364 lines
11 KiB
Python
364 lines
11 KiB
Python
# sqlalchemy/exc.py
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# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""Exceptions used with SQLAlchemy.
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The base exception class is :exc:`.SQLAlchemyError`. Exceptions which are
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raised as a result of DBAPI exceptions are all subclasses of
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:exc:`.DBAPIError`.
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"""
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import traceback
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class SQLAlchemyError(Exception):
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"""Generic error class."""
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class ArgumentError(SQLAlchemyError):
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"""Raised when an invalid or conflicting function argument is supplied.
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This error generally corresponds to construction time state errors.
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"""
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class NoSuchModuleError(ArgumentError):
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"""Raised when a dynamically-loaded module (usually a database dialect)
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of a particular name cannot be located."""
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class NoForeignKeysError(ArgumentError):
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"""Raised when no foreign keys can be located between two selectables
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during a join."""
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class AmbiguousForeignKeysError(ArgumentError):
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"""Raised when more than one foreign key matching can be located
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between two selectables during a join."""
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class CircularDependencyError(SQLAlchemyError):
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"""Raised by topological sorts when a circular dependency is detected.
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There are two scenarios where this error occurs:
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* In a Session flush operation, if two objects are mutually dependent
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on each other, they can not be inserted or deleted via INSERT or
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DELETE statements alone; an UPDATE will be needed to post-associate
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or pre-deassociate one of the foreign key constrained values.
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The ``post_update`` flag described at :ref:`post_update` can resolve
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this cycle.
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* In a :meth:`.MetaData.create_all`, :meth:`.MetaData.drop_all`,
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:attr:`.MetaData.sorted_tables` operation, two :class:`.ForeignKey`
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or :class:`.ForeignKeyConstraint` objects mutually refer to each
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other. Apply the ``use_alter=True`` flag to one or both,
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see :ref:`use_alter`.
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"""
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def __init__(self, message, cycles, edges, msg=None):
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if msg is None:
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message += " Cycles: %r all edges: %r" % (cycles, edges)
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else:
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message = msg
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SQLAlchemyError.__init__(self, message)
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self.cycles = cycles
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self.edges = edges
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def __reduce__(self):
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return self.__class__, (None, self.cycles,
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self.edges, self.args[0])
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class CompileError(SQLAlchemyError):
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"""Raised when an error occurs during SQL compilation"""
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class UnsupportedCompilationError(CompileError):
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"""Raised when an operation is not supported by the given compiler.
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.. versionadded:: 0.8.3
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"""
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def __init__(self, compiler, element_type):
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super(UnsupportedCompilationError, self).__init__(
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"Compiler %r can't render element of type %s" %
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(compiler, element_type))
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class IdentifierError(SQLAlchemyError):
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"""Raised when a schema name is beyond the max character limit"""
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class DisconnectionError(SQLAlchemyError):
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"""A disconnect is detected on a raw DB-API connection.
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This error is raised and consumed internally by a connection pool. It can
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be raised by the :meth:`.PoolEvents.checkout` event so that the host pool
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forces a retry; the exception will be caught three times in a row before
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the pool gives up and raises :class:`~sqlalchemy.exc.InvalidRequestError`
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regarding the connection attempt.
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"""
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class TimeoutError(SQLAlchemyError):
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"""Raised when a connection pool times out on getting a connection."""
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class InvalidRequestError(SQLAlchemyError):
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"""SQLAlchemy was asked to do something it can't do.
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This error generally corresponds to runtime state errors.
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"""
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class NoInspectionAvailable(InvalidRequestError):
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"""A subject passed to :func:`sqlalchemy.inspection.inspect` produced
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no context for inspection."""
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class ResourceClosedError(InvalidRequestError):
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"""An operation was requested from a connection, cursor, or other
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object that's in a closed state."""
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class NoSuchColumnError(KeyError, InvalidRequestError):
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"""A nonexistent column is requested from a ``RowProxy``."""
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class NoReferenceError(InvalidRequestError):
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"""Raised by ``ForeignKey`` to indicate a reference cannot be resolved."""
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class NoReferencedTableError(NoReferenceError):
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"""Raised by ``ForeignKey`` when the referred ``Table`` cannot be
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located.
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"""
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def __init__(self, message, tname):
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NoReferenceError.__init__(self, message)
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self.table_name = tname
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def __reduce__(self):
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return self.__class__, (self.args[0], self.table_name)
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class NoReferencedColumnError(NoReferenceError):
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"""Raised by ``ForeignKey`` when the referred ``Column`` cannot be
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located.
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"""
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def __init__(self, message, tname, cname):
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NoReferenceError.__init__(self, message)
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self.table_name = tname
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self.column_name = cname
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def __reduce__(self):
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return self.__class__, (self.args[0], self.table_name,
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self.column_name)
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class NoSuchTableError(InvalidRequestError):
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"""Table does not exist or is not visible to a connection."""
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class UnboundExecutionError(InvalidRequestError):
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"""SQL was attempted without a database connection to execute it on."""
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class DontWrapMixin(object):
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"""A mixin class which, when applied to a user-defined Exception class,
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will not be wrapped inside of :exc:`.StatementError` if the error is
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emitted within the process of executing a statement.
