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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 |
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