root/galaxy-central/eggs/SQLAlchemy-0.5.6_dev_r6498-py2.6.egg/sqlalchemy/orm/exc.py

リビジョン 3, 3.0 KB (コミッタ: kohda, 14 年 前)

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1# exc.py - ORM exceptions
2# Copyright (C) the SQLAlchemy authors and contributors
3#
4# This module is part of SQLAlchemy and is released under
5# the MIT License: http://www.opensource.org/licenses/mit-license.php
6
7"""SQLAlchemy ORM exceptions."""
8
9import sqlalchemy as sa
10
11
12NO_STATE = (AttributeError, KeyError)
13"""Exception types that may be raised by instrumentation implementations."""
14
15class ConcurrentModificationError(sa.exc.SQLAlchemyError):
16    """Rows have been modified outside of the unit of work."""
17
18
19class FlushError(sa.exc.SQLAlchemyError):
20    """A invalid condition was detected during flush()."""
21
22
23class UnmappedError(sa.exc.InvalidRequestError):
24    """TODO"""
25
26
27class UnmappedInstanceError(UnmappedError):
28    """An mapping operation was requested for an unknown instance."""
29
30    def __init__(self, obj, msg=None):
31        if not msg:
32            try:
33                mapper = sa.orm.class_mapper(type(obj))
34                name = _safe_cls_name(type(obj))
35                msg = ("Class %r is mapped, but this instance lacks "
36                       "instrumentation.  Possible causes: instance created "
37                       "before sqlalchemy.orm.mapper(%s) was called, or "
38                       "instance was pickled/depickled without instrumentation"
39                       "information." % (name, name))
40            except UnmappedClassError:
41                msg = _default_unmapped(type(obj))
42                if isinstance(obj, type):
43                    msg += (
44                        '; was a class (%s) supplied where an instance was '
45                        'required?' % _safe_cls_name(obj))
46        UnmappedError.__init__(self, msg)
47
48
49class UnmappedClassError(UnmappedError):
50    """An mapping operation was requested for an unknown class."""
51
52    def __init__(self, cls, msg=None):
53        if not msg:
54            msg = _default_unmapped(cls)
55        UnmappedError.__init__(self, msg)
56
57
58class ObjectDeletedError(sa.exc.InvalidRequestError):
59    """An refresh() operation failed to re-retrieve an object's row."""
60
61
62class UnmappedColumnError(sa.exc.InvalidRequestError):
63    """Mapping operation was requested on an unknown column."""
64
65
66class NoResultFound(sa.exc.InvalidRequestError):
67    """A database result was required but none was found."""
68
69
70class MultipleResultsFound(sa.exc.InvalidRequestError):
71    """A single database result was required but more than one were found."""
72
73
74# Legacy compat until 0.6.
75sa.exc.ConcurrentModificationError = ConcurrentModificationError
76sa.exc.FlushError = FlushError
77sa.exc.UnmappedColumnError
78
79def _safe_cls_name(cls):
80    try:
81        cls_name = '.'.join((cls.__module__, cls.__name__))
82    except AttributeError:
83        cls_name = getattr(cls, '__name__', None)
84        if cls_name is None:
85            cls_name = repr(cls)
86    return cls_name
87
88def _default_unmapped(cls):
89    try:
90        mappers = sa.orm.attributes.manager_of_class(cls).mappers
91    except NO_STATE:
92        mappers = {}
93    except TypeError:
94        mappers = {}
95    name = _safe_cls_name(cls)
96
97    if not mappers:
98        return "Class '%s' is not mapped" % name
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