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renumbering of encoding IDs done between 8.2 and 8.3 turns out to break 8.2 initdb and psql if they are run with an 8.3beta1 libpq.so. For the moment we can rearrange the order of enum pg_enc to keep the same number for everything except PG_JOHAB, which isn't a problem since there are no direct references to it in the 8.2 programs anyway. (This does force initdb unfortunately.) Going forward, we want to fix things so that encoding IDs can be changed without an ABI break, and this commit includes the changes needed to allow libpq's encoding IDs to be treated as fully independent of the backend's. The main issue is that libpq clients should not include pg_wchar.h or otherwise assume they know the specific values of libpq's encoding IDs, since they might encounter version skew between pg_wchar.h and the libpq.so they are using. To fix, have libpq officially export functions needed for encoding name<=>ID conversion and validity checking; it was doing this anyway unofficially. It's still the case that we can't renumber backend encoding IDs until the next bump in libpq's major version number, since doing so will break the 8.2-era client programs. However the code is now prepared to avoid this type of problem in future. Note that initdb is no longer a libpq client: we just pull in the two source files we need directly. The patch also fixes a few places that were being sloppy about checking for an unrecognized encoding name.
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. PostgreSQL has many language interfaces including some of the more common listed below: C++ - http://thaiopensource.org/development/libpqxx/ JDBC - http://jdbc.postgresql.org ODBC - http://odbc.postgresql.org Perl - http://search.cpan.org/~dbdpg/ PHP - http://www.php.net Python - http://www.initd.org/ Ruby - http://ruby.scripting.ca/postgres/ Other language binding are available from a variety of contributing parties. PostgreSQL also has a great number of procedural languages available, a short but not complete list is below: PL/pgSQL - included in PostgreSQL source distribution PL/Perl - included in PostgreSQL source distribution PL/PHP - http://projects.commandprompt.com/projects/public/plphp PL/Python - included in PostgreSQL source distribution PL/Java - http://gborg.postgresql.org/project/pljava/projdisplay.php PL/Tcl - included in PostgreSQL source distribution See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.