1108 lines
41 KiB
Python
1108 lines
41 KiB
Python
# orm/persistence.py
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# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""private module containing functions used to emit INSERT, UPDATE
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and DELETE statements on behalf of a :class:`.Mapper` and its descending
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mappers.
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The functions here are called only by the unit of work functions
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in unitofwork.py.
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"""
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import operator
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from itertools import groupby
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from .. import sql, util, exc as sa_exc, schema
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from . import attributes, sync, exc as orm_exc, evaluator
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from .base import _state_mapper, state_str, _attr_as_key
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from ..sql import expression
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from . import loading
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def save_obj(base_mapper, states, uowtransaction, single=False):
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"""Issue ``INSERT`` and/or ``UPDATE`` statements for a list
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of objects.
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This is called within the context of a UOWTransaction during a
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flush operation, given a list of states to be flushed. The
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base mapper in an inheritance hierarchy handles the inserts/
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updates for all descendant mappers.
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"""
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# if batch=false, call _save_obj separately for each object
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if not single and not base_mapper.batch:
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for state in _sort_states(states):
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save_obj(base_mapper, [state], uowtransaction, single=True)
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return
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states_to_insert, states_to_update = _organize_states_for_save(
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base_mapper,
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states,
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uowtransaction)
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cached_connections = _cached_connection_dict(base_mapper)
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for table, mapper in base_mapper._sorted_tables.items():
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insert = _collect_insert_commands(base_mapper, uowtransaction,
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table, states_to_insert)
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update = _collect_update_commands(base_mapper, uowtransaction,
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table, states_to_update)
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if update:
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_emit_update_statements(base_mapper, uowtransaction,
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cached_connections,
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mapper, table, update)
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if insert:
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_emit_insert_statements(base_mapper, uowtransaction,
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cached_connections,
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mapper, table, insert)
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_finalize_insert_update_commands(base_mapper, uowtransaction,
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states_to_insert, states_to_update)
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def post_update(base_mapper, states, uowtransaction, post_update_cols):
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"""Issue UPDATE statements on behalf of a relationship() which
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specifies post_update.
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"""
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cached_connections = _cached_connection_dict(base_mapper)
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states_to_update = _organize_states_for_post_update(
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base_mapper,
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states, uowtransaction)
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for table, mapper in base_mapper._sorted_tables.items():
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update = _collect_post_update_commands(base_mapper, uowtransaction,
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table, states_to_update,
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post_update_cols)
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if update:
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_emit_post_update_statements(base_mapper, uowtransaction,
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cached_connections,
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mapper, table, update)
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def delete_obj(base_mapper, states, uowtransaction):
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"""Issue ``DELETE`` statements for a list of objects.
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This is called within the context of a UOWTransaction during a
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flush operation.
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"""
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cached_connections = _cached_connection_dict(base_mapper)
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states_to_delete = _organize_states_for_delete(
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base_mapper,
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states,
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uowtransaction)
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table_to_mapper = base_mapper._sorted_tables
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for table in reversed(list(table_to_mapper.keys())):
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delete = _collect_delete_commands(base_mapper, uowtransaction,
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table, states_to_delete)
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mapper = table_to_mapper[table]
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_emit_delete_statements(base_mapper, uowtransaction,
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cached_connections, mapper, table, delete)
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for state, state_dict, mapper, has_identity, connection \
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in states_to_delete:
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mapper.dispatch.after_delete(mapper, connection, state)
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def _organize_states_for_save(base_mapper, states, uowtransaction):
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"""Make an initial pass across a set of states for INSERT or
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UPDATE.
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This includes splitting out into distinct lists for
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each, calling before_insert/before_update, obtaining
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key information for each state including its dictionary,
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mapper, the connection to use for the execution per state,
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and the identity flag.
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"""
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states_to_insert = []
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states_to_update = []
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for state, dict_, mapper, connection in _connections_for_states(
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base_mapper, uowtransaction,
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states):
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has_identity = bool(state.key)
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instance_key = state.key or mapper._identity_key_from_state(state)
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row_switch = None
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# call before_XXX extensions
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if not has_identity:
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mapper.dispatch.before_insert(mapper, connection, state)
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else:
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mapper.dispatch.before_update(mapper, connection, state)
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if mapper._validate_polymorphic_identity:
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mapper._validate_polymorphic_identity(mapper, state, dict_)
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# detect if we have a "pending" instance (i.e. has
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# no instance_key attached to it), and another instance
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# with the same identity key already exists as persistent.
