Re: psql - add special variable to reflect the last query status

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.

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