sarthakganguly
Novice
Jul 25, 2009, 11:34 PM
Post #1 of 5
(3423 views)
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SELECT Finding if result returned is 0
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Hi,
I have the following script for fetching some data from mySql DB.
my $query_select_groups="SELECT GROUPS.group_id,GROUPS.article_id FROM GROUPS WHERE group_id = (SELECT DISTINCT GROUPS.group_id FROM GROUPS LIMIT 1) AND flag=0";
my $query_select_groups_handle = $connection->prepare($query_select_groups);
$query_select_groups_handle->execute() or die "Error in fetching data";
query_select_groups_handle->bind_columns(\$group_id,\$article_id);
while($query_select_groups_handle->fetch()){
print "group id $group_id \n ";
print "article id $article_id \n";
push(@articles,$article_id);
}
If the query returns 0 rows I want the program to sleep for 30 secs and try again.
q1)How to find if the query is returning 0 or not? Is this going to help ....?
if($query_select_groups_handle->{NUM_OF_FIELDS} eq 0){
goToSleep();
}
q2)If some error occurs I dont want the program to die..I want it to log and go to sleep. For dat instead of
$query_select_groups_handle->execute() or die "Error in fetching data";
what can I use?
Please suggest me some solutions...
Thanks in Advance
Thanking you
regards
Sarthak
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