On 6/27/07, Jiri Hajek <[EMAIL PROTECTED]> wrote:
Actually, reading one of the links you posted (http://blogs.msdn.com/michkap/archive/2005/05/04/414520.aspx - everybody please read it before continuing in discussion), I got (what I think is a great) idea: Let's include version information about collation algorithm we are using. So, extending my previous suggestion, the SQLite collation title would look like 'en_AU_Win_2_1', where the individual parts mean: 'en_AU' - obviously a sort order 'Win' - that we are basing the ordering on default Windows methods (otherwise could be e.g. 'ICU') '2_1' - version string as retrieved from GetNLSVersion() function and NLSVERSIONINFO struct (see the link above for details).
I don't see how that is different than the previous difficulty of having incompatible databases between systems. The only new thing is we can check it, but the database will have inconsistent behaviour anyway.
This way we are absolutely sure that we don't corrupt SQLite database. While I'm working on a single system, the version string wouldn't change. Then, e.g. if I open SQLite database with 'en_AU_Win_2_1' collation on a system NLSVERSIONINFO returns version 2.3, I know I have to reindex, change collation title to 'en_AU_Win_2_3' and then can safely use the database.
Trevor proposed method doesn't need that, because the collation data goes with the database (which is the big advantage to me). And if you want to use another collation, you only need to import the collation data needed for that locale.
It seems to me to be a really cross-platform solution and what's best - without any coding on SQLite side necessary (even though possible to handle some parts of this proposal internally).
On the articles you have pointed (but I don't have a link right now) also states that SQL Server and the Jet engine don't use the system collation functions, but instead have their own integrated collation system (based on the Windows one, off course) exactly for the same reason. For small databases, the task of re-indexing is not big, but you are forgetting you can have a database in a shared network folder, used by PC's in different parts of the world and even different OSs (with samba/cifs). That's why I like Trevor's idea so much. Best regards, ~Nuno Lucas
Jiri
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