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Improve dblink error message when remote does not provide it

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When dblink or postgres_fdw detects an error on the remote side of the
connection, it will try to construct a local error message as best it
can using libpq's PQresultErrorField(). When no primary message is
available, it was bailing out with an unhelpful "unknown error". Make
that message better and more style guide compliant. Per discussion
on hackers.

Backpatch to 9.2 except postgres_fdw which didn't exist before 9.3.

Discussion: https://postgr.es/m/19872.1482338965%40sss.pgh.pa.us
This commit is contained in:
Joe Conway
2016-12-21 15:48:15 -08:00
parent d5633af7b6
commit 28c9b6be7f
2 changed files with 2 additions and 2 deletions
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2
contrib/postgres_fdw/connection.c
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@ -495,7 +495,7 @@ pgfdw_report_error(int elevel, PGresult *res, PGconn *conn,
ereport(elevel,
(errcode(sqlstate),
message_primary ? errmsg_internal("%s", message_primary) :
errmsg("unknown error"),
errmsg("could not obtain message string for remote error"),
message_detail ? errdetail_internal("%s", message_detail) : 0,
message_hint ? errhint("%s", message_hint) : 0,
message_context ? errcontext("%s", message_context) : 0,