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"));
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希望本文所述对大家PHP程序设计有所帮助。