需要从数据库

Question

的表中删除旧有形象的名字hi2all我已经包含2场那样

---

TABEL |名称| imags _ | __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _

当用户在我的网站logined我注册这是名称在会议上，当他上传他的新照片

我想删除它的旧ph值oto并将他的名字设置为新照片如何做到这一点？

我的代码，以dB为单位插入每个上传的图片是作为下面我应该添加到我的

$me=$_SESSION['logged-in']; 


$con=mysqli_connect("localhost","root","","register_form"); 
// Check connection 
if (mysqli_connect_errno()) 
    { 
    echo "Failed to connect to MySQL: " . mysqli_connect_error(); 
    } 



@mysqli_query($con,"INSERT INTO imgs (name, imags) 
VALUES ('$me', '$filename')"); 



mysqli_close($con); 

---

，这里是我的代码，以显示它

<?php 




      $me=$_SESSION['logged-in']; 
      $con=mysqli_connect("localhost","root","","register_form"); 
    // Check connection 
    if (mysqli_connect_errno()) 
     { 
     echo "Failed to connect to MySQL: " . mysqli_connect_error(); 
     } 

    $result = mysqli_query($con,"SELECT imags FROM imgs where name LIKE '$me' "); 


    while($row = mysqli_fetch_array($result)) 
     { 
      $pathimg=$row['imags']; 

      $d = dir("image"); 

    $entry = $d->read(); 
    /*while (false !== ($entry = $d->read())) { 
     echo "<li><img src=\"/ConnectMe/html/image/" . $entry . "\">" . $entry . "</li>"; 
    } 

     */ 
     } 

    mysqli_close($con); 

echo" 

<img width='50' height='60' src=\"/ConnectMe/html/image/$pathimg" . @$entry . "\"> 
"; 

Answer 1

如果我的理解你很想在插入新照片之前删除包含当前登录名的旧表格行。

将您的INSERT语句更改为该行代码。

检查包含该名称的表中是否有行。如果是这样，更新与新照片的行。如果不是只用INSERT语句插入新行。

此链接可能会有帮助：mysqli_affected_rows。

$result = mysqli_query($con,"SELECT * FROM imgs WHERE name = '$me'"); 
if(mysqli_affected_rows() == 1) //it means that user uploaded a photo before 
{ 
    $update = mysqli_query($con, "UPDATE imgs SET imgs = '$filename' WHERE name = '$me'"); 
    if(mysqli_affected_rows() == 1) //it means that UPDATE was successfull 
    {echo 'Your photo was updated successfully';} 
} 
else 
{ 
    @mysqli_query($con,"INSERT INTO imgs (name, imags) VALUES ('$me', '$filename')"); 
} 

如果你想删除文件系统文件，你应该使用unlink的功能，给原来的路径作为参数。

我希望这对你有用。