PHP实现基于mysqli的Model基类完整实例 mysql model文件怎么用 mysql workbench model mysql model 与schema区

set_charset('utf8');
       return $_mysqli;
     }
     //清理，释放资源
     static public function unDB(&$_result, &$_db) {
       if (is_object($_result)) {
          $_result->free();
          $_result = null;
       }
       if (is_object($_db)) {
          $_db->close();
          $_db = null;
       }
     }
  }
?>

multi_query($_sql);
       DB::unDB($_result = null, $_db);
       return true;
     }
     //获取下一个增值id模型
     public function nextid($_table) {
       $_sql = "SHOW TABLE STATUS LIKE '$_table'";
       $_object = $this->one($_sql);
       return $_object->Auto_increment;
     }
     //查找总记录模型
     protected function total($_sql) {
       $_db = DB::getDB();
       $_result = $_db->query($_sql);
       $_total = $_result->fetch_row();
       DB::unDB($_result, $_db);
       return $_total[0];
     }
     //查找单个数据模型
     protected function one($_sql) {
       $_db = DB::getDB();
       $_result = $_db->query($_sql);
       $_objects = $_result->fetch_object();
       DB::unDB($_result, $_db);
       return Tool::htmlString($_objects);
     }
     //查找多个数据模型
    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);
     }
     //增删修模型
     protected function aud($_sql) {
       $_db = DB::getDB();
       $_db->query($_sql);
       $_affected_rows = $_db->affected_rows;
       DB::unDB($_result = null, $_db);
       return $_affected_rows;
     }
  }
?>