelect, exceptAll=False, orderBy=()):
result1 = self._without_prejoins(True)._result_set.order_by()
result2 = otherSelect._without_prejoins(True)._result_set.order_by()
result_set = result1.difference(result2, all=exceptAll)
return self._copy(
prepared_result_set=result_set, distinct=False, orderBy=orderBy)
def intersect(self, otherSelect, intersectAll=False, orderBy=()):
result1 = self._without_prejoins(True)._result_set.order_by()
result2 = otherSelect._without_prejoins(True)._result_set.order_by()
result_set = result1.intersection(result2, all=intersectAll)
return self._copy(
prepared_result_set=result_set, distinct=False, orderBy=orderBy)
def prejoin(self, prejoins):
return self._copy(prejoins=prejoins)
def prejoinClauseTables(self, prejoinClauseTables):
return self._copy(prejoinClauseTables=prejoinClauseTables)
def sum(self, attribute):
if isinstance(attribute, basestring):
attribute = SQL(attribute)
result_set = self._without_prejoins()._result_set
return result_set.sum(attribute)
def detuplelize(item):
"""If item is a tuple, return first element, otherwise the item itself.
The tuple syntax is used to implement prejoins, so we have to hide from
the user the fact that more than a single object are being selected at
once.
"""
if type(item) is tuple:
return item[0]
return item
def join_aliased_relation(local_cls, remote_cls, relation):
"""Build a join expression between local_cls and remote_cls.
This is equivalent to relation.get_where_for_join(), except that
the join expression is changed to be relative to the given
local_cls and remote_cls (which may be aliases).
The result is the join expression.
"""
remote_key = tuple(Column(column.name, remote_cls)
for column in relation.remote_key)
local_key = tuple(Column(column.name, local_cls)
for column in relation.local_key)
return compare_columns(local_key, remote_key)
class PropertyAdapter(object):
_kwargs = {}
def __init__(self, dbName=None, notNull=False, default=Undef,
alternateID=None, unique=_IGNORED, name=_IGNORED,
alternateMethodName=None, length=_IGNORED, immutable=None,
storm_validator=None):
if default is None and notNull:
raise RuntimeError("Can't use default=None and notNull=True")
self.dbName = dbName
self.alternateID = alternateID
self.alternateMethodName = alternateMethodName
# XXX Implement handler for:
#
# - immutable (causes setting the attribute to fail)
#
# XXX Implement tests for ignored parameters:
#
# - unique (for tablebuilder)
# - length (for tablebuilder for StringCol)
# - name (for _columns stuff)
if callable(default):
default_factory = default
default = Undef
else:
default_factory = Undef
super(PropertyAdapter, self).__init__(dbName, allow_none=not notNull,
default_factory=default_factory,
default=default,
validator=storm_validator,
**self._kwargs)
class AutoUnicodeVariable(Variable):
"""Unlike UnicodeVariable, this will try to convert str to unicode."""
__slots__ = ()
def parse_set(self, value, from_db):
if not isinstance(value, basestring):
raise TypeError("Expected basestring, found %s" % repr(type(value)))
return unicode(value)
class AutoUnicode(SimpleProperty):
variable_class = AutoUnicodeVariable
class StringCol(PropertyAdapter, AutoUnicode):
pass
class IntCol(PropertyAdapter, Int):
pass
class BoolCol(PropertyAdapter, Bool):
pass
class FloatCol(PropertyAdapter, Float):
pass
class UtcDateTimeCol(PropertyAdapter, DateTime):
_kwargs = {"tzinfo": tzutc()}
class DateCol(PropertyAdapter, Date):
pass
class IntervalCol(PropertyAdapter, TimeDelta):
pass
class ForeignKey(object):
def __init__(self, foreignKey, **kwargs):
self.foreignKey = foreignKey
self.kwargs = kwargs
class SQLMultipleJoin(ReferenceSet):
def __init__(self, otherClass=None, joinColumn=None,
intermediateTable=None, otherColumn=None, orderBy=None,
prejoins=None):
if intermediateTable:
args = ("<primary key>",
"%s.%s" % (intermediateTable, joinColumn),
"%s.%s" % (intermediateTable, otherColumn),
"%s.<primary key>" % otherClass)
else:
args = ("<primary key>", "%s.%s" % (otherClass, joinColumn))
ReferenceSet.__init__(self, *args)
self._orderBy = orderBy
self._otherClass = otherClass
self._prejoins = prejoins
def __get__(self, obj, cls=None):
if obj is None:
return self
bound_reference_set = ReferenceSet.__get__(self, obj)
target_cls = bound_reference_set._target_cls
where_clause = bound_reference_set._get_where_clause()
return SQLObjectResultSet(target_cls, where_clause,
orderBy=self._orderBy,
prejoins=self._prejoins)
def _get_bound_reference_set(self, obj):
assert obj is not None
return ReferenceSet.__get__(self, obj)
SQLRelatedJoin = SQLMultipleJoin
class SingleJoin(Reference):
def __init__(self, otherClass, joinColumn, prejoins=_IGNORED):
super(SingleJoin, self).__init__(
"<primary key>", "%s.%s" % (otherClass, joinColumn),
on_remote=True)
class CONTAINSSTRING(Like):
def __init__(self, expr, string):
string = string.replace("!", "!!") \
.replace("_", "!_") \
.replace("%", "!%")
Like.__init__(self, expr, "%"+string+"%", SQLRaw("'!'"))
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