本文实例为大家分享了java网上图书商城Category模块代码，供大家参考，具体内容如下
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;
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Dao
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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;
}
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left.jsp
Q6MenuBar组件显示手风琴式下拉菜单
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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>
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。