django.db.models.sql.compiler.SQLUpdateCompiler

Method	`as_sql`	Create the SQL for this query. Return the SQL string and list of parameters.
Method	`execute_sql`	No summary
Method	`pre_sql_setup`	If the update depends on results from other tables, munge the "where" conditions to match the format required for (portable) SQL updates.

Inherited from SQLCompiler:

Method	`__init__`	Undocumented
Method	`_order_by_pairs`	Undocumented
Method	`_setup_joins`	Helper method for get_order_by() and get_distinct().
Method	`apply_converters`	Undocumented
Method	`as_subquery_condition`	Undocumented
Method	`collapse_group_by`	Undocumented
Method	`compile`	Undocumented
Method	`deferred_to_columns`	Convert the self.deferred_loading data structure to mapping of table names to sets of column names which are to be loaded. Return the dictionary.
Method	`explain_query`	Undocumented
Method	`find_ordering_name`	Return the table alias (the name might be ambiguous, the alias will not be) and column name for ordering by the given 'name' parameter. The 'name' is of the form 'field1__field2__...__fieldN'.
Method	`get_combinator_sql`	Undocumented
Method	`get_converters`	Undocumented
Method	`get_default_columns`	No summary
Method	`get_distinct`	Return a quoted list of fields to use in DISTINCT ON part of the query.
Method	`get_extra_select`	Undocumented
Method	`get_from_clause`	No summary
Method	`get_group_by`	Return a list of 2-tuples of form (sql, params).
Method	`get_order_by`	Return a list of 2-tuples of the form (expr, (sql, params, is_ref)) for the ORDER BY clause.
Method	`get_related_selections`	No summary
Method	`get_select`	No summary
Method	`get_select_for_update_of_arguments`	Return a quoted list of arguments for the SELECT FOR UPDATE OF part of the query.
Method	`has_results`	Backends (e.g. NoSQL) can override this in order to use optimized versions of "query has any results."
Method	`quote_name_unless_alias`	A wrapper around connection.ops.quote_name that doesn't quote aliases for table names. This avoids problems with some SQL dialects that treat quoted strings specially (e.g. PostgreSQL).
Method	`results_iter`	Return an iterator over the results from executing this query.
Method	`setup_query`	Undocumented
Class Variable	`ordering_parts`	Undocumented
Instance Variable	`_meta_ordering`	Undocumented
Instance Variable	`annotation_col_map`	Undocumented
Instance Variable	`col_count`	Undocumented
Instance Variable	`connection`	Undocumented
Instance Variable	`elide_empty`	Undocumented
Instance Variable	`has_extra_select`	Undocumented
Instance Variable	`having`	Undocumented
Instance Variable	`klass_info`	Undocumented
Instance Variable	`query`	Undocumented
Instance Variable	`quote_cache`	Undocumented
Instance Variable	`select`	Undocumented
Instance Variable	`using`	Undocumented
Instance Variable	`where`	Undocumented

def as_sql(self):

overrides django.db.models.sql.compiler.SQLCompiler.as_sql

overridden in django.db.backends.mysql.compiler.SQLUpdateCompiler

Create the SQL for this query. Return the SQL string and list of parameters.

def execute_sql(self, result_type):

overrides django.db.models.sql.compiler.SQLCompiler.execute_sql

Execute the specified update. Return the number of rows affected by the primary update query. The "primary update query" is the first non-empty query that is executed. Row counts for any subsequent, related queries are not available.

def pre_sql_setup(self):

overrides django.db.models.sql.compiler.SQLCompiler.pre_sql_setup

If the update depends on results from other tables, munge the "where" conditions to match the format required for (portable) SQL updates.

If multiple updates are required, pull out the id values to update at this point so that they don't change as a result of the progressive updates.