SQLAlchemy 0.7.1 Documentation

Version: 0.7.1 Last Updated: 06/05/2011 13:13:59

ORM Exceptions

SQLAlchemy ORM exceptions.

sqlalchemy.orm.exc.ConcurrentModificationError

alias of StaleDataError

exception sqlalchemy.orm.exc.DetachedInstanceError

Bases: sqlalchemy.exc.SQLAlchemyError

An attempt to access unloaded attributes on a mapped instance that is detached.

exception sqlalchemy.orm.exc.FlushError

Bases: sqlalchemy.exc.SQLAlchemyError

A invalid condition was detected during flush().

exception sqlalchemy.orm.exc.MultipleResultsFound

Bases: sqlalchemy.exc.InvalidRequestError

A single database result was required but more than one were found.

sqlalchemy.orm.exc.NO_STATE

Exception types that may be raised by instrumentation implementations.

exception sqlalchemy.orm.exc.NoResultFound

Bases: sqlalchemy.exc.InvalidRequestError

A database result was required but none was found.

exception sqlalchemy.orm.exc.ObjectDeletedError

Bases: sqlalchemy.exc.InvalidRequestError

An refresh() operation failed to re-retrieve an object’s row.

exception sqlalchemy.orm.exc.ObjectDereferencedError

Bases: sqlalchemy.exc.SQLAlchemyError

An operation cannot complete due to an object being garbage collected.

exception sqlalchemy.orm.exc.StaleDataError

Bases: sqlalchemy.exc.SQLAlchemyError

An operation encountered database state that is unaccounted for.

Two conditions cause this to happen:

  • A flush may have attempted to update or delete rows and an unexpected number of rows were matched during the UPDATE or DELETE statement. Note that when version_id_col is used, rows in UPDATE or DELETE statements are also matched against the current known version identifier.
  • A mapped object with version_id_col was refreshed, and the version number coming back from the database does not match that of the object itself.
exception sqlalchemy.orm.exc.UnmappedClassError(cls, msg=None)

Bases: sqlalchemy.orm.exc.UnmappedError

An mapping operation was requested for an unknown class.

exception sqlalchemy.orm.exc.UnmappedColumnError

Bases: sqlalchemy.exc.InvalidRequestError

Mapping operation was requested on an unknown column.

exception sqlalchemy.orm.exc.UnmappedError

Bases: sqlalchemy.exc.InvalidRequestError

Base for exceptions that involve expected mappings not present.

exception sqlalchemy.orm.exc.UnmappedInstanceError(obj, msg=None)

Bases: sqlalchemy.orm.exc.UnmappedError

An mapping operation was requested for an unknown instance.

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