[Jc @ s d Z d d k Z d d k l Z d d k i Z d d k l Z l Z l
Z
l Z d d k l Z
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e) f d YZ+ e i, i- Z. e i/ Z/ e i0 Z1 d Z2 d Z3 e' d Z4 d Z5 d Z6 d Z7 e6 e _6 e7 e _7 d d k l8 Z8 e. e8 _. e7 e8 _7 d S( s1 Provides the Session class and related utilities.iN( t chain( t utilt sqlt enginet log( R t
expression( t SessionExtensiont
attributest exct queryt
unitofworkR t state( t
object_mapper( t class_mapper( t _class_to_mappert _state_has_identityt
_state_mapper( t Mapper( t UOWTransaction( t identityt Sessiont SessionTransactionR c s d j o! t i d i d } n | d <| d <| d <| d <| d
j o
t } n d t f f d Y t i t d | f h } | S( s! Generate a custom-configured :class:`~sqlalchemy.orm.session.Session` class.
The returned object is a subclass of ``Session``, which, when instantiated
with no arguments, uses the keyword arguments configured here as its
constructor arguments.
It is intended that the `sessionmaker()` function be called within the
global scope of an application, and the returned class be made available
to the rest of the application as the single class used to instantiate
sessions.
e.g.::
# global scope
Session = sessionmaker(autoflush=False)
# later, in a local scope, create and use a session:
sess = Session()
Any keyword arguments sent to the constructor itself will override the
"configured" keywords::
Session = sessionmaker()
# bind an individual session to a connection
sess = Session(bind=connection)
The class also includes a special classmethod ``configure()``, which
allows additional configurational options to take place after the custom
``Session`` class has been generated. This is useful particularly for
defining the specific ``Engine`` (or engines) to which new instances of
``Session`` should be bound::
Session = sessionmaker()
Session.configure(bind=create_engine('sqlite:///foo.db'))
sess = Session()
Options:
autocommit
Defaults to ``False``. When ``True``, the ``Session`` does not keep a
persistent transaction running, and will acquire connections from the
engine on an as-needed basis, returning them immediately after their
use. Flushes will begin and commit (or possibly rollback) their own
transaction if no transaction is present. When using this mode, the
`session.begin()` method may be used to begin a transaction explicitly.
Leaving it on its default value of ``False`` means that the ``Session``
will acquire a connection and begin a transaction the first time it is
used, which it will maintain persistently until ``rollback()``,
``commit()``, or ``close()`` is called. When the transaction is released
by any of these methods, the ``Session`` is ready for the next usage,
which will again acquire and maintain a new connection/transaction.
autoflush
When ``True``, all query operations will issue a ``flush()`` call to
this ``Session`` before proceeding. This is a convenience feature so
that ``flush()`` need not be called repeatedly in order for database
queries to retrieve results. It's typical that ``autoflush`` is used in
conjunction with ``autocommit=False``. In this scenario, explicit calls
to ``flush()`` are rarely needed; you usually only need to call
``commit()`` (which flushes) to finalize changes.
bind
An optional ``Engine`` or ``Connection`` to which this ``Session``
should be bound. When specified, all SQL operations performed by this
session will execute via this connectable.
binds
An optional dictionary, which contains more granular "bind" information
than the ``bind`` parameter provides. This dictionary can map individual
``Table`` instances as well as ``Mapper`` instances to individual
``Engine`` or ``Connection`` objects. Operations which proceed relative
to a particular ``Mapper`` will consult this dictionary for the direct
``Mapper`` instance as well as the mapper's ``mapped_table`` attribute
in order to locate an connectable to use. The full resolution is
described in the ``get_bind()`` method of ``Session``. Usage looks
like::
sess = Session(binds={
SomeMappedClass: create_engine('postgres://engine1'),
somemapper: create_engine('postgres://engine2'),
some_table: create_engine('postgres://engine3'),
})
Also see the ``bind_mapper()`` and ``bind_table()`` methods.
\class_
Specify an alternate class other than ``sqlalchemy.orm.session.Session``
which should be used by the returned class. This is the only argument
that is local to the ``sessionmaker()`` function, and is not sent
directly to the constructor for ``Session``.
echo_uow
Deprecated. Use
``logging.getLogger('sqlalchemy.orm.unitofwork').setLevel(logging.DEBUG)``.
