基础模型类

代码展示

数据库操作类

<?php
class MyPDO
{
    private static $instance;  //保存对象
    private $host;      //主机地址
    private $dbname;    //数据库名字
    private $port;      //端口
    private $user;      //用户名
    private $pwd;       //密码
    private $charset;   //字符集
    private $link;      //连接对象


    private function __construct($data){

        $this->initParam($data);
        $this->getPDO();
        $this->errorMode();
    }

    private function __clone(){

    }

    //获取单例
    public static function getInstance($data=array()){
        if(!self::$instance instanceof self){
            return self::$instance=new self($data);
        }
        return self::$instance;
    }

    //初始化参数
    private function initParam($data){
        $this->host=isset($data['host'])?$data['host']:'localhost'; 
        $this->dbname=isset($data['dbname'])?$data['dbname']:'my_db';
        $this->port=isset($data['port'])?$data['port'] : '3306';
        $this->user=isset($data['user'])?$data['user']:'root';
        $this->pwd=isset($data['pwd'])?$data['pwd']:'root';
        $this->charset=isset($data['charset'])?$data['charset']:'utf8';
    }

    //显示错误
    private function showError($e,$sql=null){
        echo "错误信息".$e->getMessage()."<br>";
        echo "错误代码".$e->getCode()."<br>";
        echo "错误文件".$e->getFile()."<br>";
        echo "错误行号".$e->getLine().'<br>';
        if($sql!=null){
            echo "错误sql语句".$sql;
        }
    }
    //连接数据库
    private function getPDO(){
        try {
            $this->link= new PDO("mysql:host={$this->host};port={$this->port};dbname={$this->dbname};charset={$this->charset}","{$this->user}","{$this->pwd}");
        } catch (PDOException $e) {
           $this->showError($e);
            exit;
        }
    }

    //设置错误模式
    private function errorMode(){
        $this->link->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
    }

    

    /**
     * 增删改功能
     * @param string sql语句
     * @return int 受影响的行数
     */
    public function exec($sql){
        try {
            return $row=$this->link->exec($sql);
        } catch (PDOException $e) {
            $this->showError($e,$sql);
            exit;
        }

    }

    /**
     * 获取二维数组结果集
     * @param string sql
     * @return PDOStatement 结果集
     */

     public function fetchAll($sql){
         try{
            $stmt=$this->link->query($sql);
            return $stmt->fetchAll();

         }catch(PDOException $e){
            $this->showError($e,$sql);
         }

     }

     /**
      * 获取一维数组结果集
      *@param string sql
      *@return PDOStatement 结果集
      */
      public function fetch($sql){
          try {
            $stmt= $this->link->query($sql);
            return $stmt->fetch();
          } catch (PDOException $e) {
              $this->showError($e,$sql);
          }

      }

      /**
       * 获取单行单列
       * @param string sql
       * @return mixed 内容
       */
      public  function fetchColumn($sql){
          try {
            $stmt=$this->link->query($sql);
            return $stmt->fetchColumn();
          } catch (PDOException $e) {
              $this->showError($e,$sql);
          }
      }

      //转账事务操作
      public function beginTransction($sql_out,$sql_in){
         try {
                $this->link->beginTransaction();
                $out=$this->link->exec($sql_out);
                $in=$this->link->exec($sql_in);
                if($out && $in){
                    $this->link->commit();
                    echo "转账成功";
                }else{
                    $this->link->rollBack();
                }
         } catch (PDOException $e) {
             $this->showError($e);
         }
      }

}

Mybank模型类

<?php
//加载Model基础模型类
require './Model.class.php';
//转账模型类，有多么功能就封装什么方法就行
class Mybank extends Moudel
{
    //基础模型类中 已经继承到方法直接用就行
      //定义转账方法
      public function zhuanZ($out,$in,$money){
          //这里的$this->pdo 就是父类基础模型下的pdo
        return $this->pdo->beginTransction("update my_bank set money=money-$money where carNo=$out","update my_bank set money=money+$money where carNo=$in");
    }
}

基础模型类  所有模型类的父类

<?php

    /**
     * 基础模型类，其他模型类继承此类
     * 所有模型类的父类
     */
    class Moudel
    {
        //定义存储pdo对象的属性，要求在子类中可以被访问；
        protected $pdo;
        //构造方法，当子类继承的时候，直接就初始化pdo的对象
        public function __construct(){

            //初始化pdo
            $this->initPDO();
        }

        //初始化pdo对象
        protected function initPDO(){
            //加载MyPDO类
            require './MyPDO.class.php';
            $this->pdo=MyPDO::getInstance();
        }
      
    }

Controller 控制器

<?php 
    //控制器调用视图 view.html
    require 'index.html';

    //调用Model 模型类;
    require './Mybank.class.php';
    if(!empty($_GET)){
        $out=$_GET['out'];
        $in=$_GET['in'];
        $money=$_GET['money'];
        //实例化 Mybank 模型类，闭并调用下面的转账方法
        $ban=new Mybank();
        echo $ban->zhuanZ($out,$in,$money);
       
    }

View 视图

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="" method="get">
        转出卡号：<input type="text" name="out" id=""><br>
        转入卡号：<input type="text" name="in" id=""><br>
        金额：<input type="text" name="money" id=""><br>
        <input type="submit" value="转账">
    </form>
</body>
</html>