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So commit() or endAtomic() will not close the db connection. However
mediawiki will manage the db connections itself and will reuse already open
connections. You should not close() the connection.

Db transactions/atomic sections are used when you have stuff you need to
ensure is consistent (it either fully works or fully fails and if some sort
of error happens the db is reverted back to a known good state). It is not
required just to make write actions to the database, as you can still make
those outside of transactions/atomic sections (technically writes inside a
request but outside an explicit transaction all get wrapped in an implicit
transaction which is committed at the end of request for a web request or
immediatly in a cli request)


I would reccomend creating a new table with a foreign key rather than
trying to add columns to an existing core table. Generally its assumed that
mw core controls the fields present in tables defined by mw core.


RenameUser has a hook to allow extensions to tell it about your custom
extension table if neccesary (should be unnessary if you just have a
foreign key to the actor table)

--
Brian

On Thursday, June 13, 2019, Kevin Zhang <msuzhangke8@gmail.com> wrote:

> Hi,
>
> I have been planning and starting to implement a few of my own extensions.
> Having read through relevant manuals and documentation located at
> mediawiki.org, wanted to clarify a two things:
>
> 1. When using startAtomic()/endAtomic() or begin()/commit() pairs, I
> understand that these will commit changes but does that automatically close
> the connection to the wiki database *$dbr = wfGetDB();* or am I required to
> close that connection with $dbr->close()?
>
> 2. Is it recommended to use foreign keys to the existing User table instead
> of creating a new table column? Concerned that Extensions
> AbuseFilter/RenameUser/UserMerge, could corrupt or cause failure.
>
> Thanks,
>
> Kevin
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