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

public List < Map < String , Object > > query ( String sql ) { try { return query ( stat . executeQuery ( sql ) ) ; } catch ( SQLException e ) { throw convert ( e ) ; } }
execute a sql statement .