_enable_transaction_accounting
Defaults to ``True``. A legacy-only flag which when ``False``
disables *all* 0.5-style object accounting on transaction boundaries,
including auto-expiry of instances on rollback and commit, maintenance of
the "new" and "deleted" lists upon rollback, and autoflush
of pending changes upon begin(), all of which are interdependent.
expire_on_commit
Defaults to ``True``. When ``True``, all instances will be fully expired after
each ``commit()``, so that all attribute/object access subsequent to a completed
transaction will load from the most recent database state.
extension
An optional :class:`~sqlalchemy.orm.session.SessionExtension` instance, or
a list of such instances, which
will receive pre- and post- commit and flush events, as well as a
post-rollback event. User- defined code may be placed within these
hooks using a user-defined subclass of ``SessionExtension``.
query_cls
Class which should be used to create new Query objects, as returned
by the ``query()`` method. Defaults to :class:`~sqlalchemy.orm.query.Query`.
twophase
When ``True``, all transactions will be started using
:mod:~sqlalchemy.engine_TwoPhaseTransaction. During a ``commit()``, after
``flush()`` has been issued for all attached databases, the
``prepare()`` method on each database's ``TwoPhaseTransaction`` will be
called. This allows each database to roll back the entire transaction,
before each transaction is committed.
weak_identity_map
When set to the default value of ``True``, a weak-referencing map is
used; instances which are not externally referenced will be garbage
collected immediately. For dereferenced instances which have pending
changes present, the attribute management system will create a temporary
strong-reference to the object which lasts until the changes are flushed
to the database, at which point it's again dereferenced. Alternatively,
when using the value ``False``, the identity map uses a regular Python
dictionary to store instances. The session will maintain all instances
present until they are removed using expunge(), clear(), or purge().
t
transactionals` The 'transactional' argument to sessionmaker() is deprecated; use autocommit=True|False instead.t bindt autoflusht
autocommitt expire_on_committ Sessc s5 e Z f d Z f d Z e e Z RS( c s? x" D] } | i | | q Wt | i | d S( N( t
setdefaultt supert __init__( t selft local_kwargst k( R t kwargs( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s c s i | d S( s (Re)configure the arguments for this sessionmaker.
e.g.::
Session = sessionmaker()
Session.configure(bind=create_engine('sqlite://'))
N( t update( R t
new_kwargs( R" ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt configure s ( t __name__t
__module__R R% t classmethod( ( R R" ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s
R N( R t warn_deprecatedt popt NoneR t objectt typet __new__( R t class_R R R R" t s( ( R R" s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt sessionmaker s
c B s e Z d Z d e d Z e d Z d Z d d Z e d Z
d Z e d Z d d Z
d
Z d Z d Z d
Z d Z d Z d Z d Z d Z d Z d Z d Z d Z RS( s A Session-level transaction.
This corresponds to one or more :class:`~sqlalchemy.engine.Transaction`
instances behind the scenes, with one ``Transaction`` per ``Engine`` in
use.
Direct usage of ``SessionTransaction`` is not necessary as of SQLAlchemy
0.4; use the ``begin()`` and ``commit()`` methods on ``Session`` itself.
The ``SessionTransaction`` object is **not** thread-safe.
.. index::
single: thread safety; SessionTransaction
c C sw | | _ h | _ | | _ | | _ t | _ t | _ | o | o t i d n | i i
o | i n d S( NsO Can't start a SAVEPOINT transaction when no existing transaction is in progress( t sessiont _connectionst _parentt nestedt Truet _activet Falset _preparedt sa_exct InvalidRequestErrort _enable_transaction_accountingt _take_snapshot( R R2 t parentR5 ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s
c C s | i d j o | i S( N( R2 R+ R7 ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt is_active s c C s+ | i | i p t i d n d S( Nso The transaction is inactive due to a rollback in a subtransaction. Issue rollback() to cancel the transaction.( t _assert_is_openR7 R: R; ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt _assert_is_active s
s The transaction is closedc C s' | i d j o t i | n d S( N( R2 R+ R: R; ( R t error_msg( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR@ s c C s | i p | i S( N( R5 R4 ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt _is_transaction_boundary s c K s, | i | i i | | } | i | S( N( RA R2 t get_bindt _connection_for_bind( R t bindkeyR" R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt
connection s
c C s | i t | i | d | S( NR5 ( RA R R2 ( R R5 ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt _begin s
c C sZ | i | j o | f S| i d j o t i d | n | f | i i | Sd S( Ns4 Transaction %s is not on the active transaction list( R4 R+ R: R; t _iterate_parents( R t upto( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyRI s c C sm | i p# | i i | _ | i i | _ d S| i i p | i i n t i | _ t i | _ d S( N( RC R4 t _newt _deletedR2 t _flushingt flusht weakreft WeakKeyDictionary( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR= s
c
C s | i p t x6 t | i i | i i D] } | i i | q0 W| i i p t x6 t | i i | i i D] } | i i | q~ Wx3 | i i i
D] } t | d d | i i q Wd S( Nt
instance_dict(
RC t AssertionErrort setRL t unionR2 t _update_implRK t _expunge_statet identity_mapt
all_statest
_expire_stateR+ ( R R0 ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt _restore_snapshot" s c C sg | i p t | i oG | i i o: x7 | i i i D] } t | d d | i i q< Wn d S( NRQ ( RC RR R5 R2 R RW RX RY R+ ( R R0 ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt _remove_snapshot0 s
c C sV | i | | i j o | i | d S| i o% | i i | } | i p | SnP t | t i o0 | } | i | i j o t i d q n
| i
} | i i o | i d j o | i } n' | i o | i } n
| i } | | | | j f | i | <| i | i Z, e i d8 e* Z- d? Z. d@ Z/ e dA Z0 e dW dB Z1 e dC Z2 e dD Z3 dE Z4 dF Z5 dG Z6 dH Z7 dI Z8 dJ Z9 dK Z: dL Z; dM Z< dW dN Z= dW dO Z> e e dP Z? e@ dQ ZA e@ dR ZB e@ dS ZC e@ dT ZD e@ dU ZE RS(X s
Manages persistence operations for ORM-mapped objects.
The Session is the front end to SQLAlchemy's **Unit of Work**
implementation. The concept behind Unit of Work is to track modifications
to a field of objects, and then be able to flush those changes to the
database in a single operation.
SQLAlchemy's unit of work includes these functions:
* The ability to track in-memory changes on scalar- and collection-based
object attributes, such that database persistence operations can be
assembled based on those changes.
* The ability to organize individual SQL queries and population of newly
generated primary and foreign key-holding attributes during a persist
operation such that referential integrity is maintained at all times.
* The ability to maintain insert ordering against the order in which new
instances were added to the session.
* An Identity Map, which is a dictionary keying instances to their unique
primary key identity. This ensures that only one copy of a particular
entity is ever present within the session, even if repeated load
operations for the same entity occur. This allows many parts of an
application to get a handle to a particular object without any chance of
modifications going to two different places.
When dealing with instances of mapped classes, an instance may be
*attached* to a particular Session, else it is *unattached* . An instance
also may or may not correspond to an actual row in the database. These
conditions break up into four distinct states:
* *Transient* - an instance that's not in a session, and is not saved to
the database; i.e. it has no database identity. The only relationship
such an object has to the ORM is that its class has a ``mapper()``
associated with it.
* *Pending* - when you ``add()`` a transient instance, it becomes
pending. It still wasn't actually flushed to the database yet, but it
will be when the next flush occurs.
* *Persistent* - An instance which is present in the session and has a
record in the database. You get persistent instances by either flushing
so that the pending instances become persistent, or by querying the
database for existing instances (or moving persistent instances from
other sessions into your local session).
* *Detached* - an instance which has a record in the database, but is not
in any session. Theres nothing wrong with this, and you can use objects
normally when they're detached, **except** they will not be able to
issue any SQL in order to load collections or attributes which are not
yet loaded, or were marked as "expired".
The session methods which control instance state include ``add()``,
``delete()``, ``merge()``, and ``expunge()``.
The Session object is generally **not** threadsafe. A session which is
set to ``autocommit`` and is only read from may be used by concurrent
threads if it's acceptable that some object instances may be loaded twice.
