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Re: Will this work? [message #172247 is a reply to message #172244]

Tue, 08 February 2011 01:27

Denis McMahon
Messages: 634
Registered: September 2010

Karma:

Senior Member

On 07/02/11 23:03, Derek Turner 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;
>
> }
>
> 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.

From the manual:

> For SELECT, SHOW, DESCRIBE, EXPLAIN and other statements returning
> resultset, mysql_query() returns a resource on success, or FALSE on
> error.

Note that an empty result set is still a result set!

This might be neater, and allows you to use an integer for your loop:

$conn = mysql_connect($dbserver,$dbusername,$dbpassword);
$1 = 1;
$qryfmt = "select blah blah blah %02d blah blah blah %02d blah blah";

while ($result = mysql_query(sprintf($qryfmt,$i,$i),$conn) &&
mysql_num_rows($result) != 0) {
// do stuff with result
$i++;
}

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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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