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sql query question


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im tryingt to make an upgrade script for a database and need to see if spacific colums are present in the table i have tryed

[code]$sql_str = "SHOW COLUMNS FROM table_name LIKE 'approved'";
$this->setSqlDebug("checkcolumDb: $sql_str");
      $result = $wowdb->query($sql_str);
      if ($wowdb->num_rows($result) == 0){
      echo "no colum";
but no column is allways echoed if it exists or not i need tit to not return if it does any one have any help?
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Here, this should work...

$MyTableName = "username"; //Your table name goes here
$sql = "SHOW COLUMNS FROM table_name WHERE Field = '$MyTableName'";
$result = mysql_query($sql);
$count = mysql_num_rows($result);

if ($count > 0){
  echo "The column name already exists";
else {
  echo "There is no column with that name";

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