php框架练习

框架的作用：

功能：操作数据库 模版引擎smarty

分析，应该具备什么功能？

a:具体配置文件 ，配置文件的读取功能
b:数据库处理类
c:目录结构

先建一个includes文件放入，配置文件(config.php)，配置类(conf.class.php)，mysql数据库处理类(mysql.class.php)，网站初始化文件(init.php)

config.php  文件：

//网站的配置文件

$_cfg=array();

$_cfg['host']='localhost';
$_cfg['user']='root';
$_cfg['pwd']='root';
$_cfg['db']='xxzdb';
$_cfg['char']='utf8';
//$_cfg['']='';
//$_cfg['']='';

conf.class.php

//配置文件的读取类
//作用：读取config.php 并能返回某个配置选项的值
class Conf{
	private static $ins = false;
	private $info = array();

	final protected function __construct(){
		require(ROOT .'includes/config.php');
		$this->info = $_cfg;
	} 

	//单例
	public static function getIns(){
		if(self::$ins === false){
			self::$ins = new self();

		}
		return self::$ins;

	}

	//读取配置文件的信息
	public function __get($key){
		if(array_key_exists($key,$this->info)){
		return $this->info[$key];
		} else {
		return null;
		}
	}

	public function __set($key,$value){
		$this->info[$key] = $value;

	}
	//测试方法
	public function printc(){

		print_r($this->info);
	}
}

//调用
/*
$conf = Conf::getIns();

$conf->template_dir='d:/www';
echo $conf->printc();
*/

mysql.class.php

//require('conf.class.php');
//数据库的处理类

//抽象类 没有方法体
abstract class abs_db{
	abstract protected function connect();
	abstract protected function select_db($dbname='');
	abstract protected function setChar();
	abstract protected function	query($sql);
	abstract protected function	getAll($sql);
	abstract protected function	getRow($sql);
	abstract protected function getOne($sql);
	abstract protected function error();
}	

class Mysql extends abs_db{
	private static $ins = false;
	private $conn = false;
	private $conf = false;

	protected function __construct(){

		$this->conf = Conf::getIns();
	    $this->connect();
		$this->select_db();
		$this->setChar();
	}

	public static function getIns(){
		if(self::$ins === false){
			self::$ins= new self();
		}
		return self::$ins;
	}

	//创建连接
	protected function connect(){
		$this->conn = mysql_connect($this->conf->host,$this->conf->user,$this->conf->pwd);
		if(!$this->conn){
			$err = new Exception('连接失败');
			throw $err;
		}
	}

	//选择数据库
	protected function select_db($dbname=''){
		if($dbname == ''){
			$sql='use '.$this->conf->db;
			$this->query($sql);
		}
	}

	//设置字符集
	protected function setChar(){
		$sql='set names '.$this->conf->char;
		$this->query($sql);
	}

	//执行sql语句
	public function query($sql){
		return mysql_query($sql,$this->conn);
	}

	//取回所有行
	public function getAll($sql){
		$rs = $this->query($sql);

		$list=array();
		while($row = mysql_fetch_assoc($rs)){
			$list[] = $row;
		}
		return $list;
	}

	//取回一行
	public function getRow($sql){
		$rs = $this->query($sql);
		return mysql_fetch_assoc($rs);
	}

	public function getOne($sql){

	}

	public function error(){
		print_r(mysql_error($this->conn));
	}

	//关闭资源
	public function __destruct(){
	}
}
/*
$db = Mysql::getIns();

print_r($db);
$sql="select * from art limit 5";
print_r($db->getAll($sql));
*/

init.php

//网站的初始化文件
/**

魔术方法
__FILE__ 当前绝对路径

文件作用：
负责当前网站的根目录
引入所以页面都需要的文件

*/

//ROOT 代表网站的跟路径
define('ROOT',str_replace('\\','/',str_replace('includes\init.php','',__FILE__)));

require(ROOT .'includes/conf.class.php');
require(ROOT .'includes/mysql.class.php');
//echo ROOT;