两个有关联的表的循环有关问题
两个有关联的表的循环问题
我现在有两个数据库表
课程表subject
id subjectname
1 语文
2 数学
3 英语
班级所选课程表classsubject
id classid(班级表id) subjectid(课程表id)
1 1 1
2 1 2
3 1 1
我需要实现页面先以复选框的形式显示出课程表的的所有课程
然后,根据班级id,查询出相对应的课程id,相应的课程复选框就成为选中的状态
如果班级id为1
则页面显示如下
- HTML code
<!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --> <input type="checkbox" name="subject[]" value="1" checked>语文 <input type="checkbox" name="subject[]" value="2" checked>数学 <input type="checkbox" name="subject[]" value="3">英语
应该怎么实现,前辈们给看看啊
------解决方案--------------------
- SQL code
SELECT s.*, c.subjectid FROM subject AS s LEFT JOIN classsubject AS c ON s.id=c.subjectid AND c.classid=1 <br><font color="#e78608">------解决方案--------------------</font><br>用1楼查询找出班级所有已选课程数组,然后查询出所有课程数组,2个foreach循环嵌套(可能还有其他更好的办法)就能给所有课程数组标记出哪些是已选的,然后循环输出,已选标记的checked就可以了。 <div class="clear"> </div>

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