<?php
  //數(shù)據(jù)庫連接類
  class DB {
     //獲取對象句柄
     static public function getDB() {
       $_mysqli = new mysqli(DB_HOST,DB_USER,DB_PASS,DB_NAME);
       if (mysqli_connect_errno()) {
          echo '數(shù)據(jù)庫連接錯誤！錯誤代碼：'.mysqli_connect_error();
          exit();
       }
       $_mysqli->set_charset('utf8');
       return $_mysqli;
     }
     //清理，釋放資源
     static public function unDB(&$_result, &$_db) {
       if (is_object($_result)) {
          $_result->free();
          $_result = null;
       }
       if (is_object($_db)) {
          $_db->close();
          $_db = null;
       }
     }
  }
?>

Model.class.php

<?php
  //模型基類
  class Model {
     //執(zhí)行多條SQL語句
     public function multi($_sql) {
       $_db = DB::getDB();
       $_db->multi_query($_sql);
       DB::unDB($_result = null, $_db);
       return true;
     }
     //獲取下一個增值id模型
     public function nextid($_table) {
       $_sql = "SHOW TABLE STATUS LIKE '$_table'";
       $_object = $this->one($_sql);
       return $_object->Auto_increment;
     }
     //查找總記錄模型
     protected function total($_sql) {
       $_db = DB::getDB();
       $_result = $_db->query($_sql);
       $_total = $_result->fetch_row();
       DB::unDB($_result, $_db);
       return $_total[0];
     }
     //查找單個數(shù)據(jù)模型
     protected function one($_sql) {
       $_db = DB::getDB();
       $_result = $_db->query($_sql);
       $_objects = $_result->fetch_object();
       DB::unDB($_result, $_db);
       return Tool::htmlString($_objects);
     }
     //查找多個數(shù)據(jù)模型
    protected function all($_sql) {
       $_db = DB::getDB();
       $_result = $_db->query($_sql);
       $_html = array();
       while (!!$_objects = $_result->fetch_object()) {
          $_html[] = $_objects;
       }
       DB::unDB($_result, $_db);
       return Tool::htmlString($_html);
     }
     //增刪修模型
     protected function aud($_sql) {
       $_db = DB::getDB();
       $_db->query($_sql);
       $_affected_rows = $_db->affected_rows;
       DB::unDB($_result = null, $_db);
       return $_affected_rows;
     }
  }
?>