Question

我这里有一个函数，在登录后调用数据库中的详细信息。我遇到的问题是我收到了这个：

警告：mysqli_fetch_array（）期望参数1为mysqli_result，布尔值在...中给出。

请您指出需要更改的内容以及如何从数据库中获取所需的数据？

function profile(){
include "config.php";
$conn = mysqli_connect($host,$user,$pass,$db);

//check
if( mysqli_connect_errno($conn) ){
    echo "Error in DB";
}else{
    //connected
}

//prepare
$sql = "SELECT * FROM accounts where username='" . $_SESSION['username'] . "'";

//display 
$result = mysqli_query($conn,$sql);
$myrow=mysqli_fetch_array($result) ){ // --->the warning is from this line
        do{
            $info= array();
            $info['firstName'] = $myrow['firstName'];
            $info['middleInitial'] = $myrow['middleInitial'];
            $info['lastName'] = $myrow['lastName'];
            $info['mobile_no'] = $myrow['mobile_no'];
            $info['email_address'] = $myrow['email_address'];
            $info['registration_date'] = $myrow['registration_date'];
            $account[] = $info;
        }while($myrow=mysqli_fetch_array($result));
    }
    return $account;

}

Answer 1

$result为null。

来自PHP文档mysqli_query：

失败时返回FALSE。成功的SELECT，SHOW，DESCRIBE或 EXPLAIN查询mysqli_query（）将返回一个mysqli_result对象。对于其他成功的查询mysqli_query（）将返回TRUE。

Answer 2

USE

if($result){
    $myrow=mysqli_fetch_array($result) ){ 
            do{
                $info= array();
                $info['firstName'] = $myrow['firstName'];
                $info['middleInitial'] = $myrow['middleInitial'];
                $info['lastName'] = $myrow['lastName'];
                $info['mobile_no'] = $myrow['mobile_no'];
                $info['email_address'] = $myrow['email_address'];
                $info['registration_date'] = $myrow['registration_date'];
                $account[] = $info;
            }while($myrow=mysqli_fetch_array($result));
        }
        return $account;

    }

Answer 3

mysqli_affected_rows()函数返回上一个SELECT，INSERT，UPDATE，REPLACE或DELETE查询中受影响的行数。

    <?php
    //display 
    $result = mysqli_query($conn,$sql);

    $count=mysqli_affected_rows($con);


     if($count>0)
     {
            $myrow=mysqli_fetch_array($result) ){ 
                    do{
                        $info= array();
                        $info['firstName'] = $myrow['firstName'];
                        $info['middleInitial'] = $myrow['middleInitial'];
                        $info['lastName'] = $myrow['lastName'];
                        $info['mobile_no'] = $myrow['mobile_no'];
                        $info['email_address'] = $myrow['email_address'];
                        $info['registration_date'] = $myrow['registration_date'];
                        $account[] = $info;
                    }while($myrow=mysqli_fetch_array($result));
                }
                return $account;

    }
    else
    {
       echo "empty";    
    }

    ?>

警告：mysqli_fetch_array（）期望参数1为mysqli_result，布尔值为

3 个答案: