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如何取数据库里的值

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Release: 2016-06-13 12:04:01
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怎么取数据库里的值?
数据库如下。cate1是大类。每个大类下又有小类。


怎么查找才能得到以下结果
id      cate1                        
1       Protect                               Phone Case        Table Protection      Power Bank Protection
2       Power                                Power Bank          Car Charger           Wall Charger
3      Keyboard&Mouse            Keyboard               Mouse
4       Headphone                      Headphone           Earphone                Bluetooth Headphone
5      Bluetooth_Speaker        Power Bank           Car Charger             Wall Charger

用sql语句怎么实现?在php中怎么实现?
每个大类下,跟着他的小类作为一条数据,建个新表。


------解决方案--------------------

<br />$sqlstr = "select * from table where id<6";<br />$query = mysql_query($sqlstr) or die(mysql_error());<br />while($thread=mysql_fetch_array($query)){<br />    $result[] = $thread;<br />}<br />print_r($result);<br />
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------解决方案--------------------
建议一开始建立表结构的时候考虑下无限级分类;然后把你这个表好好优化下那样获取就更好了。
------解决方案--------------------
select cate1, group_concat(cate2) as cate2 from tbl_name where cate2!='' group by cate1 order by id
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<br />    cate1                    cate2 <br />Protect   		Power Bank Protectio,Table Protection,Phone Case <br />Power Wall		Charger,Car Charger,Power Bank <br />Keyboard&Mouse	Mouse,Keyboard <br />Headphone     	Bluetooth Headphone,Earphone,Headphone <br />Bluetooth_Speaker Wall Charger,Car Charger,Power Bank <br />
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------解决方案--------------------

引用:
无限级分类要怎么做,该怎么优化?
cate2中的数据怎么提取成单个的结果,以逗号为界。


可以去php基础 已解决模块 有xu老大,专门讲解无限极分类
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