1. PDO ?? ??????? ????? ?? MysqlPdo.class.php ??? ?????.

???? ??? ??? ????.

<?php
class MysqlPdo{
    private $dbConfig=array(
        'db'=>'mysql',
        'host'=>'localhost',
        'port'=>'3306',
        'user'=>'root',
        'pwd'=>'',
        'charset'=>'utf8',
        'dbname'=>''
    );
    private static $instance;  //單例模式
    private $db;   //PDO實(shí)例
    private $data=array(); //操作數(shù)據(jù)
    private function __construct($params)
    {
        $this->dbConfig=array_merge($this->dbConfig,$params);
        $this->connect();
    }
    //連接服務(wù)器
    private function connect(){
        //mysql:host=localhost
        //mysql:host:localhost;port=3306;dbname=php;charset=utf-8
        $dsn="{$this->dbConfig['db']}:host={$this->dbConfig['host']};port={$this->dbConfig['port']};dbname={$this->dbConfig['dbname']};charset={$this->dbConfig['charset']}}";
        try{
            //實(shí)例化PDO
            $this->db=new PDO($dsn,$this->dbConfig['user'],$this->dbConfig['pwd']);
        }catch (PDOException $exception){
            die("數(shù)據(jù)庫(kù)連接失敗");
        }
    }
    public static function getInstance($params=array()){
        if(!self::$instance instanceof self){
            self::$instance=new self($params);
        }
        return self::$instance; //返回對(duì)象
    }
    //私有化克隆,防止外部調(diào)用clone $對(duì)象 生成新的對(duì)象,因?yàn)槭菃卫Ｊ?    private function __clone()
    {
        // TODO: Implement __clone() method.
    }
    //通過(guò)預(yù)處理方式執(zhí)行sql
    public function query($sql,$batch=false){
        $data=$batch?$this->data:array($this->data);
        $this->data=array();
        //通過(guò)預(yù)處理方式執(zhí)行SQL
        $stmt=$this->db->prepare($sql);
        foreach($data as $v){
            if($stmt->execute($v)===false){
                die("數(shù)據(jù)庫(kù)PDO預(yù)處理操作失敗");
            }
        }
        return $stmt;
    }
    public function data($data){
        $this->data=$data;
        return $this; //返回對(duì)象自身用于連貫操作
    }
    //取得一行結(jié)果
    public function fetchRow($sql){
        return $this->query($sql)->fetch(PDO::FETCH_ASSOC);//返回索引數(shù)組
    }
    //取得多行結(jié)果
    public function fetchAll($sql){
        return $this->query($sql)->fetchAll(PDO::FETCH_ASSOC);
    }
}

1 ? ??? ???? ??? ??? ???? ?? ??? ??????. ?? ??? ???? ?????? ??? ??? ?? ? ???? ?????? ?? ???? ?????.

2. GetInstance()? ?????? ?? ??? ??? ??? ????? ???. getInstance? ?????? ?? ??? ?????. ??? ?????? ? ???? ???? ???? ???? ?????? ?? ??? ?? ??? ????? ?? ??????? ?? ?? ??? ??????. ??????? ????? ?? ??? ???? ???

3, ???? ?? SQL ? ??

4, ??? ?? ??

5, ?? ?? ?? ??

??? ?????? ???? ??????