PDO封装增删改查

Posted 2022-04-17 maohongli

<?php
class  db

    public  $table=null;
    public  $pdo;
    public  $where=null;    //where 条件
    public   $field=null;  //要查询的条件

  public  function  __construct()
  
       $this->pdo=new PDO("mysql:host=127.0.0.1;dbname=1611b","root","root");
  

    public  function  fetch()
       return  $this->pdo->query("select * from $this->table $this->where")->fetch(PDO::FETCH_ASSOC);

  

    public  function   table($table)
        $this->table=$table;
        return $this;
  

  public function  where($where)
      $str="where ";
      foreach ($where as $k=>$v)
          $str.=$k."="."‘".$v."‘". " and " ;
      
      $this->where=rtrim($str," and ");
     return  $this;
  


  public   function  insert($data)
      $k=array_keys($data);
      $k=implode($k,‘,‘);
      $str="";
      foreach ($data as $key=>$value)
          $str.=","."‘".$value."‘";
      
      $str=substr($str,1);
    return     $this->pdo->exec("insert into $this->table ($k) values ($str)");


  


  public   function   delect($id)
      $str=‘‘;
      $str1=‘‘;
      foreach ($id as $k=>$v)
          $str.=$k;
          foreach ($v as $kk=>$vv)
              $str1.=‘,‘.$vv;
          
      

      $str2=substr($str1,1);

      $ids=‘where ‘.$str.‘ in ‘.‘(‘.$str2.‘)‘;
      return $this->pdo->exec("delete from $this->table $ids");
  



    function update($res)
        //修改
        $str=‘‘;
        foreach ($res as $k=>$v)
            $str.=‘,‘.$k.‘=‘."‘".$v."‘";
        
        $str=substr($str,1);
        return  $this->pdo->exec("update $this->table set $str $this->where");