After some discussions about what could be useful since psql scripts now
accepts tests, this patch sets a few variables which can be used by psql
after a "front door" (i.e. actually typed by the user) query:
- RESULT_STATUS: the status of the query
- ERROR: whether the query failed
- ERROR_MESSAGE: ...
- ROW_COUNT: #rows affected
SELECT * FROM ;
\if :ERROR
\echo oops
\q
\endif
I'm not sure that the names are right. Maybe STATUS would be better than
RESULT_STATUS.
--
Fabien.
