//所有版块@$row_fid = "SELECT * FROM `forum_forum` ORDER BY `displayorder` ASC";$stmt = $pdo->prepare($row_fid);$stmt->execute();$row_forum = $stmt->fetchAll(PDO::FETCH_ASSOC); //主题分类 foreach ($row_forum as $key => $value) { $fid = $value["fid"]; @$sql = "SELECT `typeid`,`name` FROM `forum_topic_type` WHERE `fid` = $fid"; $stmt = $pdo->prepare($sql); $stmt->execute(); $row_type = $stmt->fetchAll(PDO::FETCH_ASSOC); } print_r($row_type);$smarty -> assign("all_forum",$row_forum);
代码是给各位看现在的逻辑 但没成功
学会SMARTY时间不长
有两张表
forum_forum 是讨论版块ID 主要是`name`, `fid`
forum_topic_type 是讨论版块的主题分类ID 主要是`typeid`, `name`, `fid`
本来
我是先把
forum_forum 列出所有版块,然后加到smarty的assign
成功在前台的所有版块列表中,显示出来
但想在版块名称的下方,把此讨论版块的旗下所有「主题分类」都循环出来,
但发现,这些东西(这张表forum_forum )已在前台循环了, 我无法取得fid 来循环 相关的主题分类,因为循环结果的ID已经在模板中才能取得
所以想了想...在smarty的assign之前,试试foreach一下有什么结果,
然后试试看能不能合并成同一个组数再assign,发觉有点不行
所以想请教一下各位前辈
己想过的解决方法
1. 合并多表查询,但是主题分类也不只一个...所以就放弃这方法
2. 做个smarty 插件,已试了,但是也是卡住了不能前进
其实SMARTY这卖二次循环问题已困扰很久,但好像不能再逃避,虚心请教,希望彻底了解这类问题
求指教!
回复讨论(解决方案)
另外也补充问个问题
我用SMARTY自己做 modifier.xxx.php 这类插件时,平时是常想顺利的
但为什么一用到数据库就完全不行?
我是用PDO的
因为没把$pdo这类句柄传入? 但是这种插件是由 模板直接调用,我根本就不能加入$pdo
我也试过加插件的function 内引入数据库文件,但也是表示数据库操作有误
请问有什么解决方案吗? 还是插件这部分根本不能操作数据库???
哪一步没成功?$row_type没值吗?
1.通过模板处理:类表 关联 子类表 得出结果集,在进行smarty的assign,模板循环2次 。
2.通过程序查询结果集处理:返回结果集,在程序组装成为字符串,直接assign传到模板。
//所有版块@$row_fid = "SELECT * FROM `forum_forum` ORDER BY `displayorder` ASC";$stmt = $pdo->prepare($row_fid);$stmt->execute();$row_forum = $stmt->fetchAll(PDO::FETCH_ASSOC); //主题分类 foreach ($row_forum as $key => $value) { $fid = $value["fid"]; @$sql = "SELECT `typeid`,`name` FROM `forum_topic_type` WHERE `fid` = $fid"; $stmt = $pdo->prepare($sql); $stmt->execute(); $row_forum[$key]['list'] = $stmt->fetchAll(PDO::FETCH_ASSOC); } print_r($row_forum);$smarty -> assign("all_forum",$row_forum);
大哥,谢谢你
就这意思
太感谢了,学到了
果然是逻辑问题
以后看来能解决大部分的二次循环问题了
谢谢

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PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

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