599 lines
17 KiB
Python
599 lines
17 KiB
Python
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# sqlalchemy/exc.py
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# Copyright (C) 2005-2019 the SQLAlchemy authors and contributors
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# <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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from .util import compat
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class SQLAlchemyError(Exception):
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"""Generic error class."""
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code = None
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def __init__(self, *arg, **kw):
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code = kw.pop("code", None)
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if code is not None:
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self.code = code
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super(SQLAlchemyError, self).__init__(*arg, **kw)
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def _code_str(self):
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if not self.code:
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return ""
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else:
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return (
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"(Background on this error at: "
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"http://sqlalche.me/e/%s)" % (self.code,)
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)
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def _message(self, as_unicode=compat.py3k):
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# rules:
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#
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# 1. under py2k, for __str__ return single string arg as it was
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# given without converting to unicode. for __unicode__
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# do a conversion but check that it's not unicode already just in
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# case
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#
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# 2. under py3k, single arg string will usually be a unicode
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# object, but since __str__() must return unicode, check for
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# bytestring just in case
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#
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# 3. for multiple self.args, this is not a case in current
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# SQLAlchemy though this is happening in at least one known external
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# library, call str() which does a repr().
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#
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if len(self.args) == 1:
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text = self.args[0]
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if as_unicode and isinstance(text, compat.binary_types):
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return compat.decode_backslashreplace(text, "utf-8")
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else:
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return self.args[0]
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else:
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# this is not a normal case within SQLAlchemy but is here for
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# compatibility with Exception.args - the str() comes out as
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# a repr() of the tuple
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return str(self.args)
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def _sql_message(self, as_unicode):
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message = self._message(as_unicode)
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if self.code:
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message = "%s %s" % (message, self._code_str())
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return message
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def __str__(self):
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return self._sql_message(compat.py3k)
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def __unicode__(self):
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return self._sql_message(as_unicode=True)
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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 ObjectNotExecutableError(ArgumentError):
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"""Raised when an object is passed to .execute() that can't be
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executed as SQL.
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.. versionadded:: 1.1
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"""
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def __init__(self, target):
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super(ObjectNotExecutableError, self).__init__(
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"Not an executable object: %r" % target
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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 :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, code=None):
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if msg is None:
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message += " (%s)" % ", ".join(repr(s) for s in cycles)
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else:
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message = msg
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SQLAlchemyError.__init__(self, message, code=code)
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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, 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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.. seealso::
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:ref:`faq_sql_expression_string`
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:ref:`error_l7de`
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"""
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code = "l7de"
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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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)
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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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invalidate_pool = False
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class InvalidatePoolError(DisconnectionError):
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"""Raised when the connection pool should invalidate all stale connections.
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A subclass of :class:`.DisconnectionError` that indicates that the
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disconnect situation encountered on the connection probably means the
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entire pool should be invalidated, as the database has been restarted.
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This exception will be handled otherwise the same way as
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:class:`.DisconnectionError`, allowing three attempts to reconnect
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before giving up.
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.. versionadded:: 1.2
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"""
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invalidate_pool = True
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class TimeoutError(SQLAlchemyError): # noqa
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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 (
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self.__class__,
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(self.args[0], self.table_name, self.column_name),
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)
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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 UnreflectableTableError(InvalidRequestError):
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"""Table exists but can't be reflected for some reason.
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.. versionadded:: 1.2
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"""
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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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ismulti = None
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def __init__(
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self,
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message,
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statement,
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params,
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orig,
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hide_parameters=False,
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code=None,
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ismulti=None,
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):
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SQLAlchemyError.__init__(self, message, code=code)
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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.ismulti = ismulti
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self.hide_parameters = hide_parameters
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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 (
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self.__class__,
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(
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self.args[0],
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self.statement,
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self.params,
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self.orig,
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self.hide_parameters,
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self.ismulti,
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),
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)
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def _sql_message(self, as_unicode):
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from sqlalchemy.sql import util
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details = [self._message(as_unicode=as_unicode)]
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if self.statement:
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if not as_unicode and not compat.py3k:
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stmt_detail = "[SQL: %s]" % compat.safe_bytestring(
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self.statement
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)
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else:
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stmt_detail = "[SQL: %s]" % self.statement
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details.append(stmt_detail)
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if self.params:
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if self.hide_parameters:
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details.append(
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"[SQL parameters hidden due to hide_parameters=True]"
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)
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else:
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params_repr = util._repr_params(
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self.params, 10, ismulti=self.ismulti
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)
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details.append("[parameters: %r]" % params_repr)
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code_str = self._code_str()
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if code_str:
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details.append(code_str)
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return "\n".join(["(%s)" % det for det in self.detail] + details)
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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
|
||
|
|
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.
