Question

我在$count部分收到错误，以验证数据是否存在，它说那个

它返回布尔值

但我不明白为什么。我已对错误所在的哪一行发表评论。

    $check = mysql_fetch_array(mysql_query("SELECT * FROM `request` WHERE `Request_ID`=''"));
    $count = mysql_num_rows($check); // error is here 

    if($count > 0){
        ?>
        <script>
            alert('Data Already Exist!');
        </script>
        <?php

    }else{
    mysql_query("INSERT INTO `request` (`Request_Name`, `Request_Date`, `Request_By`,`Description`,`Quantity`, `Price`, `Destination`,`Reason`) VALUES ('$name', '$date', '$req','$desc','$qty','$prc','$dest','$reason',)");
    ?>
    <script>
        window.location = "home.php#requi.php";
    </script>
    <?php
    }

}

如何解决这个问题？

Answer 1

您只能在结果对象上调用mysql_num_rows。如果要获取结果的num行，则必须使用以下代码：

$check = mysql_query("SELECT * FROM `request` WHERE `Request_ID`=''");
$count = mysql_num_rows($check); // error should be gone

//Optional:
while($data = mysql_fetch_array($check, MYSQLI_ASSOC))
{
    $result[] = $data;//To get all rows, one by one
}

另外请注意我不建议使用mysql，而是使用mysqli，如果您需要帮助，我将很乐意为您提供进一步帮助。

Answer 2

尝试使用mysql_num_rows()替换mysql_fetch_array()。

检查参考here。

Answer 3

mysql_fetch_array：

  @IBAction func loginAction(sender: AnyObject) {
    let email = textEmail.text
    let password = textPassword.text
    spinnerInitialization()
    startSpinner()
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    appDelegate.loginRequest(email!, password: password!)
}

func spinnerInitialization(){
    spinnerView = UIView(frame: CGRect(x:0, y:0,width: 250,height: 50))
    spinnerView.backgroundColor = UIColor.blackColor()
    spinnerView.layer.cornerRadius = 10
    let wait = UIActivityIndicatorView(frame: CGRect(x:0,y: 0,width: 50,height: 50))
    wait.color = UIColor.whiteColor()
    wait.hidesWhenStopped = false
    wait.startAnimating()
    let text = UILabel(frame: CGRect(x:60,y:0,width:200,height: 50))
    text.textColor = UIColor.whiteColor()
    text.text = "Please wait..."
    spinnerView.addSubview(wait)
    spinnerView.addSubview(text)
    spinnerView.center = self.view.center
    spinnerView.tag = 1000
}

func startSpinner(){
    view.addSubview(spinnerView)
}

func stopSpinner(){
    let subViews = view.subviews
    for subView in subViews{
        if subView.tag == 1000{
            subView.removeFromSuperview()
        }

    }
}

我的猜测是它返回false。这就是你得到错误的原因。

错误说它给出了布尔值

3 个答案: