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Re: Will this work? [message #172245 is a reply to message #172244]

Mon, 07 February 2011 23:28

Robert Heller
Messages: 60
Registered: December 2010

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At 7 Feb 2011 23:03:15 GMT Derek Turner <frderek(at)cesmail(dot)net> wrote:

>
> How long and complicated can a while condition be?
>
> I want to:
>
> define a string variable ($i) starting at "01"
> use this in a mysql query
> increment the string
> dropout of the while when a zero result comes back from mysql
>
> So, would something like:
>
> while ($sql="some multi-lined mysql query containing $i twice" &&
> $result=mysql($conn, $sql)){
>
> do some stuff including incrementing $i;
>
> }

Wouldn't this be a more sensable solution:

function largequery($conn,$i) {
$sql="some multi-lined mysql query containing $i twice";
return mysql($conn, $sql);
}

function increment(&$i) {
/* do a string increment of $i */
}

for ($i="01";$result=largequery($conn,$i);increment($i)) {
do some stuff;
}

Functions exist for a reason.

>
> presumably the first condition will always return true, will the second
> return false if no matches are found? Can a while condition run over
> several lines like this? The manual doesn't seem to say.

Yes, a while condition can run over several lines. Mind your
continuation characters... OTOH, if you have something like that, it
usually makes sense to put such things in functions. Makes the code
much easier to read and maintain. Bottom line: multi-line conditions are
possible, but there is little real need to do that.

>

--
Robert Heller -- 978-544-6933 / heller(at)deepsoft(dot)com
Deepwoods Software -- http://www.deepsoft.com/
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[Message index]

		Will this work? By: Derek Turner on Mon, 07 February 2011 23:03
		Re: Will this work? By: Robert Heller on Mon, 07 February 2011 23:28
		Re: Will this work? By: Denis McMahon on Tue, 08 February 2011 01:27
		Re: Will this work? By: Derek Turner on Tue, 08 February 2011 13:06
		Re: Will this work? By: Jerry Stuckle on Tue, 08 February 2011 13:36
		Re: Will this work? By: Denis McMahon on Tue, 08 February 2011 15:25
		Re: Will this work? By: Denis McMahon on Tue, 08 February 2011 15:35
		Re: Will this work? By: Derek Turner on Tue, 08 February 2011 16:36
		Re: Will this work? By: Denis McMahon on Tue, 08 February 2011 17:23
		Re: Will this work? [SOLVED] By: Derek Turner on Thu, 10 February 2011 17:05

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