Method for_update_sql

django/db/backends/base/operations.py:238–247

Return the FOR UPDATE SQL clause to lock rows for an update operation.

(self, nowait=False, skip_locked=False, of=(), no_key=False)

        return []

    def for_update_sql(self, nowait=False, skip_locked=False, of=(), no_key=False):
        """
        Return the FOR UPDATE SQL clause to lock rows for an update operation.
        """
        return "FOR%s UPDATE%s%s%s" % (
            " NO KEY" if no_key else "",
            " OF %s" % ", ".join(of) if of else "",
            " NOWAIT" if nowait else "",
            " SKIP LOCKED" if skip_locked else "",
        )

    def _get_limit_offset_params(self, low_mark, high_mark):
        offset = low_mark or 0