Tom Lane ee28cacf61 Extend the abilities of libpq's target_session_attrs parameter. ... In addition to the existing options of "any" and "read-write", we now support "read-only", "primary", "standby", and "prefer-standby". "read-write" retains its previous meaning of "transactions are read-write by default", and "read-only" inverts that. The other three modes test specifically for hot-standby status, which is not quite the same thing. (Setting default_transaction_read_only on a primary server renders it read-only to this logic, but not a standby.) Furthermore, if talking to a v14 or later server, no extra network round trip is needed to detect the session's status; the GUC_REPORT variables delivered by the server are enough. When talking to an older server, a SHOW or SELECT query is issued to detect session read-only-ness or server hot-standby state, as needed. Haribabu Kommi, Greg Nancarrow, Vignesh C, Tom Lane; reviewed at various times by Laurenz Albe, Takayuki Tsunakawa, Peter Smith. Discussion: https://postgr.es/m/CAF3+xM+8-ztOkaV9gHiJ3wfgENTq97QcjXQt+rbFQ6F7oNzt9A@mail.gmail.com		2021-03-02 20:17:48 -05:00
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sgml	Extend the abilities of libpq's target_session_attrs parameter.	2021-03-02 20:17:48 -05:00
Makefile	Remove maintainer-check target, fold into normal build	2013-10-10 20:11:56 -04:00