点击一个分门别类，把当前分类及其所有子分类的所有产品列出来
点击一个分类，把当前分类及其所有子分类的所有产品列出来
上面是分类表，产品表就是 关联 分类表的 cate_id ,确定产品所属的分类
现在我想要的效果是 点击一个分类，把当前分类及其所有子分类的所有产品列出来
请大神指教
想的头都破了，递归？还是？怎么弄呢？
------解决方案--------------------
点击了分类，于是就知道了分类号
查询数据库，凡是父类号为这个分类号的就是他的子分类了
------解决方案--------------------
不知道你数据量大不大
小企业站的话，得到父分类ID后，查到所有子分类ID，然后合并到一起：2,5,6,7,8这种
再到产品表sql语句用in关键字查出来，怎么用，搜一下吧...
不清楚in能不能用到索引？
如果数据量比较大，就用冗余换效率
给分类表加一个floor字段，父分类就写0,1级子分类就写1，2级子分类写2。。。
假设你有3层分类，那么在产品表加3个字段，cate，cate1，cate2
产品属于哪个子分类，就把从父到2级子 3个字段都填满
筛选时根据传入的cateid，先查出这个分类的floor，然后查出他的所有上级分类id
剩下就是把所有得到的id作为条件筛选了
这里有个关键，要建一个BTREE索引，以cate到cateN的顺序都包括进来
同数据量方法2要快很多，但他的缺点是子分类移动时还要改产品表
------解决方案--------------------
这个简单。就一直查询下去。
由主分类ID查询出子分类，又从子分类ID查询出第三级，又从第三级ID查询出第四级……
当然，你的服务器能经得起这样折腾才行。
不管你是不是无限级，都是这样的查询。没有捷径可走。
------解决方案--------------------
他有一个cate_path字段啊，不需要这样的。
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