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# convert to an UPDATE if so.
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if not has_identity and \
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instance_key in uowtransaction.session.identity_map:
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instance = \
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uowtransaction.session.identity_map[instance_key]
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existing = attributes.instance_state(instance)
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if not uowtransaction.is_deleted(existing):
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raise orm_exc.FlushError(
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"New instance %s with identity key %s conflicts "
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"with persistent instance %s" %
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(state_str(state), instance_key,
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state_str(existing)))
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base_mapper._log_debug(
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"detected row switch for identity %s. "
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"will update %s, remove %s from "
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"transaction", instance_key,
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state_str(state), state_str(existing))
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# remove the "delete" flag from the existing element
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uowtransaction.remove_state_actions(existing)
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row_switch = existing
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if not has_identity and not row_switch:
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states_to_insert.append(
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(state, dict_, mapper, connection,
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has_identity, instance_key, row_switch)
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)
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else:
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states_to_update.append(
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(state, dict_, mapper, connection,
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has_identity, instance_key, row_switch)
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)
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return states_to_insert, states_to_update
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def _organize_states_for_post_update(base_mapper, states,
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uowtransaction):
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"""Make an initial pass across a set of states for UPDATE
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corresponding to post_update.
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This includes obtaining key information for each state
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including its dictionary, mapper, the connection to use for
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the execution per state.
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"""
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return list(_connections_for_states(base_mapper, uowtransaction,
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states))
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def _organize_states_for_delete(base_mapper, states, uowtransaction):
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"""Make an initial pass across a set of states for DELETE.
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This includes calling out before_delete and obtaining
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key information for each state including its dictionary,
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mapper, the connection to use for the execution per state.
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"""
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states_to_delete = []
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for state, dict_, mapper, connection in _connections_for_states(
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base_mapper, uowtransaction,
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states):
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mapper.dispatch.before_delete(mapper, connection, state)
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states_to_delete.append((state, dict_, mapper,
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bool(state.key), connection))
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return states_to_delete
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def _collect_insert_commands(base_mapper, uowtransaction, table,
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states_to_insert):
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"""Identify sets of values to use in INSERT statements for a
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list of states.
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"""
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insert = []
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for state, state_dict, mapper, connection, has_identity, \
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instance_key, row_switch in states_to_insert:
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if table not in mapper._pks_by_table:
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continue
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pks = mapper._pks_by_table[table]
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params = {}
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value_params = {}
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has_all_pks = True
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has_all_defaults = True
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for col in mapper._cols_by_table[table]:
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if col is mapper.version_id_col and \
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mapper.version_id_generator is not False:
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val = mapper.version_id_generator(None)
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params[col.key] = val
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else:
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# pull straight from the dict for
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# pending objects
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prop = mapper._columntoproperty[col]
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value = state_dict.get(prop.key, None)
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if value is None:
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if col in pks:
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has_all_pks = False
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elif col.default is None and \
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col.server_default is None:
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params[col.key] = value
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elif col.server_default is not None and \
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mapper.base_mapper.eager_defaults:
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has_all_defaults = False
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elif isinstance(value, sql.ClauseElement):
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value_params[col] = value
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else:
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params[col.key] = value
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insert.append((state, state_dict, params, mapper,
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connection, value_params, has_all_pks,
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has_all_defaults))
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return insert
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def _collect_update_commands(base_mapper, uowtransaction,
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table, states_to_update):
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"""Identify sets of values to use in UPDATE statements for a
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list of states.
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This function works intricately with the history system
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to determine exactly what values should be updated
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as well as how the row should be matched within an UPDATE
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statement. Includes some tricky scenarios where the primary
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key of an object might have been changed.
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"""
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update = []
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for state, state_dict, mapper, connection, has_identity, \
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instance_key, row_switch in states_to_update:
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if table not in mapper._pks_by_table:
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continue
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pks = mapper._pks_by_table[table]
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params = {}
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value_params = {}
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hasdata = hasnull = False
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for col in mapper._cols_by_table[table]:
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if col is mapper.version_id_col:
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params[col._label] = \
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mapper._get_committed_state_attr_by_column(
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row_switch or state,
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row_switch and row_switch.dict
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or state_dict,
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col)
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prop = mapper._columntoproperty[col]
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history = attributes.get_state_history(
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state, prop.key,
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attributes.PASSIVE_NO_INITIALIZE
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)
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if history.added:
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params[col.key] = history.added[0]
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hasdata = True
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else:
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if mapper.version_id_generator is not False:
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val = mapper.version_id_generator(params[col._label])
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params[col.key] = val
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# HACK: check for history, in case the
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# history is only
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# in a different table than the one
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# where the version_id_col is.
