John Simpson wrote:


while answering a question for somebody on another mailing list i happened to notice that, at least as of vpopmail 5.4.10, the structure of the "valias" table created in a mysql database does not have any provision for sequencing the entries attached to a given alias.


first, how does the vdelivermail program decide in which order to process the entries when there are multiple records?

It doesn't.

does it use them in the order that mysql delivers them?


and if so, does mysql have any guaranteed order that it will present
> the records with an explicit ORDER BY clause in the query?

There is no ORDER BY clause in the query, so the order the records is random. They may appear to follow the order they were entered in, but adds and deletes can change the order.

second, if a user has one or more existing valias records, the "valias -i" command would seem to work by sending an INSERT query with the new line. is the new line added to the beginning of the sequence, the end of the sequence, or is there in fact no guaranteed sequence at all?

If there is no ORDER BY clause in a query the order the records are returned in is random, and subject to change without notice. We need to add an order field, and an ORDER BY clause, but it hasn't happened yet.

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