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Diffstat (limited to 'parts/django/django/db/models/sql/subqueries.py')
| -rw-r--r-- | parts/django/django/db/models/sql/subqueries.py | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/parts/django/django/db/models/sql/subqueries.py b/parts/django/django/db/models/sql/subqueries.py deleted file mode 100644 index a0bdc94..0000000 --- a/parts/django/django/db/models/sql/subqueries.py +++ /dev/null @@ -1,212 +0,0 @@ -""" -Query subclasses which provide extra functionality beyond simple data retrieval. -""" - -from django.core.exceptions import FieldError -from django.db import connections -from django.db.models.sql.constants import * -from django.db.models.sql.datastructures import Date -from django.db.models.sql.expressions import SQLEvaluator -from django.db.models.sql.query import Query -from django.db.models.sql.where import AND, Constraint - - -__all__ = ['DeleteQuery', 'UpdateQuery', 'InsertQuery', 'DateQuery', - 'AggregateQuery'] - -class DeleteQuery(Query): - """ - Delete queries are done through this class, since they are more constrained - than general queries. - """ - - compiler = 'SQLDeleteCompiler' - - def do_query(self, table, where, using): - self.tables = [table] - self.where = where - self.get_compiler(using).execute_sql(None) - - def delete_batch(self, pk_list, using): - """ - Set up and execute delete queries for all the objects in pk_list. - - More than one physical query may be executed if there are a - lot of values in pk_list. - """ - for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE): - where = self.where_class() - field = self.model._meta.pk - where.add((Constraint(None, field.column, field), 'in', - pk_list[offset : offset + GET_ITERATOR_CHUNK_SIZE]), AND) - self.do_query(self.model._meta.db_table, where, using=using) - -class UpdateQuery(Query): - """ - Represents an "update" SQL query. - """ - - compiler = 'SQLUpdateCompiler' - - def __init__(self, *args, **kwargs): - super(UpdateQuery, self).__init__(*args, **kwargs) - self._setup_query() - - def _setup_query(self): - """ - Runs on initialization and after cloning. Any attributes that would - normally be set in __init__ should go in here, instead, so that they - are also set up after a clone() call. - """ - self.values = [] - self.related_ids = None - if not hasattr(self, 'related_updates'): - self.related_updates = {} - - def clone(self, klass=None, **kwargs): - return super(UpdateQuery, self).clone(klass, - related_updates=self.related_updates.copy(), **kwargs) - - - def clear_related(self, related_field, pk_list, using): - """ - Set up and execute an update query that clears related entries for the - keys in pk_list. - - This is used by the QuerySet.delete_objects() method. - """ - for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE): - self.where = self.where_class() - f = self.model._meta.pk - self.where.add((Constraint(None, f.column, f), 'in', - pk_list[offset : offset + GET_ITERATOR_CHUNK_SIZE]), - AND) - self.values = [(related_field, None, None)] - self.get_compiler(using).execute_sql(None) - - def add_update_values(self, values): - """ - Convert a dictionary of field name to value mappings into an update - query. This is the entry point for the public update() method on - querysets. - """ - values_seq = [] - for name, val in values.iteritems(): - field, model, direct, m2m = self.model._meta.get_field_by_name(name) - if not direct or m2m: - raise FieldError('Cannot update model field %r (only non-relations and foreign keys permitted).' % field) - if model: - self.add_related_update(model, field, val) - continue - values_seq.append((field, model, val)) - return self.add_update_fields(values_seq) - - def add_update_fields(self, values_seq): - """ - Turn a sequence of (field, model, value) triples into an update query. - Used by add_update_values() as well as the "fast" update path when - saving models. - """ - self.values.extend(values_seq) - - def add_related_update(self, model, field, value): - """ - Adds (name, value) to an update query for an ancestor model. - - Updates are coalesced so that we only run one update query per ancestor. - """ - try: - self.related_updates[model].append((field, None, value)) - except KeyError: - self.related_updates[model] = [(field, None, value)] - - def get_related_updates(self): - """ - Returns a list of query objects: one for each update required to an - ancestor model. Each query will have the same filtering conditions as - the current query but will only update a single table. - """ - if not self.related_updates: - return [] - result = [] - for model, values in self.related_updates.iteritems(): - query = UpdateQuery(model) - query.values = values - if self.related_ids is not None: - query.add_filter(('pk__in', self.related_ids)) - result.append(query) - return result - -class InsertQuery(Query): - compiler = 'SQLInsertCompiler' - - def __init__(self, *args, **kwargs): - super(InsertQuery, self).__init__(*args, **kwargs) - self.columns = [] - self.values = [] - self.params = () - - def clone(self, klass=None, **kwargs): - extras = { - 'columns': self.columns[:], - 'values': self.values[:], - 'params': self.params - } - extras.update(kwargs) - return super(InsertQuery, self).clone(klass, **extras) - - def insert_values(self, insert_values, raw_values=False): - """ - Set up the insert query from the 'insert_values' dictionary. The - dictionary gives the model field names and their target values. - - If 'raw_values' is True, the values in the 'insert_values' dictionary - are inserted directly into the query, rather than passed as SQL - parameters. This provides a way to insert NULL and DEFAULT keywords - into the query, for example. - """ - placeholders, values = [], [] - for field, val in insert_values: - placeholders.append((field, val)) - self.columns.append(field.column) - values.append(val) - if raw_values: - self.values.extend([(None, v) for v in values]) - else: - self.params += tuple(values) - self.values.extend(placeholders) - -class DateQuery(Query): - """ - A DateQuery is a normal query, except that it specifically selects a single - date field. This requires some special handling when converting the results - back to Python objects, so we put it in a separate class. - """ - - compiler = 'SQLDateCompiler' - - def add_date_select(self, field, lookup_type, order='ASC'): - """ - Converts the query into a date extraction query. - """ - result = self.setup_joins([field.name], self.get_meta(), - self.get_initial_alias(), False) - alias = result[3][-1] - select = Date((alias, field.column), lookup_type) - self.select = [select] - self.select_fields = [None] - self.select_related = False # See #7097. - self.set_extra_mask([]) - self.distinct = True - self.order_by = order == 'ASC' and [1] or [-1] - -class AggregateQuery(Query): - """ - An AggregateQuery takes another query as a parameter to the FROM - clause and only selects the elements in the provided list. - """ - - compiler = 'SQLAggregateCompiler' - - def add_subquery(self, query, using): - self.subquery, self.sub_params = query.get_compiler(using).as_sql(with_col_aliases=True) |