old_contents: import testbase
  from testlib import testing
  schema = None
  
  __all__ = 'Table', 'Column',
  
  table_options = {}
  
  def Table(*args, **kw):
      """A schema.Table wrapper/hook for dialect-specific tweaks."""
  
      global schema
      if schema is None:
          from sqlalchemy import schema
  
      test_opts = dict([(k,kw.pop(k)) for k in kw.keys()
                        if k.startswith('test_')])
  
      kw.update(table_options)
  
      if testbase.db.name == 'mysql':
          if 'mysql_engine' not in kw and 'mysql_type' not in kw:
              if 'test_needs_fk' in test_opts or 'test_needs_acid' in test_opts:
                  kw['mysql_engine'] = 'InnoDB'
  
      # Apply some default cascading rules for self-referential foreign keys.
      # MySQL InnoDB has some issues around seleting self-refs too.
      if testing.against('firebird'):
          table_name = args[0]
          unpack = (testing.config.db.dialect.
                    identifier_preparer.unformat_identifiers)
  
          # Only going after ForeignKeys in Columns.  May need to
          # expand to ForeignKeyConstraint too.
          fks = [fk
                 for col in args if isinstance(col, schema.Column)
                 for fk in col.args if isinstance(fk, schema.ForeignKey)]
  
          for fk in fks:
              # root around in raw spec
              ref = fk._colspec
              if isinstance(ref, schema.Column):
                  name = ref.table.name
              else:
                  name = unpack(ref)[-2]
              print name, table_name
              if name == table_name:
                  if fk.ondelete is None:
                      fk.ondelete = 'CASCADE'
                  if fk.onupdate is None:
                      fk.onupdate = 'CASCADE'
  
      return schema.Table(*args, **kw)
  
  def Column(*args, **kw):
      """A schema.Column wrapper/hook for dialect-specific tweaks."""
  
      global schema
      if schema is None:
          from sqlalchemy import schema
  
      # TODO: a Column that creates a Sequence automatically for PK columns,
      # which would help Oracle tests
      return schema.Column(*args, **kw)
  
new_contents: import testbase
  from testlib import testing
  schema = None
  
  __all__ = 'Table', 'Column',
  
  table_options = {}
  
  def Table(*args, **kw):
      """A schema.Table wrapper/hook for dialect-specific tweaks."""
  
      global schema
      if schema is None:
          from sqlalchemy import schema
  
      test_opts = dict([(k,kw.pop(k)) for k in kw.keys()
                        if k.startswith('test_')])
  
      kw.update(table_options)
  
      if testbase.db.name == 'mysql':
          if 'mysql_engine' not in kw and 'mysql_type' not in kw:
              if 'test_needs_fk' in test_opts or 'test_needs_acid' in test_opts:
                  kw['mysql_engine'] = 'InnoDB'
  
      # Apply some default cascading rules for self-referential foreign keys.
      # MySQL InnoDB has some issues around seleting self-refs too.
      if testing.against('firebird'):
          table_name = args[0]
          unpack = (testing.config.db.dialect.
                    identifier_preparer.unformat_identifiers)
  
          # Only going after ForeignKeys in Columns.  May need to
          # expand to ForeignKeyConstraint too.
          fks = [fk
                 for col in args if isinstance(col, schema.Column)
                 for fk in col.args if isinstance(fk, schema.ForeignKey)]
  
          for fk in fks:
              # root around in raw spec
              ref = fk._colspec
              if isinstance(ref, schema.Column):
                  name = ref.table.name
              else:
                  # take just the table name: on FB there cannot be
                  # a schema, so the first element is always the
                  # table name, possibly followed by the field name
                  name = unpack(ref)[0]
              print name, table_name
              if name == table_name:
                  if fk.ondelete is None:
                      fk.ondelete = 'CASCADE'
                  if fk.onupdate is None:
                      fk.onupdate = 'CASCADE'
  
      return schema.Table(*args, **kw)
  
  def Column(*args, **kw):
      """A schema.Column wrapper/hook for dialect-specific tweaks."""
  
      global schema
      if schema is None:
          from sqlalchemy import schema
  
      # TODO: a Column that creates a Sequence automatically for PK columns,
      # which would help Oracle tests
      return schema.Column(*args, **kw)
  
subject: Fix the unpacking of the refered table name under Firebird This fixes a little glitch introduced in [3959], in case of "implicit FKs" (that is, {{{ForeignKey("orders")}}}, where the field(s) is missing).