Question

My code:

mysql_query("SET AUTOCOMMIT=0");
mysql_query("START TRANSACTION");

insert_query, update_query1, update_query2

mysql_query("COMMIT");
update_query3

Why does update_query3 query doesn’t work if I put it after COMMIT? It works if I put it before the COMMIT. Why is that? It’s really strange.

Thank you

Answer 1

Because COMMIT (or ROLLBACK for that matter) marks the end of the transaction.

You’d have to use:

mysql_query("COMMIT AND CHAIN");

..to create a new transaction to begin as soon as the current one ends, and the new transaction has the same isolation level as the just-terminated transaction.

But it still means you need to have:

mysql_query("COMMIT");

…after the update_query3 to commit the changes.