Hello devs,
I'm looking at psql's use of PQexec for implementing some feature.
When running with multiple SQL commands, the doc is not very helpful.
From the source code I gathered that PQexec returns the first COPY results
if any, and if not the last non-empty results, unless all is empty in
which case an empty result is returned. So * marks the returned result
in the following examples:
INSERT ... \; * COPY ... \; SELECT ... \; \;
SELECT ... \; UPDATE ... \; * SELECT ... \; \;
\; \; * ;
The attached patch tries to improve the documentation based on my
understanding.
IMVHO, psql's code is kind of a mess to work around this strange behavior,
as there is a loop over results within PQexec, then another one after
PQexec if there were some COPY.
--
Fabien.