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for prop in mapper._columntoproperty.values():
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history = attributes.get_state_history(
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state, prop.key,
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attributes.PASSIVE_NO_INITIALIZE)
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if history.added:
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hasdata = True
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else:
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prop = mapper._columntoproperty[col]
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history = attributes.get_state_history(
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state, prop.key,
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attributes.PASSIVE_NO_INITIALIZE)
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if history.added:
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if isinstance(history.added[0],
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sql.ClauseElement):
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value_params[col] = history.added[0]
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else:
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value = history.added[0]
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params[col.key] = value
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if col in pks:
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if history.deleted and \
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not row_switch:
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# if passive_updates and sync detected
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# this was a pk->pk sync, use the new
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# value to locate the row, since the
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# DB would already have set this
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if ("pk_cascaded", state, col) in \
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uowtransaction.attributes:
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value = history.added[0]
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params[col._label] = value
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else:
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# use the old value to
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# locate the row
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value = history.deleted[0]
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params[col._label] = value
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hasdata = True
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else:
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# row switch logic can reach us here
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# remove the pk from the update params
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# so the update doesn't
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# attempt to include the pk in the
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# update statement
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del params[col.key]
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value = history.added[0]
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params[col._label] = value
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if value is None:
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hasnull = True
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else:
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hasdata = True
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elif col in pks:
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value = state.manager[prop.key].impl.get(
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state, state_dict)
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if value is None:
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hasnull = True
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params[col._label] = value
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if hasdata:
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if hasnull:
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raise orm_exc.FlushError(
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"Can't update table "
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"using NULL for primary "
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"key value")
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update.append((state, state_dict, params, mapper,
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connection, value_params))
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return update
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def _collect_post_update_commands(base_mapper, uowtransaction, table,
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states_to_update, post_update_cols):
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"""Identify sets of values to use in UPDATE statements for a
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list of states within a post_update operation.
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"""
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update = []
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for state, state_dict, mapper, connection in states_to_update:
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if table not in mapper._pks_by_table:
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continue
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pks = mapper._pks_by_table[table]
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params = {}
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hasdata = False
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for col in mapper._cols_by_table[table]:
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if col in pks:
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params[col._label] = \
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mapper._get_state_attr_by_column(
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state,
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state_dict, col)
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elif col in post_update_cols:
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prop = mapper._columntoproperty[col]
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history = attributes.get_state_history(
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state, prop.key,
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attributes.PASSIVE_NO_INITIALIZE)
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if history.added:
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value = history.added[0]
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params[col.key] = value
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hasdata = True
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if hasdata:
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update.append((state, state_dict, params, mapper,
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connection))
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return update
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def _collect_delete_commands(base_mapper, uowtransaction, table,
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states_to_delete):
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"""Identify values to use in DELETE statements for a list of
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states to be deleted."""
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delete = util.defaultdict(list)
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for state, state_dict, mapper, has_identity, connection \
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in states_to_delete:
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if not has_identity or table not in mapper._pks_by_table:
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continue
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params = {}
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delete[connection].append(params)
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for col in mapper._pks_by_table[table]:
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params[col.key] = \
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value = \
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mapper._get_committed_state_attr_by_column(
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state, state_dict, col)
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if value is None:
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raise orm_exc.FlushError(
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"Can't delete from table "
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"using NULL for primary "
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"key value")
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if mapper.version_id_col is not None and \
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table.c.contains_column(mapper.version_id_col):
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params[mapper.version_id_col.key] = \
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mapper._get_committed_state_attr_by_column(
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state, state_dict,
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mapper.version_id_col)
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return delete
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def _emit_update_statements(base_mapper, uowtransaction,
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cached_connections, mapper, table, update):
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"""Emit UPDATE statements corresponding to value lists collected
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by _collect_update_commands()."""
