Casper,
my_odbc_sql is just a wrapper for odbc_exec (we also tried odbc_prepare / odbc_execute).
Here is a rewrite:
---
$db = odbc_connect( "exact", "name", "password" );
for( $i = 0; $i < 300; $i++ )
{
echo $i . " \n";
$stmt = odbc_exec( $db, "SELECT * FROM...