Hi,
https://www.sqlite.org/c3ref/db_filename.html:
> If there is no attached database N on the database connection D, or if
database N is a temporary or in-memory database, then a NULL pointer is
returned.
However, when called for :memory: db the function actually returns "".
Looking at the code:
/*
** Return the full pathname of the database file.
**
** Except, if the pager is in-memory only, then return an empty string if
** nullIfMemDb is true. This routine is called with nullIfMemDb==1 when
** used to report the filename to the user, for compatibility with legacy
** behavior. But when the Btree needs to know the filename for matching to
** shared cache, it uses nullIfMemDb==0 so that in-memory databases can
** participate in shared-cache.
*/
SQLITE_PRIVATE const char *sqlite3PagerFilename(Pager *pPager, int
nullIfMemDb){
return (nullIfMemDb && pPager->memDb) ? "" : pPager->zFilename;
}
- as the comment says, it returns an empty string in case of in-memory mode
(although "nullIfMemDb" confusingly implies null).
I have no idea who is correct here - the code or the documentation - but
one of them should probably be corrected?
Thanks.
--
Best regards,
Alex
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