The typical pattern to managing Sessions in a multi-threaded environment
is either to use mutexes to limit concurrent access to one thread at a
time, or more commonly to establish a unique session for every thread,
using a threadlocal variable. SQLAlchemy provides a thread-managed
Session adapter, provided by the :func:`~sqlalchemy.orm.scoped_session`
function.
t __contains__t __iter__t addt add_allRb Ra t clearRs Rk RG t deletet executet expiret
expire_allt expunget expunge_allRN RD t is_modifiedt mergeR t refreshRm t savet save_or_updatet scalarR# c C s | d j o! t i d t i t | n | o t i | _ n
t i | _ | i | _
h | _ h | _ | | _
h | _ t | _ d | _ t | | _ | | _ | | _ | | _ | | _ | | _ t i |
p g | _ | | _ h | _ | d j o x | i D]q \ } }
t | t o t | i! } n |
| i | Close this Session.
This clears all items and ends any transaction in progress.
If this session were created with ``autocommit=False``, a new
transaction is immediately begun. Note that this new transaction does
not use any connection resources until they are first needed.
N( R Rf R+ RI Rs ( R Rf ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyRs s
c C s% x t i D] } | i q
Wd S( s Close *all* sessions in memory.N( R Rl Rs ( t clst sess( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt close_all s
c C sV x. | i i t | i D] } | i q W| i | _ h | _ h | _ d S( s Remove all object instances from this ``Session``.
This is equivalent to calling ``expunge(obj)`` on all objects in this
``Session``.
N( RW RX t listRK t detachR RL ( R R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s s Use session.expunge_all()c C sU t | t o t | } n | | i | i
c O s | i | | | S( s@ Return a new ``Query`` object corresponding to this ``Session``.( R ( R t entitiesR" ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR | s c C s' | i o | i o | i n d S( N( R RM RN ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt
_autoflush s c C s4 x- | i D] \ } } | i | | i q
Wd S( N( t itemst
commit_allRW ( R t statesR t dict_( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt _finalize_loaded s
c C s y t i | } Wn% t i j
o t i | n X| i | | i t | i | i d | d | d j o t i d t
i | n d S( sy Refresh the attributes on the given instance.
A query will be issued to the database and all attributes will be
refreshed with their current database value.
Lazy-loaded relational attributes will remain lazily loaded, so that
the instance-wide refresh operation will be followed immediately by
the lazy load of that attribute.
Eagerly-loaded relational attributes will eagerly load within the
single refresh operation.
The ``attribute_names`` argument is an iterable collection of
attribute names indicating a subset of attributes to be refreshed.
t
refresh_statet only_load_propss Could not refresh instance '%s'N( R t instance_stateR t NO_STATEt UnmappedInstanceErrort _validate_persistentR t _object_mappert _gett keyR+ R: R; t
mapperutilt instance_str( R t instancet attribute_namesR ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s
c C s4 x- | i i D] } t | d d | i q Wd S( s5 Expires all persistent instances within this Session.RQ N( RW RX RY R+ ( R R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s c C s y t i | } Wn% t i j
o t i | n X| i | | o t | d | d | i n\ t t d | } t | d d | i x- | D]% \ } } } t | d d | i q Wd S( s Expire the attributes on an instance.
Marks the attributes of an instance as out of date. When an expired
attribute is next accessed, query will be issued to the database and
the attributes will be refreshed with their current database value.
``expire()`` is a lazy variant of ``refresh()``.
The ``attribute_names`` argument is an iterable collection
of attribute names indicating a subset of attributes to be
expired.
R RQ s refresh-expireN( R R R R R R RY RW R t _cascade_state_iteratorR+ ( R R R R t cascadedt mt o( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s
c C s
| i i S( s Remove unreferenced instances cached in the identity map.
Note that this method is only meaningful if "weak_identity_map" is set
to False. The default weak identity map is self-pruning.
Removes any object in this Session's identity map that is not
referenced in user code, modified, new or scheduled for deletion.
Returns the number of objects pruned.
( RW t prune( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s c C s y t i | } Wn% t i j
o t i | n X| i | i j o t i d t i
| n xC | d d f g t t
d | D] \ } } } | i | q Wd S( s Remove the `instance` from this ``Session``.
