mirror of
https://github.com/janeczku/calibre-web
synced 2024-12-01 05:49:58 +00:00
356 lines
11 KiB
Python
356 lines
11 KiB
Python
# sqlalchemy/exc.py
|
|
# Copyright (C) 2005-2013 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`.
|
|
|
|
"""
|
|
|
|
import traceback
|
|
|
|
|
|
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 NoForeignKeysError(ArgumentError):
|
|
"""Raised when no foreign keys can be located between two selectables
|
|
during a join."""
|
|
|
|
|
|
class AmbiguousForeignKeysError(ArgumentError):
|
|
"""Raised when more than one foreign key matching can be located
|
|
between two selectables during a join."""
|
|
|
|
|
|
class CircularDependencyError(SQLAlchemyError):
|
|
"""Raised by topological sorts when a circular dependency is detected.
|
|
|
|
There are two scenarios where this error occurs:
|
|
|
|
* In a Session flush operation, if two objects are mutually dependent
|
|
on each other, they can not be inserted or deleted via INSERT or
|
|
DELETE statements alone; an UPDATE will be needed to post-associate
|
|
or pre-deassociate one of the foreign key constrained values.
|
|
The ``post_update`` flag described at :ref:`post_update` can resolve
|
|
this cycle.
|
|
* In a :meth:`.MetaData.create_all`, :meth:`.MetaData.drop_all`,
|
|
:attr:`.MetaData.sorted_tables` operation, two :class:`.ForeignKey`
|
|
or :class:`.ForeignKeyConstraint` objects mutually refer to each
|
|
other. Apply the ``use_alter=True`` flag to one or both,
|
|
see :ref:`use_alter`.
|
|
|
|
"""
|
|
def __init__(self, message, cycles, edges, msg=None):
|
|
if msg is None:
|
|
message += " Cycles: %r all edges: %r" % (cycles, edges)
|
|
else:
|
|
message = msg
|
|
SQLAlchemyError.__init__(self, message)
|
|
self.cycles = cycles
|
|
self.edges = edges
|
|
|
|
def __reduce__(self):
|
|
return self.__class__, (None, self.cycles,
|
|
self.edges, self.args[0])
|
|
|
|
|
|
class CompileError(SQLAlchemyError):
|
|
"""Raised when an error occurs during SQL compilation"""
|
|
|
|
class UnsupportedCompilationError(CompileError):
|
|
"""Raised when an operation is not supported by the given compiler.
|
|
|
|
|
|
.. versionadded:: 0.8.3
|
|
|
|
"""
|
|
|
|
def __init__(self, compiler, element_type):
|
|
super(UnsupportedCompilationError, self).__init__(
|
|
"Compiler %r can't render element of type %s" %
|
|
(compiler, element_type))
|
|
|
|
class IdentifierError(SQLAlchemyError):
|
|
"""Raised when a schema name is beyond the max character limit"""
|
|
|
|
|
|
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 the :meth:`.PoolEvents.checkout` event so that the host pool
|
|
forces a retry; the exception will be caught three times in a row before
|
|
the pool gives up and raises :class:`~sqlalchemy.exc.InvalidRequestError`
|
|
regarding the connection attempt.
|
|
|
|
"""
|
|
|
|
|
|
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 NoInspectionAvailable(InvalidRequestError):
|
|
"""A subject passed to :func:`sqlalchemy.inspection.inspect` produced
|
|
no context for inspection."""
|
|
|
|
|
|
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
|
|
|
|
def __reduce__(self):
|
|
return self.__class__, (self.args[0], self.table_name)
|
|
|
|
|
|
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
|
|
|
|
def __reduce__(self):
|
|
return self.__class__, (self.args[0], self.table_name,
|
|
self.column_name)
|
|
|
|
|
|
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."""
|
|
|
|
|
|
class DontWrapMixin(object):
|
|
"""A mixin class which, when applied to a user-defined Exception class,
|
|
will not be wrapped inside of :class:`.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!")
|
|
|
|
"""
|
|
import sys
|
|
if sys.version_info < (2, 5):
|
|
class DontWrapMixin:
|
|
pass
|
|
|
|
# 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.
|
|
|
|
"""
|
|
|
|
statement = None
|
|
"""The string SQL statement being invoked when this exception occurred."""
|
|
|
|
params = None
|
|
"""The parameter list being used when this exception occurred."""
|
|
|
|
orig = None
|
|
"""The DBAPI exception object."""
|
|
|
|
def __init__(self, message, statement, params, orig):
|
|
SQLAlchemyError.__init__(self, message)
|
|
self.statement = statement
|
|
self.params = params
|
|
self.orig = orig
|
|
|
|
def __reduce__(self):
|
|
return self.__class__, (self.args[0], self.statement,
|
|
self.params, self.orig)
|
|
|
|
def __str__(self):
|
|
from sqlalchemy.sql import util
|
|
params_repr = util._repr_params(self.params, 10)
|
|
return ' '.join((SQLAlchemyError.__str__(self),
|
|
repr(self.statement), repr(params_repr)))
|
|
|
|
def __unicode__(self):
|
|
return self.__str__()
|
|
|
|
|
|
class DBAPIError(StatementError):
|
|
"""Raised when the execution of a database operation fails.
|
|
|
|
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
|
|
:class:`DBAPIError` when possible. DB-API's ``Error`` type maps to
|
|
:class:`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:`~.StatementError.statement`
|
|
and :attr:`~.StatementError.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:`~.StatementError.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, DontWrapMixin)):
|
|
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:
|
|
msg = traceback.format_exception_only(
|
|
orig.__class__, orig)[-1].strip()
|
|
return StatementError(
|
|
"%s (original cause: %s)" % (str(orig), msg),
|
|
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 __reduce__(self):
|
|
return self.__class__, (self.statement, self.params,
|
|
self.orig, self.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."""
|