Cycle through MySql database rows

I am not totally new to programming, I have a year in VB.NET and want to learn some PHP. My goal is to convert a VB.NET program into something web based and I am thinking PHP is the way I want to go.

So I can currently connect to the MySQL database and output the data. Next step is to output the data into textboxes or similar. Getting the data in the textboxes, etc seems easy enough. What I need to know is how to cycle through the results, with a forward, back, first, last button. This is similar to a binding manager in VB.NET which cycles through your current dataset.

ParanoidOneAsked:
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maUruConnect With a Mentor Commented:
for cycling through results i use a bit of simple code, something like:

$wheredata = " where price > 100 "; // example, change with your query data
$totalrecords = mysql_num_rows(mysql_query("select id from table $wheredata"));
$page = (!isset($_GET['page'])) ? 1 : $_GET['page'];
$rowsperpage = 20;
$totalpages = ceil($numrows/$rowsperpage);
if ($page > $totalpages) { echo 'wrong page'; exit; }
$offset = ($page - 1) * $rowsperpage;
$q = "select * from table $wheredata limit $offset, $rowsperpage";
$r = mysql_query($q);
while ($row = mysql_fetch_assoc($r)) {
  // echo list data eg:
  echo $row['ID'] . ' - ' . $row['price'] . "\n";
}
for ($i = 1; $i <= $totalpages; $i++) {
  if ($page != $i) {
    echo '<a href="' . $PHP_SELF . '?page=' . $i . '">' . $i . '</a>';
  }
  else {
    echo '<b>' . $i . '</b>';
  }
}


i just wrote this, its sure to have some errors, but you get the idea.
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pritaeasSoftware EngineerCommented:
If you do not want to execute a query each time, you can store the results in a session, or create a class to do this (or any other caching method you can think of). Otherwise you need to store the index of the current record yourself, and on a button submit retrieve the next one with a new query.
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maUruCommented:
sorry this line:

$totalpages = ceil($numrows/$rowsperpage);

should be this:

$totalpages = ceil($totalrecords/$rowsperpage);
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ParanoidOneAuthor Commented:
I have tried your code and other people code and I get this a lot.

Notice: Undefined variable: PHP_SELF in c:\Inetpub\wwwroot\new\index.php on line 34

Why does my PHP_SELF variable never seem to work ??
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ParanoidOneAuthor Commented:
By the way this code.

<?php
echo $PHP_SELF;
?>

Also produces

Notice: Undefined variable: PHP_SELF in c:\Inetpub\wwwroot\new\index2.php on line 2
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ParanoidOneAuthor Commented:
Ok REGISTER_GLOBALS was off, set it to on and it is fixed.
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