I have a database which contains mobile numbers. How do I write perl script which get all of numbers into array & check new number already exist or not in that array?

Create Table:**

    CREATE TABLE consumeruser (
      ConsumerId    int(10) NOT NULL AUTO_INCREMENT,
      ConsumerName  varchar(45) DEFAULT NULL,
      ConsumerMobNo varchar(10) DEFAULT NULL,
      PRIMARY KEY (ConsumerId)
    ) ENGINE=InnoDB AUTO_INCREMENT=4494 DEFAULT CHARSET=latin1
[download]

        #!/usr/bin/perl -w

         use strict;
         use DBI;
         use warnings qw(all);
         use Getopt::Long;
         use Pod::Usage;
         use Text::CSV_XS;



         my $username = 'root'; # set your MySQL username
         my $password = 'xxxx'; # set your MySQL password
         my $database = 'app'; # set your MySQL database name 
         my $server = 'localhost'; # set your server hostname (probabl
+y localhost)

         my $dbh = DBI->connect("DBI:mysql:$database;host=$server", $u
+sername, $password)
        || die "Could not connect to database: $DBI::errstr";
          
         my $CustomerMobileNumber = 9999999;
         my @MobileNumbers;
         my $mobileNumberQuery = "select ConsumerMobNo from consumerus
+er";
         my $sth = $dbh->prepare($mobileNumberQuery);
         $sth->execute();
         while(my @row = $sth->fetchrow_array()){
          push @MobileNumbers, $row;

        if (present){
          9999999 found in array;
         }
        else{
         9999999 not found in array;
         }
        }
[download]