Question

I have one record in a table in my mysql database. I use the following PHP code to retrieve data:

$result = mysql_query($query = "SELECT realname FROM t_user");

if($result)
{
  while($data=mysql_fetch_assoc($result)){
    echo $data['realname'];
  }
}

the results do not appear, but when I use a do-while loop like below:

if($result)
{
  $data=mysql_fetch_assoc($result);
  do{
    echo $data['realname'];
  } while($data=mysql_fetch_assoc($result));
}

the results appear, then I tried to add one more record to the table, in the while loop, only shows one data record (the first record), and the do-while loop displays all the data. Why is that? Is it because there is my code wrong?

Answer 1

The code you have shown can’t possibly exhibit this problem, so the logical explanation is this:

$result = mysql_query($query = "SELECT realname FROM t_user");

if($result)
{
  // Something fetched a row from $result before this statement is run
  while($data=mysql_fetch_assoc($result)){
    echo $data['realname'];
  }
}

Seeing how you’re comparing two similar codes, you may have accidentally written something in between the two:

if($result)
{
  mysql_fetch_assoc($result);
  while($data=mysql_fetch_assoc($result)){
    echo $data['realname'];
  }
}