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Tom Lane 4576208454 Force standard_conforming_strings to always be ON. 
Continuing to support this backwards-compatibility feature has
nontrivial costs; in particular it is potentially a security hazard
if an application somehow gets confused about which setting the
server is using.  We changed the default to ON fifteen years ago,
which seems like enough time for applications to have adapted.
Let's remove support for the legacy string syntax.

We should not remove the GUC altogether, since client-side code will
still test it, pg_dump scripts will attempt to set it to ON, etc.
Instead, just prevent it from being set to OFF.  There is precedent
for this approach (see commit de66987ad).

This patch does remove the related GUC escape_string_warning, however.
That setting does nothing when standard_conforming_strings is on,
so it's now useless.  We could leave it in place as a do-nothing
setting to avoid breaking clients that still set it, if there are any.
But it seems likely that any such client is also trying to turn off
standard_conforming_strings, so it'll need work anyway.

The client-side changes in this patch are pretty minimal, because even
though we are dropping the server's support, most of our clients still
need to be able to talk to older server versions.  We could remove
dead client code only once we disclaim compatibility with pre-v19
servers, which is surely years away.  One change of note is that
pg_dump/pg_dumpall now set standard_conforming_strings = on in their
source session, rather than accepting the source server's default.
This ensures that literals in view definitions and such will be
printed in a way that's acceptable to v19+.  In particular,
pg_upgrade will work transparently even if the source installation has
standard_conforming_strings = off.  (However, pg_restore will behave
the same as before if given an archive file containing
standard_conforming_strings = off.  Such an archive will not be safely
restorable into v19+, but we shouldn't break the ability to extract
valid data from it for use with an older server.)

Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/3279216.1767072538@sss.pgh.pa.us
2026-01-21 15:08:38 -05:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Update copyright for 2026 2026-01-01 13:24:10 -05:00
contrib Force standard_conforming_strings to always be ON. 2026-01-21 15:08:38 -05:00
doc Force standard_conforming_strings to always be ON. 2026-01-21 15:08:38 -05:00
src Force standard_conforming_strings to always be ON. 2026-01-21 15:08:38 -05:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml ci: Configure g++ with 32-bit for 32-bit build 2026-01-09 08:58:50 +01:00
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.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
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README.md

PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.