Noah Hart <n...@lipmantpa.com> wrote: > Number 2, your platform may not support the sqlite3_create_collation > interface. For example, Firefox now includes SQLite. Unfortunately, > while Firefox supports user defined functions, their implementation > does not support user defined collations. > > Someone commented that the US lives in a 7-bit world. > This means that the other 6 billion people on the planet do not. > > This creates a real problem for me. I am writing a foreign language > Firefox extension, and the issue of sorting is critical, since > Firefox uses Unicode sorting, which does not "sort" (based on my > rules) correctly. This means I have no way to correct the sorting, > except in the display routines.
This is not quite true. You say custom functions are supported: then you can do ORDER BY sortkey(textField), with a suitably defined sortkey() function (see strxfrm, LCMapString). You can't however build indexes using such a function, something you can do with a collation. > That being said, I would not limit this feature to 8bit locales. A > more general solution would be to design it around a sqlite_collation > master table in the database. An application developer (not the > SQLite team) would be responsible to define and populate their "user > defined" collation. Sorting in many locales is not as simple as suitably ordering individual Unicode characters. E.g. in German phonebook order, letter ö (small o with umlaut aka diaresis) sorts as if it were two letters oe, that is od < ö < of. In French, strings are compared ignoring diacritics first, then ties are broken by considering diacritics right-to-left. In Spanish traditional sort, a pair ch sorts as if it were a single letter between c and d. Even in English, you would often want to sort co-op and coop, or cant and can't, in such a way that they are kept together. Consider also things like combinig diacritics. Igor Tandetnik
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