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E.g.::
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from sqlalchemy.exc import DontWrapMixin
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class MyCustomException(Exception, DontWrapMixin):
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pass
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class MySpecialType(TypeDecorator):
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impl = String
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def process_bind_param(self, value, dialect):
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if value == 'invalid':
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raise MyCustomException("invalid!")
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"""
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# Moved to orm.exc; compatibility definition installed by orm import until 0.6
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UnmappedColumnError = None
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class StatementError(SQLAlchemyError):
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"""An error occurred during execution of a SQL statement.
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:class:`StatementError` wraps the exception raised
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during execution, and features :attr:`.statement`
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and :attr:`.params` attributes which supply context regarding
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the specifics of the statement which had an issue.
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The wrapped exception object is available in
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the :attr:`.orig` attribute.
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"""
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statement = None
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"""The string SQL statement being invoked when this exception occurred."""
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params = None
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"""The parameter list being used when this exception occurred."""
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orig = None
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"""The DBAPI exception object."""
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def __init__(self, message, statement, params, orig):
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SQLAlchemyError.__init__(self, message)
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self.statement = statement
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self.params = params
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self.orig = orig
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self.detail = []
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def add_detail(self, msg):
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self.detail.append(msg)
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def __reduce__(self):
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return self.__class__, (self.args[0], self.statement,
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self.params, self.orig)
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def __str__(self):
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from sqlalchemy.sql import util
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params_repr = util._repr_params(self.params, 10)
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return ' '.join([
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"(%s)" % det for det in self.detail
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] + [
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SQLAlchemyError.__str__(self),
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repr(self.statement), repr(params_repr)
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])
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def __unicode__(self):
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return self.__str__()
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class DBAPIError(StatementError):
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"""Raised when the execution of a database operation fails.
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Wraps exceptions raised by the DB-API underlying the
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database operation. Driver-specific implementations of the standard
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DB-API exception types are wrapped by matching sub-types of SQLAlchemy's
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:class:`DBAPIError` when possible. DB-API's ``Error`` type maps to
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:class:`DBAPIError` in SQLAlchemy, otherwise the names are identical. Note
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that there is no guarantee that different DB-API implementations will
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raise the same exception type for any given error condition.
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:class:`DBAPIError` features :attr:`~.StatementError.statement`
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and :attr:`~.StatementError.params` attributes which supply context
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regarding the specifics of the statement which had an issue, for the
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typical case when the error was raised within the context of
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emitting a SQL statement.
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The wrapped exception object is available in the
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:attr:`~.StatementError.orig` attribute. Its type and properties are
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DB-API implementation specific.
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"""
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@classmethod
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def instance(cls, statement, params,
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orig,
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dbapi_base_err,
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connection_invalidated=False):
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# Don't ever wrap these, just return them directly as if
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# DBAPIError didn't exist.
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if isinstance(orig, (KeyboardInterrupt, SystemExit, DontWrapMixin)):
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return orig
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if orig is not None:
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# not a DBAPI error, statement is present.
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# raise a StatementError
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if not isinstance(orig, dbapi_base_err) and statement:
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msg = traceback.format_exception_only(
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orig.__class__, orig)[-1].strip()
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return StatementError(
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"%s (original cause: %s)" % (str(orig), msg),
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statement, params, orig
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)
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name, glob = orig.__class__.__name__, globals()
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if name in glob and issubclass(glob[name], DBAPIError):
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cls = glob[name]
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return cls(statement, params, orig, connection_invalidated)
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def __reduce__(self):
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return self.__class__, (self.statement, self.params,
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self.orig, self.connection_invalidated)
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def __init__(self, statement, params, orig, connection_invalidated=False):
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try:
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text = str(orig)
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except (KeyboardInterrupt, SystemExit):
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raise
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except Exception as e:
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text = 'Error in str() of DB-API-generated exception: ' + str(e)
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StatementError.__init__(
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self,
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'(%s) %s' % (orig.__class__.__name__, text),
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statement,
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params,
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orig
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)
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self.connection_invalidated = connection_invalidated
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class InterfaceError(DBAPIError):
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"""Wraps a DB-API InterfaceError."""
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class DatabaseError(DBAPIError):
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"""Wraps a DB-API DatabaseError."""
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class DataError(DatabaseError):
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"""Wraps a DB-API DataError."""
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class OperationalError(DatabaseError):
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"""Wraps a DB-API OperationalError."""
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class IntegrityError(DatabaseError):
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"""Wraps a DB-API IntegrityError."""
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class InternalError(DatabaseError):
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"""Wraps a DB-API InternalError."""
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class ProgrammingError(DatabaseError):
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"""Wraps a DB-API ProgrammingError."""
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class NotSupportedError(DatabaseError):
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"""Wraps a DB-API NotSupportedError."""
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# Warnings
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class SADeprecationWarning(DeprecationWarning):
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"""Issued once per usage of a deprecated API."""
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class SAPendingDeprecationWarning(PendingDeprecationWarning):
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"""Issued once per usage of a deprecated API."""
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class SAWarning(RuntimeWarning):
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"""Issued at runtime."""
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