MYSQL how to ensure that one query is ran right after another

I have problems with concurrent connections. How do i ensure that one query in ran just after another, without queries from another con开发者_高级运维nections coming in between. I'll probably need some kind of locking, but what kind? ..or? transactions?

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Run the 2 queries in SERIALIZABLE isolation level - it guarantees that the result from the 2 queries is exactly the same as if they were the only 2 queries performed, by locking every record they access, but without locking the rest of the table/tables.

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If you are using the innodb storage engine, you could use transaction to realize what you want. Just execute BEGIN before the both queries and COMMIT after them.

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You can use LOCK TABLE to prevent other users from updating that table.

Link
http://dev.mysql.com/doc/refman/5.0/en/lock-tables.html