text: # Copyright (C) 2005, 2006, 2007, 2008, 2009 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
  :class:`~sqlalchemy.exc.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"""
  
  class IdentifierError(SQLAlchemyError):
      """Raised when a schema name is beyond the max character limit"""
  
  # 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 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."""
  
  class NoReferencedColumnError(NoReferenceError):
      """Raised by ``ForeignKey`` when the referred ``Column`` 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):
          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)))
  
  
  # 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."""
  