php用mysqli模块连数据库Fatal error: Call to a member function query() 。解决思路

程序员文章站 2022-06-17 12:37:44

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php用mysqli模块连数据库Fatal error: Call to a member function query() 。。。。
出现了这个错误：Fatal error: Call to a member function query() on a non-object in D:\wamp\www\bills\model\UserDB.class.php on line 24
代码如下：

PHP code

mysqli=new mysqli($dbhost,$dbuser,$dbpwd,$dbname);            if(mysqli_connect_errno())            {                echo "物品数据库连接失败！";            }        }        public function close()        {            if($this->mysqli)                $this->mysqli->close();            $this->mysqli=FALSE;        }        public function _destruct()        {            $this->close();        }    }    class UserDB extends Database    {        public function queryUserByName($name)        {            $query="SELECT * FROM Users WHERE name='".$name."'";            if ($result=$this->mysqli->query($query))  //此处提示出错！！                return true;            else                 return false;        }

然后在另一个页面里调用上面的类对象：

PHP code

queryUserByName($lvalue["name"]);            echo "alert";            if($rtmp)  //这个名字没有注册            {                $rusers=new User($lvalue);                if($udb->addUser($rusers))                {                    setcookie("start",0);                    setcookie("userInfo",serialize($rusers));                    setcookie("username",$rusers->name);                    header("Location:../view/index.php");                }                else                     header("Location:../view/errors.php?value=tianjia");            }            break;       }

------解决方案--------------------
public function __construct($configFile="config.inc.php") //两个下划线

php用mysqli模块连数据库Fatal error: Call to a member function query() 。解决思路

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