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# Copyright (C) 2005, 2006, 2007, 2008, 2009 Michael Bayer mike_mp@zzzcomputing.com
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Exceptions used with SQLAlchemy.
The base exception class is SQLAlchemyError. Exceptions which are raised as a
result of DBAPI exceptions are all subclasses of
:class:`~sqlalchemy.exc.DBAPIError`.
"""
class SQLAlchemyError(Exception):
"""Generic error class."""
class ArgumentError(SQLAlchemyError):
"""Raised when an invalid or conflicting function argument is supplied.
This error generally corresponds to construction time state errors.
"""
class CircularDependencyError(SQLAlchemyError):
"""Raised by topological sorts when a circular dependency is detected"""
class CompileError(SQLAlchemyError):
"""Raised when an error occurs during SQL compilation"""
class IdentifierError(SQLAlchemyError):
"""Raised when a schema name is beyond the max character limit"""
# Moved to orm.exc; compatability definition installed by orm import until 0.6
ConcurrentModificationError = None
class DisconnectionError(SQLAlchemyError):
"""A disconnect is detected on a raw DB-API connection.
This error is raised and consumed internally by a connection pool. It can
be raised by a ``PoolListener`` so that the host pool forces a disconnect.
"""
# Moved to orm.exc; compatability definition installed by orm import until 0.6
FlushError = None
class TimeoutError(SQLAlchemyError):
"""Raised when a connection pool times out on getting a connection."""
class InvalidRequestError(SQLAlchemyError):
"""SQLAlchemy was asked to do something it can't do.
This error generally corresponds to runtime state errors.
"""
class NoSuchColumnError(KeyError, InvalidRequestError):
"""A nonexistent column is requested from a ``RowProxy``."""
class NoReferenceError(InvalidRequestError):
"""Raised by ``ForeignKey`` to indicate a reference cannot be resolved."""
class NoReferencedTableError(NoReferenceError):
"""Raised by ``ForeignKey`` when the referred ``Table`` cannot be located."""
class NoReferencedColumnError(NoReferenceError):
"""Raised by ``ForeignKey`` when the referred ``Column`` cannot be located."""
class NoSuchTableError(InvalidRequestError):
"""Table does not exist or is not visible to a connection."""
class UnboundExecutionError(InvalidRequestError):
"""SQL was attempted without a database connection to execute it on."""
# Moved to orm.exc; compatability definition installed by orm import until 0.6
UnmappedColumnError = None
class DBAPIError(SQLAlchemyError):
"""Raised when the execution of a database operation fails.
``DBAPIError`` wraps exceptions raised by the DB-API underlying the
database operation. Driver-specific implementations of the standard
DB-API exception types are wrapped by matching sub-types of SQLAlchemy's
``DBAPIError`` when possible. DB-API's ``Error`` type maps to
``DBAPIError`` in SQLAlchemy, otherwise the names are identical. Note
that there is no guarantee that different DB-API implementations will
raise the same exception type for any given error condition.
If the error-raising operation occured in the execution of a SQL
statement, that statement and its parameters will be available on
the exception object in the ``statement`` and ``params`` attributes.
The wrapped exception object is available in the ``orig`` attribute.
Its type and properties are DB-API implementation specific.
"""
def instance(cls, statement, params, orig, connection_invalidated=False):
# Don't ever wrap these, just return them directly as if
# DBAPIError didn't exist.
if isinstance(orig, (KeyboardInterrupt, SystemExit)):
return orig
if orig is not None:
name, glob = orig.__class__.__name__, globals()
if name in glob and issubclass(glob[name], DBAPIError):
cls = glob[name]
return cls(statement, params, orig, connection_invalidated)
instance = classmethod(instance)
def __init__(self, statement, params, orig, connection_invalidated=False):
try:
text = str(orig)
except (KeyboardInterrupt, SystemExit):
raise
except Exception, e:
text = 'Error in str() of DB-API-generated exception: ' + str(e)
SQLAlchemyError.__init__(
self, '(%s) %s' % (orig.__class__.__name__, text))
self.statement = statement
self.params = params
self.orig = orig
self.connection_invalidated = connection_invalidated
def __str__(self):
return ' '.join((SQLAlchemyError.__str__(self),
repr(self.statement), repr(self.params)))
# As of 0.4, SQLError is now DBAPIError.
# SQLError alias will be removed in 0.6.
SQLError = DBAPIError
class InterfaceError(DBAPIError):
"""Wraps a DB-API InterfaceError."""
class DatabaseError(DBAPIError):
"""Wraps a DB-API DatabaseError."""
class DataError(DatabaseError):
"""Wraps a DB-API DataError."""
class OperationalError(DatabaseError):
"""Wraps a DB-API OperationalError."""
class IntegrityError(DatabaseError):
"""Wraps a DB-API IntegrityError."""
class InternalError(DatabaseError):
"""Wraps a DB-API InternalError."""
class ProgrammingError(DatabaseError):
"""Wraps a DB-API ProgrammingError."""
class NotSupportedError(DatabaseError):
"""Wraps a DB-API NotSupportedError."""
# Warnings
class SADeprecationWarning(DeprecationWarning):
"""Issued once per usage of a deprecated API."""
class SAPendingDeprecationWarning(PendingDeprecationWarning):
"""Issued once per usage of a deprecated API."""
class SAWarning(RuntimeWarning):
"""Issued at runtime."""
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