Re: Getting database name from link identifier

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On Tue, Feb 25, 2014 at 5:09 PM, Aziz Saleh <azizsaleh@xxxxxxxxx> wrote:
> On Tue, Feb 25, 2014 at 4:59 PM, Larry Martell <larry.martell@xxxxxxxxx>
> wrote:
>> On Tue, Feb 25, 2014 at 4:53 PM, Aziz Saleh <azizsaleh@xxxxxxxxx> wrote:
>> > On Tue, Feb 25, 2014 at 4:47 PM, Larry Martell <larry.martell@xxxxxxxxx>
>> > wrote:
>> >> On Tue, Feb 25, 2014 at 4:41 PM, Aziz Saleh <azizsaleh@xxxxxxxxx>
>> >> wrote:
>> >> > On Tue, Feb 25, 2014 at 4:28 PM, Larry Martell
>> >> > <larry.martell@xxxxxxxxx>
>> >> > wrote:
>> >> >>
>> >> >> Is there any way to find out what database I am connected to from a
>> >> >> link identifier?
>> >> >>
>> >> >> I have some code this does this:
>> >> >>
>> >> >> @ $db = mysql_pconnect($dbserver, $dbuser, $dbpass);
>> >> >> @ mysql_select_db($dbname, $db);
>> >> >>
>> >> >> I know at the time this is executed $dbname is what I want it to be.
>> >> >> But later on when I pull data using $db, I get data from a different
>> >> >> database. If I try to echo $db at the time of the query I get
>> >> >> "Resource id #5". Can I get the database name from $db?
>> >> > You won't be able to, you will need to execute a query on that DB
>> >> > connection
>> >> > handler to check the DB name currently used:
>> >> >
>> >> > SELECT DATABASE() as DB_NAME
>> >>
>> >> Thanks! Indeed I am not 'using' the db that $dbname is set to when I
>> >> execute the mysql_select_db command. Now I just have to figure out why
>> >> that is.
>> >
>> >
>> > Are you making a call to mysql_select_db besides the above during your
>> > code
>> > execution (even on a different DB handler)? If yes, then that would be
>> > the
>> > issue since.
>>
>> I was simplifying the code for purposes of asking the question.
>> Actually the app connects to 23 different databases on different
>> servers. The link identifiers are stored in an array. Each
>> mysql_select_db is called with a different link identifiers. I am
>> echoing out the link identifiers and the array index when I create
>> them and also when I use them. I see that the index is the same, the
>> resource id # is the same, but I'm connected to a different db then
>> the one I called mysql_select_db with.
>
>
> Is it safe to assume that that all of those 23 connections have different
> host/user/password combination?

No, there are multiple connections on each server.

> I ran into issues before, where changing the database using the
> mysql_select_db function changed the db for the connection for all users who
> are sharing that connection - PHP was running as apache module and not cgi.
> I ended up using mysql_connect with the third param as true to force a new
> connection.

I'm using mysql_pconnect, which does not have the new_link param.
Sounds like you've hit the problem I'm having. I'll try changing to
mysql_connect with new_link true and see if that fixes it.

Thanks!

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