way to check for if sql row exists? - php

Question

my problem is this
i am fetching a mysql row via this
$sql_istorrenthere = $this->query_silent("SELECT media_type
FROM " . DB_PREFIX . "auction_media WHERE
auction_id='" . $item_details['auction_id'] . "'");
$row = mysql_fetch_array($sql_istorrenthere);
and then calling it with this
if ($row['media_type'] == 4)
{
$display_output = GMSG_TORRENT;}
else
{
$display_output = GMSG_NOTORRENT;
}
}
however, media_type has multiple values, (1,2,3,4)
how to write it so that it checks if 4 exists? because now i believe it is checking if media_type equals 4 and that is false, which is giving me the wrong display_output

Answer 1

You can use mysql_num_rows to determine if any rows were returned, and this works by adding a search condition in your query adding " AND media_type = 4" to the end
if(mysql_num_rows($sql_istorrenthere)) {
} else {
}
// You can loop through records by doing the following, this prints out every media type :)
while ($row = mysql_fetch_array($sql_istorrenthere)) {
echo $row['media_type'] . '<br />';
}

Answer 2

You can just add on "AND media_type = '4'" to your query. But you really should use paramaterized queries.
Once your query has "AND media_type = '4'" you can check RowCount.

Answer 3

There are probably better ways, but here's one idea.
$media_type_ids = explode(',', $row['media_type']);
if (array_search(4, $media_type_ids) !== FALSE) {
// found
}
It could be possible to even do this in-situ in the database query ... potentially.

Answer 4

// Comment the next line after you get what it is
#print ("Value of media type is: >>>".$row['media_type']."<<<"); // Line to be commented
if (isset($row['media_type']) && $row['media_type'] == 4) {
$display_output = GMSG_TORRENT;
}
else {
$display_output = GMSG_NOTORRENT;
}
To fetch all media types:
<?php
$sql_istorrenthere = $this->query_silent("SELECT media_type FROM " . DB_PREFIX . "auction_media");
while ($row = mysql_fetch_array($sql_istorrenthere)) {
// Comment the next line after you get what it is
#print ("Value of media type is: >>>".$row['media_type']."<<<"); // Line to be commented
if (isset($row['media_type']) && $row['media_type'] == 4) {
$display_output = GMSG_TORRENT;
}
else {
$display_output = GMSG_NOTORRENT;
}
}