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needs_version_id = mapper.version_id_col is not None and \
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table.c.contains_column(mapper.version_id_col)
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def update_stmt():
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clause = sql.and_()
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for col in mapper._pks_by_table[table]:
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clause.clauses.append(col == sql.bindparam(col._label,
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type_=col.type))
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if needs_version_id:
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clause.clauses.append(mapper.version_id_col ==\
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sql.bindparam(mapper.version_id_col._label,
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type_=mapper.version_id_col.type))
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stmt = table.update(clause)
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if mapper.base_mapper.eager_defaults:
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stmt = stmt.return_defaults()
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elif mapper.version_id_col is not None:
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stmt = stmt.return_defaults(mapper.version_id_col)
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return stmt
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statement = base_mapper._memo(('update', table), update_stmt)
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rows = 0
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for state, state_dict, params, mapper, \
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connection, value_params in update:
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if value_params:
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c = connection.execute(
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statement.values(value_params),
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params)
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else:
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c = cached_connections[connection].\
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execute(statement, params)
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_postfetch(
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mapper,
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uowtransaction,
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table,
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state,
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state_dict,
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c,
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c.context.compiled_parameters[0],
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value_params)
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rows += c.rowcount
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|
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if connection.dialect.supports_sane_rowcount:
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if rows != len(update):
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raise orm_exc.StaleDataError(
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"UPDATE statement on table '%s' expected to "
|
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"update %d row(s); %d were matched." %
|
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(table.description, len(update), rows))
|
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|
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elif needs_version_id:
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util.warn("Dialect %s does not support updated rowcount "
|
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"- versioning cannot be verified." %
|
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c.dialect.dialect_description,
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stacklevel=12)
|
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|
|
|
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def _emit_insert_statements(base_mapper, uowtransaction,
|
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cached_connections, mapper, table, insert):
|
|
"""Emit INSERT statements corresponding to value lists collected
|
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by _collect_insert_commands()."""
|
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|
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statement = base_mapper._memo(('insert', table), table.insert)
|
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|
|
for (connection, pkeys, hasvalue, has_all_pks, has_all_defaults), \
|
|
records in groupby(insert,
|
|
lambda rec: (rec[4],
|
|
list(rec[2].keys()),
|
|
bool(rec[5]),
|
|
rec[6], rec[7])
|
|
):
|
|
if \
|
|
(
|
|
has_all_defaults
|
|
or not base_mapper.eager_defaults
|
|
or not connection.dialect.implicit_returning
|
|
) and has_all_pks and not hasvalue:
|
|
|
|
records = list(records)
|
|
multiparams = [rec[2] for rec in records]
|
|
|
|
c = cached_connections[connection].\
|
|
execute(statement, multiparams)
|
|
|
|
for (state, state_dict, params, mapper_rec,
|
|
conn, value_params, has_all_pks, has_all_defaults), \
|
|
last_inserted_params in \
|
|
zip(records, c.context.compiled_parameters):
|
|
_postfetch(
|
|
mapper_rec,
|
|
uowtransaction,
|
|
table,
|
|
state,
|
|
state_dict,
|
|
c,
|
|
last_inserted_params,
|
|
value_params)
|
|
|
|
else:
|
|
if not has_all_defaults and base_mapper.eager_defaults:
|
|
statement = statement.return_defaults()
|
|
elif mapper.version_id_col is not None:
|
|
statement = statement.return_defaults(mapper.version_id_col)
|
|
|
|
for state, state_dict, params, mapper_rec, \
|
|
connection, value_params, \
|
|
has_all_pks, has_all_defaults in records:
|
|
|
|
if value_params:
|
|
result = connection.execute(
|
|
statement.values(value_params),
|
|
params)
|
|
else:
|
|
result = cached_connections[connection].\
|
|
execute(statement, params)
|
|
|
|
primary_key = result.context.inserted_primary_key
|
|
|
|
if primary_key is not None:
|
|
# set primary key attributes
|
|
for pk, col in zip(primary_key,
|
|
mapper._pks_by_table[table]):
|
|
prop = mapper_rec._columntoproperty[col]
|
|
if state_dict.get(prop.key) is None:
|
|
# TODO: would rather say:
|
|
#state_dict[prop.key] = pk
|
|
mapper_rec._set_state_attr_by_column(
|
|
state,
|
|
state_dict,
|
|
col, pk)
|
|
|
|
_postfetch(
|
|
mapper_rec,
|
|
uowtransaction,
|
|
table,
|
|
state,
|
|
state_dict,
|
|
result,
|
|
result.context.compiled_parameters[0],
|
|
value_params)
|
|
|
|
|
|
def _emit_post_update_statements(base_mapper, uowtransaction,
|
|
cached_connections, mapper, table, update):
|
|
"""Emit UPDATE statements corresponding to value lists collected
|
|
by _collect_post_update_commands()."""
