Adding a resultset to an existing result set - php

Question

I am trying to solve a problem where I need to execute a query on the database within a do while loop and keep on adding to the resultset. However once its finished running all the queries and I then start processing the result set php gives the error
Warning: mysql_fetch_array() expects parameter 1 to be resource,
string given in
The idea is it executes a query with a limit of 0,2 then executes again with a limit of 2,2 and so on until the numbers of rows returned is empty. I know the best solution would be to do a count and work out from there but this is not an option as the database is too large.
Below is the code that I currently have
$tempResult = "";
$i = 0;
$result = null;
do
{
if (is_resource($tempResult))
{
echo 'Cleared Result <br />';
mysql_free_result($tempResult);
}
echo 'Count: ' . $i . '<br />';
$query = "select * from table_test LIMIT $i, 2";
$tempResult = mysql_query($query) or die ("MySQL Error: " . mysql_error());
echo 'Temp Result: ' . $tempResult .' <br />';
$i = $i + 2;
$result .= $tempResult;
} while (mysql_num_rows($tempResult) > 0);
while ($myrow = mysql_fetch_array($result))
{
echo $myrow['col1'] . ' + ' . $myrow['col2'] .
' + ' . $myrow['col3'] . ' <br />';
}
Thanks for any help you can provide.

Answer 1

Why dont you use a result array? For example something like this:
$tempResult = "";
$i = 0;
$resultArray = array();
$result = null;
do
{
if (is_resource($tempResult))
{
echo 'Cleared Result <br />';
mysql_free_result($tempResult);
}
echo 'Count: ' . $i . '<br />';
$query = "select * from table_test LIMIT $i, 2";
$tempResult = mysql_query($query) or die ("MySQL Error: " . mysql_error());
$resultArray = merge($resultArray, mysql_fetch_array($tempResult));
echo 'Temp Result: ' . $tempResult .' <br />';
$i = $i + 2;
} while (mysql_num_rows($tempResult) > 0);
while ($resultArray as $myRow)
{
echo $myrow['col1'] . ' + ' . $myrow['col2'] .
' + ' . $myrow['col3'] . ' <br />';
}

Answer 2

Well, from such an unusual question we can only guess the right answer.
My bet:
Your goal is to do some calculations on the data stored in the table.
And you are going to do it in the PHP script instead of the proper way of calculating using database facilities.
So, it's better you would do all the calculations in one query.
Anyway,
It is always a good practice to ask a core question, a root problem, instead of a question related to some unusual way you choose to solve it.
Once you ask this one, you will get complete and professional answer.

Answer 3

Why not just print the results in the first loop?
$i = 0;
do
{
$query = "SELECT * FROM table_test LIMIT $i, 2";
$result = mysql_query($query) or die("MySQL Error: " . mysql_error());
while ($myrow = mysql_fetch_array($result))
{
echo $myrow['col1'] . ' + ' . $myrow['col2'] . ' + ' . $myrow['col3'] . ' <br />';
}
$i = $i + mysql_affected_rows();
} while (mysql_affected_rows() > 1);
echo 'Count: ' . $i . '<br />';
But really, this method just seems like a way to add additional overhead to fetching rows from the database.