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php實(shí)現(xiàn)的簡(jiǎn)單數(shù)據(jù)庫(kù)操作Model類

更新時(shí)間：2016年11月16日 11:55:09 作者：shyhero

這篇文章主要介紹了php實(shí)現(xiàn)的簡(jiǎn)單數(shù)據(jù)庫(kù)操作Model類,結(jié)合實(shí)例形式分析了php數(shù)據(jù)庫(kù)操作模型類的定義與使用技巧,包括數(shù)據(jù)庫(kù)的基本增刪改查等功能,需要的朋友可以參考下

本文實(shí)例講述了php實(shí)現(xiàn)的簡(jiǎn)單數(shù)據(jù)庫(kù)操作Model類。分享給大家供大家參考，具體如下：

該數(shù)據(jù)庫(kù)模型類可實(shí)現(xiàn)數(shù)據(jù)庫(kù)的增刪改查，簡(jiǎn)化數(shù)據(jù)庫(kù)操作。

1. config.php代碼：

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

2. 使用代碼：

<?php
 /*
  作者：shyhero
  */
 require("./config.php");
 class Model{
  private $link;
  //構(gòu)造函數(shù)，初始化數(shù)據(jù)庫(kù)連接
  public function __construct(){
   $this -> link = mysqli_connect(HOSTNAME,USERNAME,PASSWORD,DATANAME) or die("數(shù)據(jù)庫(kù)連接失敗");
   mysqli_set_charset($this -> link,"utf8");
  }
  //查找 1.表名 2.條件 3.值 如果不添加條件或者值，就全部查詢
  public function find($table="",$key="",$value=""){
   if(!$key||!$value){
    $sql = "select * from {$table}";
   }else{
    $sql = "select * from {$table} where {$key} = '{$value}'";
   }
   $res = mysqli_query($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){
    $str .= "'".$v."'".",";
   }
   $str = rtrim($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.條件 5.值
  public function upd($table="",$key="",$value="",$key2="",$value2=""){
   $sql = "update {$table} set {$key}='{$value}' where {$key2}='{$value2}'";
   $res = mysqli_query($this -> link,$sql);
   return mysqli_affected_rows($this -> link);
  }
  //刪除 1.表名 2.條件 3.值
  public function del($table="",$key="",$value=""){
   $sql = "delete from {$table} where {$key}='{$value}'";
   $res = mysqli_query($this -> link,$sql);
   return mysqli_affected_rows($this -> link);
  }
  //析構(gòu)函數(shù)
  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"));
?>

希望本文所述對(duì)大家PHP程序設(shè)計(jì)有所幫助。

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