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We used to convert the unicode object directly to a string in the server encoding by calling Python's PyUnicode_AsEncodedString function. In other words, we used Python's routines to do the encoding. However, that has a few problems. First of all, it required keeping a mapping table of Python encoding names and PostgreSQL encodings. But the real killer was that Python doesn't support EUC_TW and MULE_INTERNAL encodings at all. Instead, convert the Python unicode object to UTF-8, and use PostgreSQL's encoding conversion functions to convert from UTF-8 to server encoding. We were already doing the same in the other direction in PLyUnicode_FromString, so this is more consistent, too. Note: This makes SQL_ASCII to behave more leniently. We used to map SQL_ASCII to Python's 'ascii', which on Python means strict 7-bit ASCII only, so you got an error if the python string contained anything but pure ASCII. You no longer get an error; you get the UTF-8 representation of the string instead. Backpatch to 9.0, where these conversions were introduced. Jan Urbański
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, many of which are listed here: http://www.postgresql.org/download 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/.