Question

遵循以下示例...

    public function insert($model,$brand,$price){
        mysql_query("INSERT INTO autos (model, brand, price) VALUES ($model,'$brand', $price)",$this->link);} 

$conexion-> insert(05,"Ford",50000000);

...我做了修改/更新代码：

public function modify($model,$brand,$price,$newbrand,$newprice){
            mysql_query("UPDATE 'crautos'.'autos' SET 'brand' = '$newbrand',
'price' = '$newprice' WHERE 'autos'.'model' =5 AND 'autos'.'brand' = '$brand' AND 'autos'.'price' ='$price' LIMIT 1) VALUES ($newbrand, $newprice)",$this->link);}

$conexion-> modify("Mitsubishi", 40000000);

但它不起作用，这是错误输出：

警告：缺少MyDataBase :: modify（）的参数3，在on中调用第15行警告：缺少MyDataBase :: modify（）的参数4，调用在第28行并在第15行定义警告：缺少参数5 对于MyDataBase :: modify（），在第28行调用并在线定义 15 AND undefined变量newprice，newbrand，price。插入代码很好，修改代码导致问题。

这是完整的代码：

    <?php

class MyDataBase{
    private $link;

    public function __construct($server,$user,$password,$base){
        //Conectar
        $this->link = mysql_connect($server,$user,$password);
        mysql_select_db($base,$this->link);
        }

        public function insert($model,$brand,$price){
            mysql_query("INSERT INTO autos (model, brand, price) VALUES ($model,'$brand', $price)",$this->link);}

        public function modify($model,$brand,$price,$newbrand,$newprice){
            mysql_query("UPDATE 'crautos'.'autos' SET 'brand' = '$newbrand',
'price' = '$newprice' WHERE 'autos'.'model' =5 AND 'autos'.'brand' = '$brand' AND 'autos'.'price' ='$price' LIMIT 1) VALUES ($newbrand, $newprice)",$this->link);}

        public function __destruct(){
        //desconectar
        }

}


$conexion = new MyDataBase ('localhost', 'root', '','crcars');
$conexion-> insert(05,"Ford",50000000);
$conexion-> modify("Mitsubishi", 40000000);
?>

Answer 1

更新查询中的语法无效。你不需要VALUES部分。这是应该如何：

 mysql_query("UPDATE 'crautos'.'autos' SET 'brand' = '$newbrand', 'price' = '$newprice' WHERE 'autos'.'model' =5 AND 'autos'.'brand' = '$brand' AND 'autos'.'price' ='$price' LIMIT 1");

Answer 2

你的UPDATE语法无效，就像@Martin指出的那样，你也用两个参数调用modify（），但是函数期望5.将额外的值添加到$conexion-> modify("Mitsubishi", 40000000);

类似的东西：

$conexion-> modify("Mitsubishi", 40000000, $price, $newbrand, $newprice);

PHP：帮助修改MySQL数据库上的表

2 个答案: