Checking for empty string - long
| From: | Martin Skjöldebrand | Date: | Tue, 27 Mar 2001 19:46:17 +0000 |
| Subject: | Checking for empty string - long | ||
| Groups: | php.db | ||
| Request: | Send a blank email to php-db+get-7907@lists.php.net to get a copy of this message | ||
Thanks for all suggestions to my earlier questions.
This time I'm totally stuck though. I've been trying various solutions for
over a day now.
How do I check for an empty string in PHP/MySQL.
Scenario:
I have two query returning different results not necessarily of equal
length:
$queryjobs1 = "SELECT ticket.t_id, t_client, t_summary, e_assignedto,
e_status FROM ticket, events ";
$queryjobs1 .="WHERE e_assignedto = '$user' AND e_status = 'OPEN' AND
ticket.t_id = events.t_id";
$jobresult1 = mysql_query($queryjobs1, $mysql_link) or die("query failed, "
.
mysql_error());
Which brings up a list of open tickets.
$queryjobs2 = "SELECT ticket.t_id, t_client, t_summary, e_assignedto,
e_status FROM ticket, events ";
$queryjobs2 .="WHERE e_status = 'CLOSED' AND ticket.t_id = events.t_id";
$jobresult2 = mysql_query($queryjobs2, $mysql_link) or die("query failed, "
.
mysql_error());
Which brings up a list of closed tickets.
I then want to compare these to each other to print only the open tickets:
<? if ($jobresult1) {
//if there are jobs for the user
print "<b>Your unresolved ticket(-s)</b>";
print "<table>";
//build a table to show them
print "<tr
bgcolor='lightGray'><td>Ticket</td><td>Client</td><td>Task</td></tr>";
while($summary=mysql_fetch_row($jobresult1)) {
//while there are
//open tickets
$ticket = $summary[0];
//get a list of
//openedt
// tickets.
$client = $summary[1];
$work = $summary[2];
echo - $ticket;
//debug line - prints "- ticket_ID"
while($summary2=mysql_fetch_row($jobresult2)) {
// get list of closed
//tickets
// now circle through a list of closed tickets
$ticketclosed = $summary2[0];
echo $ticketclosed;
// debug line prints "ticket_ID"
if ($ticket <> $ticketclosed) {
//as
//long as we don't get a match
// we're
//looking for open tickets not closed.
print
"<tr><td>$ticket</td><td>$client</td><td>$work</td></td>";
//print the ticket
}
}
}
print "</table>";
}
?>
This print (with one open and one closed ticket) -11-2 (se above) but the
second compare fails as open ticket 2 isn't compared to anything and won't
print. How do I put in a "catch empty string" statement. It should be
fairly
simple but it escapes me right now.
Any suggestions?
M.