perl多线程实例（四个线程同时读MYSQL数据库获取记录）

use threads;
use DBI();


# input:
# $_[0]: fruitname
sub fetchFruit {
     # Connect to the database.
    my $dbh = DBI->connect("DBI:mysql:database=FruitDB;host=localhost","username","password",{'RaiseError' => 1});
     
     # Now retrieve data from the table.
    my $sth = $dbh->prepare("SELECT * FROM fruit where name = '".$_[0]."'");
    $sth->execute();
    while (my $ref = $sth->fetchrow_hashref()) {
       print "Found a row: name = $ref->{'name'},variety = $ref->{'variety'}n";
    }
    $sth->finish();


    # Disconnect from the database.
    $dbh->disconnect();
}


my @arr = qw(APPLE ORANGE PEAR BANANA);
my @threads;
foreach (@arr) {
   push @threads,threads->new(&;fetchFruit,$_);
}
foreach (@threads) {
   $_->join();
}