? ?此次做項(xiàng)目使用JDBC，遇到了一個(gè)樹(shù)形結(jié)構(gòu)，采用遞歸查找父類，有了一個(gè)初步的認(rèn)識(shí)。

?

public?Channel?findParent(int?id){?

????????if?(id==0)?{?

????????????return?null;?

????????}else?{?

????????int?parent?=?1;?

????????????Channel?c=new?Channel();?

????????????String?sql="select?*?from?channel?where?id=?";?

????????????conn=DBConnection.getConnection();?

????????????try?{?

????????????????ps=conn.prepareStatement(sql);?

????????????????ps.setInt(1,?id);?

????????????????rs=ps.executeQuery();?

????????????????while?(rs.next())?{?

????parent=rs.getInt("parent");?????????c.setChannelName(rs.getString("channelName"));?

?

????????????????}?

????????????????rs.close();?

????????????????ps.close();?

????????????????conn.close();?

????????????????if?(parent!=0)?{???

• 1.????????????c.setChaparent(findParent(parent));?

????????????????}?

????????????}?catch?(SQLException?e)?{?

????????????????e.printStackTrace();?

????????????}?

?

????????????return?c;?

?

????????}?

?

????}?

先說(shuō)遞歸的執(zhí)行順序：類似于攔截器，if (parent!=0)則一直執(zhí)行1.以前的語(yǔ)句 else 執(zhí)行1.以后的語(yǔ)句。并且執(zhí)行順序是1 2 3 。3 2 1

轉(zhuǎn)載于:https://blog.51cto.com/4215825/1107493

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