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venv/Lib/site-packages/django/db/models/sql/subqueries.py

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+"""
+Query subclasses which provide extra functionality beyond simple data retrieval.
+"""
+
+from django.core.exceptions import FieldError
+from django.db.models.sql.constants import (
+    CURSOR, GET_ITERATOR_CHUNK_SIZE, NO_RESULTS,
+)
+from django.db.models.sql.query import Query
+
+__all__ = ['DeleteQuery', 'UpdateQuery', 'InsertQuery', 'AggregateQuery']
+
+
+class DeleteQuery(Query):
+    """A DELETE SQL query."""
+
+    compiler = 'SQLDeleteCompiler'
+
+    def do_query(self, table, where, using):
+        self.alias_map = {table: self.alias_map[table]}
+        self.where = where
+        cursor = self.get_compiler(using).execute_sql(CURSOR)
+        if cursor:
+            with cursor:
+                return cursor.rowcount
+        return 0
+
+    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.
+        """
+        # number of objects deleted
+        num_deleted = 0
+        field = self.get_meta().pk
+        for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE):
+            self.clear_where()
+            self.add_filter(
+                f'{field.attname}__in',
+                pk_list[offset:offset + GET_ITERATOR_CHUNK_SIZE],
+            )
+            num_deleted += self.do_query(self.get_meta().db_table, self.where, using=using)
+        return num_deleted
+
+
+class UpdateQuery(Query):
+    """An UPDATE SQL query."""
+
+    compiler = 'SQLUpdateCompiler'
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self._setup_query()
+
+    def _setup_query(self):
+        """
+        Run on initialization and at the end of chaining. Any attributes that
+        would normally be set in __init__() should go here instead.
+        """
+        self.values = []
+        self.related_ids = None
+        self.related_updates = {}
+
+    def clone(self):
+        obj = super().clone()
+        obj.related_updates = self.related_updates.copy()
+        return obj
+
+    def update_batch(self, pk_list, values, using):
+        self.add_update_values(values)
+        for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE):
+            self.clear_where()
+            self.add_filter('pk__in', pk_list[offset: offset + GET_ITERATOR_CHUNK_SIZE])
+            self.get_compiler(using).execute_sql(NO_RESULTS)
+
+    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.items():
+            field = self.get_meta().get_field(name)
+            direct = not (field.auto_created and not field.concrete) or not field.concrete
+            model = field.model._meta.concrete_model
+            if not direct or (field.is_relation and field.many_to_many):
+                raise FieldError(
+                    'Cannot update model field %r (only non-relations and '
+                    'foreign keys permitted).' % field
+                )
+            if model is not self.get_meta().concrete_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):
+        """
+        Append a sequence of (field, model, value) triples to the internal list
+        that will be used to generate the UPDATE query. Might be more usefully
+        called add_update_targets() to hint at the extra information here.
+        """
+        for field, model, val in values_seq:
+            if hasattr(val, 'resolve_expression'):
+                # Resolve expressions here so that annotations are no longer needed
+                val = val.resolve_expression(self, allow_joins=False, for_save=True)
+            self.values.append((field, model, val))
+
+    def add_related_update(self, model, field, value):
+        """
+        Add (name, value) to an update query for an ancestor model.
+
+        Update are coalesced so that only one update query per ancestor is run.
+        """
+        self.related_updates.setdefault(model, []).append((field, None, value))
+
+    def get_related_updates(self):
+        """
+        Return 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.items():
+            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, ignore_conflicts=False, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields = []
+        self.objs = []
+        self.ignore_conflicts = ignore_conflicts
+
+    def insert_values(self, fields, objs, raw=False):
+        self.fields = fields
+        self.objs = objs
+        self.raw = raw
+
+
+class AggregateQuery(Query):
+    """
+    Take another query as a parameter to the FROM clause and only select the
+    elements in the provided list.
+    """
+
+    compiler = 'SQLAggregateCompiler'
+
+    def __init__(self, model, inner_query):
+        self.inner_query = inner_query
+        super().__init__(model)