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const char *sqlite3_db_filename(sqlite3 *db, const char *zDbName);
R-41554-07046:[The sqlite3_db_filename(D,N) interface returns a pointer to a filename associated with database N of connection D. ] R-53691-30751:[The main database file has the name "main". ] 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.
R-41640-10889:[The filename returned by this function is the output of the xFullPathname method of the VFS. ] R-42868-39706:[In other words, the filename will be an absolute pathname, even if the filename used to open the database originally was a URI or relative pathname. ]