diff options
Diffstat (limited to 'lib/sqlalchemy/sql/expression.py')
| -rw-r--r-- | lib/sqlalchemy/sql/expression.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py index 2e5797b34..ee867a2f9 100644 --- a/lib/sqlalchemy/sql/expression.py +++ b/lib/sqlalchemy/sql/expression.py @@ -1002,7 +1002,13 @@ class ClauseElement(object): e = self.bind if e is None: - raise exceptions.InvalidRequestError("This Compiled object is not bound to any Engine or Connection.") + label = getattr(self, 'description', self.__class__.__name__) + msg = ('This %s is not bound to an Engine or Connection. ' + 'Execution can not proceed without a database to execute ' + 'against. Either execute with an explicit connection or ' + 'bind the MetaData of the underlying tables to enable ' + 'implicit execution.') % label + raise exceptions.UnboundExecutionError(msg) return e.execute_clauseelement(self, multiparams, params) def scalar(self, *multiparams, **params): |