|
|
|
|
def update_stmt():
|
|
clause = sql.and_()
|
|
|
|
for col in mapper._pks_by_table[table]:
|
|
clause.clauses.append(col == sql.bindparam(col._label,
|
|
type_=col.type))
|
|
|
|
return table.update(clause)
|
|
|
|
statement = base_mapper._memo(('post_update', table), update_stmt)
|
|
|
|
# execute each UPDATE in the order according to the original
|
|
# list of states to guarantee row access order, but
|
|
# also group them into common (connection, cols) sets
|
|
# to support executemany().
|
|
for key, grouper in groupby(
|
|
update, lambda rec: (rec[4], list(rec[2].keys()))
|
|
):
|
|
connection = key[0]
|
|
multiparams = [params for state, state_dict,
|
|
params, mapper, conn in grouper]
|
|
cached_connections[connection].\
|
|
execute(statement, multiparams)
|
|
|
|
|
|
def _emit_delete_statements(base_mapper, uowtransaction, cached_connections,
|
|
mapper, table, delete):
|
|
"""Emit DELETE statements corresponding to value lists collected
|
|
by _collect_delete_commands()."""
|
|
|
|
need_version_id = mapper.version_id_col is not None and \
|
|
table.c.contains_column(mapper.version_id_col)
|
|
|
|
def delete_stmt():
|
|
clause = sql.and_()
|
|
for col in mapper._pks_by_table[table]:
|
|
clause.clauses.append(
|
|
col == sql.bindparam(col.key, type_=col.type))
|
|
|
|
if need_version_id:
|
|
clause.clauses.append(
|
|
mapper.version_id_col ==
|
|
sql.bindparam(
|
|
mapper.version_id_col.key,
|
|
type_=mapper.version_id_col.type
|
|
)
|
|
)
|
|
|
|
return table.delete(clause)
|
|
|
|
for connection, del_objects in delete.items():
|
|
statement = base_mapper._memo(('delete', table), delete_stmt)
|
|
|
|
connection = cached_connections[connection]
|
|
|
|
expected = len(del_objects)
|
|
rows_matched = -1
|
|
only_warn = False
|
|
if connection.dialect.supports_sane_multi_rowcount:
|
|
c = connection.execute(statement, del_objects)
|
|
|
|
if not need_version_id:
|
|
only_warn = True
|
|
|
|
rows_matched = c.rowcount
|
|
|
|
elif need_version_id:
|
|
if connection.dialect.supports_sane_rowcount:
|
|
rows_matched = 0
|
|
# execute deletes individually so that versioned
|
|
# rows can be verified
|
|
for params in del_objects:
|
|
c = connection.execute(statement, params)
|
|
rows_matched += c.rowcount
|
|
else:
|
|
util.warn(
|
|
"Dialect %s does not support deleted rowcount "
|
|
"- versioning cannot be verified." %
|
|
connection.dialect.dialect_description,
|
|
stacklevel=12)
|
|
connection.execute(statement, del_objects)
|
|
else:
|
|
connection.execute(statement, del_objects)
|
|
|
|
if base_mapper.confirm_deleted_rows and \
|
|
rows_matched > -1 and expected != rows_matched:
|
|
if only_warn:
|
|
util.warn(
|
|
"DELETE statement on table '%s' expected to "
|
|
"delete %d row(s); %d were matched. Please set "
|
|
"confirm_deleted_rows=False within the mapper "
|
|
"configuration to prevent this warning." %
|
|
(table.description, expected, rows_matched)
|
|
)
|
|
else:
|
|
raise orm_exc.StaleDataError(
|
|
"DELETE statement on table '%s' expected to "
|
|
"delete %d row(s); %d were matched. Please set "
|
|
"confirm_deleted_rows=False within the mapper "
|
|
"configuration to prevent this warning." %
|
|
(table.description, expected, rows_matched)
|
|
)
|
|
|
|
def _finalize_insert_update_commands(base_mapper, uowtransaction,
|
|
states_to_insert, states_to_update):
|
|
"""finalize state on states that have been inserted or updated,
|
|
including calling after_insert/after_update events.
