Question

* 强文 *我不知道标题是否清晰，

但是我想要一个PHP脚本来告诉MySQL列是否有数据，如果打印一行文本，但是如果 NULL ，则为打印别的东西......

有意义吗？

这就是我所拥有的，我知道这是完全错误的......

$link = mysql_connect($DBHOST, $DBUSER, $DBPASSWORD);
mysql_select_db($DBNAME); 
if (!$link) {
    die('Could not connect: ' . mysql_error());
}

$result = mysql_query("SELECT * FROM members");

while($row = mysql_fetch_assoc($result))
{
     if($row['VIP'] = '1')
     {
        echo('VIP');
     }
     else
     {
        echo('Non-VIP');
     }
}

修改::

以下是完整代码：

<?php

$DBTYPE = 'mysql';
$DBHOST = 'host';
$DBUSER = 'username';
$DBPASSWORD = 'password';
$DBNAME = 'database';

$link = mysql_connect($DBHOST, $DBUSER, $DBPASSWORD);
mysql_select_db($DBNAME); 
if (!$link) {
    die('Could not connect: ' . mysql_error());
}
$member_id= '5'; // get value of the member, assumed that you have post the data into id. change if it is different into your code

$result = mysql_query("SELECT * FROM members where id=$member_id");

while($row = mysql_fetch_assoc($result))
{
     if($row['VIP'] == '1')
     {
        echo "<img src='../images/VIP.png' />";
     }
     else
     {
        echo 'Non-VIP';
     }
}
?>

Answer 1

   $result = mysql_query("SELECT * FROM members");

   if(mysql_num_rows($result) > 0) // or you can check for 1 too

    {
    $row = mysql_fetch_assoc($result);
    // your text output here
    //echo VIP or whatever
    }
    else { echo "non-vip"; }

Answer 2

使用==检查相等性，如下所示：

if($row['VIP'] == '1')
{
  echo('VIP');
}
else
{
 echo('Non-VIP');
}

修改

使用以下代码获得所需结果

$link = mysql_connect($DBHOST, $DBUSER, $DBPASSWORD); mysql_select_db($DBNAME); if (!$link) { die('Could not connect: ' . mysql_error()); } $member_id=$_POST['id']; // get value of the member, assumed that you have post the data into id. change if it is different into your code $result = mysql_query("SELECT * FROM members where id=$member_id"); while($row = mysql_fetch_assoc($result)) { if($row['VIP'] == '1') { echo "<img src='../images/VIP.png' />"; } else { echo 'Non-VIP'; } }

Answer 3

如果我理解正确，您希望显示用户是VIP还是Regular User。如果是这样，您需要修改SELECT以获取用户行，而不是每行。

$id = ...; //logged in user id [ie. $loggedin->id, $_SESSION['id'], etc]

$result = mysql_query("SELECT * FROM members WHERE id = $id");

while($row = mysql_fetch_assoc($result)){

 if($row['VIP'] == '1')
 {
    echo('VIP');
 }
 else
 {
    echo('Non-VIP');
 }
 }

请注意，不应使用mysql函数编写新代码。您应该学会使用mysqli or PDO

PHP如果MySQL列= 1打印，否则打印其他内容

3 个答案: