if sqldb, err := dbConnector.GetDBConn(); sqldb != nil || err != nil {
			return sqldb, err
		}
	}

	if sqldb, ok := connPool.(*sql.DB); ok && sqldb != nil {
		return sqldb, nil
	}

	return nil, ErrInvalidDB
}

func (db *DB) getInstance() *DB {
	if db.clone > 0 {
		tx := &DB{Config: db.Config, Error: db.Error}

		if db.clone == 1 {
			// clone with new statement
			tx.Statement = &Statement{