I have a perl program in which I need to fork a child process to do something else. In both the parent process and the child process, there are database interactions. I have a perl module in which the database connection is initiallized. But I don't have disconnection in the same module. I rely on the calling programm to automatically disconnect when the calling program terminates. It works perfect without child process. But with a child process created in the middle of the perl program and exits before the parent process. I have trouble with the database connections. As when the child process terminates, it seems disconnect the database handler therefore the parent process isn't able to continue its job with the database. Here is the program: 
--------------------------- mail program --------------
myquery ('3933'); #this is parent process
        
$| = 1; # turn off buffering
$newpid = fork();
if ( not defined $newpid ){
     # if return value of fork() is undef, something went wrong
     die "fork didn't work: $!\n";
}
elsif ( $newpid == 0 ){
     # This is what the child process does
     print "inside child---------\n";
     myquery ('3934');    
     exit( 0 );

}
    
myquery ('3932');

----------------one subroutine---------------------
sub myquery {
    
    my ($target_member_id) = @_;
    my ($query) = "select username from member where id=$target_member
+_id";
    my ($sth) = $mypackage::dbh->prepare ($query);
    $sth-> execute;
    my ($row) = $sth->fetchrow_array;
    if($row) {
        print "row: $row\n";
    }
    else {
        print "empty\n";
    }
    $sth->finish;
}
 ---------------the perl module to establish the db connection ------
package mypackage;
use DBI;

$dbh = DBI->connect("$DB_SERVER:$DB_NAME;$DB_HOST",$DB_USERNAME,$DB_PA
+SSWORD) || die "Content-type: text/html\n\nCan't connect to 
$dbname: $DBI::errstr\n";
...
...

[download]
Thanks.

In reply to Access the same database in two processes by sachaer

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