class documentation
class DontWrapMixin: (source)
A mixin class which, when applied to a user-defined Exception class, will not be wrapped inside of :exc:`.StatementError` if the error is emitted within the process of executing a statement. E.g.:: from sqlalchemy.exc import DontWrapMixin class MyCustomException(Exception, DontWrapMixin): pass class MySpecialType(TypeDecorator): impl = String def process_bind_param(self, value, dialect): if value == 'invalid': raise MyCustomException("invalid!")