php框架开发四(DAO层)
网站开发不可避免地要对一些数据进行储存,但是存储这些数据各种语言的方式基本上都是:先打开连接,然后执行SQL语句,获取结结果,关闭连接。
那么PHP在操作数据库的时候有哪些方法呢?
[php]
$connect = mysql_connect($host,$user,$pass);
mysql_select_db($dbname);
$result = mysql_query($query);
while($row = (mysql_fetch_array($result))){
print_r($row);
}
用以上操作可以来操作数据库。对于在HTML嵌入PHP脚本的行业,这已经足够了,但是当我们要进行大量的增删改查时,必须要把多次的上面的脚本进行复用。那么就会出现这样的模式
DAO层http://blog.csdn.net/tomyjohn/article/details/7675770
我们暂且把上面的模式就做DAO层,但是真正的意义在于我们这个MVC框架,恰好可以用这个方式来操作。下面我们新建一个controller
[php]
class index{
public function demo(){
$art = new article();
$art->title = '标题';
$art->content = '内容';
$art->save();
echo $art->id;
view::show('index.htm');
}
}
在数据库里新建一张表,表名为“si_article”,
[sql]
DROP TABLE IF EXISTS `si_article`;
CREATE TABLE `si_article` (
`id` int(8) NOT NULL AUTO_INCREMENT,
`title` varchar(255) DEFAULT NULL,
`content` text,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=gbk;
在“modules”文件夹内新建一个“article.php”
[php]
class article extends dao{
protected $table = __CLASS__;
}
当我们执行上面的controller时,便可以看到刚插入的数据的ID。
这样我们可以很简单地实现一个在线留言的功能。
这个框架讲到现在,差不多所有的MVC都已经描述了一遍,你可以用它来开发,当然它是一个完整的但并不丰富的MVC。我们要考虑的事情还有很多。譬如分页,缓存,安全等等。但这并不影响我对这个轮子的热爱。

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