- #Sqlite order by string case insensitive how to
- #Sqlite order by string case insensitive update
- #Sqlite order by string case insensitive android
- #Sqlite order by string case insensitive code
How should I write a SQLite query so it searches for strings in a database that match strings in a string array?. Strange behaviour for simple string table in sqlite. sqlite-net - ordering by string Case Insensitive Accent Insensitive. Yet, for a German you have to consider them equal. Do you expect L"ß" = L"ss" ? They're not even the same length. With this done, you can basically write your own ordering by converting strings to lowercase and comparing them. However, using wchar_t means you now choose locales that do not use UTF-8 for const char*. It supposedly is so wide that you don't have to deal with multi-byte encodings, but your collation will still depend on locale (LC_COLLATE). Wchar_t is not the standard solution either. #Sqlite order by string case insensitive code
Their multi-byte code only handles characters up to 2 bytes UTF-8 needs 3) (As I understand it, Microsoft's CRT suffers from this. And if you have NO locale in which const char* is UTF-8, you can't use this trick at all. This of course influences the sort order, which is locale dependent. So you HAVE to pick a locale whose multi-byte encoding is UTF-8, for the mbscmp function to work. But neither the C nor the C++ standard defines such a locale check with your vendor (too many embedded vendors, sorry, no genearl answer here). They're perfectly valid multi-byte char* strings, if you have an appropriate locale. UTF-8 strings add extra complexity to the question. "i" is uppercased to "İ" (U+130 Latin Capital I with dot above) The simple counter-example is "i" "I" ? The naive answer is no, but in Turkish these strings are unequal. There is no locale-independent, case-insensitive way of sorting strings. What you really want is logically impossible. This is printed: strcasecmp('Äaa', 'äaa') = -32Īnd yes, I am aware about ICU, but we can't use it on the embedded platform due to its enormous size. The results are unspecified in other locales.Īnd, indeed, the result of strcasecmp does not change between locales on Linux with GLIBC. In the POSIX locale, strcasecmp() and strncasecmp() do upper to lower conversions, then a byte comparison. I tried to use a POSIX strcasecmp, but it seems to be not defined for locales other than "POSIX" (Are there case-insensitive versions of these?) strcoll with C locales and std::collate/ std::collate_byname are case-sensitive.
Options include using standard C or C++ library or a small (suitable for embedded system) and non-GPL (suitable for a proprietary system) third-party library. However I won't be holding my breath, as far as I know, collation is very language-dependent, so anything that works on languages other than English will do, even if it means switching locales. The method should ideally be locale-independent. I am looking for a method to compare and sort UTF-8 strings in C++ in a case-insensitive manner to use it in a custom collation function in SQLite. Export database from SQLitestudio to SQL format. #Sqlite order by string case insensitive android
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#Sqlite order by string case insensitive how to
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