php数据库操作model类(使用__call方法)

本文实例讲述了php数据库操作model类。分享给大家供大家参考，具体如下：该数据库操作类

本文实例讲述了php数据库操作model类。分享给大家供大家参考，具体如下：

该数据库操作类使用__call()方法实现了数据的查找功能。

代码如下：

<?php
/*
作者 : shyhero
*/
define("HOSTNAME","127.0.0.1");
define("USERNAME","root");
define("PASSWORD","");
define("DATANAME","class");
class Model{
 private $link;
 private $tableName;
 private $zd;
 private $method = array(
 "where" => "",
 "order" => "",
 "limit" => "",
 "group" => "",
 "having" => ""
 );
 public function __construct($tableName){
 $this -> tableName = $tableName;
 try{
 $this -> link = mysqli_connect(HOSTNAME,USERNAME,PASSWORD,DATANAME);
 mysqli_set_charset($this -> link,"UTF8");
 }catch(Exception $e){
 echo "数据库连接失败";
 }
 $this -> desc();
 }
 public function __destruct(){
 mysqli_close($this -> link);
 }
 public function desc(){
 $sql = " desc {$this -> tableName}; ";
 $res = mysqli_query($this -> link,$sql);
 $arr = mysqli_fetch_all($res,MYSQLI_ASSOC);
 for($i = 0 ;$i < count($arr);$i++){
 $brr[] = $arr[$i]['Field'];
 }
 $this -> zd = $brr;
 return $brr;
 }
 public function __call($name,$value){
 $name = strtolower($name);
 if(array_key_exists($name,$this -> method)){
 if($name == 'order'){
 $this -> method['order'] = " order by ".$value[0];
 }elseif($name == 'group'){
 $this -> method['group'] = " group by ".$value[0];
 }else{
 $this -> method[$name] = " {$name} ".$value[0];
 }
 }else{
 return "the method is not found!";
 }
 return $this;
 }
 public function method(){
 return " {$this -> method['where']} {$this -> method['order']} {$this -> method['limit']} {$this -> method['group']} {$this -> method['having']}; ";
 }
 public function find($a="*"){
 if(in_array("{$a}",$this -> zd) || $a == "*"){
 $sql = "select {$a} from {$this -> tableName} {$this -> method()} ";
 }else{
 $sql = "select * from {$this -> tableName}";
 }
 //return $sql;
 $res = mysqli_query($this -> link,$sql);
 $arr = mysqli_fetch_all($res,MYSQLI_ASSOC);
 return $arr;
 }
}

用法示例：

<?php
 function __autoload($className){
 require($className.".class.php");
 }
 $a = new Model("stu");
 $a -> where("name = 'zhu'")->limit("5,10");
 var_dump($a -> find("name"));