sqliteBtreeOpen
int sqliteBtreeOpen(const char *zFilename, int mode, int nPg, Btree **ppBtree);
return sqliteBtreeOpen(0, omitJournal, nCache, ppBtree);
return sqliteBtreeOpen(zFilename, omitJournal, nCache, ppBtree);
return sqliteBtreeOpen(zFilename, omitJournal, nCache, ppBtree);