PHP implements database operation Model class

This article mainly introduces the simple database operation Model class implemented by PHP. It analyzes the definition and usage skills of PHP database operation model class in the form of examples, including basic addition, deletion, modification and query functions of the database. Friends in need can refer to the following

This database model class can realize the addition, deletion, modification and query of the database and simplify the database operation.

1. config.php code:

<?php
 define("HOSTNAME","127.0.0.1");
 define("USERNAME","root");
 define("PASSWORD","");
 define("DATANAME","class");

2. Usage code:

<?php
 /*
  作者：shyhero
  */
 require("./config.php");
 class Model{
  private $link;
  //构造函数，初始化数据库连接
  public function __construct(){
   $this -> link = mysqli_connect(HOSTNAME,USERNAME,PASSWORD,DATANAME) or die("数据库连接失败");
   mysqli_set_charset($this -> link,"utf8");
  }
  //查找 1.表名 2.条件 3.值 如果不添加条件或者值，就全部查询
  public function find($table="",$key="",$value=""){
   if(!$key||!$value){
    $sql = "select * from {$table}";
   }else{
    $sql = "select * from {$table} where {$key} = &#39;{$value}&#39;";
   }
   $res = mysqli_query($this -> link,$sql);
   $arr = mysqli_fetch_all($res,MYSQLI_ASSOC);
   mysqli_free_result($res);
   return $arr;
  }
  //增加 1.表名 2.需要插入的字段 3.值1
  public function ins($table="",$zd="name,score",$value=""){
   $arr = explode(",",$value);
   $str = "";
   foreach($arr as $k => $v){
    $str .= "&#39;".$v."&#39;".",";
   }
   $str = rtrim($str,",");
   $sql = "insert into {$table}({$zd})values({$str})";
   $res = mysqli_query($this -> link,$sql);
   return mysqli_insert_id($this -> link);
  }
  //修改 1.表名 2.修改字段 3.值 4.条件 5.值
  public function upd($table="",$key="",$value="",$key2="",$value2=""){
   $sql = "update {$table} set {$key}=&#39;{$value}&#39; where {$key2}=&#39;{$value2}&#39;";
   $res = mysqli_query($this -> link,$sql);
   return mysqli_affected_rows($this -> link);
  }
  //删除 1.表名 2.条件 3.值
  public function del($table="",$key="",$value=""){
   $sql = "delete from {$table} where {$key}=&#39;{$value}&#39;";
   $res = mysqli_query($this -> link,$sql);
   return mysqli_affected_rows($this -> link);
  }
  //析构函数
  public function __destruct(){
   if(isset($res))
    mysqli_free_result($res);
   mysqli_close($this -> link);
  }
 }
 $m = new Model();
 //var_dump($m -> find("stu","id"));
 var_dump($m -> ins("stu","name","zhu"));
 //var_dump($m -> upd("stu","name","dujianing","id","1"));
 //var_dump($m -> del("stu","name","li"));
?>

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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