本文實例為大家分享了java網上圖書商城Category模塊代碼,供大家參考,具體內容如下
sql
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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; |
Dao
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public List<Category> findAll() throws SQLException { /* * 1. 查詢出所有一級分類 */ 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. 循環遍歷所有的一級分類,為每個一級分類加載它的二級分類 */ for (Category parent : parents) { // 查詢出當前父分類的所有子分類 List<Category> children = findByParent(parent.getCid()); // 設置給父分類 parent.setChildren(children); } return parents; } |
left.jsp
Q6MenuBar組件顯示手風琴式下拉菜單
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<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> |
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持服務器之家。