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How do I lock tables using DBI and mySQL?

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Contributed by filmo on Sep 11, 2001 at 08:41 UTC
Q&A  > database programming


Answer: How do I lock tables using DBI and mySQL?
contributed by blakem

See the Lock Tables syntax in the MySQL documentation. Then wrap each sql query inside of something like:

$dbh->do(" ... ");
Answer: How do I lock tables using DBI and mySQL?
contributed by filmo

Follow up question: Does the lock cover multiple statement handles? i.e.

$dbh->do("LOCK TABLES foo WRITE, bar READ"); $sth->prepare("SELECT x,y,z FROM bar"); $sth2->prepare("INSERT INTO foo SET a = ?"); while (@ary = $sth->fetchrow_array()) { $sth2->$execute($ary[0]); } $sth2->finish(); $sth->finish(); $dbh->do("UNLOCK TABLES");
Is this correct or will $sth2 not be able to access the tables because of the lock?
Answer: How do I lock tables using DBI and mySQL?
contributed by blakem

Yes, I that should work... Table locking is done at the per-thread level, and I think both statement handles above exist within the same thread.

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