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777 lines
30 KiB
777 lines
30 KiB
# orm/persistence.py
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# Copyright (C) 2005-2012 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 sqlalchemy import sql, util, exc as sa_exc
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from sqlalchemy.orm import attributes, sync, \
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exc as orm_exc
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from sqlalchemy.orm.util import _state_mapper, state_str
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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.iteritems():
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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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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.iteritems():
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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(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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# 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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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.key] = mapper.version_id_generator(None)
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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 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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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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params[col.key] = mapper.version_id_generator(
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params[col._label])
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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.itervalues():
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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 sa_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_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 sa_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_=col.type))
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return table.update(clause)
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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.context.prefetch_cols,
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c.context.postfetch_cols,
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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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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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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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def _emit_insert_statements(base_mapper, uowtransaction,
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cached_connections, table, insert):
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"""Emit INSERT statements corresponding to value lists collected
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by _collect_insert_commands()."""
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statement = base_mapper._memo(('insert', table), table.insert)
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for (connection, pkeys, hasvalue, has_all_pks), \
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records in groupby(insert,
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lambda rec: (rec[4],
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rec[2].keys(),
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bool(rec[5]),
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rec[6])
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):
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if has_all_pks and not hasvalue:
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records = list(records)
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multiparams = [rec[2] for rec in records]
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c = cached_connections[connection].\
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execute(statement, multiparams)
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for (state, state_dict, params, mapper,
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conn, value_params, has_all_pks), \
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last_inserted_params in \
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zip(records, c.context.compiled_parameters):
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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,
|
|
c.context.prefetch_cols,
|
|
c.context.postfetch_cols,
|
|
last_inserted_params,
|
|
value_params)
|
|
|
|
else:
|
|
for state, state_dict, params, mapper, \
|
|
connection, value_params, \
|
|
has_all_pks 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._columntoproperty[col]
|
|
if state_dict.get(prop.key) is None:
|
|
# TODO: would rather say:
|
|
#state_dict[prop.key] = pk
|
|
mapper._set_state_attr_by_column(
|
|
state,
|
|
state_dict,
|
|
col, pk)
|
|
|
|
_postfetch(
|
|
mapper,
|
|
uowtransaction,
|
|
table,
|
|
state,
|
|
state_dict,
|
|
result.context.prefetch_cols,
|
|
result.context.postfetch_cols,
|
|
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], 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.iteritems():
|
|
statement = base_mapper._memo(('delete', table), delete_stmt)
|
|
|
|
connection = cached_connections[connection]
|
|
|
|
if need_version_id:
|
|
# TODO: need test coverage for this [ticket:1761]
|
|
if connection.dialect.supports_sane_rowcount:
|
|
rows = 0
|
|
# execute deletes individually so that versioned
|
|
# rows can be verified
|
|
for params in del_objects:
|
|
c = connection.execute(statement, params)
|
|
rows += c.rowcount
|
|
if rows != len(del_objects):
|
|
raise orm_exc.StaleDataError(
|
|
"DELETE statement on table '%s' expected to "
|
|
"delete %d row(s); %d were matched." %
|
|
(table.description, len(del_objects), 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)
|
|
|
|
|
|
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,
|
|
# refresh whatever has been expired.
|
|
if base_mapper.eager_defaults and state.unloaded:
|
|
state.key = base_mapper._identity_key_from_state(state)
|
|
uowtransaction.session.query(base_mapper)._load_on_ident(
|
|
state.key, refresh_state=state,
|
|
only_load_props=state.unloaded)
|
|
|
|
# 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_, prefetch_cols, postfetch_cols,
|
|
params, value_params):
|
|
"""Expire attributes in need of newly persisted database state,
|
|
after an INSERT or UPDATE statement has proceeded for that
|
|
state."""
|
|
|
|
if mapper.version_id_col is not None:
|
|
prefetch_cols = list(prefetch_cols) + [mapper.version_id_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 = uowtransaction.transaction.connection(
|
|
base_mapper)
|
|
connection_callable = None
|
|
|
|
for state in _sort_states(states):
|
|
if connection_callable:
|
|
connection = connection_callable(base_mapper, state.obj())
|
|
|
|
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])
|
|
|
|
|
|
|