Selecting a row based on multiple column values? - php

Question

I'm working on a little system for SecondLife which involves a bit of heavy use of databases & I've run into a problem I can't for the life of me solve.
I'm trying to run a query that selects an entire row based on two different column values. I'm using the $_GET[''] call to identify which details I need, and then I need to pull all the data from the entire row and echo it onto a blank page.
Now, I got it to work at first, but it was pulling ALL the rows created by a UUID and echoing them, when I only needed a specific. Then I tried to get it to work with a second identifier (which is a column called 'field' for the purpose of testing), and that's pretty much where I lost it.
I just need to select one row that has two exact values, and I need it to be draconian so it only selects a row that has both and not just one of the two.
Any ideas?
Script enclosed (don't mind the mess or the commented out code which I kept for reference; I am going to clean the script once I get it working!)
<?php
// Get key from the parameter.
$avatar_key = $_GET['key'];
// Quest params.
$questname = $_GET['questname'];
$questid = $_GET['id'];
// Connect to the database. $con holds connection info.
$con = mysql_connect("localhost","user","pass");
// Error checking.
if(!$con)
{
die('Could not connect: '.mysql_error());
}
// Select the DB we want.
mysql_select_db("yyyyy_slcom",$con);
// Build the query.
$query = "SELECT * FROM sldb_data WHERE sldb_data.uuid = '$avatar_key' AND sldb_data.field = '$questname'";
/*$query = "select * from (
select uuid, field, value, progress, ROW_NUMBER() OVER (PARTITION BY uuid ORDER BY progress DESC)
";*/
// Run the query, store the result in variable $result.
$result = mysql_query($query);
if(!result)
{
die('Error: ' . mysql_error());
}
// Check how many rows we got back with our query.
$rows_returned = mysql_num_rows($result);
echo $row['field'];
// If we get anything back,
if($rows_returned > 0)
{
//echo $row['field'] . ' was found.' . $questname;
/*if(!$row['field'])
{
echo 'You are not on this quest yet.';
}
elseif(($row['field']) && ($row['value'] == "notstarted"))
{
echo 'This quest hasn\'t started yet.';
}
elseif(($row['field']) && ($row['value'] == "started"))
{
echo 'You are on quest: "' .$row['field']. '"';
}*/
/* $fields = mysql_list_fields("tenaar_slcom","sldb_data");
$columns = mysql_num_fields($fields);
for ($i = 0; $i < $columns; $i++) {$field_array[] = mysql_field_name($fields, $i);}
if(in_array($quest, $field_array))
{
echo 'Your quest is ' . $row['field'];
}
elseif(!in_array($questname, $field_array))
{
echo 'You are not on this quest yet.';
}
elseif((in_array($questname, $field_array)) && ($row['value'] == "notstarted"))
{
echo 'You have not started quest "' .$row['field']. '" yet.';
} */
// cycle through and print what we got.
//while($row = mysql_fetch_array($result))
//{
//echo 'Quest name: ' . $row['field'] . ' | Progress: ' .$row['value'] . '<br />';
//}
}
/*else
{
echo 'You are not on this quest yet.';
}*/
// Close the connection.
mysql_close($con);
?>

Answer 1

You appear to be missing a step in-between the time you get the number of rows and when you print out the field. You need to actually store the results of the query in the $row array.
$rows_returned = mysql_num_rows($result);
$row = mysql_fetch_array($result);
echo $row['field'];