This will free all internal references to the instance. Cascading
will be applied according to the *expunge* cascade rule.
s* Instance %s is not present in this SessionR N( R R R R R t
session_idR R: R; R t state_strR+ R R RV ( R R R R0 R R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s & c C sv | | i j o | i i | | i nE | i i | o1 | i i | | i i | d | i n d S( N( RK R* R RW t contains_statet discardRL R+ ( R R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyRV s c C s t | } | i } | d j o | i | } | i d j o
| | _ n. | i | j o | i i | | | _ n | i i | | i | i | i n | | i
j o< | i o | i o t
| i i
| Q s ( t _cascade_unknown_state_iteratorR ( R R R ( ( R s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR P s c C s y t i | } Wn% t i j
o t i | n X| i d j o t i d t i
| n | | i j o d S| i | t
t d | } | i | i | <| i i | x$ | D] \ } } } | i | q Wd S( sf Mark an instance as deleted.
The database delete operation occurs upon ``flush()``.
s Instance '%s' is not persistedNR ( R R R R R R R+ R: R; R R RL t _attachR R R RW R t _delete_impl( R R R t cascade_statesR R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR T s"
c C sP h } | i | i } z& t | _ | i | d | d | SWd | | _ Xd S( s Copy the state an instance onto the persistent instance with the same identifier.
If there is no persistent instance currently associated with the
session, it will be loaded. Return the persistent instance. If the
given instance is unsaved, save a copy of and return it as a newly
persistent instance. The given instance does not become associated
with the session.
This operation cascades to associated instances if the association is
mapped with ``cascade="merge"``.
t dont_loadt
_recursiveN( R R R8 t _merge( R R R R R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR v s
c C s t | } | | j o | | St } t i | } | i } | d j o- | o t i d n | i | } n d } | o | | i j o | i | } q-| o[ | i
o t i d n | i i } t i | } | | _ | i
| t } q-| i | i i | d } n | d j o5 | i i } t i | } t } | i | n | | | Object '%s' is already attached to session '%s' (this is '%s')( R RW R R: R; R R R R Rc t after_attachR ( R R Rg ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s
c C sH y t i | } Wn% t i j
o t i | n X| i | S( s Return True if the instance is associated with this session.
The instance may be pending or persistent within the Session for a
result of True.
( R R R R R t _contains_state( R R R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR} s
c C s& t t | i i | i i S( sE Iterate over all pending or persistent instances within this Session.( t iterR RK Rl RW ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR~ s c C s | | i j p | i i | S( N( RK RW R ( R R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR $ s c C s` | o t i d n | i o t i d n z t | _ | i | Wd t | _ Xd S( sA Flush all the object changes to the database.
Writes out all pending object creations, deletions and modifications
to the database as INSERTs, DELETEs, UPDATEs, etc. Operations are
automatically ordered by the Session's unit of work dependency
solver..
Database operations will be issued in the current transactional
context and do not affect the state of the transaction. You may
flush() as often as you like within a transaction to move changes from
Python to the database's transaction buffer.
For ``autocommit`` Sessions with no active manual transaction, flush()
will create a transaction on the fly that surrounds the entire set of
operations int the flush.
objects
Optional; a list or tuple collection. Restricts the flush operation
to only these objects, rather than all pending changes.
Deprecated - this flag prevents the session from properly maintaining
accounting among inter-object relations and can cause invalid results.
