如何从表 WHERE id=variable 中选择字段？

Question

I have a variable of the logged in user ( $steamid ) that I need to use to select and echo specific fields from the database. I am using the following code, but it is working incorrectly. All database info is correct, the tables, columns, and variables are not misspelled. Not sure what I'm doing wrong.

<?php
$con=mysqli_connect("private","private","private","private");
// Check connection
if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }

$sql = "SELECT `bananas` FROM `es_player` WHERE `steamid` = '$steamID'";

if ($result=mysqli_query($con,$sql))
  {
  // Get field information for all fields
  while ($fieldinfo=mysqli_fetch_field($result))
    {
    printf("bananas: %n",$fieldinfo->bananas);
    }
  // Free result set
  mysqli_free_result($result);
}

mysqli_close($con);
?>

No errors are shown, it simply returns "bananas:" with nothing after it. I feel like I didn't to it correctly, does anyone know what I might've done wrong? Here is a screenshot of my database table so you know what it looks like http://puu.sh/gCY3d/983b738458.png .

Answer 1

Try this:

$query = Mysqli_Query($con, "SELECT * FROM `es_player` WHERE `steamid`='$steamID'") or die(mysql_error());

  if( ! mysqli_num_rows($query) ) 
  {
  echo 'No results found.';
  }
  else
  {   
   $bananas_array = mysqli_fetch_assoc($query);
   $bananas = $bananas_array['bananas'];
   echo 'Number of bananas: '. $bananas;      
  }

If this doesn't work, there is a problem with STEAM_ID format. You could try triming the IDs to be JUST a number, and add the STEAM_x:x: to it later.