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# sqlalchemy/exc.py
# Copyright (C) 2005-2011 the SQLAlchemy authors and contributors <see AUTHORS file>
#
# 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 :class:`.SQLAlchemyError`. Exceptions which are raised as a
result of DBAPI exceptions are all subclasses of
:class:`.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"""
def __init__(self, message, cycles, edges):
message += ": cycles: %r all edges: %r" % (cycles, edges)
SQLAlchemyError.__init__(self, message)
self.cycles = cycles
self.edges = edges
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; compatibility 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; compatibility 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 ResourceClosedError(InvalidRequestError):
"""An operation was requested from a connection, cursor, or other
object that's in a closed state."""
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."""
def __init__(self, message, tname):
NoReferenceError.__init__(self, message)
self.table_name = tname
class NoReferencedColumnError(NoReferenceError):
"""Raised by ``ForeignKey`` when the referred ``Column`` cannot be located."""
def __init__(self, message, tname, cname):
NoReferenceError.__init__(self, message)
self.table_name = tname
self.column_name = cname
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; compatibility definition installed by orm import until 0.6
UnmappedColumnError = None
class StatementError(SQLAlchemyError):
"""An error occurred during execution of a SQL statement.
:class:`.StatementError` wraps the exception raised
during execution, and features :attr:`.statement`
and :attr:`.params` attributes which supply context regarding
the specifics of the statement which had an issue.
The wrapped exception object is available in
the :attr:`.orig` attribute.
"""
def __init__(self, message, statement, params, orig):
SQLAlchemyError.__init__(self, message)
self.statement = statement
self.params = params
self.orig = orig
def __str__(self):
if isinstance(self.params, (list, tuple)) and \
len(self.params) > 10 and \
isinstance(self.params[0], (list, dict, tuple)):
return ' '.join((SQLAlchemyError.__str__(self),
repr(self.statement),
repr(self.params[:2]),
'... and a total of %i bound parameter sets' % len(self.params)))
return ' '.join((SQLAlchemyError.__str__(self),
repr(self.statement), repr(self.params)))
class DBAPIError(StatementError):
"""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.
:class:`.DBAPIError` features :attr:`.statement`
and :attr:`.params` attributes which supply context regarding
the specifics of the statement which had an issue, for the
typical case when the error was raised within the context of
emitting a SQL statement.
The wrapped exception object is available in the :attr:`.orig` attribute.
Its type and properties are DB-API implementation specific.
"""
@classmethod
def instance(cls, statement, params,
orig,
dbapi_base_err,
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:
# not a DBAPI error, statement is present.
# raise a StatementError
if not isinstance(orig, dbapi_base_err) and statement:
return StatementError(str(orig), statement, params, orig)
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)
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)
StatementError.__init__(
self,
'(%s) %s' % (orig.__class__.__name__, text),
statement,
params,
orig
)
self.connection_invalidated = connection_invalidated
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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