|
|
|
|
"""
|
|
for state, state_dict, mapper, connection, has_identity, \
|
|
instance_key, row_switch in states_to_insert + \
|
|
states_to_update:
|
|
|
|
if mapper._readonly_props:
|
|
readonly = state.unmodified_intersection(
|
|
[p.key for p in mapper._readonly_props
|
|
if p.expire_on_flush or p.key not in state.dict]
|
|
)
|
|
if readonly:
|
|
state._expire_attributes(state.dict, readonly)
|
|
|
|
# if eager_defaults option is enabled, load
|
|
# all expired cols. Else if we have a version_id_col, make sure
|
|
# it isn't expired.
|
|
toload_now = []
|
|
|
|
if base_mapper.eager_defaults:
|
|
toload_now.extend(state._unloaded_non_object)
|
|
elif mapper.version_id_col is not None and \
|
|
mapper.version_id_generator is False:
|
|
prop = mapper._columntoproperty[mapper.version_id_col]
|
|
if prop.key in state.unloaded:
|
|
toload_now.extend([prop.key])
|
|
|
|
if toload_now:
|
|
state.key = base_mapper._identity_key_from_state(state)
|
|
loading.load_on_ident(
|
|
uowtransaction.session.query(base_mapper),
|
|
state.key, refresh_state=state,
|
|
only_load_props=toload_now)
|
|
|
|
# call after_XXX extensions
|
|
if not has_identity:
|
|
mapper.dispatch.after_insert(mapper, connection, state)
|
|
else:
|
|
mapper.dispatch.after_update(mapper, connection, state)
|
|
|
|
|
|
def _postfetch(mapper, uowtransaction, table,
|
|
state, dict_, result, params, value_params):
|
|
"""Expire attributes in need of newly persisted database state,
|
|
after an INSERT or UPDATE statement has proceeded for that
|
|
state."""
|
|
|
|
prefetch_cols = result.context.prefetch_cols
|
|
postfetch_cols = result.context.postfetch_cols
|
|
returning_cols = result.context.returning_cols
|
|
|
|
if mapper.version_id_col is not None:
|
|
prefetch_cols = list(prefetch_cols) + [mapper.version_id_col]
|
|
|
|
if returning_cols:
|
|
row = result.context.returned_defaults
|
|
if row is not None:
|
|
for col in returning_cols:
|
|
if col.primary_key:
|
|
continue
|
|
mapper._set_state_attr_by_column(state, dict_, col, row[col])
|
|
|
|
for c in prefetch_cols:
|
|
if c.key in params and c in mapper._columntoproperty:
|
|
mapper._set_state_attr_by_column(state, dict_, c, params[c.key])
|
|
|
|
if postfetch_cols:
|
|
state._expire_attributes(state.dict,
|
|
[mapper._columntoproperty[c].key
|
|
for c in postfetch_cols if c in
|
|
mapper._columntoproperty]
|
|
)
|
|
|
|
# synchronize newly inserted ids from one table to the next
|
|
# TODO: this still goes a little too often. would be nice to
|
|
# have definitive list of "columns that changed" here
|
|
for m, equated_pairs in mapper._table_to_equated[table]:
|
|
sync.populate(state, m, state, m,
|
|
equated_pairs,
|
|
uowtransaction,
|
|
mapper.passive_updates)
|
|
|
|
|
|
def _connections_for_states(base_mapper, uowtransaction, states):
|
|
"""Return an iterator of (state, state.dict, mapper, connection).
|
|
|
|
The states are sorted according to _sort_states, then paired
|
|
with the connection they should be using for the given
|
|
unit of work transaction.
|
|
|
|
"""
|
|
# if session has a connection callable,
|
|
# organize individual states with the connection
|
|
# to use for update
|
|
if uowtransaction.session.connection_callable:
|
|
connection_callable = \
|
|
uowtransaction.session.connection_callable
|
|
else:
|
|
connection = None
|
|
connection_callable = None
|
|
|
|
for state in _sort_states(states):
|
|
if connection_callable:
|
|
connection = connection_callable(base_mapper, state.obj())
|
|
elif not connection:
|
|
connection = uowtransaction.transaction.connection(
|
|
base_mapper)
|
|
|
|
mapper = _state_mapper(state)
|
|
|
|
yield state, state.dict, mapper, connection
|
|
|
|
|
|
def _cached_connection_dict(base_mapper):
|
|
# dictionary of connection->connection_with_cache_options.
|
|
return util.PopulateDict(
|
|
lambda conn: conn.execution_options(
|
|
compiled_cache=base_mapper._compiled_cache
|
|
))
|
|
|
|
|
|
def _sort_states(states):
|
|
pending = set(states)
|
|
persistent = set(s for s in pending if s.key is not None)
|
|
pending.difference_update(persistent)
|
|
return sorted(pending, key=operator.attrgetter("insert_order")) + \
|
|
sorted(persistent, key=lambda q: q.key[1])
|
|
|
|
|
|
class BulkUD(object):
|
|
"""Handle bulk update and deletes via a :class:`.Query`."""
