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f17e8f33f7
When reporting connection errors, we might show a database name in the message that's not the one we actually tried to connect to, if the database was taken from libpq defaults instead of from user parameters. Fix such error messages to use PQdb(), which reports the correct name. (But, per commit 2930c05634bc, make sure not to try to print NULL.) Apply to branches 9.5 through 13. Branch master has already been changed differently by commit 58cd8dca3de0. Reported-by: Robert Haas <robertmhaas@gmail.com> Discussion: https://postgr.es/m/CA+TgmobssJ6rS22dspWnu-oDxXevGmhMD8VcRBjmj-b9UDqRjw@mail.gmail.com
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.