Question

I am needing to run more than one Mysql Query using PHP. I have a site and pull all the information from the databse

$sql = "SELECT * FROM $table WHERE ID=$escape";
$query = mysql_query($sql) or die(mysql_error());
$rentals = mysql_fetch_assoc($query);

Now I have two other queries I need to also run for Previous and Next Buttons

$sqlPrev = 'SELECT `id` FROM `table`
        WHERE `id` < '$curId' AND `catId` = '$curCat'
        ORDER BY `id` DESC LIMIT 1;

$sqlNext = 'SELECT `id` FROM `table`
        WHERE `id` > '$curId' AND `catId` = '$curCat'
        ORDER BY `id` ASC LIMIT 1;

I have the coding right when I run these in PHP MyAdmin, however when I try to execute them via the website I get a mysql error!

Answer 1

mysql_query can only execute one query at a time.

Basically you just need to have 3 calls to mysql_query.

$sql = "SELECT * FROM $table WHERE ID=$escape";
$query = mysql_query($sql) or die(mysql_error());
$rentals = mysql_fetch_assoc($query);

$sqlPrev = 'SELECT `id` FROM `table`
        WHERE `id` < ' . $curId . ' AND `catId` = ' . $curCat . '
        ORDER BY `id` DESC LIMIT 1';

$sqlNext = 'SELECT `id` FROM `table`
        WHERE `id` > ' . $curId . ' AND `catId` = ' . $curCat . '
        ORDER BY `id` ASC LIMIT 1';

$resultPrev = mysql_query($sqlPrev);
$resultNext = mysql_query($sqlNext);

// todo: check that the above queries executed successfully
// if (!$resultPrev) echo mysql_error();

if (mysql_num_rows($resultPrev)) {
    $prev = mysql_fetch_array($resultPrev);
    $prevId = $prev['id'];
} else {
    $prevId = null; // there is no previous item
}

if (mysql_num_rows($resultNext)) {
    $next = mysql_fetch_array($resultNext);
    $nextId = $next['id'];
} else {
    $nextId = null; // there is no next item
}