Help with $wpdb on custom code

Question

So i'm trying to implement some custom doing a SELECT to a table i created.

I'm using the following:

global $wpdb;
$fivesdrafts = $wpdb->get_results("SELECT * FROM wpjk_vuln WHERE IDuser = " . um_profile_id());

foreach ( $fivesdrafts as $fivesdraft ) 
{
  echo $fivesdraft->IDprogram;
}

When i open the page where the IDprogram should be displayed it isn't, not sure why.

BUT, if i add an echo with the query, bellow the code:

global $wpdb;

echo "SELECT * FROM wpjk_vuln WHERE IDuser = " . um_profile_id();

$fivesdrafts = $wpdb->get_results("SELECT * FROM wpjk_vuln WHERE IDuser = " . um_profile_id());

foreach ( $fivesdrafts as $fivesdraft ) 
{
  echo $fivesdraft->IDprogram;
}

The page will display the IDprogram, it's just strange. I already hardcoded the um_profile_id() value and it happens the same thing.

Answer 1

If the IDuser field is an integer, try:

$um_profile_id = um_profile_id();

$fivesdrafts = $wpdb->get_results("SELECT * FROM wpjk_vuln WHERE IDuser = $um_profile_id");