Iterate mysqli unbuffered query result more than once

Iterate mysqli unbuffered query result more than once

Problem:
I have a query that returns a large result set. It is too large to bring
into PHP. I get a fatal memory max error and cannot increase memory limit.
Unbuffered Queries
I need to iterate over the array multiple times but mysqli_data_seek
doesn't work on unbuffered queries. mysqli_result::data_seek
//I have a buffered result set
$bresult = $mysql->query("SELECT * FROM Small_Table");
//And a very large unbuffered result set
$uresult = $mysqli->query("SELECT * FROM Big_Table", MYSQLI_USE_RESULT);
//The join to combine them takes too long and is too large
//The result set returned by the unbuffered query is too large itself to
store in PHP
//There are too many rows in $bresult to re-execute the query or even a
subset of it for each one
foreach($bresult as &$row) {
//My solution was to search $uresult foreach row in $bresult to get
the values I need
$row['X'] = searchResult($uresult, $row['Key']);
//PROBLEM: After the first search, $uresult is at its and and cannot
be reset with mysqli_result::data_seek
}
function searchResult($uresult, $val)
while($row = $uresult->fetch_assoc()){
if($row['X'] == $val) {
return $row['X'];
}
}
}
If you have another solution that meets these requirements I will accept
it: - Does not try to join the result in a single query (takes too long) -
Does not run any query for each result in another query (too many queries,
takes too long, slows down system)
Please leave a comment if you need more info.
Thank you.