|
|
|
|
def __init__(self, query):
|
|
self.query = query.enable_eagerloads(False)
|
|
|
|
@property
|
|
def session(self):
|
|
return self.query.session
|
|
|
|
@classmethod
|
|
def _factory(cls, lookup, synchronize_session, *arg):
|
|
try:
|
|
klass = lookup[synchronize_session]
|
|
except KeyError:
|
|
raise sa_exc.ArgumentError(
|
|
"Valid strategies for session synchronization "
|
|
"are %s" % (", ".join(sorted(repr(x)
|
|
for x in lookup))))
|
|
else:
|
|
return klass(*arg)
|
|
|
|
def exec_(self):
|
|
self._do_pre()
|
|
self._do_pre_synchronize()
|
|
self._do_exec()
|
|
self._do_post_synchronize()
|
|
self._do_post()
|
|
|
|
def _do_pre(self):
|
|
query = self.query
|
|
self.context = context = query._compile_context()
|
|
if len(context.statement.froms) != 1 or \
|
|
not isinstance(context.statement.froms[0], schema.Table):
|
|
|
|
self.primary_table = query._only_entity_zero(
|
|
"This operation requires only one Table or "
|
|
"entity be specified as the target."
|
|
).mapper.local_table
|
|
else:
|
|
self.primary_table = context.statement.froms[0]
|
|
|
|
session = query.session
|
|
|
|
if query._autoflush:
|
|
session._autoflush()
|
|
|
|
def _do_pre_synchronize(self):
|
|
pass
|
|
|
|
def _do_post_synchronize(self):
|
|
pass
|
|
|
|
|
|
class BulkEvaluate(BulkUD):
|
|
"""BulkUD which does the 'evaluate' method of session state resolution."""
|
|
|
|
def _additional_evaluators(self, evaluator_compiler):
|
|
pass
|
|
|
|
def _do_pre_synchronize(self):
|
|
query = self.query
|
|
try:
|
|
evaluator_compiler = evaluator.EvaluatorCompiler()
|
|
if query.whereclause is not None:
|
|
eval_condition = evaluator_compiler.process(
|
|
query.whereclause)
|
|
else:
|
|
def eval_condition(obj):
|
|
return True
|
|
|
|
self._additional_evaluators(evaluator_compiler)
|
|
|
|
except evaluator.UnevaluatableError:
|
|
raise sa_exc.InvalidRequestError(
|
|
"Could not evaluate current criteria in Python. "
|
|
"Specify 'fetch' or False for the "
|
|
"synchronize_session parameter.")
|
|
target_cls = query._mapper_zero().class_
|
|
|
|
#TODO: detect when the where clause is a trivial primary key match
|
|
self.matched_objects = [
|
|
obj for (cls, pk), obj in
|
|
query.session.identity_map.items()
|
|
if issubclass(cls, target_cls) and
|
|
eval_condition(obj)]
|
|
|
|
|
|
class BulkFetch(BulkUD):
|
|
"""BulkUD which does the 'fetch' method of session state resolution."""
|
|
|
|
def _do_pre_synchronize(self):
|
|
query = self.query
|
|
session = query.session
|
|
select_stmt = self.context.statement.with_only_columns(
|
|
self.primary_table.primary_key)
|
|
self.matched_rows = session.execute(
|
|
select_stmt,
|
|
params=query._params).fetchall()
|
|
|
|
|
|
class BulkUpdate(BulkUD):
|
|
"""BulkUD which handles UPDATEs."""
|
|
|
|
def __init__(self, query, values):
|
|
super(BulkUpdate, self).__init__(query)
|
|
self.query._no_select_modifiers("update")
|
|
self.values = values
|
|
|
|
@classmethod
|
|
def factory(cls, query, synchronize_session, values):
|
|
return BulkUD._factory({
|
|
"evaluate": BulkUpdateEvaluate,
|
|
"fetch": BulkUpdateFetch,
|
|
False: BulkUpdate
|
|
}, synchronize_session, query, values)
|
|
|
|
def _do_exec(self):
|
|
update_stmt = sql.update(self.primary_table,
|
|
self.context.whereclause, self.values)
|
|
|
|
self.result = self.query.session.execute(
|
|
update_stmt, params=self.query._params)
|
|
self.rowcount = self.result.rowcount
|
|
|
|
def _do_post(self):
|
|
session = self.query.session
|
|
session.dispatch.after_bulk_update(self)
|
|
|
|
|
|
class BulkDelete(BulkUD):
|
|
"""BulkUD which handles DELETEs."""
