java网上图书商城（2）Category模块

CREATE TABLE `t_category` ( `cid` char(32) NOT NULL, `cname` varchar(50) DEFAULT NULL, `pid` char(32) DEFAULT NULL, `desc` varchar(100) DEFAULT NULL, `orderBy` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`cid`), UNIQUE KEY `cname` (`cname`), KEY `FK_t_category_t_category` (`pid`), KEY `orderBy` (`orderBy`), CONSTRAINT `FK_t_category_t_category` FOREIGN KEY (`pid`) REFERENCES `t_category` (`cid`)) ENGINE=InnoDB AUTO_INCREMENT=48 DEFAULT CHARSET=utf8;　

public List<Category> findAll() throws SQLException { /*  * 1. 查询出所有一级分类  */ String sql = "select * from t_category where pid is null order by orderBy"; List<Map<String,Object>> mapList = qr.query(sql, new MapListHandler());   List<Category> parents = toCategoryList(mapList);   /*  * 2. 循环遍历所有的一级分类，为每个一级分类加载它的二级分类  */ for(Category parent : parents) {  // 查询出当前父分类的所有子分类  List<Category> children = findByParent(parent.getCid());  // 设置给父分类  parent.setChildren(children); } return parents;}

<script language="javascript">$(function() {....<c:forEach items="${parents}" var="parent"> <c:forEach items="${parent.children}" var="child"> bar.add("${parent.cname}", "${child.cname}", "/goods/BookServlet?method=findByCategory&cid=${child.cid}", "body"); </c:forEach></c:forEach> });</script>