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
code = "dbapi"
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def instance(
|
||
|
|
cls,
|
||
|
|
statement,
|
||
|
|
params,
|
||
|
|
orig,
|
||
|
|
dbapi_base_err,
|
||
|
|
hide_parameters=False,
|
||
|
|
connection_invalidated=False,
|
||
|
|
dialect=None,
|
||
|
|
ismulti=None,
|
||
|
|
):
|
||
|
|
# Don't ever wrap these, just return them directly as if
|
||
|
|
# DBAPIError didn't exist.
|
||
|
|
if (
|
||
|
|
isinstance(orig, BaseException) and not isinstance(orig, Exception)
|
||
|
|
) or isinstance(orig, DontWrapMixin):
|
||
|
|
return orig
|
||
|
|
|
||
|
|
if orig is not None:
|
||
|
|
# not a DBAPI error, statement is present.
|
||
|
|
# raise a StatementError
|
||
|
|
if isinstance(orig, SQLAlchemyError) and statement:
|
||
|
|
return StatementError(
|
||
|
|
"(%s.%s) %s"
|
||
|
|
% (
|
||
|
|
orig.__class__.__module__,
|
||
|
|
orig.__class__.__name__,
|
||
|
|
orig.args[0],
|
||
|
|
),
|
||
|
|
statement,
|
||
|
|
params,
|
||
|
|
orig,
|
||
|
|
hide_parameters=hide_parameters,
|
||
|
|
code=orig.code,
|
||
|
|
ismulti=ismulti,
|
||
|
|
)
|
||
|
|
elif not isinstance(orig, dbapi_base_err) and statement:
|
||
|
|
return StatementError(
|
||
|
|
"(%s.%s) %s"
|
||
|
|
% (
|
||
|
|
orig.__class__.__module__,
|
||
|
|
orig.__class__.__name__,
|
||
|
|
orig,
|
||
|
|
),
|
||
|
|
statement,
|
||
|
|
params,
|
||
|
|
orig,
|
||
|
|
hide_parameters=hide_parameters,
|
||
|
|
ismulti=ismulti,
|
||
|
|
)
|
||
|
|
|
||
|
|
glob = globals()
|
||
|
|
for super_ in orig.__class__.__mro__:
|
||
|
|
name = super_.__name__
|
||
|
|
if dialect:
|
||
|
|
name = dialect.dbapi_exception_translation_map.get(
|
||
|
|
name, name
|
||
|
|
)
|
||
|
|
if name in glob and issubclass(glob[name], DBAPIError):
|
||
|
|
cls = glob[name]
|
||
|
|
break
|
||
|
|
|
||
|
|
return cls(
|
||
|
|
statement,
|
||
|
|
params,
|
||
|
|
orig,
|
||
|
|
connection_invalidated=connection_invalidated,
|
||
|
|
hide_parameters=hide_parameters,
|
||
|
|
code=cls.code,
|
||
|
|
ismulti=ismulti,
|
||
|
|
)
|
||
|
|
|
||
|
|
def __reduce__(self):
|
||
|
|
return (
|
||
|
|
self.__class__,
|
||
|
|
(
|
||
|
|
self.statement,
|
||
|
|
self.params,
|
||
|
|
self.orig,
|
||
|
|
self.hide_parameters,
|
||
|
|
self.connection_invalidated,
|
||
|
|
self.ismulti,
|
||
|
|
),
|
||
|
|
)
|
||
|
|
|
||
|
|
def __init__(
|
||
|
|
self,
|
||
|
|
statement,
|
||
|
|
params,
|
||
|
|
orig,
|
||
|
|
hide_parameters=False,
|
||
|
|
connection_invalidated=False,
|
||
|
|
code=None,
|
||
|
|
ismulti=None,
|
||
|
|
):
|
||
|
|
try:
|
||
|
|
text = str(orig)
|
||
|
|
except Exception as e:
|
||
|
|
text = "Error in str() of DB-API-generated exception: " + str(e)
|
||
|
|
StatementError.__init__(
|
||
|
|
self,
|
||
|
|
"(%s.%s) %s"
|
||
|
|
% (orig.__class__.__module__, orig.__class__.__name__, text),
|
||
|
|
statement,
|
||
|
|
params,
|
||
|
|
orig,
|
||
|
|
hide_parameters,
|
||
|
|
code=code,
|
||
|
|
ismulti=ismulti,
|
||
|
|
)
|
||
|
|
self.connection_invalidated = connection_invalidated
|
||
|
|
|
||
|
|
|
||
|
|
class InterfaceError(DBAPIError):
|
||
|
|
"""Wraps a DB-API InterfaceError."""
|
||
|
|
|
||
|
|
code = "rvf5"
|
||
|
|
|
||
|
|
|
||
|
|
class DatabaseError(DBAPIError):
|
||
|
|
"""Wraps a DB-API DatabaseError."""
|
||
|
|
|
||
|
|
code = "4xp6"
|
||
|
|
|
||
|
|
|
||
|
|
class DataError(DatabaseError):
|
||
|
|
"""Wraps a DB-API DataError."""
|
||
|
|
|
||
|
|
code = "9h9h"
|
||
|
|
|
||
|
|
|
||
|
|
class OperationalError(DatabaseError):
|
||
|
|
"""Wraps a DB-API OperationalError."""
|
||
|
|
|
||
|
|
code = "e3q8"
|
||
|
|
|
||
|
|
|
||
|
|
class IntegrityError(DatabaseError):
|
||
|
|
"""Wraps a DB-API IntegrityError."""
|
||
|
|
|
||
|
|
code = "gkpj"
|
||
|
|
|
||
|
|
|
||
|
|
class InternalError(DatabaseError):
|
||
|
|
"""Wraps a DB-API InternalError."""
|
||
|
|
|
||
|
|
code = "2j85"
|
||
|
|
|
||
|
|
|
||
|
|
class ProgrammingError(DatabaseError):
|
||
|
|
"""Wraps a DB-API ProgrammingError."""
|
||
|
|
|
||
|
|
code = "f405"
|
||
|
|
|
||
|
|
|
||
|
|
class NotSupportedError(DatabaseError):
|
||
|
|
"""Wraps a DB-API NotSupportedError."""
|
||
|
|
|
||
|
|
code = "tw8g"
|
||
|
|
|
||
|
|
|
||
|
|
# 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."""
|