google.appengine.ext.db package provides the following exception classes:
- exception Error()
This is the base class for all exceptions in this package.
- exception BadArgumentError()
- A bad argument was given to a query method.
- exception BadFilterError()
- A filter string in the query is invalid.
- exception BadKeyError()
- The provided key string is not a valid key.
- exception BadPropertyError()
- The property could not be created because its name is not a string.
- exception BadQueryError()
- The query string is not a valid query.
- exception BadRequestError()
- The request to the datastore service has one or more invalid properties. This is possible if a subclass of Model overrides some methods (such as kind()) with an incorrect implementation.
- exception BadValueError()
- The property could not be assigned a value because the value is invalid for the property type.
- exception ConfigurationError()
- A property is not configured correctly.
- exception DuplicatePropertyError()
- A model definition has more than one property with the same name.
- exception InternalError()
- There was an error internal to the datastore service. This exception does not necessarily mean that the operation failed.
- exception KindError()
- The application attempted to use a data entity with a model class that does not match the entity.
- exception NeedIndexError()
- Raised when the SDK does not find a matching index for a query that requires one. Check the Administration Console to manage your indexes and your index.yaml file.
- exception NotSavedError()
- An action was performed that requires the object to have been saved (put) to the datastore, but the object is not saved.
- exception PropertyError()
- The referenced model property does not exist on the data object.
- exception ReferencePropertyResolveError()
- The model referenced by a ReferenceProperty does not exist. See References.
- exception ReservedWordError()
- A model defines a property whose name is disallowed. See Disallowed Property Names.
- exception Rollback()
- Indicates that a function in a transaction wants to roll back the transaction instead of committing it. Any uncaught exception in a transaction will cause the transaction to roll back. This exception class is for convenience, when a function wants to roll back and no other exception applies.
- exception Timeout()
- Raised when the datastore operation exceeds the maximum amount of time allowed for datastore operations. This exception does not necessarily mean that the operation failed.
- exception TransactionFailedError()
- The transaction or datastore operation could not be committed, even after retrying. This is usually caused by a high rate of contention: The data is being updated by many other application instances simultaneously, and this instance could not commit its transaction within a fixed number of retries. See Transactions.
google.appengine.runtime.apiproxy_errors package provides the following exception classes:
- exception CapabilityDisabledError()
Indicates that a datastore api call was not performed as that particular datastore functionality is not available.