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ThinkPHP php 框架学习笔记_php技巧

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May 17, 2016 am 09:30 AM

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花了两个多钟在看 ThinkPHP 框架，不想太过深入的知道它的所有高深理论。单纯想知道怎么可以用起来，可以快捷的搭建一个网站。所以是有选择的看，二个钟后还是一头雾水。于是决定改变学习策略，上官方论坛看其它高人写的民间教程，果然比官方的通俗易懂多了。http://bbs.thinkphp.cn/forumdisplay.php?fid=6 (官方论坛)

　　ThinkPHP 有很多函数通过参数拼凑的方式来组合SQL，如下：$list = $test->findall('',$fields,'id desc',$p->firstRow.','.$p->listRows);虽然这样的拼凑的方式简化了我们 sql 语句，但这也要求我们要记住很多函数方法，我并不想去记太多这样的东西，觉得有时还不如直接写一条完整的 sql 来得简单。不知ThinkPHP里有没有直接写 sql 后执行select 查询的函数方法？后来得知 Model.class.php 里面有一个方法 public function query($sql) 可以达到我想要的要求！在做分页时就是用query方法跳过了使用 findall 方法实现了分页功能。

　　看了例子和教程都是对单表操作的，可很多情况下我们要用到多表联合操作。如多表联合查询，这个时候又应该怎样做呢？ThinkPHP 已经考虑到这个问题，已经很贴心的帮我们安排了关联查询和关联操作。这些我都嫌弃过于麻烦！其实灵活运用这个框架里面的一些基本的函数方法，就可以达到关联查询和关联操作。没必要记忆一大堆乱七八糟的东西。

　　数据分页是经常要用到的一项功能，ＴＰ这方面做得还算挺简单。在网上找了一个教程（ http://bbs.phpchina.com/thread-52813-1-1.html ），本以为参考这个教程写出一个ＴＰ分页程序应该很简单的事。没想到还是颇费了一番周折！

　　　① 一开始是遇到 Fatal error: Class 'Think' not found in….. 的错误提示，在网上找了一通才知道是缺少了一个扩展类库。后来在官方网站下载了相应的文件。

　　　② 扩展类库有了，没提示错误了，可还是不能正确显示出想要的结果！查看“页面Trace信息”，原来是SQL有问题 SELECT COUNT() AS tp_count FROM `think_demo` LIMIT 1，分析得出教程的这句$count = $test->count('','id') 代码有问题,改成 $count = $test->count('id') 终于看到上一页下一页的超链接了。尽信书不如无书！

　　　③ 用教程的 $list = $test->findall('',$fields,'id desc',$p->firstRow.','.$p->listRows); 这句代码我怎么也得不到想要的结果，我也不想去深入了解 findall 方法的各个参数的使用方法。于是改成 $list = $test->query("select $fields from think_demo order by id desc limit $p->firstRow,$p->listRows") 。再运行，这次终于把分页搞掂出来了！

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