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diff --git a/lib/sqlalchemy/exc.py b/lib/sqlalchemy/exc.py
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+# exceptions.py - exceptions for SQLAlchemy
+# Copyright (C) 2005, 2006, 2007, 2008 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
+[sqlalchemy.exceptions#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"""
+
+
+# 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 NoReferencedTableError(InvalidRequestError):
+    """Raised by ``ForeignKey`` when the referred ``Table`` 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."""