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Request #70020 Make mysqli->multi_query use separate packets
Submitted: 2015-07-08 11:20 UTC Modified: 2017-04-06 09:52 UTC
From: mail at tomsommer dot dk Assigned:
Status: Wont fix Package: MySQLi related
PHP Version: 5.6.10 OS:
Private report: No CVE-ID: None
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 [2015-07-08 11:20 UTC] mail at tomsommer dot dk 
Description:
------------
When executing a large query through mysqli->multi_query() you can hit MySQL's max_allowed_packet setting, because all queries are sent as one packet, rather than one query per packet.

Test script:
---------------
$largefiledata = file_get_contents('10G.sql');
$mysqli->multi_query($largefiledata);

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 [2017-04-06 09:52 UTC] johannes@php.net
-Status: Open +Status: Wont fix
 [2017-04-06 09:52 UTC] johannes@php.net 
doing this would require parsing the string, as a MySQL package only allows complete commands. Also the client doesn't know the servers max packet size, making it hard to find the optimal splitting. Thirdly we'd have an issue with error situations. If sent in one big query the server won't continue after an error with the remaining items. To emulate this behaviour we'd have to wait for the response from first batch, till we can send the next batch.
 
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