Class NullLambdaStatement

lib/sqlalchemy/sql/lambdas.py:654–698

Provides the :class:`.StatementLambdaElement` API but does not cache or analyze lambdas. the lambdas are instead invoked immediately. The intended use is to isolate issues that may arise when using lambda statements.

class NullLambdaStatement(roles.AllowsLambdaRole, elements.ClauseElement):
    """Provides the :class:`.StatementLambdaElement` API but does not
    cache or analyze lambdas.

    the lambdas are instead invoked immediately.

    The intended use is to isolate issues that may arise when using
    lambda statements.

    """

    __visit_name__ = "lambda_element"

    _is_lambda_element = True

    _traverse_internals = [
        ("_resolved", visitors.InternalTraversal.dp_clauseelement)
    ]

    def __init__(self, statement):
        self._resolved = statement
        self._propagate_attrs = statement._propagate_attrs

    def __getattr__(self, key):
        return getattr(self._resolved, key)

    def __add__(self, other):
        statement = other(self._resolved)

        return NullLambdaStatement(statement)

    def add_criteria(self, other, **kw):
        statement = other(self._resolved)

        return NullLambdaStatement(statement)

    def _execute_on_connection(
        self, connection, distilled_params, execution_options
    ):
        if self._resolved.supports_execution:
            return connection._execute_clauseelement(
                self, distilled_params, execution_options
            )
        else:
            raise exc.ObjectNotExecutableError(self)


class LinkedLambdaElement(StatementLambdaElement):