public List<Map<String,Object>> query(){
  try {
    return Db.query(prep.executeQuery());
  }
 catch (  SQLException e) {
    throw convert(e);
  }
}

public List < Map < String , Object > > query ( ) { try { return Db . query ( prep . executeQuery ( ) ) ; } catch ( SQLException e ) { throw convert ( e ) ; } }
execute the prepared query .
