列名无效的问题！

海的童话 2010-10-20 01:19:43

public List getPlatformList(String pf){
String sql="select t4.deviceid,t4.devicetype,t4.devicename,t4.stationid,t4.xpoint,t4.ypoint,t4.platform,t5.downlinkid as downlinkids from t_platform_topo t4 left join (select t1.deviceid,t2.downlinkid from t_platform_topo t1 , t_node_display t2 ,t_station t3 "+
"where t1.stationid=t3.stationid and t2.station=t3.stationname and instr(t2.nodename,t1.devicename)>0 and t1.platform ='"+pf+"' and t1.devicetype=3) t5 on "+
"t4.deviceid = t5.deviceid where t4.platform='"+pf+"'";
return getJdbcTemplate().query(sql, new PlatformTopoMapper());
}

class PlatformTopoMapper implements RowMapper{

public Object mapRow(ResultSet rowSet, int rowNum) throws SQLException {
final PlatformTopoBO bo = new PlatformTopoBO();
bo.setDeviceid(rowSet.getLong("deviceid"));
bo.setDevicename(rowSet.getString("devicename"));
bo.setDevicetype(rowSet.getInt("devicetype"));
bo.setPlatform(rowSet.getString("platform"));
bo.setStationid(rowSet.getInt("stationid"));
bo.setXpoint(rowSet.getInt("xpoint"));
bo.setYpoint(rowSet.getInt("ypoint"));
bo.setDownlinkid(rowSet.getString("downlinkids")); return bo;
}

}

红色部分就是发出报错的地方！数据库查没有问题可能因为这个t5不是一个实际意义的表所以不能识别downlinkid 请高手指教下！

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海的童话 2010-10-20

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问题解决了是因为有别的方法调用了PlatformTopoMapper 而downlinkids列在另外的结果集中没有

singlesteven 2010-10-20

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 public List<Card> queryCardByname(String sname) {

        Connection con = null;

        PreparedStatement ps = null;

        ResultSet rs = null;

        List<Card> list = new ArrayList<Card>();

        String sql = "select * from card where sname =?";

        con = db.getConnection();

        try {

            // System.out.println("!!!!!:"+rs.isClosed());

            ps = con.prepareStatement(sql);

            ps.setString(1, sname);

            rs = ps.executeQuery();

            while (rs.next()) {

                Card cd = new Card();

                cd.setSname(StringUtil.repairNull(rs.getString("Sname")));

                cd.setCardfbid(StringUtil.repairNull(rs.getString("Cardfbid")));

                list.add(cd);

            }

        } catch (SQLException ex) {

            ex.printStackTrace();

        } finally {

            this.close(ps, rs, con);

        }



        return list;

    }