Locking a MySQL INNODB row in PHP?

$mysqli->autocommit(FALSE); $mysqli->query("BEGIN;"); $mysqli->multi_query("SELECT id FROM links WHERE id > (SELECT value FROM meta WHERE name='scan' FOR UPDATE) LIMIT 1000;UPDATE meta SET value=value+1000 WHERE name='scan';"); $mysqli->commit() It's a complex issue; locking and transaction levels, but the magic above was the BEGIN statement. Without it, each statement was running in its own transaction level, and the FOR UPDATE lock was being unlocked too early.

$mysqli->autocommit(FALSE); $mysqli->query("BEGIN;"); $mysqli->multi_query("SELECT id FROM links WHERE id > (SELECT value FROM meta WHERE name='scan' FOR UPDATE) LIMIT 1000;UPDATE meta SET value=value+1000 WHERE name='scan';"); $mysqli->commit(); It's a complex issue; locking and transaction levels, but the magic above was the BEGIN statement. Without it, each statement was running in its own transaction level, and the FOR UPDATE lock was being unlocked too early.

Query("SELECT id FROM links WHERE id > (SELECT value FROM meta WHERE name='scan' LOCK IN SHARE MODE) LIMIT 1000 LOCK IN SHARE MODE; UPDATE meta SET value=value+1000 WHERE name='scan';"); I'm not sure if this is what you are looking for or not, but if so remember to unlock tables afterward when/where necessary and make sure that the account you are using has LOCK privileges. MySQL Documentation on INNODB READ LOCKS.

This hung my server - each query took forever. – servermanfail Feb 13 at 5:20.

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