|
|
|
|
def __init__(self, query):
|
|
super(BulkDelete, self).__init__(query)
|
|
self.query._no_select_modifiers("delete")
|
|
|
|
@classmethod
|
|
def factory(cls, query, synchronize_session):
|
|
return BulkUD._factory({
|
|
"evaluate": BulkDeleteEvaluate,
|
|
"fetch": BulkDeleteFetch,
|
|
False: BulkDelete
|
|
}, synchronize_session, query)
|
|
|
|
def _do_exec(self):
|
|
delete_stmt = sql.delete(self.primary_table,
|
|
self.context.whereclause)
|
|
|
|
self.result = self.query.session.execute(delete_stmt,
|
|
params=self.query._params)
|
|
self.rowcount = self.result.rowcount
|
|
|
|
def _do_post(self):
|
|
session = self.query.session
|
|
session.dispatch.after_bulk_delete(self)
|
|
|
|
|
|
class BulkUpdateEvaluate(BulkEvaluate, BulkUpdate):
|
|
"""BulkUD which handles UPDATEs using the "evaluate"
|
|
method of session resolution."""
|
|
|
|
def _additional_evaluators(self, evaluator_compiler):
|
|
self.value_evaluators = {}
|
|
for key, value in self.values.items():
|
|
key = _attr_as_key(key)
|
|
self.value_evaluators[key] = evaluator_compiler.process(
|
|
expression._literal_as_binds(value))
|
|
|
|
def _do_post_synchronize(self):
|
|
session = self.query.session
|
|
states = set()
|
|
evaluated_keys = list(self.value_evaluators.keys())
|
|
for obj in self.matched_objects:
|
|
state, dict_ = attributes.instance_state(obj),\
|
|
attributes.instance_dict(obj)
|
|
|
|
# only evaluate unmodified attributes
|
|
to_evaluate = state.unmodified.intersection(
|
|
evaluated_keys)
|
|
for key in to_evaluate:
|
|
dict_[key] = self.value_evaluators[key](obj)
|
|
|
|
state._commit(dict_, list(to_evaluate))
|
|
|
|
# expire attributes with pending changes
|
|
# (there was no autoflush, so they are overwritten)
|
|
state._expire_attributes(dict_,
|
|
set(evaluated_keys).
|
|
difference(to_evaluate))
|
|
states.add(state)
|
|
session._register_altered(states)
|
|
|
|
|
|
class BulkDeleteEvaluate(BulkEvaluate, BulkDelete):
|
|
"""BulkUD which handles DELETEs using the "evaluate"
|
|
method of session resolution."""
|
|
|
|
def _do_post_synchronize(self):
|
|
self.query.session._remove_newly_deleted(
|
|
[attributes.instance_state(obj)
|
|
for obj in self.matched_objects])
|
|
|
|
|
|
class BulkUpdateFetch(BulkFetch, BulkUpdate):
|
|
"""BulkUD which handles UPDATEs using the "fetch"
|
|
method of session resolution."""
|
|
|
|
def _do_post_synchronize(self):
|
|
session = self.query.session
|
|
target_mapper = self.query._mapper_zero()
|
|
|
|
states = set([
|
|
attributes.instance_state(session.identity_map[identity_key])
|
|
for identity_key in [
|
|
target_mapper.identity_key_from_primary_key(
|
|
list(primary_key))
|
|
for primary_key in self.matched_rows
|
|
]
|
|
if identity_key in session.identity_map
|
|
])
|
|
attrib = [_attr_as_key(k) for k in self.values]
|
|
for state in states:
|
|
session._expire_state(state, attrib)
|
|
session._register_altered(states)
|
|
|
|
|
|
class BulkDeleteFetch(BulkFetch, BulkDelete):
|
|
"""BulkUD which handles DELETEs using the "fetch"
|
|
method of session resolution."""
|
|
|
|
def _do_post_synchronize(self):
|
|
session = self.query.session
|
|
target_mapper = self.query._mapper_zero()
|
|
for primary_key in self.matched_rows:
|
|
# TODO: inline this and call remove_newly_deleted
|
|
# once
|
|
identity_key = target_mapper.identity_key_from_primary_key(
|
|
list(primary_key))
|
|
if identity_key in session.identity_map:
|
|
session._remove_newly_deleted(
|
|
[attributes.instance_state(
|
|
session.identity_map[identity_key]
|
|
)]
|
|
)
|