s The 'objects' argument to session.flush() is deprecated; Please do not add objects to the session which should not yet be persisted.s Session is already flushingN( R R) RM R: R; R6 t _flushR8 ( R t objects( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyRN ' s
c C s | i i o | i o | i o d S| i } | o+ | i o | i o | i i i d St | } | i o4 x$ | i D] } | i | | | q W| i } n t
| i } t
| i } t
| i | } | of t
} x` | D]N } y t i
| } Wn% t i j
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}
| o% | i | i | i | } n | i | i | } x | D] } t | i | } | o t | o d i g }
t d t | i D D] \ } } |
d | i | f q ~
} t i d t i | | f n | i | d | |
i | qW| o | i | i |
} n | i |
} x! | D] } | i | d t qWt! | i" d j o d S| i# d t | _$ } y< | i% x! | i D] } | i& | | q W| i' Wn | i( n X| i) x! | i D] } | i* | | qpWd S( Ns , nor c s s x | ] } | i Vq Wd S( N( t delete_orphans( t .0R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pys s s9 any parent '%s' instance via that classes' '%s' attributesT Instance %s is an unsaved, pending instance and is an orphan (is not attached to %s)t isdeletei R (+ RW t check_modifiedRL RK t
_dirty_statest _modifiedR R Rc t before_flushRS t
differenceR R R R R R R+ RT t intersectionR t
_is_orphanR R R t iterate_to_rootR& t
FlushErrorR R t register_objectR6 R t tasksRb Rf R t after_flushRk Rm t finalize_flush_changest after_flush_postexec( R R t dirtyt
flush_contextRg t deletedt newt objsetR R t processedt proct is_orphant _[1]R R t pathRf ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR N s
% L
c
C s y t i | } Wn% t i j
o t i | n X| i } x | i i D]s } | o t | i d p t | i d o qQ n | i i | | d | \ } } } | p | o t
SqQ Wt S( s\ Return True if instance has modified attributes.
This method retrieves a history instance for each instrumented
attribute on the instance and performs a comparison of the current
value to its previously committed value. Note that instances present
in the 'dirty' collection may result in a value of ``False`` when
tested with this method.
`include_collections` indicates if multivalued collections should be
included in the operation. Setting this to False is a way to detect
only local-column based properties (i.e. scalar columns or many-to-one
foreign keys) that would result in an UPDATE for this instance upon
flush.
The `passive` flag indicates if unloaded attributes and collections
should not be loaded in the course of performing this test.
t get_collectiont get_historyt passive( R R R R R R t managert hasattrt implR$ R6 R8 (
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| i i S( s/ True if this Session has an active transaction.( Rf R? ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR? s c C s
| i i S( s The set of all persistent states considered dirty.
This method returns all states that were modified including
those that were possibly deleted.
( RW R ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s c C sE t i g } | i D]' } | | i j o | | i q q ~ S( s
The set of all persistent instances considered dirty.
Instances are considered dirty when they were modified but not
deleted.
Note that this 'dirty' calculation is 'optimistic'; most
attribute-setting or collection modification operations will
mark an instance as 'dirty' and place it in this set, even if
there is no net change to the attribute's value. At flush
time, the value of each attribute is compared to its
previously saved value, and if there's no net change, no SQL
operation will occur (this is a more expensive operation so
it's only done at flush time).
To check if an instance has actionable net changes to its
attributes, use the is_modified() method.
( R t IdentitySetR RL R ( R R! R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s
c C s t i | i i S( sD The set of all instances marked as 'deleted' within this ``Session``( R R- RL Rl ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s c C s t i | i i S( sA The set of all instances marked as 'new' within this ``Session``.( R R- RK Rl ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s ( s __contains__s __iter__s adds add_alls begins begin_nesteds clears closes commits
connections deletes executes expires
expire_alls expunges expunge_alls flushs get_binds is_modifieds merges querys refreshs rollbacks saves save_or_updates scalars updateN(F R& R' R{ t public_methodsR+ R6 R8 R t QueryR Rb Ra Rm Rk Ri RG R R R Rs R( R R R t
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| } n t i | | S( Ns# Instance '%s' is already persistent( R R t AttributeErrorR R R R+ R: R; R R t manager_of_classt __class__t setup_instance( R R R R& ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR s
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o t i | n X| S( N( R R R R R ( R R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR 0 s
c C s t t i | S( s: Return the ``Session`` to which instance belongs, or None.( t _state_sessionR R ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR 8 s c C s7 | i o) y t | i SWq3 t j
o q3 Xn d S( N( R R t KeyErrorR+ ( R ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyR7 = s
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exceptionsR: t
sqlalchemyR R R R t sqlalchemy.sqlR R t sqlalchemy.ormR R R R R
R R t sqlalchemy.orm.utilR R R
R R R R t sqlalchemy.orm.mapperR t sqlalchemy.orm.unitofworkR R t __all__R+ R6 R8 R1 R, R R t
InstanceStatet expire_attributesRY t UOWEventHandlert WeakValueDictionaryR R R R R R R7 R ( ( ( s: /usr/lib/python2.6/site-packages/sqlalchemy/orm/session.pyt sF "4 E